@lit/reactive-element
Version:
70 lines • 2.47 kB
JavaScript
/**
* @license
* Copyright 2021 Google LLC
* SPDX-License-Identifier: BSD-3-Clause
*/
var _a;
/*
* IMPORTANT: For compatibility with tsickle and the Closure JS compiler, all
* property decorators (but not class decorators) in this file that have
* an @ExportDecoratedItems annotation must be defined as a regular function,
* not an arrow function.
*/
import { decorateProperty } from './base.js';
/**
* A tiny module scoped polyfill for HTMLSlotElement.assignedElements.
*/
const slotAssignedElements = ((_a = window.HTMLSlotElement) === null || _a === void 0 ? void 0 : _a.prototype.assignedElements) != null
? (slot, opts) => slot.assignedElements(opts)
: (slot, opts) => slot
.assignedNodes(opts)
.filter((node) => node.nodeType === Node.ELEMENT_NODE);
/**
* A property decorator that converts a class property into a getter that
* returns the `assignedElements` of the given `slot`. Provides a declarative
* way to use
* [`HTMLSlotElement.assignedElements`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLSlotElement/assignedElements).
*
* Can be passed an optional {@linkcode QueryAssignedElementsOptions} object.
*
* Example usage:
* ```ts
* class MyElement {
* @queryAssignedElements({ slot: 'list' })
* listItems!: Array<HTMLElement>;
* @queryAssignedElements()
* unnamedSlotEls!: Array<HTMLElement>;
*
* render() {
* return html`
* <slot name="list"></slot>
* <slot></slot>
* `;
* }
* }
* ```
*
* Note, the type of this property should be annotated as `Array<HTMLElement>`.
*
* @category Decorator
*/
export function queryAssignedElements(options) {
const { slot, selector } = options !== null && options !== void 0 ? options : {};
return decorateProperty({
descriptor: (_name) => ({
get() {
var _a;
const slotSelector = `slot${slot ? `[name=${slot}]` : ':not([name])'}`;
const slotEl = (_a = this.renderRoot) === null || _a === void 0 ? void 0 : _a.querySelector(slotSelector);
const elements = slotEl != null ? slotAssignedElements(slotEl, options) : [];
if (selector) {
return elements.filter((node) => node.matches(selector));
}
return elements;
},
enumerable: true,
configurable: true,
}),
});
}
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