Is there a way to trigger a validator in JavaScript to display an error message?
For instance:
Let's say I have a text box for inputting time and a button to submit the value.
I need to ensure that the time entered is within a certain range, so I am using JavaScript to validate the input and currently displaying an alert if there is an error.
Instead of using the alert, I would like to utilize the validation callout extender to show the error message. Is this possible?
If you haven't already, consider utilizing ASPX validators to address both client-side and server-side validation. This can simplify the process by allowing you to easily check page.IsValid.
ASPX validator controls offer support for regular expressions and custom functions, making them user-friendly. In some cases, you may need to use multiple validators on a single field, such as requiredFieldValidator and Compare validator.
For more information on ASPX validator controls:
Learn about Required Field Validator
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