排序不工作的角度材料設計表

Question

使用 Angular Material Design 表，我只是嘗試對數據表中兩列的標題進行排序。 （它們是下面代碼中的 Employee Name 和 Job Title 列。）兩者都沒有排序。 不知道為什么。 這是我的代碼，謝謝，CM

員工表.component.html

<div>

  <mat-table [dataSource] = "dataSource" matSort>
    <ng-container matColumnDef="photo">
      <mat-header-cell *matHeaderCellDef>Profile</mat-header-cell>
      <mat-cell *matCellDef="let employee"><img width = "100" height = "100" src = "../assets/images/{{employee.username}}.jpg" >
      </mat-cell>
    </ng-container>

    <ng-container matColumnDef="name">
      <mat-header-cell *matHeaderCellDef mat-sort-header>Employee Name</mat-header-cell>
      <mat-cell *matCellDef="let employee">{{employee.name}}</mat-cell>
    </ng-container>


    <ng-container matColumnDef="position">
      <mat-header-cell *matHeaderCellDef mat-sort-header>Job Title</mat-header-cell>
      <mat-cell *matCellDef="let employee">{{employee.position}}</mat-cell>
    </ng-container>

    <mat-header-row *matHeaderRowDef="displayedColumns" color="primary"></mat-header-row>
    <mat-row *matRowDef="let row; columns:displayedColumns"></mat-row>

  </mat-table>
</div>

員工表.component.ts

import { Component, OnInit, ViewChild } from '@angular/core';
import {Observable} from 'rxjs/Observable';
import {MatSort, MatSortable, MatTableDataSource} from '@angular/material';
import {EmployeeService} from '../employee.service';

@Component({
  selector: 'app-employee-table',
  templateUrl: './employee-table.component.html',
  styleUrls: ['./employee-table.component.css']
})
export class EmployeeTableComponent implements OnInit {
  @ViewChild(MatSort) sort: MatSort;
  dataSource;
  displayedColumns = ['photo', 'name', 'position'];

  constructor() { }
  ngOnInit() {   
    this.dataSource =[
            {
              "id": 1,
              "name": "Leanne Grahamz",
              "username": "Bret",
              "position": "Software Developer"
            },
            {
              "id": 2,
              "name": "Ervin Howell",
              "username": "Antonette",
              "position": "Graphic Designer"
            },
            {
              "id": 3,
              "name": "Clementine Bauch",
              "username": "Samantha",
              "position": "Front End Developer"
            },
            {
              "id": 4,
              "name": "Patricia Lebsack",
              "username": "Karianne",
              "position": "Full Stack Developer"
            },
            {
              "id": 5,
              "name": "Chelsey Dietrich",
              "username": "Kamren",
              "position": "Database Administrator" 
            }
    ]; //End data object

    this.dataSource.sort = this.sort;

  }//End ng onInit

}//End class EmployeeTableComponent

Answer 1

您正在設置數據源排序this.dataSource.sort = this.sort; 在生命周期中為時過早。 正如material.angular.io 示例所建議的，您應該在視圖 init 之后設置數據源排序：

復制自material.angular.io 示例：

 /**
   * Set the sort after the view init since this component will
   * be able to query its view for the initialized sort.
   */
  ngAfterViewInit() {
    this.dataSource.sort = this.sort;
  }

您還應該編輯您的數據源初始化：

ngOnInit() {
 this.dataSource = new MatTableDataSource([{
     "id": 1,
     "name": "Leanne Grahamz",
     "username": "Bret",
     "position": "Software Developer"
    }, 
    ...
    {
     "id": 5,
     "name": "Chelsey Dietrich",
     "username": "Kamren",
     "position": "Database Administrator"
    }
   ]);
}

這是對您的代碼的初始示例的編輯。

Answer 2

或者，您也可以使用超時進行排序（如果需要，還可以分頁），例如：

setTimeout(() => {
  this.tableDataSource.sort = this.sort;
  this.tableDataSource.paginator = this.paginator;
}, 0);