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Editorial Team
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Asked: 2026-05-24T10:51:21+00:00

Here is my code, but it doesn’t work (code behind gets empty string): `

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Here is my code, but it doesn’t work (code behind gets empty string):
` 

<head id="Head1" runat="server">
<title>Pass Javascript Variables to Server</title>
     <script type="text/javascript">             // Second Step
         function f() {
             $("[id$='inpHide']").val("My JavaScript Value");

         }
    </script>
</head>

<body onload="SetHiddenVariable()">
    <form id="form1" runat="server">
    <div>  
        <input id="inpHide" type="hidden" runat="server" />  
        <asp:Button ID="btnJSValue" Text="Click" runat="server" OnClientClick="f"/>
        <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
    </div>
    </form>
</body>

`

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1 Answer

  1. Editorial Team

    There were couple of issues in your code. The parenthesis were missing while calling f function in onClientClick and if the element has id you can just use the id to select it with #

    <head id="Head1" runat="server">
<title>Pass Javascript Variables to Server</title>
     <script type="text/javascript">             // Second Step
         function f() {
             $("input[id*='inpHide']").val("My JavaScript Value");
         }
    </script>
</head>

<body>
    <form id="form1" runat="server">
    <div>  
        <input id="inpHide" type="hidden" runat="server" />  
        <asp:Button ID="btnJSValue" Text="Click" runat="server" OnClientClick="f()"/>
        <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
    </div>
    </form>
</body>
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