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Site Development
Foundations
© 2004 ProsoftTraining
All rights reserved
Copyright © 2004 ProsoftTraining, All Rights Reserved.
Lesson 1:
Introduction to
Web Site Development
Copyright © 2004 ProsoftTraining, All Rights Reserved.
Objectives
• Distinguish between using a text editor and
using a GUI markup language editor
• Identify Web page design issues
• Identify the standards organization that
controls markup languages
• Identify front-end and back-end Web issues
• Define the concepts of creative design and
branding standards, and demonstrate their
importance to business
Creating Web Pages
• The need for skills in Web-based technologies:
– Contribute to team projects
– Create Web pages
– Create résumés
• You must know at least the following markup
languages:
– Hypertext Markup Language (HTML)
– Extensible HTML (XHTML)
Additional Web Page Elements
• Web pages use more than HTML or XHTML -additional technologies include:
– Flash
– Java
– ActiveX
• You must also understand how Web pages
use:
– Databases
– Common Gateway Interface (CGI)
Databases and Web Pages
• Databases can store information about
company inventory
• Databases can store customer information
Web Pages and CGI
• CGI is used for many purposes:
– To help Web pages pass information to and
from databases
– To provide active content (e.g., hit counters)
– To provide dynamic content
• Examples of CGI technology include:
– Perl
– PHP Hypertext Preprocessor (PHP)
– Active Server Pages (ASP) and .NET
– JavaServer Pages (JSP)
– Server-Side JavaScript (SSJS)
– ColdFusion
Text Editors and
Markup Languages
• You do not need to use a special editor
application to create markup
– You can use a simple text editor (e.g.,
Notepad or Vi)
• When creating HTML or XHTML files, you
must:
– Save the text as plaintext
– Save the file using either the .html or .htm
file name extension
Graphical User Interface (GUI)
HTML Editors
• GUI HTML editors:
– Create HTML/XHTML code for you
• You type page text as you would with a
standard word processor
• You point and click with a mouse
• Popular GUI HTML editors include:
– Macromedia DreamWeaver
– Microsoft FrontPage
– Mozilla/Netscape Composer
Why Learn
Markup Languages?
• GUI HTML editors do not keep pace with the
latest improvements in markup language
• You can add features to pages not supported
by the editor
• You will not be limited by the GUI editor’s
capabilities
Front-End Issues
• A Web page is an interface that should:
– Provide a distinct message
– Be accessible by all users
– Incorporate appealing images and graphical elements
– Include constantly updated hyperlinks
– Use tables wisely
– Present carefully designed Web forms
– Connect pages to databases securely
– Use the most current technologies appropriate
– Use images sparingly
– Be easily navigable and without dead ends
– Include alternative navigation
Web Page Accessibility
• An accessible Web page has:
– A user-friendly and accessible front end
– Back-end server resources that process and store user
input
• The WC3 estimates that up to 10 percent of people have
disabilities that, if not accommodated by Web sites, can
cause companies to lose significant amounts of revenue
• Why adhere to accessibility standards?
– It makes your site available to all users
– You can be penalized for failing to provide accessibility,
either by losing customers or through governmentimposed fines
Disabilities Acts
• The Americans with Disabilities Act (ADA)
– Enforced by the U.S. Justice Department
– Requires Web designers to create “reasonable
accommodations” for disabled users:
• Ensuring that all images have text-based descriptions
• Providing text-based alternatives to all non-text
content (e.g., Java applets and Flash presentations)
• Providing easy-to-read forms
• Additional disabilities acts and initiatives:
– Canada’s Common Look and Feel for the Internet
– The Australian Government’s Guide to Minimum Web Site
Standards – Accessibility
– India’s Maharashtra Right to Information Act
Disabilities Acts
(cont’d)
• Web Content Accessibility Guidelines (WCAG)
– Provided by the W3C Web Accessibility
Initiative (WAI)
– A product of worldwide cooperation
– 14 WAI guidelines
• Rehabilitation Act: Electronic and Information
Technology Accessibility Standards, Section 508
– Known simply as Section 508
– All federal agencies must ensure that all
electronic and information technology
developed, procured, maintained or used by
federal agencies be comparably accessible to
users with disabilities
– Based on the WCAG
Child Online Protection Act
(COPA)
• Designed to protect minors from harmful
material
– U.S. government law
– Penalties specified
– You can learn more about COPA at:
• The COPA Commission Home Page
www.copacommission.org
• The COPA Act Text
www.copacommission.org/commission/original.s
html
Verifying Web Page Accessibility
• Many tools available, including:
– Bobby (www.cast.org/bobby)
– STEP508 (www.section508.gov)
– RetroAccess (www.retroaccess.com)
• One way you can help improve accessibility is
by adhering to the XHTML 1.0 standard when
you write Web page code
General Web Page Accessibility
Considerations
• Visual challenges
– Text readability
– Text support for images
– Screen reader support
• Audio challenges
– Alternative audio support
– Alternative speech input
– Text support for audio elements
• Cognitive and technical challenges
• Site maps can improve accessibility
• Change documentation can improve accessibility
Creative Design and Branding
Standards
• A Web page is often part of a larger marketing and
sales strategy
– Creating and ensuring brand recognition (name
recognition)
– Presenting a strong message
• A Web page allows you to develop:
– A market
– Mind share
– A brand
Creative Design and Branding
Standards
• Design and branding standards – topics for meetings
include:
– Target markets
– Market messages
– Media choices
– Color combinations
– Sales strategies
– Technologies to use
• Audience development techniques include:
– Flash, Java
– Company logos
– Strategies developed by sales and marketing
– Push and pull technologies
– Visitor tracking
Portals
• A Web site that act as a centralized access point
for additional Web sites
– Portal types:
• Vertical
• Horizontal
• Portal benefits:
– Direct users to the best sites
– Attract users to products
– Improve brand name
Wiki Site
• A Web site that allows all visitors to collaborate in
its construction
– Wiki software is installed on a Web server
– You can lock down certain pages and leave
others open to editing
• Wiki examples
– Wikipedia (www.wikipedia.org)
– LinuxQuestions.org
(http://wiki.linuxquestions.org/wiki/Main_Page)
– MemoryAlpha
(http://en.wikipedia.org/wiki/Memory_Alpha)
• Wiki software purveyors
– Open Wiki (www.openwiki.com)
– JSP Wiki (www.jspwiki.org)
File Formats and Active Content
• Your pages will include various content formats,
including PDF documents, images and media files
• Common file formats and MIME types
– HTML: text/html
– JPEG: image/jpeg
– Cascading Style Sheets (CSS): text/css
– MPEG: audio/mpeg
– MP3: audio/mp3
• Evaluating proprietary formats
– Difficulty/inconvenience
– Cost
– Audience limitation
Back-End Issues
• Database connectivity
– Types of databases
– Web servers use relational databases to
store data
• Relational databases
– Creating relational databases
– Relational database vendors
– Databases, Web servers and SQL
Relational Database Manipulation
Terminology
• Join -- combining two database tables to create a new table
• Table -- a database topic that contains rows (records) and
columns (attributes or fields)
• Record -- one row of a relational database table
• Field -- one column of a relational database table
• Entity (i.e., record) -- a person, place or thing represented in a
database table row
• Attribute -- a category of information related to an entity
• Linking attribute -- common attribute between tables that
allows a join to occur
• Relation -- a link generated between two entities
• Tuple -- two or more entities currently linked by a relation
• Query -- searching a database
Types of
Database Table Joins
• Inner join
– Results in a new table in which the information in
one column of the first table is combined with a
column of the second table
– The most common type of join
• Outer join
– Used to combine tables when one column of a
table contains an empty, or null, value
– Less common
SQL Commands
• SELECT — requests data from a particular table or
table row
• FROM — delimits the beginning search point in a
table or table row
• WHERE — delimits the ending search point in a
table or table row
• JOIN — creates a new table from selected data
• SUM — adds numerical information within records
Accessing and Updating
Databases
• Ways to access databases include:
– Locally
– Over the LAN from a share you establish
– Via the Web through a Web application
• Database connectivity methods
– Open Database Connectivity (ODBC)
– Java Database Connectivity (JDBC)
• Indexing and cataloging
Bandwidth and Download Time
• Download time
– Factor in all files
– Consider typical connection speeds
• Calculate download time for a Web page
– Check the size of the HTML file and all associated
images, files or programs
– Determine the speed of your network connection
– Convert the connection speed and file size to common
units of measure (e.g., bytes or bits)
– Divide file size by connection speed
Naming Web Page Files
• Web servers search for default page names
• Default page names include:
– index.html
– index.htm
– default.htm
– default.asp
• Default page names can change from server to
server
– Apache Server -- usually index.html
– IIS -- usually default.htm, default.html or
index.html
HTTP 404 – File Not Found Error
• Indicates that a user has requested a file that does
not exist on the specified Web server
– Generated by the server
– Can be customized
Habitat For Humanity
Web Site
• A not-for-profit, volunteer-driven organization that
builds and sells homes for families worldwide
• Has built more than 150,000 homes worldwide
• A Web site example in this course
• Like any Web site, it targets an audience
– The site is part of a concerted effort to bring in
volunteers
– People with technical expertise must run the site
– More than technical expertise is required –
The Web design team must also understand the
business goals
Lesson 2:
Markup Language and Site
Development Essentials
Copyright © 2004 ProsoftTraining, All Rights Reserved.
