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Asked: 2026-05-11T10:49:24+00:00

I would like to use a Validator to guarantee that a given textbox’s submitted

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I would like to use a Validator to guarantee that a given textbox’s submitted content is unique. I want to make sure that the name put into the box is not the same as any other text box.

The catch is I don’t know at compile time how many other text boxes it will be compared to. It could be anywhere from 0 – n other name text boxes.

Thanks for any help you can give.

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  1. If you want to do it on the client, a simple way, though maybe not the best one is something like this:

    <html xmlns='http://www.w3.org/1999/xhtml' > <head runat='server'>     <title></title>     <script type='text/javascript'>         function CheckUnique(sender, args) {             var inputArray = document.getElementsByTagName('input');             for (var i = 0; i < inputArray.length; i++) {                 if (inputArray[i].type == 'text' && inputArray[i].id != 'TextBox1' && inputArray[i].value == args.Value) {                     args.IsValid = false;                     return;                 }             }         }     </script> </head> <body>     <form id='form1' runat='server'>     <div>         <asp:CustomValidator ID='CustomValidator1' runat='server' ControlToValidate='TextBox1' ErrorMessage='CustomValidator' ClientValidationFunction='CheckUnique'></asp:CustomValidator>         <asp:TextBox ID='TextBox1' runat='server'></asp:TextBox>         <asp:TextBox ID='TextBox2' runat='server'></asp:TextBox>         <asp:TextBox ID='TextBox3' runat='server'></asp:TextBox>         <asp:Button ID='Button1' runat='server' Text='Button' />     </div>     </form> </body> </html>
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