Breaking out javascript into js files instead of inline

app/components/bikes/javascripts/init_component.js

@@ -0,0 +1,13 @@
+{
+  initComponent: function(){
+    // calling superclass's initComponent
+    this.callParent();
+
+    // setting the 'rowclick' event
+    var view = this.getView();
+    view.on('itemclick', function(view, record){
+      // The beauty of using Ext.Direct: calling 3 endpoints in a row, which results in a single call to the server!
+      this.selectBikeBrand({bike_brand_id: record.get('bike_brand__brand')});
+    }, this);
+  }
+}