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Editorial Team
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Asked: 2026-06-03T13:50:22+00:00

I have aspx pages which uses repetitive code. So I put them on a

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I have aspx pages which uses repetitive code. So I put them on a masterfile and referring that in all other files. I have used the <asp:Content ID> in all other pages where I included master page like,

<asp:Content ID="Step1Content" ContentPlaceHolderID="MainContent" Runat="Server">

My issue is now all the field id’s has a suffix of ContentPlaceHolderID_fieldName and because of this my javascript doesn’t work.

<input id='chkRaces_1' type='checkbox' runat='server' onclick="enableShow50();" /><label for='chkRaces_1'>American Indian or Alaska Native</label><br />

When I debug, it appears like,

<input id="MainContent_chkRaces_1" type="checkbox" onclick="enableShow50(<%# Eval(chkRaces_1.ClientID) %>);" name="ctl00$MainContent$chkRaces_1">

and my Javascript which refrences using id='chkRaces_1' fails. I thought of replacing all the inputs with <asp:ListItem> tags n so, but I get error."type HtmlInputCheckBox" is not compatible with "ListItem". So I got to change the class too which I don’t want to.

What else I can do to achieve the same with minimal change in aspx.

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1 Answer

  1. Editorial Team

    You can use ClientIDMode, but keep in mind that’s only available in .NET 4.0 and above.

    <asp:Label ID="SelectedSport" runat="server" ClientIDMode="Static">
</asp:Label>

    Or in JavaScript:

    var userLabel = document.getElementById('<%=SelectedSport.ClientID%>');

    if you are trying to access the control in javascript, then using .ClientID is probably your best bet, as it doesn’t require change in aspx page

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