CODEWITHSUNDEEP
angular
user7216260
user7216260

Reputation:

Cannot read property 'queryParams' of undefined

I'm trying to get the query parameters from the url (using Angular 5):

import { Component, OnInit, OnDestroy } from '@angular/core';
import { ActivatedRoute, Router } from '@angular/router';

@Component({
    selector: 'app-shop',
    templateUrl: './shop.component.html'
})

export class ShopComponent implements OnInit {
    constructor(private route: ActivatedRoute, private router: Router) { }

    ngOnInit() {
        private sub: any;

        private keyword: string;

        this.sub = this.route.queryParams.subscribe(params => {
            this.keyword = params['keyword'] || null;
        });

        console.log(this.keyword);
    }

    ngOnDestroy() {
        this.sub.unsubscribe();
    }
}

I get the following error in the console log:

shop.component.ts:18 Uncaught TypeError: Cannot read property 'queryParams' of undefined

Upvotes: 3

Views: 7228

Answers (2)

user7216260
user7216260

Reputation:

It turned out, that I've set the private variables inside the ngOnInit(), which was causing the error. Huh...!

Upvotes: 1

Gregor Doroschenko
Gregor Doroschenko

Reputation: 11696

Try to remove this.sub = from accessing to route. Also you can try to accees to query params via dot:

this.route.queryParams.subscribe(params => {
  this.keyword = params.keyword || null;
});

Upvotes: 0

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