How to change aggregation binding path dynamically when pressing a button - sapui5

Question

<mvc:View xmlns:mvc="sap.ui.core.mvc"
xmlns="sap.m"
xmlns:core="sap.ui.core"
controllerName="z.controller.Main">
<Page id="page" title="ComboBox" >
<content>
<ComboBox name="Drop-down List" id="box0" items="{/country}">
<items >
<core:Item key="{Key}" text="{Name}" id="item0"/>
</items>
</ComboBox>
</content>
<Button text="Change" press="onChange"/>
</Page>
</mvc:View>
model1.json
{
"country": [{
"Key": "IN",
"Name": "India"
},
{
"Key": "US",
"Name": "USA"
},{
"Key": "UK",
"Name": "United Kingdom"
}]
}
model2.json
{
"country2": [{
"Key": "BD",
"Name": "Bangladesh"
},
{
"Key": "CA",
"Name": "Canada"
},{
"Key": "FR",
"Name": "France"
}]
}
Main.controller.js
sap.ui.define([
'sap/ui/core/mvc/Controller',
"sap/ui/model/json/JSONModel",
"z/models/model"
], function(Controller,JSONModel, localModel) {
'use strict';
return Controller.extend("z.controller.Main",{
onInit: function(){
var oModel = localModel.createJSONModel("models/data/model1.json");
sap.ui.getCore().setModel(oModel);
var oModel2 = localModel.createJSONModel("models/data/model2.json");
sap.ui.getCore().setModel(oModel2, "model2");
},
onChange: function(){
}
})
});
controller.js
sap.ui.define([
'sap/ui/core/mvc/Controller',
"sap/ui/model/json/JSONModel"
], function(Controller,JSONModel) {
'use strict';
return {
createJSONModel: function(filePath){
var oModel = new JSONModel();
oModel.loadData(filePath);
return oModel;
}
}
});
I have two JSON models and building a combo list using aggregation binding(items="{/country}") by reading data from model1. I am trying to fill the same Combolist by reading the data from the model2 on a button press event.

Answer 1

You can switch the model by using it as a prefix model2> (as you have defined in the Main.controller.js in the onInit method) in the binding path:
onChange: function() {
var oComboBox = this.getView().byId("box0");
oComboBox.bindItems("model2>/country2", {
template: this.getView().byId("item0")
});
}
And change the aggregation from items to dependents.
<ComboBox name="Drop-down List" id="box0" items="{/country}">
<dependents>
<core:Item key="{Key}" text="{Name}" id="item0"/>
</dependents>
</ComboBox>