Objectives
•
•
•
•
•
Discuss the history of markup languages
Distinguish between HTML and XHTML
Identify HTML and XHTML flavors
Explain the value of universal markup
Demonstrate knowledge of site management
principles
• Plan Web site development
History of Markup Languages
• Standard Generalized Markup Language
(SGML)
– Originally created by IBM in 1986
– A metalanguage, meaning it is used to
create other languages
– The basis for HTML, XHTML and XML
– You create your own document rules using
a Document Type Definition (DTD)
History of
Markup Languages
(cont’d)
• Hypertext Markup Language (HTML)
– Though based on SGML, invented by Tim Berners-Lee
– Allows hyperlinks
– HTML vs. SGML
• HTML versions include:
– HTML 3.2
– HTML 4.01 (the most popular version of HTML)
• HTML 4.0 flavors include:
– 4.01 Transitional -- allows deprecated tags, not as strict
– 4.01 Strict -- requires all container tags and no allows
deprecated tags
– 4.01 Frameset -- for use with frames
History of
Markup Languages
(cont’d)
• Extensible Markup Language (XML)
– XML describes data instead of formatting
– HTML or XHTML provides formatting and
document structure
– A subset SGML, also a metalanguage
• XML documents have a tree structure
• XML documents must be well-formed
• XML and valid documents: the DTD
• XML and style sheets
• From HTML to XML
Universal Markup Creation
• Follow W3C standards
• Benefits of following standards include:
– Code will render as expected in more
browsers
– Pages will be more scalable (as you add
more sophisticated content, you will not
run into problems)
– Pages are more likely to be available to
disabled users
Web Site
Development Principles
• Project management and the Web development
project cycle
– Create and document an initial Web site plan
– Obtain relevant input from stakeholders
– Communicate the Web site plan
– Consider technical and non-technical concerns
– Develop the site
– Publish the site
– Manage the site
Creating and Documenting
an Initial Web Site Plan
• Site plan is a rough outline of planned development
– Site diagram
– Storyboard
• Eventually becomes a site map for completed site
• Determining audience and message
• Validating design issues
– Consider issues such as central message, fonts,
images, colors, ethnic and cultural diversity, and
common color schemes
Obtaining Relevant Input
from Stakeholders
• Stakeholders are relevant organization employees or
contributors who can provide or help determine:
– The purpose of the Web site
– The services that the audience requires from the site
– Development timelines
• As you work with stakeholders:
– Remember that non-technical people may be asked to
approve your project
– You must translate technical issues into non-technical
language
• Team members can include representatives from marketing,
IT, sales and other areas of your organization
Documenting and
Communicating the Plan
• Create a storyboard
• Document decisions in meetings and follow up
• Communicate the plan in various ways:
– Calling relevant parties to ensure that everyone
is satisfied
– Sending e-mail messages
– Sending postal (“snail mail”) messages if
necessary
– Sending fax messages
– Telephone calls
Communicating the Plan
• Use oral presentations and presentation aids,
including:
– Presentation software
– Overhead projection
– Whiteboards
– Easel and poster paper
– Charts
– Published handouts
Leading Discussions
• Strategies leaders use to manage a meeting:
– Make introductions
– Recall past business
– Create a list of action items, including
timelines
– Monitor time
– Ensure proper discussion focus
– Handle heated discussions
– Distribute minutes
Considering Technical and NonTechnical Issues
• Leaders can ensure communication by:
– Regularly asking if anyone has questions
– Asking team members to summarize their
understanding of decisions
– Asking a third party to deliver a summary of
progress
– Writing regular updates about the project
Developing the Site
• As your team develops the site, you will be
engaged in various activities:
– Creating markup code
– Testing functionality
– Approving the site
– Publishing the site
Testing Pages in
Multiple Browsers
• As you develop Web pages, test them using
multiple Web browsers
• Different generation of the same browser may
interpret HTML somewhat differently
• Browser vendors also implement standards
differently
• Browser types include:
– Microsoft Internet Explorer
– Netscape/Mozilla
– Lynx
– Opera
Publishing the Site
• To publish a site, you need to know:
– The IP address and/or DNS name of the site
– User name and authentication information
– The destination directory (i.e., folder) on the
Web server
– Space requirements
– The protocol you will use to upload the site
• Working with service providers
Managing the Site
• When managing a site, you must be prepared
to:
– Create new content
– Update dead links
– Remove old sites
– Remove unused pages
– Ensure connectivity
– Report access troubles
– Process feedback from customers and
stakeholders
Obtaining Feedback
• Your Web team must process various types of
feedback
• Feedback can come from various sources
• Ways to obtain quality feedback
– Providing Web forms on the site that ask
for customer input
– Conducting surveys in person
– Conducting surveys via e-mail
Intellectual Property
• A unique product or idea created by an individual or
organization
– Generally has commercial value
• Never “borrow” content without express, written consent
• Review copyright and trademark issues (e.g., trade secrets,
licensing, infringement, plagiarism)
• Understand copyright scope, reach and time limits
• Consider ethical issues of copyright, trademark and
plagiarism
• Avoid copyright infringement, trademark infringement and
plagiarism by:
– Reviewing content
– Obtaining express, written consent
– Creating reasonable deadlines
Outsourcing
• Increasingly, Web development work (including
site design) is being outsourced to workers in
remote locations
– May save the company money
– May require you to work with remote workers
• As you use and work with remote teams, you may
have to obtain:
– Non-Disclosure Agreements (NDAs)
– Legal consultation
Lesson 3:
XHTML Coding
Copyright © 2004 ProsoftTraining, All Rights Reserved.
Objectives
• Demonstrate knowledge of basic XHTML
document structure
• Identify XHTML document structure tags,
including the <meta> tag and the <!DOCTYPE>
tag
• Create XHTML that validates properly
• Format paragraphs and text with XHTML tags
• Use comments and good coding practices
Markup Tags
• Markup tags are element names enclosed in
angle brackets, or wickets < >
– Tags are key to markup files
– Tags embed the markup element
information in the document so that a user
agent (e.g., browser) will render text as
instructed by the associated element
– The combination of markup tags and
standard text is loosely referred to as either
“code” or “markup”
Container Tags
• Two types of tags: container and empty
• Container tags contain page text between an
opening and a closing tag, as shown
• Container tags are also known as non-empty tags
• XHTML requires the use of container or non-empty
tags
Empty Tags
• An empty tag does not use a closing tag
• Used in HTML only, Transitional or Frameset flavor
• Never used in XHTML; code will not validate if you
use empty tags
Alternative Non-Empty Tag
• HTML and XHTML allow alternative notation for
stand-alone non-empty tags
• Place the slash ( / ) after the element name (before
the closing wicket), rather than before the element
name like in a standard closing tag:
</title> My Home Page
• All XHTML tags must be closed (using either a pair
of container tags or the stand-alone non-empty
tag)
What Constitutes a Tag?
