Mat数据表分页和排序不起作用

Question

我有这样的HTML代码：

<div class="mat-elevation-z8" *ngIf="Model">
  <br>
  <mat-form-field class="col-md-3 col-lg-3">
    <input matInput (keyup)="applyFilter($event.target.value)" placeholder="Filter">
  </mat-form-field>


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

    <ng-container matColumnDef="StartTime">
      <th mat-header-cell *matHeaderCellDef mat-sort-header> StartTime </th>
      <td mat-cell *matCellDef="let row" style="width: 15%"> {{row.call_start_time | date:'dd-MM-yyyy HH:mm:ss'}} </td>
    </ng-container>

    <ng-container matColumnDef="Duration">
      <th mat-header-cell *matHeaderCellDef mat-sort-header> Duration </th>
      <td mat-cell *matCellDef="let row"> {{row.call_total_duration}} </td>
    </ng-container>


    <ng-container matColumnDef="CallType">
      <th mat-header-cell *matHeaderCellDef mat-sort-header> CallType </th>
      <td mat-cell *matCellDef="let row" style="width: 5%"> {{row.call_type}} </td>
    </ng-container>

    <ng-container matColumnDef="CLI">
      <th mat-header-cell *matHeaderCellDef mat-sort-header> CLI </th>
      <td mat-cell *matCellDef="let row" style="width: 15%"> {{row.call_cli}} </td>
    </ng-container>

    <ng-container matColumnDef="Campaign">
      <th mat-header-cell *matHeaderCellDef mat-sort-header> Campaign </th>
      <td mat-cell *matCellDef="let row" style="width: 20%"> {{row.call_service_name}} </td>
    </ng-container>
    &nbsp;&nbsp;

    <ng-container matColumnDef="Agent">
      <th mat-header-cell *matHeaderCellDef mat-sort-header> Agent </th>
      <td mat-cell *matCellDef="let row"> {{row.call_agent_id}} </td>
    </ng-container>

    <ng-container matColumnDef="Disposition">
      <th mat-header-cell *matHeaderCellDef mat-sort-header> Disposition </th>
      <td mat-cell *matCellDef="let row" style="width: 20%"> {{row.call_end_type_name}} </td>
    </ng-container>

    <ng-container matColumnDef="Remarks">
      <th mat-header-cell *matHeaderCellDef mat-sort-header> Remarks </th>
      <td mat-cell *matCellDef="let row" style="width: 20%"> {{row.call_remark}} </td>
    </ng-container>

    <ng-container matColumnDef="TransfferedTo">
      <th mat-header-cell *matHeaderCellDef mat-sort-header style="width: 5%"> TransfferedTo </th>
      <td mat-cell *matCellDef="let row" style="width: 5%"> {{row.call_child_callnumber}} </td>
    </ng-container>

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

  <mat-paginator [pageSizeOptions]="[5,10, 25]"></mat-paginator>
</div>

我提到的问题：mat-sort not working on mat-table

我已经提到了一些问题，但是所有问题都在ngOnInit（）上调用服务，但是我需要在.ts文件中的ngSubmit（）方法上调用服务。

分页和排序不起作用。我认为我的类型脚本文件有问题，它看起来像这样：

import { Component, OnInit, ViewChild } from '@angular/core';
import { FormControl } from '@angular/forms';
import { Observable } from 'rxjs';
import { startWith, map } from 'rxjs/operators';
import { CampaignService } from 'services/campaign.service';
import { MatPaginator, MatSort, MatTableDataSource } from '@angular/material';



export interface State {
  Name: string;
  Id: number;
}
@Component({
  selector: 'app-logs',
  templateUrl: './logs.component.html',
  styleUrls: ['./logs.component.css']
})
export class LogsComponent implements OnInit {
  dataSource: MatTableDataSource<any>;
  displayedColumns: string[] = ['StartTime', 'Duration', 'CallType', 'CLI', 'Campaign' , 'Agent' , 'Disposition' , 'Remarks' , 'TransfferedTo'];

  @ViewChild(MatPaginator) paginator: MatPaginator;
  @ViewChild(MatSort) sort: MatSort;

  constructor(private webService: CampaignService) {
  
  }


  FromDate: any;
  ToDate: any;
  Campaign: any;
  Agent: any;
  MobileNumber: any;
  stateCtrl = new FormControl();
  filteredStates: Observable<State[]>;
  Model: any;
  Data: any;
  Result: any;

  private _filterStates(value: string): State[] {
    const filterValue = value.toLowerCase();

    return this.Data.filter(state => state.Name.toLowerCase().indexOf(filterValue) === 0);
  }

  ngOnInit() {

    //this.dataSource = new MatTableDataSource(this.Result);
    this.dataSource.paginator = this.paginator;
    this.dataSource.sort = this.sort;
  }



  applyFilter(filterValue: string) {
    this.dataSource.filter = filterValue.trim().toLowerCase();

    if (this.dataSource.paginator) {
      this.dataSource.paginator.firstPage();
    }
  }

  onSubmit(data) {

    const deatails = JSON.stringify({
      FromDate: FromDate,
      ToDate: ToDate,
      Campaign: this.Campaign,
      Agent: data.Agent,
      MobileNumber: data.MobileNumber
    });


    this.webService.CallDetails(deatails)
      .subscribe(
        response => {
          this.Model = response;
          this.Result = this.Model.log
          this.dataSource = new MatTableDataSource( this.Result);
    
