gridview textbox validation

Ramya S

10y1.1k.NET

function in javascript:

function updatealert()

{

var f = document.getElementById('<%=(gvStock.FooterRow.FindControl("txtQnty")).ClientID%>');

if(f.value =='' ")

{

alert("Enter Quantity");

return false;

}

gridview template:

im getting this error:

An exception of type 'System.NullReferenceException' occurred in App_Web_ol5f1rt3.dll but was not handled in user code

Additional information: Object reference not set to an instance of an object

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Samir Bhogayta10y ago
Accepted answer
Hi..If you using this gridview for cart then don't do this use "Repeater" for your cart. It's gives better result then gridview. After using "Repeater" you can use following with your quantity textbox.

Try this...It's working for me.
0
Vincent Maverick Durano10y ago
Don't use FindControl when referencing a server control from JavaScript. What you need to do is to use jQuery selector or check the source of the your HTML and then get the generated ID of the control that you are looking, and use that ID instead.
Alternatively, if you are using .NET 4.0 and above then I would recommend you to check in ClientIDMode. Check this article for better understanding about it:https://weblog.west-wind.com/posts/2010/May/04/Whats-New-in-ASPNET-40-Part-Two-WebForms-and-Visual-Studio-Enhancements
0