在Angular2中设置ngfor中的属性

Question

试图在一个内部设置所选属性ngFor.下面的代码不起作用,因为浏览器是愚蠢的,checked=false仍然会被视为已检查...

因此,返回的内容必须为true或null.我看到这些人在Angular2中发布了*ngIf的html属性,但我无法使用它,因为我需要将一个值从for循环传递给函数.

我也试过设置[attr.checked]像click事件这样的函数但是也没用.

模板:

<div class="tools">
  <div class="radio-group group-{{section.name}}">
    <label *ngFor="let content of section.content" class="{{content.name}}">
      <input
        type="radio"
        name="{{section.three}}-{{section.name}}"
        value="{{content.id}}"

<!-- This is my problem -->
        [attr.checked]="content.id === section.default"
<!-- You've just pass the problem -->

        (click)="updateModel(section, content)" />
      <div class="radio">
        <span *ngIf="content.thumbnail.charAt(0) == '#'" 
           class="image" [style.background-color]="content.thumbnail">
        </span>
        <span *ngIf="content.thumbnail.length > 0 &&
                     content.thumbnail.charAt(0) != '#'" class="image">
          <img src="/thumbnails/{{section.three}}/{{content.thumbnail}}.jpg" alt="" />
        </span>
        <span *ngIf="content.thumbnail == ''" class="image"></span>
        <span class="label">{{content.displayName}}</span>
      </div>
    </label>
  </div>
</div>

零件:

import { Component, Input } from '@angular/core';
import { AService } from './a.service';

@Component({
    selector: '[radio]',
    templateUrl: 'app/newtabs/ui.radio.component.html'
})
export class UiRadioComponent {
    constructor(private aService: AService) {}

    @Input() section:any;

    updateModel(info: any, content: any ) {
           //does things but not important
        }
    }
}

Answer 1

您应该能够通过简单地比较内联值来设置属性.尝试:

[attr.checked]="section.default == content.id ? 'checked' : null"