Question

RequiredFieldValidator Validation Control ASP.NET 3.5

Asked by: accessloans

I am using a RequiredFieldValidator validation control in VWD 2008. The validator works fine firing when no data is typed into the textboxes and dropdownlists. I would like the textbox or dropdownlists border to change colour to red if the validator returns a false values as well as showing the text property of the validator. I have looked online for help but havent found anything. Im using VB.Net.

Thanks in advance.

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Asked On
2008-03-05 at 16:06:24ID23218025
Topics

Programming for ASP.NET

,

WebApplications

,

Visual Studio

Participating Experts
2
Points
250
Comments
3

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Answers

 

by: vavjeevaPosted on 2008-03-05 at 17:16:56ID: 21056463

i beleive, that functionality is not built into the ASP.NET validators. You can do it if you only use server side validation. That way, you can post back to do validation. Then in your post back event handler, do this:

Label1.ForeColor = Color.Black

If Not Page.IsValid Then

   If Not Validator1.IsValid Then

      Label1.ForeColor = Color.Red

   End If

End If

or you can check this article

http://www.codeproject.com/KB/validation/highlight_validators.aspx

 

by: l-cmPosted on 2008-03-05 at 23:54:32ID: 21058202

You can avoid making unnecessary server side calls by using a custom validator and setting the control properties through javascript.

function validateTextBox(source, args) {
    var textbox = document.getElementById("TextBox1");
    
    var valid = true;
    if(textbox.value.length == 0)
    {
        textbox.style.borderColor = "red";
        valid = false;
    }
 
    args.IsValid = valid;
}
 
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="CustomValidator" ClientValidationFunction="validateTextBox" ControlToValidate="TextBox1" ValidateEmptyText="True" ValidationGroup="validateText">Error</asp:CustomValidator>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><asp:Button ID="Button1"
            runat="server" Text="Button" ValidationGroup="validateText" />
                                              
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by: l-cmPosted on 2008-03-11 at 07:57:39ID: 21096301

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