Question

尝试输入属性绑定时，我将属性设置为undefined。带输入的组件： like.component.ts `

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

@Component({
  selector: 'like',
  templateUrl: './like.component.html',
  styleUrls: ['./like.component.css']
})
export class LikeComponent{
  @Input('is-liked') isLiked: boolean;
  @Input('likes-count') likesCount: number;


  onClick(){
    console.log("clicked");
    console.log(this.likesCount);
    console.log(this.isLiked);
    this.likesCount += (this.isLiked) ? -1 : 1;
    this.isLiked = !this.isLiked;

  }

}

` like.component.html

<p>
  likes work
</p>
<span class="glyphicon glyphicon-heart"
      [class.highlighted]="isLiked"
      (click)=onClick()></span>
<span>{{ likesCount }}</span>

app.component.ts

import { Component } from '@angular/core';
import { LikeComponent } from './like/like.component';
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {

    isSelected = true;
    likesCount = 5;


}

app.component.html

<like 
[likes-count]="likesCount"
[is-liked]="isSelected"
></like>

我在Like组件中声明了输入属性，然后将它们绑定在app组件中 - 但似乎没有传递值： Developer Tools Console

Answer 1

你应该有

<like 
[likescount]="likesCount"
[isliked]="isSelected"
></like>

和

 @Input() isLiked: boolean;
 @Input() likesCount: number;

<强> DEMO STACKBLITZ

Answer 2

在app.module.ts我有

 bootstrap: [AppComponent, LikeComponent]

并将其更改为：

 bootstrap: [AppComponent]

现在属性按预期绑定。

为什么我的输入属性绑定不起作用？ - Angular

2 个答案: