HTMLSlotElement - Web APIs 编辑

The HTMLSlotElement interface of the Shadow DOM API enables access to the name and assigned nodes of an HTML <slot> element.

Properties

HTMLSlotElement.name

DOMString: Can be used to get and set the slot's name.

Methods

HTMLSlotElement.assignedNodes()

Returns a sequence of the nodes assigned to this slot, and if the flatten option is set to true, the assigned nodes of any other slots that are descendants of this slot. If no assigned nodes are found, it returns the slot's fallback content.

HTMLSlotElement.assignedElements()

Returns a sequence of the elements assigned to this slot (and no other nodes). If the flatten option is set to true, it also returns the assigned elements of any other slots that are descendants of this slot. If no assigned nodes are found, it returns the slot's fallback content.

Events

slotchange

Fired on an HTMLSlotElement instance (<slot> element) when the node(s) contained in that slot change.

Examples

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

let slots = this.shadowRoot.querySelectorAll('slot');
slots[1].addEventListener('slotchange', function(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 slots, then add a slotchange event listener to the 2nd slot in the template — which is the one that keeps having 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

Browser compatibility

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