• An element
• An attribute
• A value
Document Structure Tags
• Every XHTML document must have the following
document structure components to render as
expected and validate:
– A <!DOCTYPE> tag
– An <html> tag
– A <head> tag
– Any <meta> tags
– A <link> tag reference to a style sheet
(recommended)
– A <title> tag
– A <body> tag
Document Structure Tags
(cont’d)
Are XHTML Tags
Case-Sensitive?
• XHTML tags are case-sensitive and should
always be typed in lowercase letters
• By contrast, HTML tags are not case-sensitive
Document Type Declaration
(DOCTYPE)
• An SGML statement that describes the nature
of your code
• Placed at the top of the document using the
<!DOCTYPE> tag
• If you do not specify a DOCTYPE, then two
problems may arise:
– You will not be able to control how your
code renders in the future
– You will not be able to use a markup
validator
• Each version and flavor of HTML/XHTML has
its own DOCTYPE
The <html> and <head> Tags
• The <html> </html> tags encompass all other
HTML or XHTML elements in the document
– Takes various attributes
• The <head> </head> tags encompass several
document elements, including:
– The <meta> tag
– The <link> tag that references a CSS file, if
present
– The <title> tag
The <body> tag
• All content to be displayed on the page
through the user agent must be enclosed
between the <body> </body> tags
– <body> takes many attributes, including:
• bgcolor
• background
• link
– Values accompany attributes, and must be
enclosed in quotation marks in XHTML
Web Site File Structure
• When creating a Web
page, you must consider
the site’s file
structure
• Your XHTML/HTML
and image files will
be uploaded to a
server eventually, so
it is always
good practice to
organize
your files
Preparing Your
Development Environment
• Obtain a text editor
• Install multiple browsers
• Set file preferences
Cascading Style Sheets (CSS)
• A technology that adds formatting and
structure to your pages
• A style sheet is simple text file that contains
instructions
• If all pages on your site are linked to the same
style sheet, then one simple change to the
style sheet will change all specified elements
across the site
• Strict flavors of HTML and XHTML require that
you use style sheets
CSS Terminology
•
•
•
•
•
Proper CSS structure
Inheritance
CSS and XHTML
Benefits of using CSS
Style sheets and compatibility
Paragraph Formatting and BlockLevel Elements
• Block-level markup elements
– Affect entire paragraphs or multiple
paragraphs
• The <p> tag
• The <br/> tag
• Text-level markup elements
– Elements that can affect as little as a single
character or word
• <bold> or <strong>
• <i> or <em>
Heading Levels
• Block-level element
• Heading levels 1
through 6
– <h1> </h1>
– <h2> </h2>
– <h3> </h3>
– <h4> </h4>
– <h5> </h5>
– <h6> </h6>
Tag Nesting in Markup
• Placing one pair of tags between another
– Proper: <h1><i> ... </i></h1>
– Improper: <h1><i> ... </h1></i>
• Improper: The <i> tag is opened within the
<h1> tags, but closed after the </h1> tag
• If you fail to properly nest code, your pages
may still render in some user agents, but
they will not validate and may fail to render in
the future
Primitive Formatting with the
<pre> Tag
• The <pre> tag retains formatting on
preformatted text
• Can be used to retain tabular format, fonts,
etc.
• All text between <pre> </pre> tags will render
as formatted in the HTML file
Indenting and Centering Text
• The <div> tag
• Alternatively, use <p align=“center”> </p>
• The <blockquote> tag can also be used to
indent (but not center) text
Text-Level Elements
• Bold, italic and underlined text
• Bold:
– <b> and <strong>
• Italic:
– <i> and <em>
Font Style Elements
vs. Phrase Elements
• The <b> element is a font style element, <strong> is a
phrase element; both create boldface text
• The same is true of <i> and <em>, respectively, which
both create italic or emphasized text
• The difference is that <b> specifically means apply the
bold font style, whereas <strong> indicates that the text
is to be given a strong appearance
• In short, <b> represents a font appearance instruction,
whereas <strong> represents the weighting of the
phrase relative to surrounding text
The <code>,
<kbd> and <samp> Tags
• All make text appear in a fixed-width font in an
HTML 4.0-compliant browser window
• Available to both HTML 4.0 and XHTML
Lists
• Two types of lists:
• Ordered
– A numbered list
– Uses the <ol> element and requires a
closing tag </ol>
• Unordered
– A bulleted list
– Uses the <ul> element and requires a
closing tag </ul>
Lists
(cont’d)
• Ordered list code:
<h2>Ordered List</h2>
<ol>
<li>This is the first numbered item.</li>
<li>This is the second numbered item.</li>
<li>This is the last numbered item.</li>
</ol>
• Unordered list code:
<h2>Unordered List</h2>
<ul>
<li/>This is the first bulleted item.
<li/>This is the second bulleted item.
<li/>This is the last bulleted item.
</ul>
Good Coding Practice
• Create code that can be easily read by others
• Exceptions:
– Some code might encounter problems if it
includes random spaces
– Always test your code in multiple browsers and
validate it
• Adding hidden comments:
<!-- Text inside of these brackets will not appear -->
• Use comments to annotate code or document
changes
Lesson 4:
Horizontal Rules and
Graphical Elements
Copyright © 2004 ProsoftTraining, All Rights Reserved.
Objectives
• Add horizontal rules to your pages
• Incorporate image files as stand-alone
graphics
• Use the Web-safe color palette
• Use colors and tiled images for page
backgrounds
• Add special characters to XHTML pages
• Structure your XHTML document using the
<div> tag and CSS
Horizontal Rules in XHTML
• Create a horizontal rule using the <hr> tag:
– <h1>Horizontal Rules</h1>
<hr/>
Horizontal rules: Lines used to make visual divisions in your document.
• Horizontal rule attributes
Images in Web Pages
• Use the <img> tag to insert an image file using
either of two formats to close the tag:
– <img src="imagefile.gif"> </img>
– <img src="imagefile.gif"/>
• Image file formats
– Graphics Interchange Format (GIF)
– Joint Photographic Experts Group (JPEG)
– Portable Network Graphics (PNG)
Comparing Image File Formats
Format
Transparency
Interlacing
Compression
Animation
GIF
Yes
Yes
Yes
Yes
JPEG
(standard)
No
No
Yes
No
PNG
Yes
Yes
Yes
Yes
Images and the alt Attribute
• In XHTML, every image must follow good
coding practice by including the alt attribute
with a corresponding value
• Code will not validate as XHTML without this
attribute
• Browsers and screen-reader technology can
read alt description and render it in audio for
disabled users
– <img src="image.gif" alt=“Alternative
text"/>
Combining Background
Images and Colors
• The bgcolor attribute:
– Specifies background colors
• The background attribute:
– Inserts an image as a background
• If you use both the bgcolor and background
attributes in a <body> tag, then only the
attribute specified last in the tag will render
Aligning Images
Relative to Text
• The align attribute positions images relative to text
<img src="imagefile.gif" align="alignment value">
• Values include:
– “bottom”
– “middle”
– “top”
– “left”
– “right”
• The align attribute has been deprecated in favor of
style sheets, but can still be used; code will still
validate as XHTML 1.0 Transitional
Resizing Images
• Specify image size using the following attributes:
– height
– width
• The syntax for these attributes is:
<img src="imagename.gif"
height=“NumberOfPixels“
width=“NumberOfPixels"/>
• Specifying both height and width can distort an
image; be sure to use proper proportions
Special Characters
• Uses code with ampersand (&) and semicolon (;)
• Special characters include:
– The “less than” symbol <
• Code: &lt;
– The “greater than” symbol >
• Code: &gt;
– The copyright sign ©
• Code: &copy; or &#169;
– The registered trademark sign ®
• Code: &reg; or &#174;
– The United Kingdom pound sterling sign: £
• Code: &#163;
• Non-breaking space: &nbsp;
Specifying Colors
• Colors can be specified by name or by
Hexadecimal “Red Green Blue (RGB)” value
Web-Safe Color Palette
• A set of 216 colors guaranteed to render
properly
• Ensures that colors in pages render as
expected
– If you specify a color not supported by the
monitor or operating system, the system
will approximate the color, a process called
dithering
– Unexpected results may occur as the result
of dithering
Page Colors and Backgrounds
• Specifying page colors:
<body bgcolor="colorNameOrCode">
• Specifying text color on the page:
– <body text="colorNameOrCode">
• Specifying color of unvisited links:
– <body alink="colorNameOrCode">
• Specifying color of visited links:
– <body vlink="colorNameOrCode">
• Providing a background image:
– <body background=“image.png">
Specifying Font Information
• You can use the <font> tag
– The size attribute: specify value “1”
through “7”
– The face attribute: specify font type (e.g.,
Arial, Times New Roman)
<font size="7" color="#993399"
face="arial">
• The <font> tag is deprecated
• The W3C recommends to use style sheets
instead
Web Design Issues
• Color combinations
– Popular color combinations
• Consider existing sites
– Habitat for Humanity (www.habitat.org)
– Microsoft (www.microsoft.com)
– Red Hat (www.redhat.com)
• Cultural and audience concerns
– Page layout
• Layout guidelines
• Document structure, the <div> tag and style
sheets
• Relative path names
• White space, the <img> tag and XHTML
Lesson 5:
Hyperlinks
Copyright © 2004 ProsoftTraining, All Rights Reserved.
