在*ngIf语句中如何处理多个案例?我已经习惯了Vue或Angular 1具有if,else if和else的功能,但似乎Angular 4仅具有true(if)和false(else )条件.
How would I have multiple cases in an *ngIf statement? I'm used to Vue or Angular 1 with having an if, else if, and else, but it seems like Angular 4 only has a true (if) and false (else) condition.
根据文档,我只能这样做:
According to the documentation, I can only do:
<ng-container *ngIf="foo === 1; then first else second"></ng-container> <ng-template #first>First</ng-template> <ng-template #second>Second</ng-template> <ng-template #third>Third</ng-template>但是我想有多个条件(类似):
But I want to have multiple conditions (something like):
<ng-container *ngIf="foo === 1; then first; foo === 2; then second else third"></ng-container> <ng-template #first>First</ng-template> <ng-template #second>Second</ng-template> <ng-template #third>Third</ng-template>但是我最终不得不使用ngSwitch,感觉就像是一个黑客:
But I'm ending up having to use ngSwitch, which feels like a hack:
<ng-container [ngSwitch]="true"> <div *ngSwitchCase="foo === 1">First</div> <div *ngSwitchCase="bar === 2">Second</div> <div *ngSwitchDefault>Third</div> </ng-container>或者,似乎我从Angular 1和Vue习以为常的许多语法在Angular 4中均不受支持,那么采用这种条件构造代码的推荐方法是什么?
Alternately, it seems like a lot of the syntaxes I've got used to from Angular 1 and Vue aren't supported in Angular 4, so what would be the recommended way to structure my code with conditions like this?
推荐答案另一种方法是嵌套条件
<ng-container *ngIf="foo === 1;else second"></ng-container> <ng-template #second> <ng-container *ngIf="foo === 2;else third"></ng-container> </ng-template> <ng-template #third></ng-template>更多推荐
* ng如果在模板中,否则
发布评论