JavaScript How To
The HTML <script> tag is used to insert a JavaScript into an HTML
page.
Examples
Write text with
Javascript
The example demonstrates how to use JavaSript to write text on a web page.
Write HTML with
Javascript
The example demonstrates how to use JavaScript to write HTML tags on a web page.
How to Put a JavaScript Into an HTML Page
<html>
<body>
<script type="text/javascript">
document.write("Hello World!");
</script>
</body>
</html>
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The code above will produce this output on an HTML page:
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>
<body>
<script type="text/javascript">
...
</script>
</body>
</html>
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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>
<body>
<script type="text/javascript">
document.write("Hello World!");
</script>
</body>
</html>
|
Try it yourself.
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.
Try it yourself.
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>
<body>
<script type="text/javascript">
<!--
document.write("Hello World!");
//-->
</script>
</body>
</html>
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The two forward slashes at the end of comment line (//) is the JavaScript comment symbol.
This prevents JavaScript from executing the --> tag.
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