TextChange in repeater nativescript - nativescript

Question

i trying do to textchange in repeater and research this link.
Basic blur event in a Telerik Nativescript Mobile App
It work in single textfield but no work in repeater. Isn't set wrong anything?
XML：
<Repeater id="lstSelectedItemsSingle" items="{{itemsSingle}}">
<Repeater.itemTemplate>
<GridLayout columns="auto,*,auto,*,auto" rows="auto,auto,1" padding="6" id = "{{ matchId + dataType + 'GridSingle'}}">
<GridLayout columns="*,*,*" rows="40" col="3" borderRadius="6" borderWidth="1" borderColor="#DBDBDB" >
<button backgroundImage="res://reduce_enable" style="background-repeat:no-repeat;background-position: 50% 50%" backgroundColor="#BFBFBF" />
<TextField col="1" backgroundColor="#ffffff" col="1" text="{{stake}}" style="text-align:center" keyboardType="number" />
<button backgroundImage="res://add_icon_enable" col="2" style="background-repeat:no-repeat;background-position: 50% 50%" backgroundColor="#BFBFBF" col="2"/>
</GridLayout>
</GridLayout>
</Repeater.itemTemplate>
</Repeater>
Model：
exports.onPageLoaded = function(args){
page = args.object;
viewM.set("stake", "2");
viewM.addEventListener(observable.Observable.propertyChangeEvent, function (event) {
console.log(event.propertyName);
}
});
}

Answer 1

It's probably because repeaters are bound to a list of items - usually observables. If you bind inside the repeater using "{{ }}", NativeScript is going to look for that method on that specific object in the repeater. So your code should be structured something like this (TypeScript) ...
import { Observable, EventData } from 'data/observable';
import { Page } from 'ui/page';
class Item extends Observable({
text: string = '';
constructor(text: string) {
this.text = text;
this.todos.on(ObservableArray.changeEvent, (args: any) => {
// handle text change
});
}
});
class ViewModel extends Observable({
items: ObservableArray<Items>
constructor() {
this.items = new ObservableArray<Items>({
new Item('Thing 1'),
new Item('Thing 2')
});
}
});
let loaded = (args: EventData) => {
let page = <Page>args.object;
page.bindingContext = new ViewModel();
}
export { loaded }