[英]Using *ngIf with a dynamic variable in Angular 2
我正在關注這個例子: Angular2.io Example 。
當selectedHero
為null
,不應顯示div
元素,這可以正常工作,但是當我使用 click 事件選擇一個英雄並且selectedHero
不為null
, div
元素仍未顯示。
我也嘗試過使用boolean
變量,但在更改單擊事件后,變量已更新,但div
元素仍未顯示。
<ul>
<li *ngFor='let hero of myHeroes' (click)="onSel(hero)">
<div><label>id: </label>{{hero.id}}</div>
<div><label>Name: </label>{{hero.name}}</div>
</li>
</ul>
</div>
<div *ngIf="selectedHero">
<h2>{{selectedHero.name}} details!</h2>
<div><label>id: </label>{{selectedHero.id}}</div>
<div>
<label>name: </label>
<input [(ngModel)]="selectedHero.name" placeholder="name" />
</div>
這是組件代碼:
export class AppComponent {
title = 'Tour of heroes!';
selectedHero: Hero;
HeroesList: Hero[] = [//can also be used to display
{ id: 11, name: 'Mr. Nice' },
{ id: 12, name: 'Narco' },
{ id: 13, name: 'Bombasto' },
{ id: 14, name: 'Celeritas' },
{ id: 15, name: 'Magneta' },
{ id: 16, name: 'RubberMan' },
{ id: 17, name: 'Dynama' },
{ id: 18, name: 'Dr IQ' },
{ id: 19, name: 'Magma' },
{ id: 20, name: 'Tornado' }
];
onSel(shero: Hero): void {
this.selectedHero = shero;
// alert(this.selectedHero.name);
}
}
export class Hero {
id: number;
name: string;
}
問題出在模板中,ul 元素要在 div 內,否則代碼不起作用,請告訴我原因,謝謝。
<div>
<ul>
<li *ngFor='let hero of myHeroes' (click)="onSel(hero)">
<div><label>id: </label>{{hero.id}}</div>
<div><label>Name: </label>{{hero.name}}</div>
</li>
</ul>
</div>
<div *ngIf="selectedHero">
<h2>{{selectedHero.name}} details!</h2>
<div><label>id: </label>{{selectedHero.id}}</div>
<div>
<label>name: </label>
<input [(ngModel)]="selectedHero.name" placeholder="name" />
</div>
</div>
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