Added `ComponentView.onAttrUpdate` callback

src/dom_components/view/ComponentView.js

@@ -511,8 +511,11 @@ export default Backbone.View.extend({
   renderAttributes() {
     this.updateAttributes();
     this.updateClasses();
+    this.onAttrUpdate();
   },
 
+  onAttrUpdate() {},
+
   render() {
     this.renderAttributes();
     if (this.modelOpt.temporary) return this;