角度:将参数传递给另一个组件 [英] Angular: pass parameter to another component
问题描述
我坚持使用Angular2,我想将参数从产品页面(例如:产品ID)传递到付款页面,这是我尝试的到目前为止:
I'm stuck with Angular2, I would like to pass parameters from a Products page (eg: product ids) to a Payment page, here is what I tried so far:
payment.html:
payment.html :
Message: {{message}}
<page-products></page-products>
payment.ts:
payment.ts :
import { Component, ViewChild, AfterViewInit} from '@angular/core';
import { ProductsPage } from "../../products/products";
@IonicPage()
@Component({
selector: 'page-payment',
templateUrl: 'payment.html'
})
export class PaymentPage implements AfterViewInit {
@ViewChild(ProductsPage) child;
constructor(public navCtrl: NavController) {}
message:string;
ngAfterViewInit() {
this.message = this.child.message
}
}
products.ts:
products.ts :
import { Component} from '@angular/core';
import { IonicPage, NavController } from 'ionic-angular';
@IonicPage()
@Component({
selector: 'page-products',
templateUrl: 'products.html',
})
export class ProductsPage {
message: string = "Hola Mundo!"
constructor(public navCtrl: NavController) {}
goToPayment() {
this.navCtrl.setRoot('PaymentPage');
}
}
product.html:
product.html :
<button ion-button (click)="goToPayment()">pay</button>
但我总是收到此错误消息:
but I always get this error message:
有什么想法我做错了吗?
Any idea of what I'm doing wrong?
这是我的payment.module.ts:
here is my payment.module.ts:
import { NgModule } from '@angular/core';
import { IonicPageModule } from 'ionic-angular';
import { ComponentsModule } from '../../../components/components.module';
import { PaymentPage } from './payment';
import { ProductsPage } from '../../products/products';
@NgModule({
declarations: [
PaymentPage, ProductsPage <-- if I add here ProductsPage, then new error (see under)
],
imports: [
IonicPageModule.forChild(PaymentPage),
ComponentsModule
]
})
export class PaymentPageModule {}
和products.module.ts:
and products.module.ts :
import { NgModule } from '@angular/core';
import { IonicPageModule } from 'ionic-angular';
import { ProductsPage } from './products';
import { ComponentsModule } from '../../components/components.module';
@NgModule({
declarations: [
ProductsPage
],
imports: [
IonicPageModule.forChild(ProductsPage),
ComponentsModule
]
})
export class ProductsPageModule {}
如果我像上面那样声明ProductsPage,则会收到此错误消息:
and if I declare ProductsPage like above then I get this error message:
推荐答案
要在没有层次关系的组件之间传递参数,您应该使用服务.为此,请首先创建服务:
To pass parameters between components that dont have a hierarchical relationship you should use a service. To achieve this, first create the service:
import { Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
@Injectable()
export class MyService {
private messageSource = new BehaviorSubject<type_of_the_message>(message);
currentMessage = this.messageSource.asObservable();
constructor() { }
sendMessage(message: type_of_the_message) {
this.messageSource.next(message);
}
}
然后在发件人组件中:
import { Component, OnInit } from '@angular/core';
import { MyService } from 'pathToService/MyService.service';
@Component({
selector: 'sender',
templateUrl: 'senderTemplate',
styleUrls: ['senderStyles']
})
export class SenderComponent implements OnInit {
private message: type_of_the_message;
constructor(private myService: MyService) {}
ngOnInit() {
this.myService.currentMessage.subscribe(message => this.message = message);
}
sendMessage() {
this.myService.sendMessage(!this.message);
}
}
最后在接收器组件中:
import { Component, OnInit } from '@angular/core';
import { MyService } from 'pathToService/MyService.service';
@Component({
selector: 'receiver',
templateUrl: 'receiverTemplate',
styleUrls: ['receiverStyles']
})
export class ReceiverComponent implements OnInit {
private message: boolean;
constructor(private myService: MyService) {}
ngOnInit() {
this.myService.currentMessage.subscribe(message => this.message = message);
}
}
这篇关于角度:将参数传递给另一个组件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!