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Editorial Team
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Asked: 2026-05-27T12:21:09+00:00

I have a textbox and a submit button. I want to validate a textbox

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I have a textbox and a submit button.

I want to validate a textbox whether it is empty or not using javascript and not validator controls like RequiredFeildValidator in asp.net. i.e i want to do client side validation.

Please guide me how to do it using javascript,any tutorials will be great help.

Here are my asp controls

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
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1 Answer

  1. Editorial Team

    You can have the onClick run a javascript function to check the length of the value in the text box. A link on how to set up the onclick, if you have any questions…

    http://www.w3schools.com/js/js_events.asp

    Also, remember that it is best practice to have scripts in the <head> tag.

    <script type="text/javascript" charset="utf-8">
    function validateBox1(){
        var text = document.getElementById('TextBox1');
        if(text.value.length == 0){
            //handle validation response here
        } else {
            //submit form, or whatever the button is supposed to do...
        }
    }
</script>
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