Objectives
•
•
•
•
•
Reference full and partial URLs
Specify alternative protocols
Create hyperlinks for text and images
Link to local files and remote sites
Create an internal anchor within a file and link
to it
The Anchor Tag
• The <a> tag creates hyperlinks
• A container tag that encompasses the text or
image (or both) to be used as a link
• The syntax for using the anchor tag to create a
link is as follows:
<a href="URL"> linked text or image (or both)
</a>
The Anchor Tag
(cont’d)
• A fully qualified URL specifies an entire path
• A partial URL assumes a path relative to the file’s current
location
Type of
Reference
Description
Examples
Fully qualified
URL (also
called
absolute URL)
A URL (i.e., URI) that
contains a full path to
a resource, including
the protocol
indicator. Also known
as a hard link.
http://www.someserver.com/somepage.html
or
http://someserver.com/pub/~james/somefile.ext
or
c:\intetpub\wwwroot\ccyp\syb\syb.html
Partial URL
(also called
relative URL)
A URL that assumes
the current
document’s path. All
references are made
from the document’s
current directory.
syb.html: Specifies a file in the current
directory
../css/stylesheet.css: Specifies a file one
directory up from the current page
pub/images/mybullet.gif: Specifies a file
in a subdirectory
The Anchor Tag
(cont’d)
• You can specify various protocols
Protocol
Hyperlink HTML Example
HTTP
Visit the <a href=”http://www.ciwcertified.com”>CIW<a/>
site.
HTTPS
(Secure
HTTP)
Visit our <a href=”https://www.ciwcertified.com”>secure
CIW<a/> site.
FTP
Download the file from our <a
href=”ftp://ftp.server.com”>FTP server.</a>
E-mail
You can send e-mail to us at <a
href=”mailto:[email protected]”>
[email protected]</a>.
Telnet
Please visit our <a href="telnet:melvyl.ucr.edu">Telnet
server.</a>
The Anchor Tag
(cont’d)
• Make sure that you:
– Use a closing anchor tag </a>
– Place quotation marks around the value
– Include the closing bracket at the end of the
opening <a> tag
• Various issues to troubleshoot with hyperlinks
– Text and images disappear
– All successive Web page text is a hyperlink
– Garbled code appears on screen
– Code will not validate due to a problem <a> tag
The Anchor Tag
(cont’d)
•
•
•
•
Creating local hyperlinks
Creating external hyperlinks
Using images as hyperlinks
Creating internal links
– On a long page, a link to another point lower on
the page
– Internal links require internal bookmarks
• Example:
<a name="targetArea1">
target anchor text or image (or both)
</a>
… other page content here …
<a href="#targetArea1"> text/images linking to targetArea1 </a>
Accessing an External File's
Internal Link
• Link to a specific point in another page
without first accessing the top of that page
• To link to an internal anchor inside of another
file, use the following syntax:
<a href="URL/filename.ext#AnchorName">link
text/image</a>
Managing Hyperlinks
• All hyperlinks need to be verified
– Verify that the URL or other reference is valid
– Verify that the target page or location is accessed
• Hyperlinks also need to be managed
– Over time, URLs (and content) change
– “Dead” links frustrate users
• Manually check links
• Automatic link-checking software:
– Linklint (www.linklint.org)
– Link Controller (http://freshmeat.net/projects/linkcont)
– Checkbot (http://degraaff.org/checkbot)
– Link should still be reviewed manually to verify relevance
of linked content
Lesson 6:
Tables
Copyright © 2004 ProsoftTraining, All Rights Reserved.
Objectives
• Create simple and complex tables in HTML
and XHTML
• Add or remove table border lines
• Format table rows and cells using attributes
• Use tables when appropriate
Introduction to Tables
• Present data that lends itself to tabular format
• In XHTML, do not use to structure entire pages
• Offers many formatting options
Table Elements
Element
Tag
Description
Table
<table>…</table>
Required to create a table;
contains all other table
elements.
Table caption
<caption>…</caption>
Optional; adds a caption or
title, which appear above
the table by default.
Table row
<tr>…</tr>
Required; contains all data
for a table row.
Table header
<th>…</th>
Table data
<td>…</td>
Optional; typically
designates the top row or
left column. By default, text
in a header cell will appear
bold and centered.
Required, unless <th> is
being used; designates table
cell contents.
<table> Tag
• Table tag creates the table structure
• <table> </table> encloses all other table
elements
• Attributes include:
– align
– border
– cellpadding
– cellspacing
– width
– summary
<tr> Tag
• Table row tag creates a row within a table
• Attributes include:
– align
– valign
– bgcolor
– style
<td> Tag
• Table data tag designates table cell contents
• Attributes include:
– align
– valign
– colspan
– rowspan
– bgcolor
– height
– width
Differences between
HTML and XHTML Tables
• The align attribute for the <table> tag is
deprecated in HTML 4.01
• The align attribute for the <table> tag is
deprecated in XHTML 1.0 Transitional 1.0
• The bgcolor attribute has also been
deprecated
Table and Data
Alignment Options
• Defaults for table data:
– Content in table header cells is aligned both
horizontally and vertically to the center of the
cell
– Content in table data cells is aligned
horizontally to the left and vertically to the
center
• You can customize these defaults by using:
valign=“top”
This will make text appear in the top of a cell
or row
Working with Table Data
• Changing height and width of table elements
• Column and row spanning
• Formatting content in tables
Lesson 7:
Web Forms
Copyright © 2004 ProsoftTraining, All Rights Reserved.
