Chapter 7
Forms
Examples
Recipe 7.1
Populating a Form Field From Local Storage
Use the FormData API to populate a form field with a previously set value in local storage.
Recipe 7.2
Submitting a Form with Fetch and the FormData API
Use the Fetch API to submit a form, adding extra data with the FormData API.
Recipe 7.3
Submitting a Form as JSON
Use the FormData API to transform form data into JSON.
Recipe 7.4
Making a Form Field Required
Mark a form field as required with the "required" attribute.
Recipe 7.5
Constraining a Number Input
Limit the range of values that can be entered into a number input.
Recipe 7.6
Specifying a Validation Pattern
Use a regular expression based validation rule.
Recipe 7.7
Validating Forms
Use the Constraint Validation API to check the validity of form fields.
Recipe 7.8
Using Custom Validation Logic
Use the setCustomValidity function to apply a custom validation message.
Recipe 7.9
Validating a Checkbox Group
Validate that at least one option is selected in a group of checkboxes.
Recipe 7.10
Validating a Field Asynchronously
Perform asynchronous validation with a network request.
