如何从Angular ActivatedRoute获取参数 [英] How to get parameters from the Angular ActivatedRoute

问题描述

我正在尝试使用可观察性从激活的路线中获取prameter:id.当我在控制台上打印参数时，我会得到正确的:id值.但是this.id并非如此.我得到的值是NaN.你能告诉我是什么问题吗

I'm trying to get the prameter :id from my activated route using observables. When I print params on the console I get the right values for :id. But it's not the case for this.id. I get the value NaN. Can you tell me what is the problem

export class RecipeEditComponent implements OnInit {
  id: number;
  editMode = false;

  constructor(private route: ActivatedRoute) { }

  ngOnInit() {
    this.route.params.subscribe(
      (params: {id: string}) => {
        this.id = +params.id;
        console.log(this.id);
      }
    );
}
}

推荐答案

更改为 this.id = + params.get('id').

您应该使用方法 get()，因为它为给定的参数 id 返回单个值.您收到错误消息是因为 params 不是以 id 为值的键.

You should use the method get() because it returns a single value for the given parameter id. You were getting an error because params is not a key with id as a value.

export class RecipeEditComponent implements OnInit {
  id: number;
  editMode = false;

  constructor(private route: ActivatedRoute) { }

  ngOnInit() {
  // paramMap replaces params in Angular v4+
   this.route.paramMap.subscribe(params: ParamMap => {
        this.id = +params.get('id');
        console.log(this.id);     
  });
}

这篇关于如何从Angular ActivatedRoute获取参数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！