39 lines
1.1 KiB
JavaScript
39 lines
1.1 KiB
JavaScript
/**
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* Loads a JavaScript file from the given URL and executes it.
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*
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* @param {string} url Address of the .js file to load
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* @param {function} callback Method to invoke when the script
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* has loaded and executed
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*/
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export const loadScript = (url, callback) => {
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const script = document.createElement("script");
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script.type = "text/javascript";
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script.async = false;
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script.defer = false;
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script.src = url;
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if (typeof callback === "function") {
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// Success callback
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script.onload = script.onreadystatechange = (event) => {
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if (event.type === "load" || /loaded|complete/.test(script.readyState)) {
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// Kill event listeners
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script.onload = script.onreadystatechange = script.onerror = null;
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callback();
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}
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};
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// Error callback
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script.onerror = (err) => {
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// Kill event listeners
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script.onload = script.onreadystatechange = script.onerror = null;
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callback(new Error("Failed loading script: " + script.src + "\n" + err));
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};
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}
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// Append the script at the end of <head>
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const head = document.querySelector("head");
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head.insertBefore(script, head.lastChild);
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};
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