I've seen a lot of questions about this already, but I'm stumped! Please help!
I have a customvalidator. It's firing but it's not preventing postback. Please help me in doing so! I can see that console.log registers before the post. But, it posts back anyway. How do I prevent the postback?
I've tried adding a control to validate, and validate empty text equal to true. I also tried adding e.preventdefault, which did not work :(
How can I prevent the postback?
<script type="text/javascript">
//<![CDATA[
function validateWhyUnlikely(source, args) {
console.log(1);
args.isValid = false;
}
//]]>
<asp:TextBox ID="txtWhyUnlikely" runat="server" Rows="4" cols="20"
CssClass="surveyTextArea" />
<asp:CustomValidator runat="server" ID="cfvWhyUnlikley" ErrorMessage="Please provide a reason since you rated an item as unlikely to provide."
CssClass="surveyError surveySmallIndent" Display="Dynamic"
ClientValidationFunction="validateWhyUnlikely" />
<asp:Button ID="btnSubmit" runat="server" Text="Submit" CssClass="smallSpecial" OnClick="btnSubmit_Click" />
jQuery(document).ready(function () {
jQuery('#<%= btnSubmit.ClientID %>').click(function (e) {
if (Page.IsValid == false) {
console.log(false);
e.preventDefault();
return false;
}
});
});
Everything looks ok althought I am not sure why you are attaching the Click
function to your submit button. I would remove that and test it as it maybe be overriding the default behavior.
Also I think you need to capitalize the IsValid
property:
args.IsValid = false;
I too faced this issue, I was trying to add a custom validator to a dropdownlist which had a selectedIndexChange
event attached to it. After i gave incorrect value for dropdown, i was able to se ethe error message i gave in Custom Validator but immediately after it Postback was happening.
However on adding this property CausesValidation="true"
to the dropdownlist control resolved my issue.
Postback wasn't happening on incorrect value after adding this property to my dropdown.
If it helps other people, I had a Validation group that I forgot to add the button to.
Make sure to add the button, the textbox and the validator to the same validation group for the postback to be prevented.
I experienced this problem as well.
What I did was, in the C# procedure that was called by the button, at the top I added
if (IsValid == false)
return;
I could not stop it performing the postback so this seemed to me like the only solution.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With