将事件从子组件传递到父组件Angular 5 [英] Pass Event from child component to parent component Angular 5
问题描述
我有一个名为program-page
的父组件,它有一个名为program-item
的子组件,现在我在program-item
上有一个按钮,而我希望该按钮要做的是在父组件上调用一个函数.我不知道我会怎么做这样的事情.
program-page.component.html
<app-program-header></app-program-header>
<app-week-display></app-week-display>
<app-program-item [item]="programItem"></app-program-item>
program-page.component.ts
someFunction()
program-item.component.html
<button>click me</button> // button I want to be able to call event on parent component
我知道我可以使用一个事件发射器,但是我以前从未使用过一个事件发射器,并且不确定在这种情况下如何实现它,我还没有看到在子组件上单击按钮调用父组件上的函数的任何示例>
任何帮助将不胜感激!
Angular具有Input和Output,可用于向子组件提供数据并将事件分别发送给父组件.
您可以执行以下操作.
program-page.component.html
<app-program-header></app-program-header>
<app-week-display></app-week-display>
<app-program-item [item]="programItem" (someEvent)="someFunction(data)"></app-program-item>
program-item.component.ts
import { EventEmitter } from '@angular/core';
....
@Output() someEvent = new EventEmitter();
program-item.component.html
<button (click)="someEvent.emit('data')">click me</button>
原始使用输入和输出 Stackblitz示例
I have a parent component called program-page
and it has a child component called program-item
now I have a button on the program-item
and what I want that button to do is to call a function on the parent component.. Im not sure how I would do something like this..
program-page.component.html
<app-program-header></app-program-header>
<app-week-display></app-week-display>
<app-program-item [item]="programItem"></app-program-item>
program-page.component.ts
someFunction()
program-item.component.html
<button>click me</button> // button I want to be able to call event on parent component
Im aware I could use an event emitter but Ive never used one before and not sure how I would implement it in this case, I havent seen any examples where clicking a button on a child component calls a function on the parent
any help would be appreciated!
Angular has Input and Output, which can be used to provide data to a child component and send events to a parent component respectively.
You can do something like this.
program-page.component.html
<app-program-header></app-program-header>
<app-week-display></app-week-display>
<app-program-item [item]="programItem" (someEvent)="someFunction(data)"></app-program-item>
program-item.component.ts
import { EventEmitter } from '@angular/core';
....
@Output() someEvent = new EventEmitter();
program-item.component.html
<button (click)="someEvent.emit('data')">click me</button>
Primitive usage of Input and Output Stackblitz example
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