56 lines
1.7 KiB
TypeScript
56 lines
1.7 KiB
TypeScript
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// Copyright (C) 2020 Storj Labs, Inc.
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// See LICENSE for copying information.
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/**
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* LoadScript is an utility for loading scripts.
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*/
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export class LoadScript {
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public readonly head : HTMLHeadElement = document.head;
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public readonly script: HTMLScriptElement = document.createElement('script');
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/**
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* Create script element with some predefined attributes, appends it to a DOM and start loading script.
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* @param url - script url.
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* @param onSuccess - this callback will be fired when load finished.
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* @param onError - this callback will be fired when error occurred.
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*/
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public constructor(url: string, onSuccess: LoadScriptOnSuccessCallback, onError: LoadScriptOnErrorCallback) {
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this.head = document.head;
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this.script = document.createElement('script');
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this.script.type = 'text/javascript';
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this.script.charset = 'utf8';
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this.script.async = true;
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this.script.src = url;
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this.script.onload = () => {
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this.script.onerror = null;
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onSuccess();
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};
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this.script.onerror = () => {
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this.script.onerror = null;
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onError(new Error('Failed to load ' + this.script.src));
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};
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this.head.appendChild(this.script);
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}
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/**
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* Removes script element from DOM.
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*/
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public remove(): void {
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this.head.removeChild(this.script);
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}
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}
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/**
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* LoadScriptOnSuccessCallback describes signature of onSuccess callback.
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*/
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export type LoadScriptOnSuccessCallback = () => void;
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/**
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* LoadScriptOnErrorCallback describes signature of onError callback.
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* @param err - error occurred during script loading.
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*/
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export type LoadScriptOnErrorCallback = (err: Error) => { };
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