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Editorial Team
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Asked: 2026-05-21T06:38:44+00:00

How to call javascript function on keyup event for asp.net’s TextBox control? I am

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How to call javascript function on keyup event for asp.net’s TextBox control? I am trying something like this, but it is not working.

<asp:TextBox ID="txt_userid" runat="server"  onkeyup="GetRes();"></asp:TextBox>

UPDATE


there is a update alert is working but breakpoints in java function is not working.

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1 Answer

  1. Editorial Team

    Test this solution:

    Add this code to your page load:

    txt_userid.Attributes.Add("onkeyup", "GetRes();");

    I don’t say this is best way possible, but it works.

    UPDATE:

    Complete sample:

    ASPX:

    <html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:TextBox ID="txt_userid" runat="server"></asp:TextBox>
    </div>
    </form>
</body>
</html>

    Code behind:

    protected void Page_Load(object sender, EventArgs e)
        {
            txt_userid.Attributes.Add("onkeyup", "alert('hi');");
        }

    Works perfectly. Tested it in IE, Chrome, FireFox.

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