4

我正在使用 ngx-datatable 并尝试向我的代码添加过滤功能，但它根本不起作用。

这是我的代码：

import {Component, OnInit, ViewChild, ViewEncapsulation} from '@angular/core';
import {NavbarService} from '../../Services/navbar.service';
import {DataService} from '../../Services/data.service';
import {DatatableComponent} from '@swimlane/ngx-datatable';
import {forEach} from '@angular/router/src/utils/collection';

@Component({
  selector: 'app-student',
  templateUrl: './student.component.html',
  styleUrls: ['./student.component.css'],
  encapsulation: ViewEncapsulation.None
})
export class StudentComponent implements OnInit {
  rows: Student[];
  @ViewChild('myTable') table: any;

  students: Student[];
  temp = [];

  constructor(private nav: NavbarService, public dataService: DataService) {
    this.dataService.getStudents().subscribe(Students => {
      this.Students = [...Students];
      this.rows = Students;
    });
  }

  ngOnInit() {
    this.nav.show();
  }

  onPage(event: Event) {
    clearTimeout(this.timeout);
    this.timeout = setTimeout(() => {
      console.log('paged!', event);
    }, 100);
  }

  toggleExpandRow(row) {
    console.log('Toggled Expand Row!', row);
    this.table.rowDetail.toggleExpandRow(row);
  }

  onDetailToggle(event) {
    console.log('Detail Toggled', event);
  }

  updateFilter(event) {
    const val = event.target.value.toLowerCase();
    this.rows = this.students.filter(row =>
      row.AspNetUsers.Nom.toLowerCase().indexOf(val) !== -1 || !val
    );
    this.table.offset = 0;
  }
}

就像在文档代码中一样，我必须在我的输入updateFilter中添加一个函数来获取输入的值，然后有一个函数可以根据插入的值过滤临时数组但是这个函数根本不起作用我得到Cannot read property 'Name' of undefined我检查了使用控制台和调试它们数组的值似乎数组是正确的并且有值，但我不知道为什么过滤器函数什么都不返回。我尝试添加尝试 - 捕获问题消失但过滤功能过滤任何内容。

编辑：student.component.html 的代码

<div class="container">
  <div class="row">
    <div class="col">
      <form>
        <div class="input-group">
          <input class="form-control" id="search"  name="search" (keyup)='updateFilter($event)' placeholder="Rechercher">
          <div class="input-group-addon"><i class="material-icons">search</i></div>
        </div>
      </form>
    </div>
  </div>
  <div class="row mt-3">
    <div class="col">
      <ngx-datatable
        #myTable
        class='material expandable'
        [columnMode]="'force'"
        [headerHeight]="50"
        [footerHeight]="50"
        [rowHeight]="50"
        [rows]='rows'
        [limit]="20"
        (page)="onPage($event)">

        <ngx-datatable-row-detail [rowHeight]="120" #myDetailRow (toggle)="onDetailToggle($event)">
          <ng-template let-row="row" let-expanded="expanded" ngx-datatable-row-detail-template>
            <div class="container">
              <table class="table">
                <tr>
                  <th>Email</th>
                  <td>{{row.AspNetUsers.Email}}</td>
                </tr>
                <tr>
                  <th>Adresse</th>
                  <td>{{row.ADRESSE}}</td>
                </tr>
              </table>
            </div>
          </ng-template>
        </ngx-datatable-row-detail>

        <ngx-datatable-column
          [width]="50"
          [resizeable]="false"
          [sortable]="false"
          [draggable]="false"
          [canAutoResize]="false">
          <ng-template let-row="row" let-expanded="expanded" ngx-datatable-cell-template>
            <a
              href="javascript:"
              [class.datatable-icon-right]="!expanded"
              [class.datatable-icon-down]="expanded"
              title="Expand/Collapse Row"
              (click)="toggleExpandRow(row)">
            </a>
          </ng-template>
        </ngx-datatable-column>

        <ngx-datatable-column name="ID" [width]="100">
          <ng-template let-row="row" ngx-datatable-cell-template>
            {{row.studentID}}
          </ng-template>
        </ngx-datatable-column>

        <ngx-datatable-column name="First Name" [width]="100">
          <ng-template let-row="row" ngx-datatable-cell-template>
            {{row.AspNetUsers.Name}}
          </ng-template>
        </ngx-datatable-column>

        <ngx-datatable-column name="Last Name" [width]="100">
          <ng-template let-row="row" ngx-datatable-cell-template>
            {{row.AspNetUsers.LastName}}
          </ng-template>
        </ngx-datatable-column>

        <ngx-datatable-column name="Special Code" [width]="100">
          <ng-template let-row="row" ngx-datatable-cell-template>
            {{row.AspNetUsers.SpecialCode}}
          </ng-template>
        </ngx-datatable-column>


        <ngx-datatable-column name="PhoneNumber" [width]="100">
          <ng-template let-row="row" ngx-datatable-cell-template>
            {{row.AspNetUsers.PhoneNumber}}
          </ng-template>
        </ngx-datatable-column>

      </ngx-datatable>
    </div>
  </div>
</div>

编辑 2：我发现了为什么会出现错误，缺少一些名称（它们为空），并且在过滤器内部，如果它为空，就会出现问题。我添加了 student !== null 但问题仍然存在。

4

1 回答 1

1

这显然是 HTML 中的一个错误，它破坏了您的过滤。将安全导航运算符放入行的每个插值中，例如：

{{row.AspNetUsers?.Name}}
{{row.AspNetUsers?.SpecialCode}}

等等。应该删除错误，以便您能够更深入地调试。

于 2017-09-04T23:09:57.870 回答