标签:pre exp image demo1 ice 创建 输入 报价 中间人
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 corder
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
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
<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
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
<div> 我是父组件 </div> <app-price-quote (priceChange)="priceQutoehandler($event)"></app-price-quote> <div> 这是在报价组件外部,股票代码是{{priceQuote.stockCode}}, 股票价格是{{priceQuote.lastPrice | number:‘2.2-2‘}} </div>
6.效果图
三、中间人模式
当另个组件不是父子组件关系时,需要两个共同的父组件,这个父组件就是中间人模式
中间人模式同时使用了输入属性和输出属性
1. 报价组件定义
import {Component, EventEmitter, OnInit, Output} from ‘@angular/core‘; @Component({ selector: ‘app-price-quote‘, templateUrl: ‘./price-quote.component.html‘, styleUrls: [‘./price-quote.component.css‘] }) export class PriceQuoteComponent implements OnInit { stockCode: string = ‘IBM‘; price: number; //@Output(‘priceChange‘) //lastPrice: EventEmitter<PriceQuote> = new EventEmitter() @Output() buy: EventEmitter<PriceQuote> = new EventEmitter(); constructor() { setInterval(() => { const priceQuote: PriceQuote = new PriceQuote(this.stockCode, 100 * Math.random()); this.price = priceQuote.lastPrice; //this.lastPrice.emit(priceQuote); }, 1000); } buyStock(event) { this.buy.emit(new PriceQuote(this.stockCode, this.price)); } ngOnInit() { } } export class PriceQuote { constructor(public stockCode: string, public lastPrice: number) { } }
2. 报价组件html
<p> 这里是报价组件 </p> <div> 股票代码是{{stockCode}}, 股票价格是{{price | number:‘2.2-2‘}} </div> <div> <input type=‘button‘ value=‘立即购买‘ (click)="buyStock($event)"> </div>
3.订单组件控制器
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
<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
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
<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。
标签:pre exp image demo1 ice 创建 输入 报价 中间人
原文地址:http://www.cnblogs.com/linlf03/p/7257929.html