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    javascript - how to do a getElementById on an ASP.NET control - Stack Overflow

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    I have an element on my page.

    <asp:Button ID="buttonToFind" runat="server" OnClick="SomeProcess" />

    In javascript I'm trying to find this control using:

    document.getElementById("buttonToFind");

    However it can't seem to find the control. My understanding is that the asp:Button gets changed to an input element? This input has a new ID that contains the original ID but with a lot of extra characters therefore I can't find the original ID on the page?

    Is this correct?

    Also given this how would I go about specifying the correct ID to search for?

    I have an element on my page.

    <asp:Button ID="buttonToFind" runat="server" OnClick="SomeProcess" />

    In javascript I'm trying to find this control using:

    document.getElementById("buttonToFind");

    However it can't seem to find the control. My understanding is that the asp:Button gets changed to an input element? This input has a new ID that contains the original ID but with a lot of extra characters therefore I can't find the original ID on the page?

    Is this correct?

    Also given this how would I go about specifying the correct ID to search for?

    • javascript
    • asp
    Share Improve this question edited Dec 20, 2010 at 20:40 BigJim asked Nov 10, 2010 at 3:16 BigJimBigJim 4111 gold badge6 silver badges20 bronze badges
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    4 Answers 4

    Reset to default 3

    You need the ClientID property of the control. In ASP.NET 4 you can also set the ClientIDMode to Static. Source

    Your understanding is correct.

    This will work if the JS is on the ASPX/ASCX markup:

    document.getElementById('<%= buttonToFind.ClientID %>');

    If the JS is external, you'll need to do extra work (e.g use a literal to hold the ID's, or register a script).

    Any server control will be gave new client side Id so yuo can use the ClientId of any control you wana pass to Javascript :) so 

    document.getElementById('<%= buttonToFind.ClientID %>');

    should be your answer

    You need to get the server control's client id:

    document.getElementById("<%=buttonToFind.ClientID%>");

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