自定义日期过滤器未返回任何Angular 8

问题描述

我对Angular不太熟悉，一直在尝试为Mat Table的createDate列创建一个日期范围过滤器。当我点击过滤器按钮时，它只是填充了一个空白表。过滤器的代码在构造函数和datFil（）中。我尝试了几种不同的方法，但无济于事。任何帮助将不胜感激！

TypeScipt

import { HttpClient,HttpHeaders } from '@angular/common/http';
import { Observable } from 'rxjs';
import { MatSort} from '@angular/material/sort';
import {MatPaginator} from '@angular/material/paginator';
import {MatTableDataSource} from '@angular/material/table';
import { MatDialog,MatDialogConfig } from '@angular/material';
import { DialogDataComponent } from "../dialog-data/dialog-data.component";
import { DatePipe } from '@angular/common';
import {FormControl,FormGroup} from '@angular/forms';



export interface User {
  id: number;
  name: string;
  distributor: string;
  storeNum: number;
  poNum: number;
  createDate: Date;
  recDate: Date;
  totalUnits: number;
}


@Component({
  selector: 'app-order-table',templateUrl: './order-table.component.html',styleUrls: ['./order-table.component.scss']
})
export class OrderTableComponent implements OnInit{
  [x: string]: any;
  public users: User[];
  public begin: string;
  public end: string;
  private usersUrl = 'api/users';

  // public doFilter = (value: string) => {
  //   console.log("testing: " + value);

  //   this.dataSource.filter = value.trim().toLocaleLowerCase();
  // }


  displayedColumns: string[] = ['name','distributor','storeNum','poNum','createDate','recDate','totalUnits'];
  pipe: DatePipe;
  dataSource = new MatTableDataSource<User>(this.users);


  @ViewChild(MatPaginator,{static: false}) paginator: MatPaginator;
  @ViewChild(MatSort,{static: true}) sort: MatSort;

  storeFilter = new FormControl();
  poFilter = new FormControl();
  nameFilter = new FormControl();
  datefilter = new FormControl();


  filteredValues = {
    name: '',distributor: '',storeNum: '',poNum: '',createDate: '',recDate: '',totalUnits: ''
  };




  constructor(private http: HttpClient,public dialog: MatDialog) {
    this.dataSource.filterPredicate = (data,filter) =>{
      if (this.begin && this.end) {
        return data.createDate >= this.fromDate && data.createDate <= this.toDate;
      }
      return true;
    }
  };


  ngAfterViewInit() {
    this.dataSource.paginator = this.paginator;
    this.dataSource.sort = this.sort;
  }

  ngOnInit() {
    this.pipe = new DatePipe('en');
    this.getUsers().subscribe(data => this.dataSource.data = data)
    this.dataSource.paginator = this.paginator;

    this.storeFilter.valueChanges.subscribe((storeFilterValue) => {
      this.filteredValues['storeNum'] = storeFilterValue;
      this.dataSource.filter = JSON.stringify(this.filteredValues);
    });

    this.poFilter.valueChanges.subscribe((poFilterValue) => {
      this.filteredValues['poNum'] = poFilterValue;
      this.dataSource.filter = JSON.stringify(this.filteredValues);
    });

    this.nameFilter.valueChanges.subscribe((nameFilterValue) => {
      this.filteredValues['name'] = nameFilterValue;
      this.dataSource.filter = JSON.stringify(this.filteredValues);
    });



    this.dataSource.filterPredicate = this.customFilterPredicate();
    console.log(this.dataSource);


  }


  dateFil(filter) {
    console.log(this.begin);
    console.log(this.end);
    this.dataSource.filter = ''+Math.random();

  }

HTML

<div>
  <input matInput class="daterange" (keypress)="keyPressNumbersDate($event)" [formControl]= "datefilter" [(ngModel)]= "begin" placeholder="mm/dd/yyyy"> - <input matInput class="daterange" (keypress)="keyPressNumbersDate($event)" [(ngModel)]= "end" placeholder="mm/dd/yyyy">
  <button (click)= 'dateFil()'>Filter</button>
</div>

解决方法

您可以这样过滤数据源。

 dateFil() {
   dataSource = new MatTableDataSource<User>(this.users.filter(x=>x.createDate>=this.begin && x.createDate<=this.end));
  }

我已经创建了一个演示，您可以找到here