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 # dom-elementinternals-form |
Browser compatibility
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