父组件向子组件传值 @Input
文件目录
父组件：
father.template.html
<h1> 父组件 </h1>
<cmt-child [data]=’data’></cmt-child>
father.component.ts
import {Component, OnInit} from ‘@angular/core’;
@Component({
selector: ‘cmt-father’,
templateUrl: ‘./father.template.html’
})
export class FatherComponent implements OnInit {
data: any = ‘ 我是传往子组件的值 ’
ngOnInit() {
}
ngOnChanges() {
}
}
子组件：（使用 @Input 修饰器去接收）
childcomponent.ts
import {Component, OnInit, Input} from ‘@angular/core’;
@Component({
selector: ‘cmt-child’,
templateUrl: ‘./child.template.html’
})
export class ChildComponent implements OnInit {
@Input() data: any;// 接收父组件的值
ngOnInit() {
console.log(this.data)
}
ngOnChanges() {
console.log(this.data)
}
}
这样就把值从父组件传到了子组件！
子组件向父组件传值（子组件通过方法借助修饰器 @output 传值给父组件）
子组件
childcomponent.ts
import {Component, OnInit, Input, Output, EventEmitter} from ‘@angular/core’;
@Component({
selector: ‘cmt-child’,
templateUrl: ‘./child.template.html’
})
export class ChildComponent implements OnInit {
@Output(‘checked’) checkedBack = new EventEmitter<any>();
id:any =” 我是传给父组件的值 ”
ngOnInit() {
}
ngOnChanges() {
}
checkedCallback() {
this.checkedBack.emit(this.id);
}
}
child.template.html.html
<h1> 子组件 </h1>
<button (click)=’checkedCallback()’> 点击传值给父组件 </button>
父组件
father.template.html
<h1> 父组件 </h1>
<cmt-child (checked)=”checkedBack($event)”></cmt-child>
father.component.ts
import {Component, OnInit} from ‘@angular/core’;
@Component({
selector: ‘cmt-father’,
templateUrl: ‘./father.template.html’
})
export class FatherComponent implements OnInit {
ngOnInit() {
}
ngOnChanges() {
}
checkedBack(event) {
console.log(event)
}
}
这样子组件通过点击就把值传递给了父组件！