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Implement the 'required' check box field validator Use the Check box field and mark it as required. Create a custom validator for the Check box field.

A checkbox usually has two states: checked and unchecked. But indeterminate checkboxes are in a third state: neither checked nor unchecked. The ?checkedness? is not determined. You have seen these before. The most common reason to have an indeterminate checkbox is when it is controlling a set of checkboxes.

The Input Checkbox required property in HTML DOM is used to set or return whether the input checkbox field should be checked or not before submitting the form. This property is used to reflect the HTML required attribute. Syntax: It returns the Input Checkbox required property.

There are two types of variation checkboxes: single checkboxes and multi-checkboxes: Single checkboxes can be used for yes/no options, and to prompt conditional logic choices (e.g. showing additional options when the customer ticks a box).

Therefore it's required to create a useEffect handler that is responsible for doing this. // snippet const {indeterminate} = props; const cRef = useRef(); useEffect(() => { cRef. current. indeterminate = indeterminate; }, [cRef, indeterminate]);

Checkboxes actually has three states: true, false and indeterminate which indicates that a checkbox is neither "on" or "off". A checkbox cannot be set to indeterminate state by an HTML attribute - it must be set by a JavaScript. This state can be used to force the user to check or uncheck the checkbox.

Checkboxes cannot be set to readonly using standard HTML attributes. However, alternative approaches like using the disabled attribute or CSS properties like pointer-events can mimic the read-only behavior for checkboxes.

The :indeterminate CSS pseudo-class represents any form element whose state is indeterminate, such as checkboxes which have their HTML indeterminate attribute set to true , radio buttons which are members of a group in which all radio buttons are unchecked, and indeterminate <progress> elements.