[英]Angular 2 - set attribute of list item according to component variable
I have a list of items and when the page loads I want the first item to look active. 我有一个项目列表,当页面加载时,我希望第一个项目显示为活动状态。
<li *ngFor="let link of links; let i = index;" (click)="setActive(i)" class="{i === activeIndex ? 'active' : ''}">
<a routerLink="{{link.url}}">{{link.text}}</a>
</li>
and the class looks like this 班级看起来像这样
export class NavbarComponent{
private links: Array<Object>;
private activeIndex: number = 0;
constructor(private linksService: LinksService) {
this.links = linksService.getNavLinks();
}
setActive(index: number) {
this.activeIndex = index;
}
}
The list item becomes active correctly on clicking it. 单击列表项后,该列表项将正确激活。 But not when the page loads.
但是在页面加载时不行。 What mistake am I making?
我犯什么错误?
You can use the first
variable provided by ngFor
and use [class.xxx]="..."
binding to set/remove a class: 您可以使用
ngFor
提供的first
变量,并使用[class.xxx]="..."
绑定来设置/删除类:
<li *ngFor="let link of links; let i = index"
[class.active]="activeIndex == i"
(click)="setActive(i)">
<a routerLink="{{link.url}}">{{link.text}}</a>
</li>
See also Implementing ngClassEven ngClassOdd for angular 2 另请参见实现angular 2的ngClassEven ngClassOdd
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