JavaScript How To Put a JavaScript Into an HTML Page
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The HTML script tag is used to insert a JavaScript into an HTML page.
How to Put a JavaScript Into an HTML Page
<html
<body
script type="text/javascript"
document.write("Hello World!");
/script
</body
</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
<body
script type="text/javascript"
...
/script
</body
</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
<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 (html comment removed: before the first JavaScript statement, and a ) (end of comment) after the last JavaScript statement.
<html
<body
script type="text/javascript"
(html comment removed:
document.write("Hello World!");
//)
/script
</body
</html
The two forward slashes at the end of comment line (//) is the JavaScript comment symbol. This prevents JavaScript from executing the --> tag.
Please everywhere you come across script, it should be close like this < script > but no space please. Thanks.