ElementInternals: willValidate property
Baseline 2023Newly available
Since March 2023, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.
- constraint validation.
Elements that are barred from being candidates for constraint validation include those that have the attributes:
disabled,hiddenorreadonly, input elements oftype=buttonortype=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
NotSupportedErrorDOMException-
Thrown if the element does not have its
formAssociatedproperty set totrue.
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 |
|---|
Product helpwillValidate read-only property of the DOMException\nThrown if the element does not have its The following example shows a custom checkbox component with js ariaAtomicariaColCountariaCurrentariaHasPopupariaLevelariaMultiSelectableariaPressedariaRoleDescriptionariaRowSpanariaValueMaxformstatescheckValidity()CustomElementRegistryElement.shadowRootHTMLElement.attachInternals()Node.isConnectedWindow.customElements |