通过@angular/cdk-experimental 在 Angular Material 2 表中使用虚拟滚动 [英] Using Virtual Scroll in Angular Material 2 Table with @angular/cdk-experimental

问题描述

我有一个表显示这么多行，我想优化它的性能.我通过使用虚拟滚动技术找到了一个解决方案.下面是一个 Angular Material CDK 虚拟滚动视口组件 用一个简单的 div 我发现:

<div *cdkVirtualFor="let state of statesObservable | async;"class="list-group-item"><div class="state">{{state.name}}</div><div class="capital">{{state.capital}}</div>

</cdk-virtual-scroll-viewport>

但是，我想将它与 Angular Material Table 集成，如下所示

<ng-container *ngFor="let c of shownColumns" [matColumnDef]="c"><th mat-h​​eader-cell *matHeaderCellDef>{{getTitle(c)}}</th><td mat-cell style="white-space: pre-wrap;"*matCellDef="let 元素">{{元素[c]}}</td></ng-容器><tr mat-h​​eader-row *matHeaderRowDef="displayedColumns"></tr><tr mat-row *matRowDef="let row; columns:displayedColumns;"></tr>

我想知道如何将 cdk-virtual-scroll-viewport 包装到 mat-table.我的表格最多显示 1000 行和 20 多列，并且在加载和滚动时性能很慢.

PS:我知道可以通过使用 Paginator 来解决，但我不想那样做.

版本

1. "@angular/material": "^6.2.0"
2. @angular/cdk": "^6.2.0"
3. @angular/cdk-experimental": "^6.2.1"
4. "@angular/core": "6.0.3"
5. "@angular/cli": "6.0.7"

解决方案

尚不支持.但是有些人已经尝试做一些 POC.这是一个 https://github.com/angular/material2/issues/10122#issuecomment-440442656 .

也在这个 issue 中讨论了虚拟滚动以及上述 POC有效.

I have a table displays so many rows, I want to optimize the performance of it. I've found a solution by using Virtual Scroll technique. Here is an example of Angular Material CDK Vritual Scroll Viewport Component with a simple div I've found:

<cdk-virtual-scroll-viewport class="list-container lg" [itemSize]="52.5">
  <div *cdkVirtualFor="let state of statesObservable | async;" class="list-group-item">
     <div class="state">{{state.name}}</div>
     <div class="capital">{{state.capital}}</div>
  </div>
</cdk-virtual-scroll-viewport>

However, I want to integrate it with Angular Material Table like below

<table mat-table [dataSource]="dataSource">
    <ng-container  *ngFor="let c of displayedColumns" [matColumnDef]="c">
      <th mat-header-cell *matHeaderCellDef>{{getTitle(c)}}</th>
      <td mat-cell style="white-space: pre-wrap;" *matCellDef="let element"> {{element[c]}}</td>
    </ng-container>
    <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
    <tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
 </table>

I was wondering how to wrap that cdk-virtual-scroll-viewport to mat-table. My table displays up to 1000 rows and more than 20 columns, and the performance is pretty slow while it's loading and scrolling.

PS: I know that it can be solved by using Paginator, but I don't want to do that.

Versions

1. "@angular/material": "^6.2.0"
2. @angular/cdk": "^6.2.0"
3. @angular/cdk-experimental": "^6.2.1"
4. "@angular/core": "6.0.3"
5. "@angular/cli": "6.0.7"

解决方案

It's not supported yet. But some people have tried to do some POC's. Here is one https://github.com/angular/material2/issues/10122#issuecomment-440442656 .

Also in this issue there is discussion about virtual scrolling and how the above POC works.

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