GlobalEventHandlers.onslotchange
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The onslotchange
property of the GlobalEventHandlers
mixin is an event handler that processes slotchange
events.
The slotchange
event is fired on HTMLSlotElement
instances (<slot>
elements) when the node(s) contained in the slot change.
Examples
The following snippet is a slightly modified version of our slotchange example which uses onslotchange
rather than adding a listener for the slotchange
event.
First the code gets an array of all the <slot>
s and then assigns a handler function to the onslotchange
property on the template's second slot — this second slot is the one that has its contents changed in the example.
Every time the element 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.
let slots = this.shadowRoot.querySelectorAll('slot');
slots[1].onslotchange = function(e) {
let nodes = slots[1].assignedNodes();
console.log('Element in Slot "' + slots[1].name + '" changed to "' + nodes[0].outerHTML + '".');
};
We might alternatively handle the event at a higher level.
The snippet below shows the equivalent code if the handler is assigned to onslotchange
on the shadowRoot
.
Every time the element in any slot changes, we log a report to the console saying which slot has changed, and what the new node inside the slot is.
this.shadowRoot.onslotchange = function(e) {
const nodes = e.originalTarget.assignedNodes();
console.log(`Element in Slot "${e.originalTarget.name}" changed to "${nodes[0].outerHTML}".`);
};
Specifications
Specification |
---|
HTML Standard # handler-onslotchange |
Browser compatibility
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