ngFor with index as value in attribute

In Angular 5/6/7/8:

<ul>
  <li *ngFor="let item of items; index as i">
    {{i+1}} {{item}}
  </li>
</ul>

In older versions

<ul *ngFor="let item of items; index as i">
  <li>{{i+1}} {{item}}</li>
</ul>

Angular.io ▸ API ▸ NgForOf

Description

Local variables

Unit test examples

ng_for_spec.ts

Another interesting example

Grouping

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Just an update to this, Thierry's answer is still correct, but there has been an update to Angular2 with regards to:

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

The #i = index should now be let i = index

EDIT/UPDATE:

The *ngFor should be on the element you're wanting to foreach, so for this example it should be:

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

EDIT/UPDATE

Angular 5

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

EDIIT/UPDATE

Angular 7/8

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

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I think its already been answered before, but just a correction if you are populating an unordered list, the *ngFor will come in the element which you want to repeat. So it should be insdide <li>. Also, Angular2 now uses let to declare a variable.

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

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The other answers are correct but you can omit the [attr.data-index] altogether and just use

<ul>
    <li *ngFor="let item of items; let i = index">{{i + 1}}</li>
</ul

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Adding this late answer to show a case most people will come across. If you only need to see what is the last item in the list, use the last key word:

<div *ngFor="let item of devcaseFeedback.reviewItems; let last = last">
  <divider *ngIf="!last"></divider>
</div>

This will add the divider component to every item except the last.

Because of the comment below, I will add the rest of the ngFor exported values that can be aliased to local variables (As are shown in the docs):

$implicit: T: The value of the individual items in the iterable (ngForOf).

ngForOf: NgIterable: The value of the iterable expression. Useful when the expression is more complex then a property access, for example when using the async pipe (userStreams | async).

index: number: The index of the current item in the iterable.

count: number: The length of the iterable.

first: boolean: True when the item is the first item in the iterable.

last: boolean: True when the item is the last item in the iterable.

even: boolean: True when the item has an even index in the iterable.

odd: boolean: True when the item has an odd index in the iterable.

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You can use [attr.data-index] directly to save the index to data-index attribute which is available in Angular versions 2 and above.

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

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with laravel pagination

file.component.ts file

    datasource: any = {
        data: []
    }

    loadData() {
        this.service.find(this.params).subscribe((res: any) => {
            this.datasource = res;
        });
    }

html file

   <tr *ngFor="let item of datasource.data; let i = index">
       <th>{{ datasource.from + i }}</th>
   </tr>

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Try this

<div *ngFor="let piece of allPieces; let i=index">
{{i}} // this will give index
</div>

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