Two Ways To Call A User Defined Function In JavaScript

Calling a user defined function in the JavaScript which exists in a .js file or on the page through the Visual Studio.

Way -1

 

Step 1: Create an Empty website named ‘Tutorials_JS’.

 

 

Step 2: Add a page named ‘Default.aspx’ by right-clicking on the project in the Solution Explorer and click on "Add" -> "New Item".

 

 

Step 3: Add a button on the page from the Toolbox and Add a function using the javascript in the head tag.

<script language="javascript" type="text/javascript">
function show() {
    alert("This is my function");
}
</script>

After that create an ‘OnClientClick’ event on the button with the calling of the ‘show' function.

 

 

Step 4: Run the Page and click on the button to see the output.

 

 

Way -2

 

Step 1: Create a .js file named ‘JScript’.

 

 

Step 2: Add a function in the .js file.

 

 

Step 3: Add the .js file on your page and add a button with the ‘OnClientClick’ event which calls the ‘show’ function.

 

Step 4: Run the Page and click on the button to see the output.