Objectives
• Identify Web form elements for HTML and
XHTML
• Construct a Web form
• Test Web forms using a public test engine
Introduction to Web Forms
• Forms are used to obtain information from
users
– Input can include the user’s name, address
or credit card number, for example
– The information that a user submits in the
form is sent to a server, where it is stored
and/or processed
• Forms are essential for e-commerce, as well
as for gathering information
Web Forms and CGI
• To be truly functional, a form requires the use of a
Common Gateway Interface (CGI) program to
process and organize the user input
• A CGI script residing on a server performs two
important functions:
– Receives data from a Web browser
– Processes and formats the data
• CGI scripts can also be used to forward data to the
proper destination, where it can be processed or
stored
Diagramming a CGI Session
Parsing Data
• A Web form receives submitted user input
• CGI scripting (or an alternative) parses the data
• The browser sends user-submitted information to
the Web server as a raw text string
• The basic element of a raw text string is a
name=value pair
• This raw text string consists of name=value pairs,
delimited by ampersands (&)
• After the server receives this information, a CGI
script can parse and format the raw text string into
a human-readable format, or enter the data into a
database
Applied Example: FormMail
• FormMail details:
– Written by Matt Wright
– Extremely popular
– Used to e-mail information gathered from
forms to a destination you specify
– You install the script onto a Web server and
refer to it in your forms
• Security concerns
• Other versions of FormMail
The <form> Tag
•
•
•
•
The <form> tag creates a user-input Web form
Encompassed all content and form fields
A container tag, requires closing </form> tag
Attributes include:
– method
• “get”: not as secure, sends unencrypted text
• “post”: encrypts, but can be easily broken
– action
• Specifies the name and location of the CGI
script used to process the form
Web Form Fields
• User-input form fields include:
– Text box
– Radio button
– Check box
– Single-option select list
– Multiple-option select list
– Scrolling text area box
– Password field
– File upload button
– Submit and Reset buttons
Forms and the name Attribute
• All form field elements share one attribute:
name
– Identifies information you receive from a
user and associates it with a value you
specify
– Helps organize user input
Password Field
• Created using the password attribute of the
<input> tag
• Specify the size of the textbox using the size
attribute
• Example:
<input type="password" name="Password" size="8" />
• Provides a field that allows password information
to be entered and sent
• Text entered by users masked by asterisks
Text Boxes
• Used to collect a single line of data from the
user, such as name, e-mail or address
information
• Syntax:
<input type="text" name="FieldName"/>
• You can enter default text to appear in the
form:
<input type="text" name="FieldName"
value="DefaultText"/>
In this example, “DefaultText” would appear in the
user’s window
File Upload
• Provides a Browse button and accompanying
text box
• Users click the Browse button and navigate to
the file they want to upload
• The path to the file chosen by the user will
appear in the text box
Choose your file here: <input type="file" name="File"/>
Submit and Reset Buttons
• Submit button
– Sends completed user information from
Web form to server
• Reset button
– Clears all information entered into form
fields, instead of submitting information to
server
• All forms need a means to submit data
<input type="submit" />
<input type="reset"/>
Radio Buttons
• A group of two or more mutually exclusive options
• Never used as stand-alone items
• Example:
Do you know carpentry?
<input type=“radio” name=“Carpentry” value=“yes”
• To present a preselected radio button, add the
following attribute and value:
checked=“checked”
Check Boxes
• A group of non-exclusive choices
• Syntax:
<input type="checkbox"
name="groupName"
Select Lists
• Drop-down lists of predetermined options
• Created with the <select> tag
• Two types:
– Single-option select list
Multiple-option select list
• To allow the user to select multiple options, add the
multiple attribute in the <select> tag
Scrolling Text Area Box
• Created by the <textarea> element
• Provides a scrolling text box into which a user can
enter a few sentences, an address, a letter, etc.
• Used to gather more than one line of text from the
user
• Attributes include:
– cols
– rows
– wrap
• Text between <textarea> tags will appear to users
as default text within the box
Lesson 8:
Image Techniques
Copyright © 2004 ProsoftTraining, All Rights Reserved.
Objectives
• Create client-side image maps
• Define rectangle, circle and polygon areas as
hot spots in an image
• Link defined areas to URLs
• Define image transparency
• Distinguish between GIF 87a and 89a formats
• Define image interlacing
• Identify animated GIF and PNG image formats
Graphic Types
• Vector
– Graphics that use mathematical
coordinates with lines, curves, shapes to
create desired images and specify colors
• Bitmap
– Graphics that use small dots (usually
thousands) to create an image and specify
color
– Also known as raster graphics
Image Maps
• An image that contains hyperlinked, clickable
regions, sometimes called “hot spots”
• Each hot spot is defined by a set of
coordinates (indicating its position on the
image) and a URL reference
• Two types of image maps:
– Client-side (the most common)
– Server-side (rarely used)
Defining a
Client-Side Image Map
• Define a map, assign it a name, and provide
hot-spot coordinates
• Coordinates can be determined using an imageediting application such as Paint Shop Pro
• Refer to the image map by map name:
<map name="mapname" id=”mapname”>
<area shape="shape" coords="coordinates" href="url"/>
<area shape="shape" coords="coordinates" href="url"/>
<area shape="shape" coords="coordinates" href="url"/>
</map>
• Associate the image file with the map:
<img src="imagemap.gif" usemap="#mapname“/>
XHTML and the id Attribute
• In XHTML, the id attribute is required in the
<map> tag
• Serves same purpose as the name attribute
• If the id attribute is omitted, code will not
validate
Defining Hot Spots
• Three shapes for hot spots:
– Rectangle
– Circle
– Polygon
Rectangle Hot Spot
• Any two points can define a rectangle
• Each point is represented by a horizontal (x)
coordinate and a vertical (y) coordinate
• Rectangles are defined by four coordinates
representing the upper-left and bottom-right
corners of the rectangle
– Code:
<area shape=”rect” coords=”1,52,33,96” href=”hand.htm”/>
Circle Hot Spot
• Circles are defined by two coordinates and a
radius
– Code:
<area shape="circle" coords="x1,y1,radius" href="url“/>
• The pair of coordinates specifies
the circle's center
• A third number specifies
the desired radius,
or half-width, of
the circle
Polygon
• Defines an irregular area (neither a circle nor a
rectangle)
• Specify coordinates for each point that defines the
polygon, from three to 100 pairs of coordinates
– Code:
<area shape="polygon" coords="x1,y1,x2,y2,...xn,yn“ href="url" />
Image Transparency
• Provides the visual effect of blending in to the
background of the Web page
• Most developers use image transparency to
remove the blank image background so it
appears to float on the page
• Web-ready formats that support transparency:
– GIF 89a
– PNG
Image with No Transparency
Transparent PNG Image
Image Interlacing
• Allows an image to progressively display in a
browser while downloading
• The image appears in stages during download
(from top to bottom)
• The top of a non-interlaced image will appear after
the browser has read 50 percent of the image
Image Interlacing
(cont’d)
Animation
• Several images in a sequence, rendered in rapid
succession to simulate motion
• Made possible in several ways:
– Animated GIFs and PNGs
• The animated image is actually a group of
separate, sequenced images
– Flash
• Scripts, called macros, that manipulate
vector images
• Popular, but proprietary technology
(Macromedia)
• Requires a browser plug-in to view
Animation
(cont’d)
• Java
– The user agent must have Java plug-in installed
– May not appear as quickly as Flash
• Scalable Vector Graphics (SVG)
– Developed by various vendors, including
Adobe, Macromedia, Microsoft and Sun
– An open standard adopted by the W3C
– Supports:
• Animation
• Compression
• Searchable text
• Zooming
– Requires a plug-in to view
Animation
(cont’d)
• Identifying animation techniques
– Right-click on the animation in the browser and
identify its properties
– View the Web page source code
• Issues with animation
– Frequently overused
– Can limit accessibility
– Often proprietary, requiring a browser plug-in
• Using non-standard images
Lesson 9:
Frames
Copyright © 2004 ProsoftTraining, All Rights Reserved.
Objectives
• Define frames and the purpose of the frameset
document
• Use the <frameset> and <frame> tags
• Identify the purpose of the <noframes> tag
• Target links from one frame to another
• Specify default targets using the <base> tag
• Create borderless frames, and control margins
and scrolling in frames
• Identify the purpose of inline frames
The <frameset> Tag
• A container tag, requires a closing </frameset>
tag
• Determines the frame types and sizes on the
page
• Two frame types:
– Columns
– Rows
Columns Example
• This frameset was created by the following
code: <frameset cols="35%,65%">
</frameset>
Rows Example
• This frameset was created by the following
code: <frameset rows="160,*"> </frameset>
The <frame> Tag
• Defines the content in each frame
• Placed between the <frameset> </frameset> tags
• The src attribute specifies the file that will appear
in the frame
• In the following example, the page that will appear
in the top frame is the file fl-toc.html, and the page
that will appear in the lower frame is flsecond.html.
<frameset rows="160,*">
<frame src="fl-toc.html" \>
<frame src="fl-second.html" \>
</frameset>
The Frameset Document
• Contains the the <frameset>, <frame> and
<noframes> elements
• The <frameset> and <frame> tags will create frames
only if they are placed correctly into this document
– In the frameset document, the <frameset>
element takes the place of the <body> element
– The opening <frameset> tag follows the closing
</head> tag
– The <frameset> tag must contain either the rows
attribute or the cols attribute, or both
Viewing Source with Framesets
• Click on the frame you want to view
• Take the necessary steps to view source
• The same instructions apply to printing from a
frame
The <noframes> Tag
• For user agents that cannot render frames
• Displays alternative text or images
– In some ways, similar to the alt attribute for
the <img> tag
• Code:
<noframes>
<body> If you had a frames-capable browser, you
would see frames here.
