Changing text color when regular expression validator fails

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Dears,
how can i change text color in a textbox when validation fails

<asp:TextBox ID="txtBankNotes" runat="server">

XML

<asp:RegularExpressionValidator ID="REVBankNotes" runat="server"
           ControlToValidate="txtBankNotes" ErrorMessage="Enter a Number"
           ForeColor="Red" ValidationExpression="^\d+$"></asp:RegularExpressionValidator>

Posted 29-Oct-12 21:11pm

Sandra Ha

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3 solutions

Solution 1

There Is ClientValidationFunction property in Rejex Validation Control

XML

<asp:RegularExpressionValidator ID="REVBankNotes" runat="server"
           ControlToValidate="txtBankNotes" ErrorMessage="Enter a Number" ClientValidationFunction="changeColor" 
           ForeColor="Red" ValidationExpression="^\d+$"></asp:RegularExpressionValidator>

C#

function changeColor(source, args) {
var txtuser = document.getElementById('txtUsername');
var txtpwd = document.getElementById('txtPwd');
var txtfname = document.getElementById('txtfname');
var txtlname = document.getElementById('txtlname');
var strimg = new Array();
strimg = [txtuser, txtpwd, txtfname, txtlname];
if (args.Value == "") {
args.IsValid = false;
document.getElementById(source.id.replace('cv','txt')).style.background = 'orange';
}
else {
args.IsValid = true;
document.getElementById(source.id.replace('cv', 'txt')).style.background = 'white';
}
}

http://www.aspdotnet-suresh.com/2011/01/how-to-change-textbox-background-color.html[^]

http://forums.asp.net/p/1415769/3120520.aspx[^]

Posted 29-Oct-12 21:27pm

vivektiwari97701

Updated 29-Oct-12 21:30pm

v2

Solution 2

Probably following code will help
Write a JS function

JavaScript

function ChangeColor() 
{
  if(!Page_ClientValidate())
  {
   document.getElementById("txtBankNotes").style.color="red";
  }
}

In your submit call this function on onClientClick.

Hope that helps
Milind

Posted 29-Oct-12 21:38pm

MT_

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Sandra Ha · Accepted Answer · 2012-10-29T22:12:00

XML

function WebForm_OnSubmit() {
       if (typeof (ValidatorOnSubmit) == "function" && ValidatorOnSubmit() == false) {
           if (document.getElementById('<%=txtBankNotes.ClientID %>').Validators[1].isvalid == false)
            {
             document.getElementById('<%= txtBankNotes.ClientID %>').style.color = "red";
         }