ngfor 在元素点击事件中使用索引

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问题描述

我想在我的筹码上制作一个删除按钮，所以我尝试了:

I am trying to make a remove button on my chips so I tried:

<mat-chip-list>
  <mat-chip *ngFor="let condition of conditions; let i = index">
    {{condition.column.friendlyName}} {{condition.operator.symbol}} {{condition.value}} 
    <mat-icon class="close-icon" (click)="removeChip(i)">highlight_off</mat-icon>
  </mat-chip>
</mat-chip-list>

但它说 i 未定义.点击时获取筹码索引的正确方法是什么?

but it says i is not defined. What is correct way to get the chips index when it is clicked?

推荐答案

this is updated in angular 5+ to index as i:

<mat-chip *ngFor="let condition of conditions; index as i"> 
  {{condition.column.friendlyName}} {{condition.operator.symbol}} {{condition.value}} 
  <mat-icon class="close-icon" (click)="removeChip(i)">highlight_off</mat-icon>
</mat-chip>

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