</body>
</noframes>
Targeting Frames with Hyperlinks
• Use the name attribute to name a frame, then target
the frame name with hyperlinks
• The syntax for naming a frame is as follows:
<frame src="url" name="framename”/>
• The following code names a frame:
<frame src="james.html" name=“authors”/>
• The following code targets this frame:
<a href="james.html" target=“authors"> Visit James </a>
• If a user clicks the Visit James link, the James page
will open in the Authors frame
Base Target
• A base target automatically sets a default
target frame for all links in a page
• Created using the <base> tag
• Code:
<base target="main" href=“page.html"/>
• This code will cause all linked pages to open
in the frame named Main
• The href attribute is optional
Borders, Margins and Scrolling
• To create borderless frames, add the
frameborder attribute to the <frame> tag
– frameborder=“1” causes borders to display
(the default)
– frameborder=“0” hides borders
• Example:
<frame src="home.html" name=“main“ frameborder="0"/>
Borders, Margins
and Scrolling (cont’d)
• Frame margin width and height
– The marginheight attribute designates the space,
in pixels, between the top and bottom margins
– The marginwidth attribute designates the space,
in pixels, between the left and right margins
Borders, Margins
and Scrolling (cont’d)
• Scrolling frames
– The scrolling attribute to the <frame> tag controls
whether the scrollbar appears
– The scrolling attribute values:
• “yes” — enables scrolling (the default)
• “no” — disables scrolling
• “auto” — allows the browser to decide
• Example:
<frame src=“ex.html" name=“ex" frameborder="0" scrolling="no"/>
Inline Frames
• Inserts an HTML or XHTML document inside
another
• Also called “floating frames”
• Created with the <iframe> tag
• The browser reads the <iframe> tag from the
file, then makes a separate request to the
server for the embedded file
Inline Frames (cont’d)
• Simple XHTML page with inline frame:
<h1>iFrame Example</h1>
<p><strong>This text is in iframe.html</strong><p/>
<iframe src="embedded.html" scrolling=”yes">
Your browser does not support frames.
</iframe>
<p><strong>This text is also in iframe.html. </strong></p>
• The next slide shows the results of this code…
Inline Frames (cont’d)
Inline Frames (cont’d)
• Inline frames are useful for:
– Web documents in which all content will
remain stable, except for one section (e.g.,
a weekly special) -- the frequently changed
section can be an inline frame, which can
be quickly modified when necessary
without editing the entire page
– Documents that you prefer to embed in a
page instead of placing on a separate page
or providing as a download (such as text or
a PDF)
Appropriate Use of Frames
• Frames are useful only in specific situations
• Consider the following issues:
– Function
– Appeal
– Development challenges
– Accessibility limitations
– Usability with the browser Back button
Lesson 10:
GUI HTML Editors
Copyright © 2004 ProsoftTraining, All Rights Reserved.
Objectives
• Identify types of GUI editors that automatically
create HTML and XHTML code
• Identify specific features of GUI editors
• Create a Web page using a GUI editor
• Identify requirements for publishing a Web site
publishing to a Web server
Introduction to GUI HTML Editors
• Graphical user interface (GUI) HTML editor
• Automatically generates HTML (or XHTML)
code
• Developer inputs content as in a standard
word processor
• Also known as WYSIWYG (What You See Is
What You Get) editors
Types of GUI Editors
• Page editors
– Simpler
– For smaller sites or non-collaborative work
• Netscape/Mozilla Composer
• Microsoft FrontPage Express
• Site management editors
– Tools to manage pages and sites
– Integrates with related applications
– Designers and developers can collaborate to design, build
and manage Web site and Internet applications
• Macromedia Dreamweaver
• Adobe GoLive
• Microsoft FrontPage
GUI HTML Editor Functionality
• Features of GUI editors:
– Templates and wizards
– Text style options
– Icon bars
– Images
– Hypertext links
– HTML importing
– Spelling check
– Table creation
– Publishing
W3C Authoring Tool
Accessibility Guidelines
• The guidelines mandate:
– The ability of the GUI editor to generate
proper code
– The usability of the GUI editor by a disabled
person creating a Web page
• Seven specific points
Creating Web Pages
with a GUI Editor
• Coursebook labs use the toolbar, menus and
functions of a GUI Web page editor
• Netscape Composer
HTML Text Editors
vs. GUI Editors
• HTML text editors (e.g., Notepad, Vi, Pico)
– Easily include other code (e.g., JavaScript)
– Readily modify code
– Apply your HTML/XHTML knowledge and skills
• Drawbacks:
– Typing code is time-consuming
– People with disabilities may find manual entry
difficult or impossible
– Require a higher degree of effort to create even a
simple page
GUI HTML Editors
• GUI HTML editors
– Quick code creation
– Facilitate collaboration
– Spelling checker
– Automatic publishing
• Drawbacks:
– Rarely keep pace with the evolution of
HTML/XHTML standards
– Code you enter manually may be ignored
Previewing Pages
and Validating Code
• Most GUI editors make it easy to:
– Preview pages in a browser
– View source code
– Validate code
• Validating HTML code
– Specify the correct <!DOCTYPE> before
validating; the GUI HTML editor may not do this
– Many tools provide useful validation tools
– Some editors provide tools for disabled users
Web Site Publishing
• GUI HTML editors usually provide a publishing
feature
• FTP is the standard protocol for Web page
publishing
– Stand-alone FTP clients
– FTP client provided by GUI HTML editor
Publishing to a Test Web Server
• Before publishing pages to a public site, post them
to a test server
– Often called a staging server
– Verify that pages work and render as expected
– Verify that CGI script works as expected
– Locate and repair dead links
– Allow stakeholders to preview the site
• Test server configuration
– Test server must be identical to production server
– Use the same Web server software and CGI
solution
Web Site Publishing (cont’d)
• Example settings for publishing with Netscape
Composer
Lesson 11:
Advanced Web Technologies
Copyright © 2004 ProsoftTraining, All Rights Reserved.
