feat(geschichte): Add

1 files changed, 46 insertions, 0 deletions

diff --git a/geschichte/js/utils/loader.js b/geschichte/js/utils/loader.js
new file mode 100644
index 0000000..58d39ac
--- /dev/null
+++ b/geschichte/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 <head>
+	const head = document.querySelector( 'head' );
+	head.insertBefore( script, head.lastChild );
+
+}
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