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- 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
The Constraint Validation API
The Constraint Validation API consists of a set of methods and properties available on the following form element DOM interfaces:
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HTMLButtonElement (represents a <button> element)
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HTMLFieldSetElement (represents a <fieldset> element)
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HTMLInputElement (represents an <input> element)
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HTMLOutputElement (represents an <output> element)
- **HTMLSelectEl...