ElementInternals: form property
Baseline 2023
Newly available
Since March 2023, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.
The form
read-only property of the ElementInternals
interface returns the HTMLFormElement
associated with this element.
Value
An HTMLFormElement
.
Examples
The following example shows a custom checkbox component inside a form with an ID of myForm
.
Printing form.length
to the console, gives us the value of HTMLFormElement.length
.
html
<form id="myForm">
<custom-checkbox id="custom-checkbox"></custom-checkbox>
<custom-label for="custom-checkbox">Join newsletter</custom-label>
</form>
js
class CustomCheckbox extends HTMLElement {
static formAssociated = true;
#internals;
constructor() {
super();
this.#internals = this.attachInternals();
}
connectedCallback() {
console.log(this.#internals.form.length);
}
}
window.customElements.define("custom-checkbox", CustomCheckbox);
Specifications
Specification |
---|
HTML Standard # dom-elementinternals-form |
Browser compatibility
BCD tables only load in the browser