Change textbox's css class when ASP.NET Validation fails
How can I execute some javascript when a Required Field Validator attached to a textbox fails client-side validation? What I am trying to do is change the css class of the textbox, to make the textbox's border show red.
I am using webforms and I do have the jquery library available to me.
Solution 1:
Here is quick and dirty thing (but it works!)
<form id="form1" runat="server">
<asp:TextBox ID="txtOne" runat="server" />
<asp:RequiredFieldValidator ID="rfv" runat="server"
ControlToValidate="txtOne" Text="SomeText 1" />
<asp:TextBox ID="txtTwo" runat="server" />
<asp:RequiredFieldValidator ID="rfv2" runat="server"
ControlToValidate="txtTwo" Text="SomeText 2" />
<asp:Button ID="btnOne" runat="server" OnClientClick="return BtnClick();"
Text="Click" CausesValidation="true" />
</form>
<script type="text/javascript">
function BtnClick() {
//var v1 = "#<%= rfv.ClientID %>";
//var v2 = "#<%= rfv2.ClientID %>";
var val = Page_ClientValidate();
if (!val) {
var i = 0;
for (; i < Page_Validators.length; i++) {
if (!Page_Validators[i].isvalid) {
$("#" + Page_Validators[i].controltovalidate)
.css("background-color", "red");
}
}
}
return val;
}
</script>
Solution 2:
You could use the following script:
<script>
$(function(){
if (typeof ValidatorUpdateDisplay != 'undefined') {
var originalValidatorUpdateDisplay = ValidatorUpdateDisplay;
ValidatorUpdateDisplay = function (val) {
if (!val.isvalid) {
$("#" + val.controltovalidate).css("border", "2px solid red");
}
originalValidatorUpdateDisplay(val);
}
}
});
</script>
This code decorates the original ValidatorUpdateDisplay function responsible for updating the display of your validators, updating the controltovalidate as necessary.
Hope this helps,
Solution 3:
I think you would want to use a Custom Validator and then use the ClientValidationFunction... Unless it helpfully adds a css class upon fail.