/**
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* @module olcs.contrib.LazyLoader
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*/
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export default class LazyLoader {
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/**
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* @param {string} url
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* @api
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*/
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constructor(url) {
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/**
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* @type {Promise<undefined>}
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* @protected
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*/
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this.promise;
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/**
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* @private
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* @type {string}
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*/
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this.url_ = url;
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}
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/**
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* @return {Promise<undefined>}
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* @api
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*/
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load() {
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if (!this.promise) {
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// not yet loading
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this.promise = new Promise((resolve, reject) => {
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const script = document.createElement('script');
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script.onload = () => resolve();
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script.onerror = () => reject();
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document.head.appendChild(script);
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script.src = this.url_;
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});
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}
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return this.promise;
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}
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}
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