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