From a91b3874e7454f88712396054920423a68987377 Mon Sep 17 00:00:00 2001 From: Marvin Borner Date: Fri, 9 Apr 2021 19:13:04 +0200 Subject: Initial --- js/utils/loader.js | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 js/utils/loader.js (limited to 'js/utils/loader.js') diff --git a/js/utils/loader.js b/js/utils/loader.js new file mode 100644 index 0000000..58d39ac --- /dev/null +++ b/js/utils/loader.js @@ -0,0 +1,46 @@ +/** + * 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 + const head = document.querySelector( 'head' ); + head.insertBefore( script, head.lastChild ); + +} \ No newline at end of file -- cgit v1.2.3