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Editorial Team
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Asked: 2026-06-05T00:30:15+00:00

I am having some problem with OnClientClick. I added a button into my webform

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I am having some problem with OnClientClick.

I added a button into my webform like this.

<asp:Button ID="Button1" runat="server" onclick="Button1_Click" 
        style="top: 307px; left: 187px; position: absolute; height: 26px; width: 90px" 
        Text="Submit" OnClientClick="return validate()" />

And i am writing a javascript inside <head>immediately after the <title>.

<script language="javascript" type="text/javascript">
    function validate() {
        if (document.getElementById("<%=TextBox1%>").value == "") {
        alert("textbox1 should not be empty");
        }
        else if(document.getElementById("<%=TextBox2 %>").value==""){
        alert("textbox2 should not be empty");
        }
                        }
</script>

TextBox1andTextBox2 are the Id’s of two textboxes.

But when i click on Submit button, OnClick is firing but OnClientClick is not firing.

Whats the problem ?

Please help.

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1 Answer

  1. Editorial Team

    When taking the ID from the textboxes, you’ll have to use <%=TextBox1.ClientID%> in your javascript.

    And you should also return false from the validate-function when an error occurs.

    Replace your javascript with:

    function validate() {
    if(document.getElementById('<%=TextBox1.ClientID%>').value == '') {
        alert('Textbox1 should not be empty');
        return false;
    }
    if(document.getElementById('<%=TextBox2.ClientID%>').value == '') {
        alert('Textbox2 should not be empty');
        return false;
    }
}
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