typescript - `this` in callback points to wrong object -


i have viewmodel:

import app = require("durandal/app"); import appviewmodel = require("appviewmodel"); import dataservice = require("dataservice");  class home{     section = ko.observable<string>();     activescreen = ko.observable<string>("nativelanguage/selectnativelanguage");  constructor() {     app.on('home:activateview').then(this.activateview); }  activateview(view) {     this.activescreen(view); }  activate() {     return this.getsection(); }  getsection() {     return dataservice.getsection('home_page').then((data) => {         this.section(data.results[0]);     }); } } export = home;

this compiles without error.

however, when runs, , activateview called callback, this pointing app not home activescreen property undefined.

how resolve this?

since passing function else call in .then(this.activateview); need preserve context yourself, best if : .then((view)=>this.activateview(view));

more this : https://www.youtube.com/watch?v=tvocucbcupa


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