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ElementInternals: willValidate property

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.

Elements that are barred from being candidates for constraint validation include those that have the attributes: disabled, hidden or readonly, input elements of type=button or type=reset, or any element that is a <datalist> element or has a <datalist> element ancestor.

Value

true if the element is a candidate for constraint validation, otherwise false.

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.

js

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 98 No 64 16.4 77 77 98 55 16.4 12.0

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