角料表中如何定义折射率

如何定义一个索引变量，当角材料表使用 ngFor 时，在这个表中不使用。

我确实在文档中搜索了它，但是索引在其中的任何地方都没有提到。

  <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>

我在哪里以及如何为我在这个表中使用的数组定义一个索引变量，这样我就可以绑定表本身中的索引值。

108174 次浏览
小开
最佳答案

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

小开

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

小开

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>
小开

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".

小开

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>
小开

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"

小开 

<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.

小开

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;
小开

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>
小开 
<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


提交答案