openui5 getBinding() returning undefined

0
votes

I am trying to listen to an event that indicates a custom control's aggregation binding has changed.

My goal is to locate the binding object associated with the aggregation and attach a handler to it.

I understand that binding occurs within onBeforeRendering, so I added an onAfterRendering function which is called successfully

However this.getBinding("_myAggregation") is still undefined, so that I cannot attach any event handler. The outline of the code is as follows:

sap.ui.core.Control.extend("myControl",
		{
			metadata : {
				properties : {
				...
				},
				aggregations : {
					_myAggregation : {
						type : "myInnerControl",
						multiple : false
					}
				},
				events : {
				...
				}
			},
			init : function() {
				var self = this;
				self.setAggregation("_myAggregation", new myInnerControl.bindElement("queryModel>"));
			},
			onAfterRendering : function(oEvent) {
				if (sap.ui.core.Control.prototype.onAfterRendering) { 
					sap.ui.core.Control.prototype.onAfterRendering.apply(this, arguments);
				}
				this.getBinding("_myAggregation").attachChange(function() {
					alert("model change");
				});
			},
			renderer : function(oRm, oControl) {
				...
			}
		});

I am using openui5 version 1.28.15 The application works otherwise: correctly renders the information in the JSONModel, handles edits etc.

1
javascriptsapui5

1 Answers

0
votes

Hope this might help you.

http://jsbin.com/qagani/edit?html,js,output

The binding is more related to Managed Object rather than control itself.