Can't assign value to variable using subscribe() method in Angular 2

Question

The promise returns a value but I don\'t seem to be assigning the value properly in the subscribe method.

import { Component } from \'@angular/core\';
import {          


        

Answer 1

component context "this" is not available inside of the subscribe(), to fix this, declare _this and assign this before the subscribe() as shown below;

    constructor (private dataService: DataService){
           const _this = this;
           dataService.getCompaniesCount().subscribe(res => {
              this.companyCount = res.count; // does't work
           });
           dataService.getCompaniesCount().subscribe(res => { _this.companyCount = res.count; //works
        });
}