IDs in JS Fragments

The fragment logic of JS fragments cannot influence the IDs of controls that are created in the createContent() method.

This behavior is similar to how JS views behave regarding IDs. When a stable ID is given within a JS fragment, the this.createId() method should be used:

createContent: function(oController ) {
	var oButton  = new sap.ui.commons.Button(this.createId("btnInJsFragment"), { 
	// use createId() to let the fragment influence the ID
	    text: "Hello JS World"
	}); 
	return oButton ; 
}

If an ID is given when the fragment is instantiated, createId() will add it as prefix. Else, createId() will leave the given ID untouched.

It is, however, possible that a containing view may add its prefix. For more information, see IDs of Fragments in Views.