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Unit 6: Introduction to JavaScript

Self Assessment Notes

Fill in the blanks:
5. JavaScript can put ........................... text into an HTML page.
6. A JavaScript can be used to validate form data before it is submitted to a ...........................

6.4 Script (<script>)Tag

In Javascript, SCRIPT tags can be inserted into three places: in between the two BODY tags, in
between the two HEAD tags, and as a link to an external file, also in the HEAD section.
Some advocate putting the SCRIPT tags in the BODY section, right at the end. Like this:

Figure 6.1: SCRIPT Tags in the BODY Section

The reason to do it this way is because the web page itself will have loaded before the script is
read. If it’s in the HEAD section, the script will be parsed before any HTML or CSS elements are
loaded. If your Javascript references any of the web page’s elements, there may be a slight delay
in the fancy effects you want to apply, or it may just not work at all.

For the most part, though, we’ll place our script tags in the HEAD section of the HTML. Like this:
Figure 6.2: Script Tags in the HEAD Section

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