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JavaScript How To
How to Put a JavaScript Into an HTML Page
<html> |
The code above will produce this output on an HTML page:
Hello World! |
Example Explained
To insert a JavaScript into an HTML page, we use the <script> tag.
Inside the <script> tag we
use the "type="
attribute to define the scripting language.
So, the <script type="text/javascript"> and </script> tells where the
JavaScript starts and ends:
<html> |
The word document.write is a standard JavaScript command for writing output to a page.
By entering the document.write command between the <script>
and </script> tags, the browser will recognize it as a JavaScript command and
execute the code line. In this case the browser will write Hello World! to the page:
<html> |
Note: If we had not entered the <script> tag, the browser would have
treated the document.write("Hello World!") command as pure text, and just write the entire line on the page.
HTML Comments to Handle Simple Browsers
Browsers that do not support JavaScript will display JavaScript as page
content.
To prevent them from doing this, and as a part of the JavaScript standard,
the HTML comment tag can be used to "hide" the JavaScript. Just add an HTML
comment tag <!-- before the first JavaScript statement, and a --> (end of
comment) after the last JavaScript statement.
<html> |
The two forward slashes at the end of comment line (//) is the JavaScript comment symbol.
This prevents JavaScript from executing the --> tag.
Gayabo
posted by Computer @ 10:32,
