HTMLSlotElement: slotchange event

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

The slotchange event is fired on an HTMLSlotElement instance (<slot> element) when the node(s) contained in that slot change.

Note: The slotchange event doesn't fire if the children of a slotted node change — only if you change (e.g. add or delete) the actual nodes themselves.

In order to trigger a slotchange event, one has to set or remove the slot attribute.

This event is not cancelable.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

js
addEventListener("slotchange", (event) => {});

onslotchange = (event) => {};

Event type

A generic Event.

Examples

js
element.setAttribute("slot", slotName);
// element.assignedSlot = $slot
element.removeAttribute("slot");
// element.assignedSlot = null

The following snippet is taken from our slotchange example (see it live also).

js
let slots = this.shadowRoot.querySelectorAll("slot");
slots[1].addEventListener("slotchange", (e) => {
  let nodes = slots[1].assignedNodes();
  console.log(
    `Element in Slot "${slots[1].name}" changed to "${nodes[0].outerHTML}".`,
  );
});

Here we grab references to all the <slot>s, then add a slotchange event listener to the template's second slot — which is the one which has its contents changed in the example.

Every time the element inserted in the slot changes, we log a report to the console saying which slot has changed, and what the new node inside the slot is.

Specifications

Specification
DOM Standard
# eventdef-htmlslotelement-slotchange
HTML Standard
# handler-onslotchange

Browser compatibility

BCD tables only load in the browser

See also

HTMLSlotElement