详解Angular父子组件间如何传值？

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Angular中父子组件传值

官方地址：https://angular.cn/guide/component-interaction#component-interaction

1. 父组件给子组件传值

• 说明： 父组件给子组件传值的时候，父组件中在子组件的选择器上绑定数据即可<app-hero-child [transData]='tran_childData'></app-hero-child>
• 子组件接收的时候需要引入input模块import { Component, OnInit, Input} from '@angular/core'
• 子组件还需要使用语法糖的形式接收父组件传递的参数@input() transData

1.1 父组件hero-parent

1、hero-parent.component.html

<p>这是父组件</p>
<app-hero-child [transData]='tran_childData'></app-hero-child>

2、hero-parent.component.ts

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

@Component({
    selector: 'app-hero-parent',
    templateUrl: './app-hero-parent.component.html',
    styleUrls: ['./app-hero-parent.component.scss']
})
export class HeroesComponent implements OnInit {
    tran_childData:string = '这是父组件传递给子组件的数据'
    constructor() {}
    ngOnInit(): void {}
}

1.2 子组件hero-child

1、hero-child.component.html

<p>{{transData}}</p>

2、hero-child.component.ts

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

@Component({
    selector: 'app-hero-child',
    templateUrl: './app-hero-child.component.html',
    styleUrls: ['./app-hero-child.component.scss']
})
export class DetailComponent implements OnInit {
    @Input() transData: string
    constructor() {}
    ngOnInit(): void {
        console.log(this.transData)
    }
}

1.3 效果图

2. 子组件给父组件传递参数

• 说明：子组件给父组件传递参数的时候需要导入Output和EventEmitter，引入模块import { Component, OnInit, Output, EventEmitter} from '@angular/core'
• 使用的时候需要先暴露一个方法@Output() childEvent = new EventEmitter()用来使用emit传递数据
• 具体使用this.childEvent.emit('我是子组件传递的数据')

2.1 子组件hero-child

1. hero-child.component.html

   <button (click)='transData_to_parent()'>我是子组件，给父组件传递参数</button>

2. hero-child.component.ts

   import { Component, OnInit, Output, EventEmitter} from '@angular/core'
   
   @Component({
       selector: 'app-hero-child',
       templateUrl: './app-hero-child.component.html',
       styleUrls: ['./app-hero-child.component.scss']
   })
   export class DetailComponent implements OnInit {
       @Output() childEvent = new EventEmitter()
       constructor() {}
       ngOnInit(): void {},
       // 给父组件传递参数
       transData_to_parent() {
           this.childEvent.emit('我是子组件传递的数据')
       }
   }

2.2 父组件hero-parent

1、hero-parent.component.html

<p>这是父组件</p>
<p>{{receiceData}}</p>
<app-hero-child (childEvent)='receive_child_data($event)'></app-hero-child>

2、hero-parent.component.ts

import { Component, OnInit } from '@angular/core'
	
@Component({
    selector: 'app-hero-parent',
    templateUrl: './app-hero-parent.component.html',
    styleUrls: ['./app-hero-parent.component.scss']
})
export class HeroesComponent implements OnInit {
    constructor() {}
    ngOnInit(): void {}
    receiceData:string
    // 接收子组件传递的数据
    receive_child_data(data) {
        this.receiceData = data
    }
}

2.3 效果图

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