How do you validate a field that should only contain numbers?

How can you add a custom validation method using the jQuery Validation Plugin?

A). $.validator.custom()

B). $.validator.addMethod()

C). $.validator.newMethod()

D). $.validator.create()

Which method prevents the default form submission if validation fails?

A). submitHandler: function(form)

B). beforeSubmit: function(form)

C). onError: function(form)

D). preventSubmit: function(form)

Which rule ensures that a field must not be left empty?

A). minlength

B). maxlength

C). required

D). email

How can you display all error messages in one place instead of next to each field?

A). Use the errorSummary option

B). Use the errorLabel option

C). Use the errorContainer option

D). Use the errorList option

What is the purpose of the highlight option in jQuery Validation Plugin?

A). To change the color of valid fields

B). To change the color of invalid fields

C). To add a CSS class to valid fields

D). To add a CSS class to invalid fields

What does the equalTo rule validate?

A). Field value must be unique

B). Field value must be a number

C). Field value must match another field

D). Field value must be an email address

How can you prevent a form from being submitted if it is invalid?

A). By using the onsubmit option

B). By using the preventSubmit option

C). By using the blockSubmit option

D). By using the submitHandler option

What is the primary purpose of form validation?

A). Enhance visual design

B). Secure data submission

C). Improve page load speed

D). Reduce server requests

What does the email rule validate in a form field?

A). Field value is a URL

B). Field value is an email address

C). Field value is a number

D). Field value is a date

Which method is used to initialize form validation with the jQuery Validation Plugin?

A). .validate()

B). .check()

C). .verify()

D). .init()