Hello, I'm looking at the demo (https://demos.telerik.com/aspnet-ajax/textbox/functionality/validation/defaultvb.aspx) but it doesn't work as it implies it does / as I would expect it to. It seems to wait until I click the "Postback" button before it does any client-side validation, which to me, is too late. Shouldn't the validation happen when the user tabs through a required field leaving it blank, for example?
Weirdly, after the Postback, entering data into the missing field hides the Validation Error Message, and also clearing the data in the field shows the Validation Error Message. Why does it not do this before the first Postback?
After much searching, I found this doc (https://docs.telerik.com/devtools/aspnet-ajax/general-information/troubleshooting/jquery-troubleshooting) and couldn't get the Unobtrusive Validation stuff to work on my own, as the article primarily covers, so I just added the "disable" line near the top in the web.config in my own project, and now my project behaves like the demo. But that doesn't really explain why your demo doesn't behave consistently, anyway.
3 Answers, 1 is accepted
Hi Wally,
The default client-side validation is fired when the control loses focus and its value has been changed, see Triggering validation.
Therefore tabbing through not valid controls without changing their value will not fire the validation. If you tab out of a control after changing its value then the validation will fire, see http://somup.com/cYitIx6lFy
If you want to change or extend the default validation behavior you may apply some custom JavaScript to fire the validation initially on page load or to force it on blur event no matter if the control value has been changed.
- Validation - RequiredFieldValidator
- ASP.NET: How to trigger the client-side validation manually
- You may also consider using custom validators, see CustomValidator.ClientValidationFunction Property
I hope this will prove helpful!
Kind regards,
Doncho
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