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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
Constraining the Length of Your Entries
You can constrain the character length of all text fields created by <input> or <textarea> by using the minlength and maxlength attributes. A field is invalid if it has a value and that value has fewer characters than the minlength value or more than the maxlength value.
Browsers often don't let the user type a longer value than expected into text fields. A better user experience than ju...