角材料表多个粘性行答案

【问题标题】：Angular Material Table multiple sticky rows角材料表多个粘性行
【发布时间】：2020-04-21 16:01:48
【问题描述】：

根据官方文档，我们可以在mat-table 中使用sticky 输入sticky header 行。但我需要使前 3 行的垫子表变得粘稠。有什么办法吗？

<div class="example-container mat-elevation-z8">
  <table mat-table [dataSource]="dataSource">

    <!-- Position Column -->
    <ng-container matColumnDef="position">
      <th mat-header-cell *matHeaderCellDef> No. </th>
      <td mat-cell *matCellDef="let element"> {{element.position}} </td>
    </ng-container>

    <!-- Name Column -->
    <ng-container matColumnDef="name">
      <th mat-header-cell *matHeaderCellDef> Name </th>
      <td mat-cell *matCellDef="let element"> {{element.name}} </td>
    </ng-container>

    <!-- Weight Column -->
    <ng-container matColumnDef="weight">
      <th mat-header-cell *matHeaderCellDef> Weight </th>
      <td mat-cell *matCellDef="let element"> {{element.weight}} </td>
    </ng-container>

    <!-- Symbol Column -->
    <ng-container matColumnDef="symbol">
      <th mat-header-cell *matHeaderCellDef> Symbol </th>
      <td mat-cell *matCellDef="let element"> {{element.symbol}} </td>
    </ng-container>

    <tr mat-header-row *matHeaderRowDef="displayedColumns; sticky: true"></tr>
    <tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
  </table>
</div>

【问题讨论】：

前 3 行，您需要将其设为粘性...这些行来自哪里？ TS 文件或静态内容，我们可以将其作为 HTML 的一部分？
我正在从服务中获取所有数据。所以这些行是动态的。但是，如果需要，我可以编写一些代码来将前 3 行与响应分开。

标签： css angular typescript angular-material

【解决方案1】：

如何为前 2 行创建一个数组（您需要在粘性标题中），之后您可以从实际数据集中删除这 2 行（使用shift()）...

相关HTML：

<div class="example-container mat-elevation-z8">
  <table mat-table [dataSource]="dataSource">

    <!-- Position Column -->
    <ng-container matColumnDef="position">
      <th mat-header-cell *matHeaderCellDef> No. 
        <div *ngFor="let data of firstTwoRows; let i = index">
          <p *ngIf="i<2">{{data.position}} </p>
      </div>
     </th>
      <td mat-cell *matCellDef="let element"> {{element.position}} </td>
    </ng-container>

    <!-- Name Column -->
    <ng-container matColumnDef="name">
      <th mat-header-cell *matHeaderCellDef> Name  
        <div *ngFor="let data of firstTwoRows; let i = index">
          <p *ngIf="i<2">{{data.name}} </p>
      </div>
</th>
      <td mat-cell *matCellDef="let element"> {{element.name}} </td>
    </ng-container>

    <!-- Weight Column -->
    <ng-container matColumnDef="weight">
      <th mat-header-cell *matHeaderCellDef> Weight  
        <div *ngFor="let data of firstTwoRows; let i = index">
          <p *ngIf="i<2">{{data.weight}} </p>
      </div>
</th>
      <td mat-cell *matCellDef="let element"> {{element.weight}} </td>
    </ng-container>

    <!-- Symbol Column -->
    <ng-container matColumnDef="symbol">
      <th mat-header-cell *matHeaderCellDef> Symbol  
        <div *ngFor="let data of firstTwoRows; let i = index">
          <p *ngIf="i<2">{{data.symbol}} </p>
      </div>
</th>
      <td mat-cell *matCellDef="let element"> {{element.symbol}} </td>
    </ng-container>

    <tr mat-header-row *matHeaderRowDef="displayedColumns; sticky: true"></tr>
    <tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
  </table>
</div>

相关TS：

import { Component } from "@angular/core";

/**
 * @title Table with sticky header
 */
@Component({
  selector: "table-sticky-header-example",
  styleUrls: ["table-sticky-header-example.css"],
  templateUrl: "table-sticky-header-example.html"
})
export class TableStickyHeaderExample {
  displayedColumns = ["position", "name", "weight", "symbol"];
  dataSource = ELEMENT_DATA;
  firstTwoRows: PeriodicElement[] = [];
  constructor() {
    this.firstTwoRows = [
      { position: 1, name: "Hydrogen", weight: 1.0079, symbol: "H" },
      { position: 2, name: "Helium", weight: 4.0026, symbol: "He" }
    ];
        this.dataSource.shift();
        this.dataSource.shift();
  }
}

export interface PeriodicElement {
  name: string;
  position: number;
  weight: number;
  symbol: string;
}

const ELEMENT_DATA: PeriodicElement[] = [
  { position: 1, name: "Hydrogen", weight: 1.0079, symbol: "H" },
  { position: 2, name: "Helium", weight: 4.0026, symbol: "He" },
  { position: 3, name: "Lithium", weight: 6.941, symbol: "Li" },
  { position: 4, name: "Beryllium", weight: 9.0122, symbol: "Be" },
  { position: 5, name: "Boron", weight: 10.811, symbol: "B" },
  { position: 6, name: "Carbon", weight: 12.0107, symbol: "C" },
  { position: 7, name: "Nitrogen", weight: 14.0067, symbol: "N" },
  { position: 8, name: "Oxygen", weight: 15.9994, symbol: "O" },
  { position: 9, name: "Fluorine", weight: 18.9984, symbol: "F" },
  { position: 10, name: "Neon", weight: 20.1797, symbol: "Ne" }
];

完成working stackblitz here

【讨论】：