Bummer! This is just a preview. You need to be signed in with an account to view the entire instruction.
- Client-side form validation
- Using Built-in Form Validation
- The Required Attribute
- Validating Against a Regular Expression
- Constraining the Length of Your Entries
- Full Example
- The Constraint Validation API
- Implementing a Customized Error Message
- A More Detailed Example
- Validating Forms Without a Built-in API
- Form Validation Quiz 6 questions
Well done!
You have completed (UPI) Chapter 10: Utilizing Forms with JavaScript!
Instruction
Implementing a Customized Error Message
As you saw in the HTML validation constraint examples earlier, each time a user tries to submit an invalid form, the browser displays an error message. The way this message is displayed depends on the browser.
These automated messages have two drawbacks:
- There is no standard way to change their look and feel with CSS.
- They depend on the browser locale, which means that you can ha...