HTML

ngfor index

<ul>
    <li *ngFor="let item of items; let i = index" [attr.data-index]="i">
        {{item}}
    </li>
</ul>

how to get index for ngfor

*ngFor="let item of items; index as i;" 
// OR
*ngFor="let item of items; let i = index;"
// i will be the index, starting from 0 
// and you can show it in the string interpolation with {{ i }}

ngfor index

<ul>
    <li *ngFor="let item of items; index as i">
        {{item}}
    </li>
</ul>

ngfor index

<ul>
  <li *ngFor="let food of menu; index as i">
      {{ index }},{{ food }}
  </li>
</ul>
<!-- index starts from 0 
This gives an undordered list of food items in a menu, with the first item as 0-->

ngfor index

<ul>
    <li *ngFor="let item of items; let i = index" [attr.data-index]="i">
        {{item}}
        {{i}}
    </li>
</ul>

index in ng for

You have to use let to declare the value rather than #.

<ul>
    <li *ngFor="let item of items; let i = index" [attr.data-index]="i">
        {{item}}
    </li>
</ul>
Angular = 1
<ul>
    <li *ngFor="#item of items; #i = index" [attr.data-index]="i">
        {{item}}
    </li>
</ul>