角度matSort不排序

问题描述

我无法将matSort导入到matTable中.

I'm having trouble with importing matSort into my matTable.

我正在向您提供我的代码:

I'm providing you with my code:

dashboard.component.ts

import {Component, ViewChild} from '@angular/core';
import {UserService} from "../user.service";
import {DohvatMantisaService} from "../dohvat-mantisa.service";
import {Mantisi} from "../Mantisi";
import {Observable} from "rxjs/Observable";
import {DataSource} from "@angular/cdk/collections";
import 'rxjs/add/observable/of';
import 'rxjs/add/operator/startWith';
import 'rxjs/add/observable/merge';
import {MatSort} from '@angular/material';
@Component({
  selector: 'app-dashboard',
  templateUrl: './dashboard.component.html',
  styleUrls: ['./dashboard.component.css']
})
export class DashboardComponent{
  displayedColumns = ['projekt', 'manits', 'kategorija','ozbiljnost','datum_prijave','postavio','odjel','postavio','naziv','status','planirana_isporuka'];
  constructor(private user:UserService, private dohvatMantisa:DohvatMantisaService) {
  }
  dataSource: TableDataSource | null;
  mantisi: Mantisi[];
  name = this.user.getUsername();
  @ViewChild(MatSort) sort: MatSort;
  ngOnInit() {
    this.dataSource = new TableDataSource(this.dohvatMantisa,this.sort);
  }
}

export class TableDataSource extends DataSource<Mantisi>{
  constructor(private mantisiDS: DohvatMantisaService,private sort: MatSort){
    super();
  }
  connect(): Observable<Mantisi[]> {
    const displayDataChanges = [
      this.mantisiDS.dohvatiMantise(),
      this.sort.sortChange,
    ];

    return Observable.merge(...displayDataChanges).map(() => {
      return this.getSortedData();
    });
  }
  disconnect() {}

  getSortedData(): Mantisi[]{
    const data = this.mantisiDS.prikazMantisa().slice();
    if (!this.sort.active || this.sort.direction == '') { return data; }
    return data.sort((a, b) => {
      let propertyA: number|string = '';
      let propertyB: number|string = '';
      switch (this.sort.active) {
        case 'projekt': [propertyA, propertyB] = [a.projekt, b.projekt]; break;
        case 'manits': [propertyA, propertyB] = [a.manits, b.manits]; break;
        case 'kategorija': [propertyA, propertyB] = [a.kategorija, b.kategorija]; break;
        case 'ozbiljnost': [propertyA, propertyB] = [a.ozbiljnost, b.ozbiljnost]; break;
        case 'datum_prijave': [propertyA, propertyB] = [a.datum_prijave, b.datum_prijave]; break;
        case 'postavio': [propertyA, propertyB] = [a.postavio, b.postavio]; break;
        case 'naziv': [propertyA, propertyB] = [a.naziv, b.naziv]; break;
        case 'status': [propertyA, propertyB] = [a.status, b.status]; break;
        case 'planirana_isporuka': [propertyA, propertyB] = [a.planirana_isporuka, b.planirana_isporuka]; break;
      }

      let valueA = isNaN(+propertyA) ? propertyA : +propertyA;
      let valueB = isNaN(+propertyB) ? propertyB : +propertyB;

      return (valueA < valueB ? -1 : 1) * (this.sort.direction == 'asc' ? 1 : -1);
    });
  }
}

这是我的服务: dohvatMantisaService

import { Injectable } from '@angular/core';
import {Http, Response, RequestOptions, Headers} from "@angular/http";
import {Observable} from "rxjs/Observable";
import {Mantisi} from "./Mantisi";
import 'rxjs';
import 'rxjs/operator/map';
import 'rxjs/operator/do';

@Injectable()
export class DohvatMantisaService {
  constructor(public http:Http) { }
  result: Mantisi[];
  dohvatiMantise(): Observable<Mantisi[]>{
    return this.http.get('/mantis/getMantisReport').map(this.extractData);
  }
  private extractData(response: Response) {
    let body = response.json();
    return body || {};
  }

  prikazMantisa(): Mantisi[]{
    this.dohvatiMantise().subscribe(res => this.result = res);
    return this.result;
  }
}

然后我为您提供我的dashboard.component.html matSort行:

And im providing you with my dashboard.component.html matSort row:

<mat-table #table [dataSource]="dataSource" class="example-table" matSort>

这里的主要问题是数据是从http请求加载和获取的，但是在控制台中却出现如下错误:

The main problem here is that data is loaded and acquired from http request but I'm getting errors in console something like this:

它告诉我 this.sort.sortChange 未定义.我搜索了所有互联网，却找不到正确的答案.希望你能帮助我.

It tells me that this.sort.sortChange is undefined.I searched all bit of internet and couldn't find proper answer. Hope you can help me with that.

推荐答案

我已经找到了解决此问题的方法.

I've found solution for this problem.

主要问题是表格是在数据到达之前呈现的.我首先加载了数据，并将其像源一样发送到dataSource构造函数.之后，问题消失了.异步http.get和服务就是这样.

The main problem was that table was rendered before data arrived. I've loaded data first and sent it like source to dataSource constructor. After it, problem disappeared. That's the thing with async http.get and services.

感谢您的帮助.

fetchData(id){
  this.fetch.getProcesses(id).subscribe(result => {
    this.processes = result;
    this.dataSource = new TableDataSource(this.processes);
    Observable.fromEvent(this.filter.nativeElement, 'keyup')
      .debounceTime(150)
      .distinctUntilChanged()
      .subscribe(() => {
        if (!this.dataSource) {
          return;
        }
        this.dataSource.filter = this.filter.nativeElement.value;
      });
  });
}




export class TableDataSource extends DataSource<Proces>{
  _filterChange = new BehaviorSubject('');
  get filter(): string {
    return this._filterChange.value;
  }
  set filter(filter: string) {
    this._filterChange.next(filter);
  }
  filteredData: any =[];

  constructor(private processes:Proces[]){
    super();
  }
  connect(): Observable<Proces[]>{
    const displayDataChanges = [
      this.processes,
      this._filterChange,
    ];
    return Observable.merge(...displayDataChanges).map(() => {
      this.filteredData = this.processes.slice().filter((item: Proces) => {
        const searchStr = (item.name).toLowerCase();
        return searchStr.indexOf(this.filter.toLowerCase()) !== -1;

      });
      return this.filteredData;
    })
  }
  disconnect(){}
}



      <div class="header">
    <mat-form-field floatPlaceholder="never">
      <input matInput #filter placeholder="Pretraži procese">
    </mat-form-field>
  </div>
  <mat-table #table [dataSource]="dataSource" class="table-mantis" matSort>

    <ng-container matColumnDef="col1">
      <mat-header-cell *matHeaderCellDef class="table-header-cell" mat-sort-header> Name</mat-header-cell>
      <mat-cell *matCellDef="let row" class="example-cell" > {{row.nazivProcesa}} </mat-cell>
    </ng-container>

    <ng-container matColumnDef="col2">
      <mat-header-cell *matHeaderCellDef class="table-header-cell" mat-sort-header> Cell 2</mat-header-cell>
      <mat-cell *matCellDef="let row" class="example-cell" > {{row.nazivVlasnika
        }} </mat-cell>
    </ng-container>

    <ng-container matColumnDef="col3">
      <mat-header-cell *matHeaderCellDef class="table-header-cell" mat-sort-header> Cell 3</mat-header-cell>
      <mat-cell *matCellDef="let row" class="example-cell" > {{row.interniAkt}} </mat-cell>
    </ng-container>

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

这篇关于角度matSort不排序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！