nativescript - Button tap callback -

i've got in xml file

<button id="info-button" text="test" tap="{{ oninfotap }}" />

on tapping want call method in context object.

i'm getting compile time warning of:

js: binding: property: 'oninfotap' invalid or not exist. sourceproperty: 'oninfotap'

it's 1-way callback - not property. if remove double curly braces don't callback context object.

help!

are using mvvm structure? if so, can define tap listener button on model page calls function in viewmodel:

in xml:

<button tap="oninfotap" /> 

in .js file:

export function oninfotap(args) {     // example, pageviewmodel page binding context object     pageviewmodel.yourfunction(); } 

in viewmodel:

class pageviewmodel extends observable {     public yourfunction() {         // code here     } } 

this i'm used do. if don't want remove curly braces, suggest this:

class pageviewmodel extends observable {     public yourfunction() {         // code here     }     this.set("oninfotap", yourfunction); } 

if these things don't you, please post more code can understand clearer.