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如何访问另一个组件中一个组件的变量[角度]

typescript angular

0

Tanzeel · 技术社区 · 6 年前

我是新来的。我今天要做一件简单的事。我已经看过许多答案,但不能正确地执行它们。我想访问 filter-panel 在里面 filter-bar ,(我的两个自定义组件)。但两者都不是亲子关系。它们是独立的,虽然在同一个目录中。在这里我创建了一个 stackblitz . 这是我的密码:

过滤器-面板.component.ts

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

@Component({
    ...
})
export class FilterPanelComponent implements OnInit {

public activeFilters: string[];
public text: string="hello world";

constructor() {
    this.activeFilters = [
        'Apple',
        'Grapes',
        'Bana'
    ];
}

ngOnInit() {}

}

import { Component, OnInit, ViewChild } from '@angular/core';
import { FilterPanelComponent } from './filter-panel/filter-panel.component';

@Component({
    ...
})
export class FilterBarComponent implements OnInit {

    @ViewChild('FilterPanelComponent', {static : false}) filterPanel: FilterPanelComponent;

    public values1: string[] = ['Philips'];

    public values2: string[];

    constructor() {
      //this.values2=this.filterPanel.activeFilters;  
    }

    ngOnInit() {
        //console.log(this.values2);
    }
}

在做了更多的研究之后,我意识到使用它是毫无意义的 @ViewChild 在这种情况下。所以我试着做了个服务。我试过了 @Input() . 我也试过这个: How to use a variable from a component in another in Angular2

2 回复 | 直到 6 年前

1

2

Maniraj Murugan 6 年前

一个新的服务叫做, filter-panel.service.ts setter() getter()

import { Injectable } from '@angular/core';

@Injectable()
export class FilterPanelService {

  filterdata: any[];
  constructor() { }

   get data(): any{
    return this.filterdata;
  }

  set data(val: any){
    this.filterdata = val;
    console.log(this.filterdata);
  }

}

在 filter-panel.component.ts 将值设置为,

export class FilterPanelComponent implements OnInit {

    public activeFilters: string[];
    public text: string="hello world";

    constructor(public filterPanelService:FilterPanelService) {

        this.activeFilters = [
            'Provider: CMS',
            'Region: All',
            'Provider Group:All',
            'Provider: CMS',
            'Region: All',
            'Provider Group: All'
        ];

        this.filterPanelService.data = this.activeFilters;
    }

    ngOnInit() {}
}

而且在 filter-bar.component.ts

export class FilterBarComponent implements OnInit {
    @ViewChild('FilterPanelComponent', {static : false}) filterPanel: FilterPanelComponent;


    public values1: string[] = ['Philips'];

    public values2: string[];


    constructor(public filterPanelService: FilterPanelService) {

      //this.values2=this.filterPanel.activeFilters;  
    }

    ngOnInit() {
        //console.log(this.values2);
        console.log('value received ', this.filterPanelService.data);
    }
}

Working Stackblitz..

2

1

Yash Rami 6 年前

如果两个组件都没有父子关系,并且您希望在它们之间传递数据,那么您可以实现 RxJS 同样的主题。希望对你有帮助

消息服务

import { Injectable } from '@angular/core';
import { Observable, Subject } from 'rxjs';

@Injectable({ providedIn: 'root' })
export class MessageService {
    private subject = new Subject<any>();

    sendMessage(message: string) {
        this.subject.next({ text: message });
    }

    clearMessages() {
        this.subject.next();
    }

    getMessage(): Observable<any> {
        return this.subject.asObservable();
    }
}

过滤器-面板.component.ts

import { Component, OnInit } from '@angular/core';
import { messageService } from '../MesssageService.ts'
@Component({
    ...
})
export class FilterPanelComponent implements OnInit {

public activeFilters: string[];
public text: string="hello world";

constructor(private messageService: MessageService) {
    this.activeFilters = [
        'Apple',
        'Grapes',
        'Bana'
    ];
 }

ngOnInit() {}
     this.messageService.sendMessage('data from filterPanelComponent'); // here you can also pass the object 
}

import { Component, OnInit, ViewChild } from '@angular/core';
import { messageService } from '../MesssageService.ts'

@Component({
    ...
})
export class FilterBarComponent implements OnInit {

    constructor(private messageService: MessageService) {

    }

    ngOnInit() {
     this.messageService.getMessage().subscribe(response => {
     // here we get the data from another component
      console.log(response);
     })
    }
}