How to avoid posting the page when Submit button is clicked?

Posted Date: 02 Nov 2004	Resource Type: Articles	Category: ASP.NET/Web Applications
Author: S. Suresh	Member Level: Gold
Rating:	Points: 5

Introduction

In a typical ASP.NET web application page, when we click on the submit button on the page, the page will be posted to the server. We can inject code into the client side by which we can stop posting the page unless otherwsie our clien side validations are all succeeded.

Consider a case where we have button (asp.net control) with the id btnSubmit and we need to do some validations on click of the button btnSubmit. We can achieve it by the following steps.

Steps to do:
1. On the codebehind page of the aspx file (i.e. aspx.cs ) write the following code on page_load:

btnSubmit.Attributes.Add("onclick","return PostNow()");

This code will inject the client side code 'onclick="return PostNow()"' on the page. You can check it by diong view source when your page is loaded in the browser.

2. Add a client side function PostNow() in the HTML page of the aspx file. Let this function do all the validations and if all the validatiosn succeed then return true or return false. If this function returns false then the page will not be posted and if the function returns true then the page will be posted.


<script language="javascript">
	function PostNow()
	{
		alert ('Do your validations here');
		return false;
	}
</script>

In the above code I'm returning true always. This part of code has to be customized to suit your requirements.

Do let me know if any of you need clarifications on this. Also do mail me to get the full code for the page.

Thanks,
S Suresh
9342509573

Responses

Author: Mohan Raju Datla 03 Nov 2004 Member Level: Bronze Points : 0

this is helped me allot

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