        },
        (error) => console.error(error)
      );
   
  }


}

有人能指出我哪里出问题了吗？提前非常感谢。

Answer 1

不幸的是，这是一个Angular事物，其中ViewChild不能在ngAfterViewInit中使用* ngIf捕获元素。

https://github.com/angular/components/issues/8705#issuecomment-377266657

Answer 2

确保添加了

import { MatPaginatorModule, MatSortModule } from '@angular/material';

和

@NgModule({ exports: [ MatPaginatorModule, MatSortModule] })

在您相应的模块中

Answer 3

在ngOnInit方法中，似乎您正在使用尚未初始化的dataSource成员。

您可以摆脱方法ngOnInit并将其内容向下移动到处理Web服务结果的位置。

this.webService.CallDetails(deatails)
  .subscribe(
     response => {
        this.Model = response;
        this.Result = this.Model.log
        this.dataSource = new MatTableDataSource( this.Result);
        this.dataSource.paginator = this.paginator;
        this.dataSource.sort = this.sort;        
     },
     error => console.error(error)
  ); 

Answer 4

这是我解决问题的方法，以防万一有人需要它：

 @ViewChild(MatSort) sort: MatSort;
 
 @ViewChild(MatPaginator) set matPaginator(mp: MatPaginator) {
    this.paginator = mp;
    this.setDataSourceAttributes();
    }
    
 dataSource = new MatTableDataSource();  
 displayedColumns: string[] = ['call_start_time', 'call_agent_login_id', 'call_cli', 'call_service_name', 'call_type', 'Play'];
 
 setDataSourceAttributes() {
    this.dataSource.paginator = this.paginator;
    this.dataSource.sort = this.sort;
  }
  
  onSubmit() {

    this.webService.CallDetails(deatails)
      .subscribe(
        response => {
        
          this.Model = response;
          this.Result = this.Model.log;
          this.dataSource = new MatTableDataSource(this.Result);
        },
        
        (error) => console.error(error)
      );

  }

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

  <ng-container matColumnDef="call_start_time" class="text-center">
    <th mat-header-cell *matHeaderCellDef mat-sort-header> StartTime </th>
    <td mat-cell *matCellDef="let row" style="width: 25%"> {{row.call_start_time | date:'dd-MM-yyyy HH:mm:ss'}}
    </td>
  </ng-container>

  <ng-container matColumnDef="call_agent_login_id">
    <th mat-header-cell *matHeaderCellDef mat-sort-header> Agent </th>
    <td mat-cell *matCellDef="let row"> {{row.call_agent_login_id}} </td>
  </ng-container>

  <ng-container matColumnDef="call_cli">
    <th mat-header-cell *matHeaderCellDef mat-sort-header> CLI </th>
    <td mat-cell *matCellDef="let row" style="width: 15%"> {{row.call_cli}} </td>
  </ng-container>

  <ng-container matColumnDef="call_service_name">
    <th mat-header-cell *matHeaderCellDef mat-sort-header> Campaign </th>
    <td mat-cell *matCellDef="let row" style="width:20px;"> {{row.call_service_name}} </td>
  </ng-container>
  
  <ng-container matColumnDef="call_type">
    <th mat-header-cell *matHeaderCellDef mat-sort-header style="max-width:20px !important"> CallType </th>
    <td mat-cell *matCellDef="let row"> {{row.call_type}} </td>
  </ng-container>
  <ng-container matColumnDef="Play">
    <th mat-header-cell *matHeaderCellDef> Play</th>
    <td mat-cell *matCellDef="let row">

      <button *ngIf="row.filepath" (click)="openDialog(row.filepath)" mat-stroked-button style="min-width:1%;" color="primary"><img src="../../assets/Images/play.png" /> </button>

      <button *ngIf="!row.filepath" mat-raised-button disabled style="min-width:1%;" color="primary"><img src="../../assets/Images/unavailable.png" /></button>
    </td>

  </ng-container>

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

<mat-paginator [pageSizeOptions]="[5,10, 25]"></mat-paginator>

我确保 matColumDef 和绑定名称相同，以便排序正常进行。