how should I define an index variable when angular material table is used as ngFor is not used in this table.
I did search for it in the documentation but index is not mentioned any where in it.
<mat-table #table [dataSource]="dataSource">
<!--- Note that these columns can be defined in any order.
The actual rendered columns are set as a property on the row definition" -->
<!-- Position Column -->
<ng-container matColumnDef="position">
<mat-header-cell *matHeaderCellDef> No. </mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.position}} </mat-cell>
</ng-container>
<!-- Name Column -->
<ng-container matColumnDef="name">
<mat-header-cell *matHeaderCellDef> Name </mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.name}} </mat-cell>
</ng-container>
<!-- Weight Column -->
<ng-container matColumnDef="weight">
<mat-header-cell *matHeaderCellDef> Weight </mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.weight}} </mat-cell>
</ng-container>
<!-- Symbol Column -->
<ng-container matColumnDef="symbol">
<mat-header-cell *matHeaderCellDef> Symbol </mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.symbol}} </mat-cell>
</ng-container>
<mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
<mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>
</mat-table>
</div>where and how do i define an index variable for the array that I used in this table, so that I can bind the index value in my table itself.
Can you add index to let element; let i = index;" as you'd do with *ngFor?
<mat-row *matRowDef="let row; columns: displayedColumns; let i = index"></mat-row>
Or like so:
<ng-container matColumnDef="index">
<mat-header-cell *matHeaderCellDef> Index </mat-header-cell>
<mat-cell *matCellDef="let element; let i = index;">{{i}}</mat-cell>
</ng-container>
Working Example: https://stackblitz.com/edit/angular-acdxje?file=app/table-basic-example.html
For those who are facing problem with keeping the right index when using pagination which table has more than 1 page. It can be especially important when you have editable element, thus you're using a routerLink to add/edit/delete selected elements.
<ng-container matColumnDef="title">
<mat-header-cell *matHeaderCellDef mat-sort-header>Title</mat-header-cell>
<mat-cell *matCellDef="let book; let i = index;" fxLayoutAlign.lt-md="center center">
<button mat-button [routerLink]="[i + (paginator.pageIndex * paginator.pageSize)]" routerLinkActive="active"</button>
</mat-cell>
</ng-container>
As well as
<mat-paginator #paginator [pageSize]="5" [pageSizeOptions]="[5, 10, 25, 100]"></mat-paginator>
In essence, i + (paginator.pageIndex * paginator.pageSize) is the solution, but it counts from 0. If you'd like to index from 1, simply make it (i+1) + (paginator.pageIndex * paginator.pageSize). Worth to note is that you really need the #paginator and [pageSize]="VALUE".