How to use JavaScript in HTML page

In this JavaScript tutorial you will learn how to use JavaScript in HTML page, how to write output to a page, different places where JavaScript can be paced in HTML, JavaScript in external file and how to place and execute JavaScript in external file.

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Hi,

just create a .js file using notepad editor i mean javascript function u bind the javascript file in html using script tag 'src' attribute like


Ex:

Example.js
----------

function f1(t)
{
if (t.value=' '){
alert('Text Box shold not be empty')
}
}

Example.html
-------------

when ever u click the button it will call the js file f1 funtion it will verify the text box data if it empty it will give the alert message if not nothing will happen.

do u have any quries let me know......

Regards,
Hari Prasad

correct you can use the javascript anywhere of the page

How to Handle Older Browsers
Browsers that do not support JavaScript will display the script as page content. To prevent them from doing this, we may use the HTML comment tag:



The two forward slashes at the end of comment line (//) are a JavaScript comment symbol. This prevents the JavaScript compiler from compiling the line.

With traditional programming languages, like C++ and Java, each code statement has to end with a semicolon.

Many programmers continue this habit when writing JavaScript, but in general, semicolons are optional! However, semicolons are required if you want to put more than one statement on a single line.