How can I implement form validation in ASP.NET using JavaScript?

How can I implement form validation in ASP.NET using JavaScript?

You can use JavaScript to validate forms in ASP.NET by adding event listeners to your form elements. This allows you to check user input before the form is submitted.

Can you give me an example of how to validate an email field?

Sure! You can use a regular expression to check if the email format is correct. Here's a simple example:

function validateEmail(email) {
    const regex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return regex.test(email);
}

What if the validation fails?

If the validation fails, you can display an error message to the user and prevent the form from being submitted. You can do this by using event.preventDefault() in your event handler.

Is there a way to validate multiple fields at once?

Yes, you can loop through all the form fields and validate them one by one. If any field fails validation, you can stop the submission and show the relevant error messages.