垫表内的垫表显示每条记录收件箱 x 的额外行

Question

我在Mat-Table中实现了一个Mat-Table。显示的数据是正确的。但是，对于父行的每一行，它在 Mat-Table 中显示一个额外的空行。由于我无法追踪错误，我在此论坛上寻求帮助。请帮忙。

HTML 代码如下所示。

<div class="mat-elevation-z8">
<table mat-table [dataSource]="listData" class="mat-elevation-z8" matSort multiTemplateDataRows width="100%">
<!--- Note that these columns can be defined in any order.
The actual rendered columns are set as a property on the row definition" -->
<!-- Tax Code Column -->
<ng-container matColumnDef="taxCode">
<th mat-header-cell *matHeaderCellDef mat-sort-header> Tax Code </th>
<td mat-cell *matCellDef="let element" align="left"> {{element.taxCode}} </td>
</ng-container>
<!-- Tax Name Column -->
<ng-container matColumnDef="taxDescription">
<th mat-header-cell *matHeaderCellDef mat-sort-header> Name </th>
<td mat-cell *matCellDef="let element" align="left"> {{element.taxDescription}} </td>
</ng-container>
<!-- Tax Type Code Column -->
<ng-container matColumnDef="taxTypeCode">
<th mat-header-cell *matHeaderCellDef mat-sort-header> Tax Type Code </th>
<td mat-cell *matCellDef="let element" align="left"> {{element.taxTypeCode}} </td>
</ng-container>
<!-- Edit Column -->
<ng-container matColumnDef="edit">
<th mat-header-cell *matHeaderCellDef>
</th>
<td mat-cell *matCellDef="let row">
<a mat-button matTooltip="Edit" [routerLink]="['/tax/edit', row.taxCode]" *ngIf="isUserAuthenticated"><mat-icon>create</mat-icon></a>
</td>
</ng-container>
<!-- Delete Column -->
<ng-container matColumnDef="delete">
<th mat-header-cell *matHeaderCellDef>
</th>
<td mat-cell *matCellDef="let row">
<button mat-button matTooltip="Delete" color="warn" (click)="onDelete(row.taxCode)" *ngIf="isUserAuthenticated"><mat-icon>clear</mat-icon></button>
</td>
</ng-container>
<!-- Expanded Content Column - The detail row is made up of this one column that spans across all columns -->
<ng-container matColumnDef="expandedDetail">
<td mat-cell *matCellDef="let element" [attr.colspan]="displayedColumns.length">
<div class="example-element-detail"
[@detailExpand]="element == expandedElement ? 'expanded' : 'collapsed'" *ngIf="element.taxVersion.length > 0">
<table mat-table [dataSource]="element.taxVersion" class="mat-elevation-z8" width="100%">
<ng-container matColumnDef="taxID">
<th mat-header-cell *matHeaderCellDef> Tax ID </th>
<td mat-cell *matCellDef="let elem"> {{elem.taxID}} </td>
</ng-container>

<ng-container matColumnDef="versionCode">
<th mat-header-cell *matHeaderCellDef> Version Code </th>
<td mat-cell *matCellDef="let elem"> {{elem.versionCode}} </td>
</ng-container>

<ng-container matColumnDef="versionDate">
<th mat-header-cell *matHeaderCellDef> Version Date </th>
<td mat-cell *matCellDef="let elem"> {{elem.versionDate}} </td>
</ng-container>

<ng-container matColumnDef="taxRate">
<th mat-header-cell *matHeaderCellDef> Tax Rate </th>
<td mat-cell *matCellDef="let elem"> {{elem.taxRate}} </td>
</ng-container>

<tr mat-header-row *matHeaderRowDef="displayedColumnsVersion"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumnsVersion;"></tr>
</table>
</div>
</td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumns;"
class="example-element-row"
[class.example-expanded-row]="expandedElement === row"
(click)="expandedElement = row"
>
</tr>
<tr mat-row *matRowDef="let row; columns: ['expandedDetail']" class="example-detail-row"></tr>
</table>
<mat-paginator [pageSizeOptions]="[7, 15, 20]" showFirstLastButtons></mat-paginator>
</div>

在此处输入图像描述

Answer 1

如果没有element.taxVersion，你需要隐藏ng-container，现在看起来你只显示ng-container的内部，如果长度大于0，留下一个空容器。

<ng-container *ngIf="element.taxVersion.length > 0" matColumnDef="expandedDetail">

Answer 2

在另一个垫桌中使用一个垫桌有一个不幸的副作用。Mat-table 将呈现其范围内的所有 mat-row，包括内部表中的 mat-row。您可以为<tr mat-row *matRowDef="let row; columns: displayedColumnsVersion;"></tr>行提供额外的类class='inner-table-row'，并检查额外的行以查看这是否是问题所在。解决此问题的最佳方法是将内部表移动到另一个组件中，并使用选择器将其呈现在外部表中。