Form Validation

Abstract

In this chapter we’ll see different ways of validating forms. We will be covering following recipes, from basic blank-field checking through to more complex password and field-disabling techniques:

• Confirming a required field is not left blank

• Validating a numerical field

• Validating phone numbers

• Validating a user ID

• Validating a date

• Validating an email address

• Checking whether a checkbox is checked

• Finding whether a radio button is selected

• Checking whether an option in a select element is selected

• Applying styles to options and a form button

• Checking and unchecking all checkboxes together

• Validating two fields

• Matching the password and confirm password fields

• Disabling certain fields

• Validating a complete form

• Serializing form data