angular ngFor con ejemplo de código de índice

Ejemplo 1: ngfor index

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

Ejemplo 2: ngfor get index

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

Ejemplo 3: ngfor index

/*
ngFor with index in angular is used here for generating 'li' element till the studentDetails array length.
And also make a note if you are using angular 1 then you have to replace 'let' with '#', but its ok if you are using angular 2 or above.
*/

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

/*
I hope it will help you.
Namaste
*/

Ejemplo 4: ngfor index

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

Ejemplo 5: cómo obtener un índice para 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 }}

Ejemplo 6: ngfor index

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

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