一、输入属性(父组件与子组件通信)
1. 创建工程
ng new demo1
2.创建order组件
ng g component order
3. 在order组件里定义输入属性
order组件的html
4. 父组件
app.component.ts中定义stock
app.component.html, 采用双向绑定
效果图
最终父组件IBM的值,通过输入属性,把值传递给了子组件
二、输出属性(子组件与父组件通信)
1. ng g component priceQutoe 创建报价组件
2. 定义报价组件控制器
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import {Component, EventEmitter, OnInit, Output} from '@angular/core' ;
@Component({ selector: 'app-price-quote' ,
templateUrl: './price-quote.component.html' ,
styleUrls: [ './price-quote.component.css' ]
}) export class PriceQuoteComponent implements OnInit {
stockCode: string = 'IBM' ;
price: number;
@Output( 'priceChange' )
lastPrice: EventEmitter<PriceQuote> = new EventEmitter();
constructor() {
setInterval(() => {
let priceQuote: PriceQuote = new PriceQuote( this .stockCode, 100 * Math.random());
this .price = priceQuote.lastPrice;
this .lastPrice.emit(priceQuote);
}, 1000);
}
ngOnInit() {
}
} export class PriceQuote {
constructor(public stockCode: string,
public lastPrice: number) {
}
} |
3. 定义报价组件html
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<p> 这里是报价组件
</p> <div> 股票代码是{{stockCode}}, 股票价格是{{price | number: '2.2-2' }}
</div> |
4. 父组件控制器
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import { Component } from '@angular/core' ;
import {PriceQuote} from './price-quote/price-quote.component' ;
@Component({ selector: 'app-root' ,
templateUrl: './app.component.html' ,
styleUrls: [ './app.component.css' ]
}) export class AppComponent {
stock = '' ;
title = 'app' ;
priceQuote: PriceQuote = new PriceQuote( '' , 0);
priceQutoehandler(event: PriceQuote){
this .priceQuote = event;
}
} |
5. 父组件html
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<div> 我是父组件
</div> <app-price-quote (priceChange)= "priceQutoehandler($event)" ></app-price-quote>
<div> 这是在报价组件外部,股票代码是{{priceQuote.stockCode}},
股票价格是{{priceQuote.lastPrice | number: '2.2-2' }}
</div> |
6.效果图
三、中间人模式
当另个组件不是父子组件关系时,需要两个共同的父组件,这个父组件就是中间人模式
中间人模式同时使用了输入属性和输出属性
1. 报价组件定义
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import {Component, EventEmitter, OnInit, Output} from '@angular/core' ;
@Component({ selector: 'app-price-quote' ,
templateUrl: './price-quote.component.html' ,
styleUrls: [ './price-quote.component.css' ]
}) export class PriceQuoteComponent implements OnInit {
stockCode: string = 'IBM' ;
price: number;
//@Output('priceChange')
//lastPrice: EventEmitter<PriceQuote> = new EventEmitter()
@Output()
buy: EventEmitter<PriceQuote> = new EventEmitter();
constructor() {
setInterval(() => {
const priceQuote: PriceQuote = new PriceQuote( this .stockCode, 100 * Math.random());
this .price = priceQuote.lastPrice;
//this.lastPrice.emit(priceQuote);
}, 1000);
}
buyStock(event) {
this .buy.emit( new PriceQuote( this .stockCode, this .price));
}
ngOnInit() {
}
} export class PriceQuote {
constructor(public stockCode: string,
public lastPrice: number) {
}
} |
2. 报价组件html
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<p> 这里是报价组件
</p> <div> 股票代码是{{stockCode}}, 股票价格是{{price | number: '2.2-2' }}
</div> <div> <input type= 'button' value= '立即购买' (click)= "buyStock($event)" >
</div> |
3.订单组件控制器
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import {Component, Input, OnInit} from '@angular/core' ;
import {PriceQuote} from "../price-quote/price-quote.component" ;
@Component({ selector: 'app-order' ,
templateUrl: './order.component.html' ,
styleUrls: [ './order.component.css' ]
}) export class OrderComponent implements OnInit {
@Input()
priceQutoe: PriceQuote;
constructor() { }
ngOnInit() {
}
} |
4. 订单组件html
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<div> 我下单组件
</div> <div> 买100手{{priceQutoe.stockCode}}股票,买入价为{{priceQutoe.lastPrice | number: '2.2-2' }}
</div> |
5. 父组件的控制器
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import { Component } from '@angular/core' ;
import {PriceQuote} from './price-quote/price-quote.component' ;
@Component({ selector: 'app-root' ,
templateUrl: './app.component.html' ,
styleUrls: [ './app.component.css' ]
}) export class AppComponent {
stock = '' ;
priceQuote: PriceQuote = new PriceQuote( '' , 0);
priceQutoehandler(event: PriceQuote){
this .priceQuote = event;
}
buyHandler(event: PriceQuote) {
this .priceQuote = event;
}
} |
6.父组件的html
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<div> 我是父组件
</div> <app-price-quote (buy)= "buyHandler($event)" ></app-price-quote>
<app-order [priceQutoe]= "priceQuote" ></app-order>
|
7.效果图
当点击“立即购买”时,显示当时的显示价格。
本文转自Work Hard Work Smart博客园博客,原文链接:http://www.cnblogs.com/linlf03/p/7257929.html,如需转载请自行联系原作者