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Asked: 2026-05-11T15:15:17+00:00

I’m little confused here now. Let me explain: I’ve seen people talking about adding

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I’m little confused here now. Let me explain:

I’ve seen people talking about adding a button or some other control to the page in asp.net (3.5) and when the control renders it changes the Id of that control, eg. Button1 becomes Button1_somethingsomething which prevents them from using jQuery and what they end up using is something such as <%controlId.ClientId %>

So I did a little test

1. I added a button on the page: <form id='form1' runat='server'> <div> <asp:Button ID='Button1' runat='server'  Text='Button' /> <div>  2. Then I added a JavaScript and jQuery: <script type='text/javascript'>                     $(document).ready(function() {                     $('#Button1').click(function() {                         alert('Hello world!');                     });                      });                 </script>  3. The generated html is this: <div>   <input type='submit' name='Button1' value='Button' id='Button1' /> <div>

Now, I don’t see ASP.NET (asp.net 3.5) changing the ids. Why do I see different behavior?

Btw. This does work when I hit the button!

Thanks.

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1 Answer

  1. ASP.NET only changes the IDs when the control is inside of a Naming Container. This could include certain user controls, ContentPlaceHolders from a master page, and repeating controls (Repeater, GridView, etc.)

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