Creating a reusable button component in Angular

问题

I am trying to create a component in Angular 5 that will house a reusable template for a button. In different parts of my app buttons will call different functions, so I would like to be able to tell the given instance of the button what function to call. I know I could create an HTML tag for a button wherever I need it, but I was hoping I could create a reusable component so I can ensure formatting is consistent throughout the app.

Error

 Got interpolation ({{}}) where expression was expected at column 0 in 
        [{{functioncall}}]

Component

<div id = "button">
  <button type="button" class= "btn" (click) ="{{functioncall}}" >{{label}}</button>
</div>

And HTML

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

    @Component({
      selector: 'app-button',
      templateUrl: './button.component.html',
      styleUrls: ['./button.component.css']
    })
    export class ButtonComponent implements OnInit {
      @Input() label:string;
      @Input() functionCall:string;

      constructor() { }

      ngOnInit() {
      }
    }

回答1:

you have to use the @Output decorator to emit some event (from child to parent)

button.component.ts:

@Input() label: string;
@Output() onClick = new EventEmitter<any>();

onClickButton(event) {
    this.onClick.emit(event);
  }

button.component.html:

<div id = "button">
  <button type="button" class= "btn" (click)="onClickbutton($event)" >{{label}}</button>
</div>

parent.component.ts

label = "button label"

  functioncall(event) {
    console.log('functioncall', event);
  }

parent.component.html

<app-button (onClick)="functioncall($event)" [label]="label"></app-button>

See example: https://stackblitz.com/edit/angular-gghsax

回答2:

In addition to @miladfm answer, I'd recommend using the <ng-content></ng-content> directive here to pass content through instead of pulling in {{label}}, assigning the @Output decorator to click instead of onClick, and using the MouseEvent type instead of any. Using these changes will allow the button component to behave syntactically more like a native button when it's consumed:

button.component.ts

...
@Output() click = new EventEmitter<MouseEvent>();

onClickButton(event) {
  this.onClick.emit(event);
}
...

button.component.html

<div id = "button">
  <button type="button" class="btn" (click)="onClickbutton($event)">
    <ng-content></ng-content>
  </button>
</div>

parent.component.ts

...
functioncall(e: MouseEvent) {
 // do stuff
}
...

parent.component.html

<app-button  (click)="functioncall($event)">Your Label Here</app-button>

回答3:

Reusable Component - it's work for me

I have created button as reusable component

button.component.html

< button type="button" class= "btn" >{{label}} < / button >

button.component.ts

export class ButtonComponent {

      @Input() label: string;

      @Output() onClick = new EventEmitter<any>();

      constructor() {}

      onClickButton(event) {

          this.onClick.emit(event);

      }
 }

user.component.html

< app-button (click)="functioncall($event)" [label]="label"> < /app-button >
user.component.ts

label = 'Hello World';

来源：https://stackoverflow.com/questions/49826096/creating-a-reusable-button-component-in-angular

标签

angular

button