Wednesday, May 20, 2009

Use of Java Script.


Definition and Usage.


The <script> tag is used to define a client-side script, such as a JavaScript.

The script element either contains scripting statements or it points to an external script file through the src attribute.

The required type attribute specifies the MIME type of the script.

Common uses for JavaScript are image manipulation, form validation, and dynamic changes of content.

Example.


<html>
<body>
<script type="text/javascript">
document.write("Hello World!")
</script>
</body>
</html>

Differences Between HTML and XHTML.


HTML 4 and XHTML deal different with the content inside scripts:

  • In HTML 4, the content type is declared as CDATA, which means that entities will not be parsed.
  • In XHTML, the content type is declared as (#PCDATA), which means that entities will be parsed.
    This means that in XHTML, all special characters should be encoded or all content should be wrapped inside a CDATA section.

    To ensure that a script parses correctly in an XHTML document, use the following syntax:

    <script type="text/javascript"><![CDATA[
    document.write("Hello World!")
    //]]></script>>
    • Posted by Muhammad Waqas Shaikh at 12:55 AM

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