CODEWITHSUNDEEP
javascriptangulartypescriptangular-material2
pushplata patel
pushplata patel

Reputation: 1075

how to define index in angular material table

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.

Upvotes: 100

Views: 137384

Answers (12)

luis.castano
luis.castano

Reputation: 1

In Angular 14, unique declaration that worked in my case is:

<td mat-cell *matCellDef="let row; let i = dataIndex">

In other parts of my app, index as i also works, but not always. I heard that using let i = index is written in old versions of Angular

Upvotes: 0

ErDeep
ErDeep

Reputation: 169

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>

Also Add index column.

<ng-container matColumnDef="index">
  <mat-header-cell *matHeaderCellDef> Index </mat-header-cell>
  <mat-cell *matCellDef="let element; let i = index;">{{i + 1}}</mat-cell>
</ng-container>

Upvotes: 3

Tortu
Tortu

Reputation: 49

<ng-container matColumnDef="Index">
   <th mat-header-cell *matHeaderCellDef> # </th>
   <td mat-cell *matCellDef="let element; index as i;">
      {{_paginator.pageSize * _paginator.pageIndex + i + 1}}    
   </td>
</ng-container>

Heading

Upvotes: 1

Ankit
Ankit

Reputation: 102

If you are using paginator and you want to place index with every page change then go with this below code; In .HTML file:-

<ng-container matColumnDef="Position">
   <th mat-header-cell *matHeaderCellDef> # </th>
   <td mat-cell *matCellDef="let element; let i= index"> {{i + 1 +
     (thirdPaginator.pageIndex*thirdPaginator.pageSize) }}</td>
</ng-container>

Upvotes: 2

Mohamed Musthaque
Mohamed Musthaque

Reputation: 325

If you are using pagination in your mat-table,

<ng-container matColumnDef="index">
   <mat-header-cell *matHeaderCellDef> Index </mat-header-cell>
   <mat-cell *matCellDef="let element; index as i">
        {{tableOnePaginator.pageSize * tableOnePaginator.pageIndex + i + 1}}</mat-cell>
</ng-container>

In here, this tableOnePaginator is need to define in your ts component before using it. And make sure you have set that to your dataSource as follows.

this.dataSource.paginator = this.tableOnePaginator;

Upvotes: 3

siva gopi
siva gopi

Reputation: 51

<td mat-cell *matCellDef="let row; let indx = dataIndex">

When using the multiTemplateDataRows directive to support multiple rows for each data object, the context of *matRowDef is the same except that the index value is replaced by dataIndex and renderIndex.

Upvotes: 0

Harith Dilshan
Harith Dilshan

Reputation: 1

If you are use paginator try this:

<ng-container matColumnDef="position">
  <th mat-header-cell *matHeaderCellDef> Position </th>
  <td mat-cell *matCellDef="let element; let i = index"> {{(i+1) + (paginator.pageIndex*paginator.pageSize)}} </td>
</ng-container>

this working perfectly for Angular version 8.you must use #paginator and [pageSize]="VALUE"

Upvotes: 0

Roberto Zvjerković
Roberto Zvjerković

Reputation: 10127

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

Upvotes: 193

Ram
Ram

Reputation: 1591

If someone using <mat-paginator ../>, then index can be interpreted as below

<mat-cell *matCellDef="let element; index as i"> {{paginator.pageSize * paginator.pageIndex + i + 1}}</mat-cell>

Upvotes: 8

Daniel Danielecki
Daniel Danielecki

Reputation: 10512

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".

Upvotes: 13

ElasticCode
ElasticCode

Reputation: 7867

From Angular 5 you can alias index to local variable i using index as i

<ng-container matColumnDef="rowIndex">
  <mat-header-cell *matHeaderCellDef> Index </mat-header-cell>
  <mat-cell *matCellDef="let element;index as i;"> {{ i }} </mat-cell>
</ng-container>

Upvotes: 8

adam0101
adam0101

Reputation: 30995

For anyone who has set the multiTemplateDataRows property of mat-table to true, you can't use index. Instead you have use either dataIndex or renderIndex. 

<mat-cell *matCellDef="let row; let i = dataIndex;">{{i}}</mat-cell>

See https://github.com/angular/material2/issues/12793

Upvotes: 138

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