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

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
willValidate
77
79
No
No
64
No
77
77
No
55
No
12.0

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https://developer.mozilla.org/en-US/docs/Web/API/ElementInternals/willValidate