【问题标题】:communication between two separate component angular 2两个独立组件之间的通信 angular 2
【发布时间】:2018-02-08 01:42:05
【问题描述】:

在角度 2 中,我想通过服务在两个单独的组件之间进行通信,但它们不是子组件和父组件。 服务组件:

import { Injectable, Inject } from '@angular/core';
import { Subject } from 'rxjs/Subject';
@Injectable()
export class SignUpService {
private openDialog = new Subject<any>();
openDialogObservable$ = this.openDialog.asObservable();
constructor(){}
public open(data: any) {
if (data) {
  this.openDialog.next(data);
  }
 }
}

注册组件:

import { Component, OnInit, Input, ViewChild } from '@angular/core';
import {SignUpService} from "../services/signup-service.service";
import { Subscription } from 'rxjs';
@Component({
selector: 'signup',
templateUrl: './signup.html',
})
export class SignUpComponent implements OnInit {
private SignUpSubscription: Subscription;
display:boolean = false;
constructor(private signUpService: SignUpService) {
}
ngOnInit() {
this.SignUpSubscription = 
this.signUpService.openDialogObservable$.subscribe((res) => {
  if (res == 'show') {
    this.display = true;
  }
});
}
showDialog() {
this.display = true;
}
hideDialog() {
this.display = false;
}
}

注册 Html:

<div style="background-color: #4cae4c; width: 1000px" class="ui-rtl" 
dir="rtl">
<p-dialog [(visible)]="display" width="200px"  modal="true" 
[responsive]="true" tabindex="-1" role="dialog" aria-
labelledby="mySmallModalLabel" aria-hidden="true" >
<p-header class="text-center">
  SignUp
</p-header>
<form (ngSubmit)="onSubmit($event)" #signUpForm="ngForm">

  <div class="group signup form-group" style="width:300px">
    <input #firstName="ngModel" class="form-control" 
  [(ngModel)]="createuser.firstName" name="firstname" type="text" pattern="[\u0600-\u065F\u066A-\u06EF\u06FA-\u06FF][\u0600-\u065F\u066A-\u06EF\u06FA-\u06FF]+" required>
    <span class="highlight"></span>
    <span class="bar"></span>
    <label>Name</label>
    </div>
 </form>
</p-dialog>

关于这个html应该说我用primeng库制作了它,它使用了特殊的标签。 在标题组件中,我有一个按钮(注册),注册组件和模板和服务位于一个单独的文件夹中。我希望当用户单击该按钮时会打开一个模式框。 标头组件:

import {Component, OnInit, EventEmitter, Output, Input, ViewChild} from '@angular/core';
import {SignUpService} from "../services/signup-service.service";
import {Subscription} from 'rxjs';
@Component({
selector: 'header-component',
templateUrl: './header.component.html',
})
export class HeaderComponent {
private subscription: Subscription;
constructor(private signUpService: SignUpService
) {
}
showDialog() {
this.signUpService.open('show');
}

最后这是标题 html:

<a type="button" (click)="showDialog()" >Sign Up</a>

问题:当我单击标题中的注册按钮时,模式框没有打开。 没有错误,但是当我在源中放置断点时,它不会转到 signup.component.ts。问题是什么?我该如何解决? 感谢您以简单的方式提供帮助。 还有这两个链接类似于我的代码。 Parent and children communicate via a serviceExample of Component Communication in Angular 2/4

【问题讨论】:

    标签: angular components directive


    【解决方案1】:

    试试偶数发射器

    首先添加你要传递的数据:

    public pdfdisplayAdded$: EventEmitter<PdfDisplay>;
    
        constructor(private http: Http) {
            this.pdfdisplayAdded$ = new EventEmitter();
        }
    
        setPdfData(retval: any) {
            this.pdfdisplay = retval;
            this.pdfdisplayAdded$.emit(this.pdfdisplay);
            return this.pdfdisplay;
        }
    

    然后订阅您想要获取该数据的事件

     this.pdfDisplayService.pdfdisplayAdded$.subscribe((data: any) => this.setPdfStatus(data));
    

    【讨论】:

      【解决方案2】:

      试试这个:

      openDialog公开:

      export class SignUpService {
        public openDialog = new Subject<any>();
        //...
      }
      

      并订阅openDialog

      export class SignUpComponent implements OnInit {
        //...
        constructor(private signUpService: SignUpService) {
        }
        ngOnInit() {
          this.SignUpSubscription = 
          this.signUpService.openDialog.subscribe((res) => {
            if (res == 'show') {
               this.display = true;
            }
          });
        //...
      

      【讨论】:

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