How to change the value of textbox without posting page back to the server

Hello everyone,

I have a simple form with 3 textboxes namely txtNumber1, txtNumber2, txtTotal.

The txtTotal will display the sum of txtNumber1 and txtNumber2. I'd like when the user enter a number either in txtNumber1 or txtNumber2 the txtTotal will automatically update its value without posting page back to the server. Do I need to utilize Ajax to accomplish it?

Thanks for reading.  

9/1/2008 8:20:53 AM 93655 articles. 3 followers. Follow

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There are couple of options you can use:

1] Use Java Script to Populate your txtTotal on change of text in txtNumber1  / txtNumber2

2] You can use AJAX, by putting your controls in UpdatePanel. Have a button Calculate (outside Update Panel), which will calculate and populate txtTotal from you.

Ho[pe this helps.



9/1/2008 8:40:31 AM

I think i will use the first approach. But could you please tell me more detail?I'm not sure how to use JavaScript in ASP.NET pages.

Thank you for your reply

9/1/2008 8:46:43 AM


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Sum Example</title>
<script type="text/javascript">
function Sum()
	var txtNumber1 = document.getElementById('txtNumber1');
	var txtNumber2 = document.getElementById('txtNumber2');
	var txtTotal = document.getElementById('txtTotal');
	if (txtNumber1.value.length > 0 && txtNumber2.value.length > 0 && isNaN(txtNumber1.value) == false && isNaN(txtNumber2.value) == false)
		txtTotal.value = txtNumber1.value*1 + txtNumber2.value*1;
		txtTotal.value = '';
Number 1: <input type="text" id="txtNumber1" onBlur="Sum();" /><br>
Number 2: <input type="text" id="txtNumber2" onBlur="Sum();" /><br>
Total: <input type="text" id="txtTotal" />

 If you want to use asp:Textbox the from server side add attribute of Textbox.


In Page_Load



I hope this help you.

Please mark as Answer if it helps u. Thanks!

Parth Patel
Techsture Technologies
Software Developer
9/1/2008 8:55:16 AM

Thanks for your post. It worked as I expected

9/1/2008 9:37:41 AM

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