Use JavaScript Function on blur() and on focus() in ASP.NET

Step 1

 

Just drag one simple textbox from toolbox and just add attributes like the below screen shot.

 

 

Step 2

 

Then as we know, just write the required functions inside the Script tag like below:

 

 

That's it, now this function will be triggered inthe  client side and you will get the Output like the below screen shot

 

Output 1

 

While Cursor is on the Bill no,

 

 

Note

 

Changed to the Yellow Color since we have provided the color as "Yellow" in the myFocusFuction() in the above JavaScript code.

 

Output 2

 

Once it came out of the Bill No.

 

 

Note

 

Back to the Normal Color since we didn't provide any color in the myBlurFuction() in the above JavaScript code.