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javascriptangularrouter

Angular 2 routing inside a component not working (this.router.navigate not working)

Im trying to develop an angular 2 app that routes to a different component once a specific condition is met, for this i used the this.router.navigate method but it doesnt seem to execute as it keeps showing the "Cannot read property 'navigate' of undefined" error. will appreciate any help on this :)

The specific component

import { Component, OnInit } from '@angular/core';

import { RouterModule, Routes, Router } from '@angular/router';

@Component({
  selector: 'app-searching',
  templateUrl: './searching.component.html',
  styleUrls: ['./searching.component.css']
})
export class SearchingComponent implements OnInit {

constructor(private router:Router) { }

ngOnInit() {
 var elem = document.getElementById("rightSideMovingProgressBar"); 
 var elem2 = document.getElementById("progressText");
 var height = 100;
 var height2 = 0;
 var id = setInterval(frame, 20);
 function frame() {
    if (height <= 0) {
        clearInterval(id);
        this.router.navigate(['/details']);
    } else {
        height--;
        height2++; 
        elem.style.height = height + 'vh';
        elem2.innerHTML = height2 + '%'; 
    }
  } 
}

}

The error

enter image description here

Solution

  • It's because this in the frame is no longer points to the component. Use the following:

     var id = setInterval(()=>{ frame() }, 20);

    Read this and this answers for more information and other possible approaches using bind and bound class properties.