如何从没有过滤器的角材表中删除特定行？

Question

我的samplepage.component.html

<table mat-table [dataSource]="myDataArray" >
      <!-- <ng-container [matColumnDef]="column" *ngFor="let column of displayedColumns" >
                      <th mat-header-cell *matHeaderCellDef > {{column}} </th>
                      <td mat-cell *matCellDef="let element" > {{element[column]}} </td>
                    </ng-container> -->


      <ng-container matColumnDef="id">
        <th mat-header-cell *matHeaderCellDef> Id. </th>
        <td mat-cell *matCellDef="let element; let i = index;"> {{i+1}} </td>
      </ng-container>


      <ng-container matColumnDef="ticketnumb">
        <th mat-header-cell *matHeaderCellDef> Ticket Number </th>
        <td mat-cell *matCellDef="let element"> {{element.ticketnumb}} </td>
      </ng-container>


      <ng-container matColumnDef="actionsColumn">
          <th mat-header-cell *matHeaderCellDef> Action </th>
          <td mat-cell *matCellDef="let element;  let j = index;"> 
              <button mat-raised-button  color="warn" focusable="false" (click)="deleteTicket(j)">
                  <i class="fa fa-times mat-icon"></i> Remove
                </button>
          </td>
        </ng-container>





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

我的samplepage.component.ts

import { Component, OnInit, ViewChild } from '@angular/core';

@Component({
  selector: 'app-batchticketvalidation',
  templateUrl: './batchticketvalidation.component.html',
  styleUrls: ['./batchticketvalidation.component.css']
})
export class BatchticketvalidationComponent implements OnInit {

  constructor() { }

  ngOnInit() {
  }
  displayedColumns = ['id', 'ticketnumb', 'actionsColumn'];
  dataSource: PeriodicElement[] = ELEMENT_DATA;
  private myDataArray: any;
  private tempTicketCount: number = 0;



  deleteTicket(rowid: number){

   if (rowid > -1) {
    this.myDataArray.splice(rowid, 1);
 }

  }

}


export interface PeriodicElement {
  id: number;
  ticketnumb: string;
  actionsColumn: any;
}


const ELEMENT_DATA: PeriodicElement[] = [
];

我是新手。我需要从表中删除垂直行的帮助，一旦删除了行，表应刷新或显示现有数据。我只有静态行。这只是我想显示给客户端的普通样机html。

每行都有删除按钮，单击删除按钮后，我将调用deleteTicket（rowid）。

触发deleteTicket方法时，不会从Ui中删除该行，但是当我控制台this.myDataArray时，将从对象中删除该数据。

我尝试了所有可能。

Answer 1

在splice()按项目索引之后，您应该更新数据源。

const index = this.dataSource.data.indexOf(item.id);
this.dataSource.data.splice(index, 1);
this.dataSource._updateChangeSubscription(); // <-- Refresh the datasource

Answer 2

问题在于游戏中的不变性：初始化后的 mat-table 只监听数据源引用

<table mat-table [dataSource]="myDataArray">

因此，数据源引用在更改其内容后应该以某种方式更新，例如

  deleteTicket(rowid: number) {
    if (rowid > -1) {
      this.myDataArray.splice(rowid, 1);
      this.myDataArray = [...this.myDataArray]; // new ref!
    }
  }

或者更简单

  deleteTicket(rowid: number) {
    this.myDataArray = this.myDataArray.filter((item, index) => index !== rowid);
  }

Answer 3

我建议使用MatTableDataSource.

dataSource: MatTableDataSource = new MatTableDataSource<T>(ELEMENT_DATA);

deleteFunction(item){
    // find item and remove ist
    dataSource.data.splice(this.dataSource.data.indexOf(item.id), 1);
}