沒有辦法直接顯示的* ngFor之外的一個項目,除非你設置的項目到變量之一。通常這將基於某些事件(例如點擊(),鼠標懸停()等)。
下面是一個示例,顯示了用戶單擊圖像時的常見模式,這設置了另一個變量,然後顯示在任何地方根據需要在組件上進行其他操作
這裏是一個工作plunker: https://plnkr.co/edit/TzBjhisaPCD2pznb10B0?p=preview
import {Component, NgModule, VERSION, OnInit, Input} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
interface Item {
id: number;
name: string;
covor: string
}
@Component({
selector: 'my-app',
template: `
<div>
<h2>Hello {{name}}</h2>
</div>
<div>
<div>
{{selectedItem | json}}
</div>
<div *ngFor="let item of items">
<img [src]="item.cover" alt="item.name" (click)="selectItem(item)">
</div>
</div>
`,
})
export class App implements OnInit {
name:string;
// This is an input just to show that this might be where the data comes from
// otherwise call a service to set the data initially
@Input() items: Item[] = [
{id: 1, name: 'test', cover: 'https://i.vimeocdn.com/portrait/58832_300x300'},
{id: 2, name: 'test2', cover: 'https://lh4.ggpht.com/wKrDLLmmxjfRG2-E-k5L5BUuHWpCOe4lWRF7oVs1Gzdn5e5yvr8fj-ORTlBF43U47yI=w300'},
];
selectedItem: Item;
constructor() {
this.name = `Angular! v${VERSION.full}`
}
ngOnInit() {
// you can init your item here
if(this.items.length > 0) {
this.selectedItem = this.items[0];
}
}
selectItem(item: Item) {
this.selectedItem = item;
}
}
@NgModule({
imports: [ BrowserModule ],
declarations: [ App ],
bootstrap: [ App ]
})
export class AppModule {}
你想每個項目或特定項目的預覽? – cgTag
@ThinkingMedia我想要預覽* ngFor範圍外的特定項目。我實際上使用旋轉木馬。 –