Objectives
• Identify client-side and server-side scripting
technologies
• Connect Web pages to databases
• Use CSS to apply formatting to Web pages
• Identify the benefits of Dynamic HTML (DHTML)
• Define the function of the Document Object Model
(DOM) and its relationship to browsers
• Compare the use of a service provider to hosting
your own Web site
Extending HTML
• Client-side and server-side scripting
• Connecting to databases
• Additional ways to apply Cascading Style
Sheets (CSS)
• Dynamic HTML (DHTML)
• Document Object Model (DOM)
Server-Side and Client-Side
Languages
• Programming concepts
– Not required knowledge, but essential
terminology is useful to understand
• Programming statements
– if/then
– if/then/else
– do while
– do until
– break
Server-Side Languages
• Attributes of server-side language:
– Code is executed by the Web server, not the Web
browser
– Code executes because an interpreter has been
installed and activated on the Web server
• Server-side scripts are used for various purposes:
– Browser detection
– Database connectivity
– Cookie creation and identification
– Logon scripts
– Hit counters
– File uploading and downloading
PHP Hypertext Preprocessor (PHP)
• An interpreted server-side scripting language for creating
dynamic Web pages
• Embedded in HTML pages but usually executed on a Web
server
• Example of PHP code:
<?php
$envVars = array("HTTP_USER_AGENT");
foreach($envVars as $var)
{
print "
<html><head><title>PHP CGI Example</title></head><body>
<h1>Hello, World!</h1>
Your user agent is:<strong>${$var}.</strong>
<br/>
</body></html>
";
}
?>
Practical Extraction and
Report Language (Perl)
• Another server-interpreted language
• Older, but very popular
• Example of Perl code:
#!/usr/bin/perl
use CGI qw/:all/;
$cgi_object = CGI::new();
print "Content-type: text/html\n\n";
print "<html>\n<head>\n<title>\nPerl CGI
Example\n</title>\n<body>\n<h1>Hello,
World!</h1>\nYour user agent is: <b>\n";
print $cgi_object->user_agent();
print "</b>.</html>\n";
Active Server Pages (ASP)
using VBScript
• Microsoft’s original server-side scripting solution
• Example of ASP code using VBScript:
<%@ LANGUAGE=vbscript %>
<html>
<head>
<title>ASP CGI Example</title>
</head>
<body>
<h1>Hello, World!</h1>
<%
path = Request.ServerVariables("PATH_INFO")
pagename = Request.ServerVariables("HTTP_HOST")
method = Request.ServerVariables("REQUEST_METHOD")
browser = Request.ServerVariables("HTTP_USER_AGENT")
user = Request.ServerVariables("REMOTE_ADDR")
C
• A procedural language (relies upon subprograms to
accomplish a task in an application)
• C is a time-honored language, usually used to create standalone applications and operating systems (e.g., UNIX/Linux)
• Can also be used for CGI
• Example of C code:
#include <stdio.h>
int main()
{
printf("Hello, World!\n");
return 0;
}
• Note this code includes a reference to a library called stdio.h
C++
• Object-oriented language
– A style of programming that links data to the
processes that manipulate it
– May include procedural elements, but instead of
using subprograms to accomplish a task, will
create an object that can then be manipulated
throughout the program
– Once an object is created, it can be reused
• Platform dependent:
– Must be compiled to a specific architecture (e.g,
IBM-compatible, PowerPC)
Java
• Object-oriented
• Compiled
• Platform-independent
– Marketing: Write once, run anywhere
– Reality: Write once, test everywhere
• Java can be used to write:
– Stand-alone applications
– Servlets
– JavaServer Pages (JSP)
Visual Basic
• A compiled programming language developed
by Microsoft Corporation
• Used for stand-alone applications and serverside Web applications
• Once only procedural, now has object-based
elements
C#
•
•
•
•
Object-oriented
Compiled
Platform-dependent
Used for Microsoft .NET program
Server Side Includes (SSIs)
• An instruction inside of an XHTML/HTML page that
directs the Web server to perform an action
• An alternative to CGI
• SSI instructions are in SGML
• Can be used to:
– Place the results of a database query into a page
– Execute other programs
– Indicate the last time a document was modified
– Insert footer text at the bottom of a page
– Add the current date as a timestamp to a page
Server Side Includes (SSIs)
(cont’d)
• Standard SSI file name extensions:
– .shtml
– .shtm
• SSI support in Web servers
– Most Web servers include code that
enables SSI
– However, the SSI feature may be disabled
• You may have to activate the feature
• You may also have to define a MIME type
Client-Side Languages
• Issues with client-side languages
– Some clients do not support JavaScript or
any other such scripting language
– Users can deactivate script execution in
browsers that normally support it
JavaScript
• Object-based
• Adds interactivity to Web pages
• Can also be used on the server side (Server-Side
JavaScript, SSJS)
• On the client side, can be used to:
– Detect browsers
– Create cookies
– Create mouse rollovers
• JavaScript advantages
– Platform-independent
– Vendor-neutral
– Relatively simple
JavaScript (cont’d)
• Can be placed in an HTML/XHTML document
– Use the <script> tag
• Browser detection (using JavaScript or any
other scripting technology) is useful for:
– Presenting different versions of a site to
different browsers
– Informing users in a corporate intranet to
upgrade their browsers to a supported
version
– Ensuring accessibility to disabled users
JavaScript (cont’d)
• JavaScript and cookies
– Cookies are stored on the hard drive
– Cookies can be used to:
• Store passwords
• Store user preferences
• Choose which Web pages will be
displayed based on browser version
VBScript
• Microsoft’s answer to JavaScript
• Can be used on the client side or the server
side
• If used on the client side, only Internet
Explorer can render the script
Connecting to a Database
• For a database to work, you must:
– Provide a way for the Web server and
database to recognize each other
• Microsoft systems can use ODBC
• Other methods include PHP scripts
– Provide permissions to the database so it
can be read and/or written to
• You must also supply SQL scripts
CGI and Permissions
• Aside from improper coding, CGI scripts
usually fail to execute because:
– The Web server does not have the
permissions to execute files and scripts
– The file or script used has incorrect
permissions, which prohibits the server
from executing the file
ISPs and CGI
• If working with an Internet Service Provider
(ISP), you generally need to:
– Request CGI services
– Request that the ISP:
• Enables execute permissions on your
scripts
• Creates a directory that contains
available CGI scripts
• Provides user name and passwords with
enough permissions to work the system
N-Tier Applications
• When discussing databases, three elements are
generally involved:
– Data
• The database file or multiple database files
– Business logic
• The SQL coding necessary to create
relationships with the data stored in the
database
– Presentation
• The way that data and business logic are
presented on the user screen
N-Tier Applications (cont’d)
• In n-tier, all three database elements are separated
Styling Techniques with CSS
• Types of CSS include:
– Linked style sheet
• The <style> and <font> tags in the
HTML/XHTML file will override style
sheets
– Inline style
– Embedded style
– Imported style sheet
Declaring an Inline Style
• The <span> tag
– Can span multiple elements:
<span style="background: red">
CIW Associate </span>
• The style attribute
– Used inside a tag:
<h1 style=“color: magenta; font-family: arial”>
CIW Associate </h1>
Embedded Styles
• An embedded style sheet uses the
<style> tag within the <head> section:
<head>
<title>Certified Internet Webmaster</title>
<style>
h1 {color: magenta; font-family: arial; font-size: 20pt}
</style>
</head>
• The style will remain in force until
overridden (e.g., by an inline style)
Imported Style Sheets
• Like a linked style sheet, refers to a separate
file
• Created using the @import statement with the
following syntax:
@import url(filename.css)
<head>
<title>Certified Internet Webmaster</title>
<style type="text/css">
@import url(import.css);
</style>
Style Sheets and
Browser Compatibility
• Styles can cause problems with older
browsers
– Imported styles can especially cause
problems
– Test your code in multiple browsers
• Most modern browsers are designed to
support style sheets
Dynamic HTML (DHTML)
• An enhancement that provides animation,
interactivity and dynamic updates in pages
• DHTML capabilities include:
– Automatic adjustment of font sizes and
colors
– Absolute positioning
– New document content
– Granular control over animation, audio and
video
• Requires XHTML 1.0 or HTML 4.01, CSS, and a
way to access the Document Object Model
(DOM)
The Document Object
Model (DOM)
• A vendor-neutral, cross-platform application
programming interface (API)
• Specifies how objects in a document can be
referred to and manipulated through scripting
languages
• Describes the elements, or objects, within a
document rendered by a user agent (e.g., Web
browser)
• A W3C standard
The Document Object Model (DOM)
(cont’d)
• Accessing a browser's DOM
– Use a scripting language
• JavaScript
• VBScript
– DOM compliance
• At one time, several DOMs, depending upon
browser manufacturers
• W3C standardization
• Choosing a DOM-compliant browser
• Undefined object error and the DOM
• XHTML, the DOM and browser compatibility
Working with Web Service Providers
• Internet Service Provider (ISP)
– Provides basic services
• Internet connectivity
• Web server
– You need your own experts
• Application Service Provider (ASP)
– Provides more advanced services
• Messaging (i.e., e-mail)
• Databases
• Spam filtering
• Telephony services
Costs of Using an ASP
• Often based on:
– Amount of traffic
– Amount of support you require
• Database connectivity
• Per-service costs
• Bandwidth
• Customer support
• Security
Co-Location, Dedicated Hosting
and Virtual Servers
• Co-location
• Dedicated hosting (co-hosting)
• Virtual server
Comparing Options
• Configuring your own hosting solution
– Benefits
– Drawbacks
• Using an ISP
– Benefits
– Drawbacks
• Using an ASP
– Benefits
– Drawbacks
Communicating Needs and
Negotiating Services
• Be prepared to detail your needs
• Negotiate prices by providing information:
– Potential amount of traffic
– Hard drive space needed
– Database and CGI needs
– Additional services (e.g., custom applications)
• As you work with ISP and ASP sales
representatives,
– Communicate your needs
– Talk to the sales representative manager
– Have your manager talk to the ISP/ASP manager
Information You Need from
Your Service Provider
•
•
•
•
•
Account information
IP addresses and DNS names of the server
Instructions about file and directory locations
The service provider’s contact information
Additional information:
– ISP/ASP security policies
– ISP/ASP support procedures
– Procedures for reporting problems
– Average timelines for resolving problems
Lesson 12:
E-Commerce Practices
Copyright © 2004 ProsoftTraining, All Rights Reserved.
