Add
scripts to HTML pages to make them more dynamic and interactive. A script in
HTML is defined with the <script> tag. Note that you will have to use the
type attribute to specify the scripting language.
E.g.: <html>
<head>
</head>
<body>
<script type="text/javascript">
document.write("Hello World!")
</script>
</body>
</html>
The
script above will produce this output:
Hello
World!
i) Handling
Older Browsers; A browser that does not recognize the <script> tag at
all, will display the <script> tag's content as text on the page. To
prevent the browser from doing this, you should hide the script in comment
tags. An old browser (that does not recognize the <script> tag) will
ignore the comment and it will not write the tag's content on the page, while a
new browser will understand that the script should be executed, even if it is
surrounded by comment tags.
Example:
<script type="text/javascript">
<!--
document.write("Hello World!")
//-->
</script>
ii) The
<noscript> Tag: In addition to hiding the script inside a comment, you
can also add a <noscript> tag. The <noscript> tag is used to define
an alternate text if a script is NOT executed. This tag is used for browsers
that recognize the <script> tag, but do not support the script inside, so
these browsers will display the text inside the <noscript> tag instead.
However, if a browser supports the script inside the <script> tag it will
ignore the <noscript> tag.
Example:
<script type="text/javascript">
<!--
document.write("Hello World!")
//-->
</script>
<noscript>Your browser does not support JavaScript!</noscript>
iii) Script
Tags:
|
Tag
|
Description
|
|
<script>
|
Defines a script
|
|
<noscript>
|
Defines an alternate text if the
script is not executed
|
|
<object>
|
Defines an embedded object
|
|
<param>
|
Defines run-time settings (parameters)
for an object
|
|
<applet>
|
Deprecated. Use <object> instead
|
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