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I can't get this CustomValidator working.

In the <head>:

<script language="javascript" type="text/javascript">
  function ValidateFile(sender, args){
      alert("Hi");

      args.IsValid = document.getElementById("fuFile").value != "" || 
                     document.getElementById("c101_c7").value != "";
  }
</script>

In the body:

<asp:FileUpload ID="fuFile" runat="server" size="70"/>
<asp:TextBox ID="c101_c7" class="textbox" runat="server"/>
<asp:CustomValidator ID="vldFile" runat="server" ClientValidationFunction="ValidateFile"
    ErrorMessage="You must either upload a file or provide a URL of a file."></asp:CustomValidator>

What should be in the args.IsValid if either the FileUpload or TextBox has to be filled in?

I can't get this CustomValidator working.

In the <head>:

<script language="javascript" type="text/javascript">
  function ValidateFile(sender, args){
      alert("Hi");

      args.IsValid = document.getElementById("fuFile").value != "" || 
                     document.getElementById("c101_c7").value != "";
  }
</script>

In the body:

<asp:FileUpload ID="fuFile" runat="server" size="70"/>
<asp:TextBox ID="c101_c7" class="textbox" runat="server"/>
<asp:CustomValidator ID="vldFile" runat="server" ClientValidationFunction="ValidateFile"
    ErrorMessage="You must either upload a file or provide a URL of a file."></asp:CustomValidator>

What should be in the args.IsValid if either the FileUpload or TextBox has to be filled in?

  • asp
  • javascript
  • validation
Share Improve this question edited Apr 8, 2009 at 3:46 Aximili asked Apr 8, 2009 at 3:04 AximiliAximili 29.5k57 gold badges162 silver badges226 bronze badges
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5 Answers 5

Reset to default 5

I find it helpful to actually let the code behind tell your JavaScript code what the client-side ID of the control is, since it's possible it's different than what you would think (based on what ASP .NET decides to do):

document.getElementById('<%=fuFile.ClientID %>');

<script type="text/javascript">
//<![CDATA[
    function validateField(sender, args) {        
        var regExp = /(^[a-zA-Z]{2,50})$/;
        var val = document.getElementById(sender.controltovalidate).value;
        args.IsValid = regExp.test(val);
}
//]]>
</script>

are you just using a normal button to trigger the validation?

Are you implementing validationgroups anywhere else in this code?

You need to set the ControlToValidate Property on the custom validator. Currently the validator is not hooked up to any control.

Also, I'm sure you just didn't post this part of the markup, but you need to have a control that does a postback and causes validation as part of its postback. A button will work for this.

This works

document.getElementById("ctl00_ContentPlaceHolder1_fuFile").value

本文标签： netASPNET CustomValidator client sideStack Overflow

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