ElementInternals.willValidate

The willValidate read-only property of the ElementInternals interface returns true if the element is a submittable element that is a candidate for constraint validation.

Syntax

let willValidate = ElementInternals.willValidate;

Value

A boolean value, true if the element is a candidate for constraint validation.

Exceptions

NotSupportedError DOMException

Thrown if the element does not have its formAssociated property set to true.

Examples

The following example shows a custom checkbox component with formAssociated set to true, the value of willValidate is logged to the console.

class CustomCheckbox extends HTMLElement {
  static formAssociated = true;

  constructor() {
    super();
    this.internals_ = this.attachInternals();

    /* ... */

  }
  window.customElements.define("custom-checkbox", CustomCheckbox);
})();

let element = document.getElementById("custom-checkbox");
console.log(element.internals_.willValidate); // true

Specifications

Specification
HTML Standard (HTML)
# dom-elementinternals-willvalidate

Browser compatibility

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