Objectives
•
•
•
•
•
•
Compare e-commerce to traditional commerce
Define e-commerce terms and concepts
Relate the concept of supply chain to e-commerce
Identify payment models used in e-commerce
Identify ways to protect private transactions
Identify issues related to working in a global
environment
• Identify ways to build e-commerce relationships
using Web-based technology
Traditional Commerce
vs. E-Commerce
• Similarities
– Both aim to deliver a valued product or service
– Both want to serve a large audience
– Both strive to quickly deliver products and services
• Differences
– E-commerce customers expect shorter fulfillment time
– E-commerce customers must understand Web-based
technologies
– E-commerce provides a global audience
– E-commerce orders are processed without human
interaction or travel to a store location
– E-commerce relies upon encryption for security
E-Commerce Models
• Business to consumer (B2C)
– Targets consumers or end users, and sells
products and/or services
• Amazon.com, small business sites
• Business to business (B2B)
– Helps organizations to manage relationships
and transactions with other businesses
• B2BExchange
• Consumer to consumer
– Not a traditional B2C model
• eBay
Business and Internet
Technologies
• Traditional businesses also use e-commerce
– Not an either/or proposition
– Web technologies make traditional
business more efficient
• E-commerce concepts:
– Supply chain management
– Enterprise resource planning (ERP)
– B2B information sharing
– Internet marketing
Supply Chain Management
• The ability to manage the process that
generates a product and distributes it to
customers
– You must manage the process that begins
with raw materials and ends with a product
delivered to a consumer
– Customer can be:
• An end user
• Another business that resells your
product after adding value to it, known
as a Value Added Reseller (VAR)
Supply Chain Management (cont’d)
• Traditional supply chain management model
• Professionals running e-commerce sites
increasingly need to understand this model
Supply Chain Management (cont’d)
• Supply chain management involves the
following business aspects:
– Product demand
– Information flow
– Finance management
• Essential supply chain management terms
– Upstream and downstream
– Capacity requirements plan
– Additional terms found in coursebook
Enterprise Resource Planning (ERP)
• Use of software to create an automated plan for
company operations
• ERP goal -- enhance communication among all
company departments and divisions through
software automation
• Accomplished through automation of tasks and
reporting
• All company/organization departments involved
• Common terms:
– Bolt-on system
– Application programming interface (API)
– Library
B2B Information Sharing
with XML
• XML allows information to be indexed once,
then used in many different applications and
companies
• DTD limitations
• XML schema
Internet Marketing
• More than technical knowledge is needed
– Relationship to the business, including the
marketing department
• Marketing terms
E-Commerce Information-Formatting
Technologies
• When businesses need to exchange
information, they must agree upon universal
information-formatting methods
• The two most common ways to format
information are:
– Electronic Data Interchange (EDI)
– Open Buying on the Internet (OBI)
Electronic Data Interchange (EDI)
• A universal method for formatting information so it
can be transferred among organizations
• In place for over 20 years
• Useful for exchanging:
– Invoices
– Bills
– Purchase orders
– Inventory lists
– Supply chain information
• EDI implementation and drawbacks
• EDI and XML
Open Buying on the Internet (OBI)
• Designed as an alternative to EDI
• Developed to target high-volume, low-cost
transactions
– These account for almost 80 percent of
most companies' purchasing activities
• OBI components
• OBI transactions
• OBI and EDI
• OBI and XML
E-Commerce
Payment Technologies
• Payment technologies include:
– Electronic Funds Transfer (EFT)
– Payment gateways
– Secure Electronic Transactions (SET)
– Open Trading Protocol (OTP)
– Secure Sockets Layer (SSL) / Transport
Layer Security (TLS)
Electronic Funds Transfer (EFT)
• A generic term that describes the ability to transfer
funds using computers rather than paper
• Also known as wire transfer
• EFT systems must ensure:
– Confidentiality of payment information
– Integrity of payment information
– Merchant authentication
– Interoperability
• Automated Clearing House (ACH)
– Governed in the United States by the National
Automated Clearing House Association
– Used in EFT
Payment Gateway
• Mediates between a merchant and a merchant
bank
• Once the merchant receives payment from a
customer, the merchant uses the payment gateway
to transmit credit card information to the bank
• Responsibilities:
– Forwarding information
– Authenticating participants
– Ensuring confidentiality
– Ensuring data integrity
• Payment gateway companies
Secure Electronic
Transactions (SET)
• Uses digital certificates to secure financial
transactions
• Public and private keys ensure encryption,
data confidentiality and non-repudiation
• Designed to allow both simple and complex
transactions
• History of SET
• SET example
• SET vs. conventional transactions
Open Trading Protocol (OTP)
• Alternative to SET
– An open standard (RFC 2802)
– Used for both B2C and B2B
– Often used with XML
• OTP features:
– Provides trading protocol options to control the
way that the trade occurs
– Provides a record of a particular trade
– Supports real and virtual delivery of goods and
services (payment tracking)
Secure Sockets Layer (SSL) /
Transport Layer Security (TLS)
• Not transaction methods
• Used to secure transactions
• Services provided:
– Authentication
– Data confidentiality
– Data integrity
SSL/TLS and
Public Key Infrastructure (PKI)
• You need a certificate to enable host
authentication before you can begin an SSL
session
• Public Key Infrastructure (PKI)
– A collection of individuals, networks and
machines that comprise the ability to
authoritatively confirm the identity of a
person, host or organization
PKI Elements
• PKI elements include:
– Digital certificate
– Certificate authority (CA)
– Registration authority (RA)
– Certificate server
– Certification chain
Digital Certificates and X.509
• Digital certificates used in PKI conform to the ITU
X.509 standard
• X.509 describes how to format digital certificates
PKCS Standards
• Public-Key Cryptography Standards (PKCS)
– Used to store and transport certificates
• PKCS #7
– Used to secure e-mail certificates
• PKCS #10
– Used to generate a certificate request to a
certificate authority (CA)
Certificate Life Cycle
• Certificates usually have a limited life (e.g., 1
month, 2 years, 6 years)
• Life cycle helps reduce the likelihood of fraud
• Terms include:
– Certificate policy
– Certificate Practice Statement (CPS)
– Certificate expiration
– Certificate revocation
– Certificate suspension
– Certificate renewal
– Certificate revocation list (CRL)
– Online Certificate Status Protocol (OCSP)
Additional SSL/TLS Concepts
• The SSL/TLS handshake
• Common applications
• Beginning an SSL/TLS session
– Encryption begins after authentication
– Issues:
• Different host name
• Certificate expired
• Certificate date not yet valid
• Invalid certificate format
• Certificate presented by the server not
signed by a recognized CA
• Incompatible encryption settings
Working in a Global Environment
• By placing your business on the Web, you
expand your audience to include anyone in the
world with a browser and Internet access
• Consider the level to which you will
accommodate potential customers from
countries outside yours
– Issues to consider include:
• Currency exchange rates
• International shipping
• Language concerns
• Relationship management
Currency and Trade
• Each country (e.g., China) and economic block
(e.g., European Union) uses its own currency
• Businesses and organizations must be able
to:
– Automatically calculate exchange rates for
the day of the transaction
– Calculate taxes and tariffs on goods
• Taxes, tariffs and trade
International Shipping
• Consider the following issues:
– Customs searches
– Costs incurred by customs
– Delays caused by customs
– All tariffs
• Legal and regulatory issues
Language Concerns
• As you develop an e-commerce site, consider
the following issues:
– The language(s) used by the target
audience
– The characters necessary (e.g.,
alphanumeric, mathematical or currency
symbols)
• Character sets and languages
– Computers can use different character sets
– Unicode
Relationship Management
• Building trust
– Quality customer service
– Frequent contact
• Customer self-service
– Automatic order tracking
– Unattended choice
– Order customization
Thank you for attending
Site Development
Foundations
© 2004 ProsoftTraining
All rights reserved
Copyright © 2004 ProsoftTraining, All Rights Reserved.