Abstract Class - UI5 & javascript understanding

[emil_lazarski]

Hi Guys,

I am trying to understand & learn some concepts of UI5 and I was going through some tutorials but rather than copying thoughlessly code from tutorials I prefer understanding what is happening below the surface.

One of the examples I encountered was handling the class sap.m.image event press. According to the API reference event is fired, which I handled in a View Controller in a line:

onImagePress: function(oEvent){
            var oSOurce = oEvent.getSource(); 
            var ID = oSOurce.getId();
}

I wanted to get the Source and finally get the ID of the image.

Here unfortunatelly comes my question. According to API reference, getSource of oEvent returns object of class EventProvider:

Although the class is marked in API to be abstract it can be instantiated (according to API ref., which is in contradiction to my understanding of abstract classes).

I was trying to understand where does the availability of method getId come from and tried to debug the Event.js but without any spectacular results. I was hoping that maybe methods like oSOurce.constructor.name could help but not really.

 Event.prototype.getSource = function() {
		return this.oSource;
	}; 

[WouterLemaire]

Try to use TypeScript for your ui5 app. This has the concept of real classes including abstract classes. Here you have the getting started