成员admin.service.ts

import { AngularFireDatabase,FirebaseListObservable } from 'angularfire2/database';
import { FirebaseApp } from 'angularfire2';
import { Inject,Injectable } from '@angular/core';

import { MemberModel } from './member-admin.model';
import { SuccessService } from '../../../shared/success.service';

// Data Table imports.
import { MdPaginator } from '@angular/material';
import { DataSource } from '@angular/cdk';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/of';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import 'rxjs/add/operator/startWith';
import 'rxjs/add/observable/merge';
import 'rxjs/add/observable/combineLatest';
import 'rxjs/add/operator/map';


@Injectable()
export class MembersAdminService {

  private membersData$: FirebaseListObservable<MemberModel[]>;

  constructor(
    public af: AngularFireDatabase,private successService: SuccessService,// For Create and Update functions.
    @Inject(FirebaseApp) fb) {
      this.membersData$= af.list('Members');
    }

// ... CRUD stuff not relevant to the MD Table ...


// *** MD DATA TABLE SERVICES. ***


@Injectable()
export class MemberDatabase {

    /* Stream that emits whenever the data has been modified. */
    public dataChange: BehaviorSubject<MemberModel[]> = new BehaviorSubject<MemberModel[]>([]);
    get data(): MemberModel[] {
        return this.dataChange.value; }

    // Connection to remote db.
    private database = this.memberAdminService.af.list('Members',{
        query: {
            orderByChild: 'lastName'
        }
    });
    public getMembers(): FirebaseListObservable<MemberModel[]> {
        return this.database;
    }


    constructor(private memberAdminService: MembersAdminService) {
        this.getMembers()
            .subscribe(data => this.dataChange.next(data));
    }
}


@Injectable()
export class MembersAdminSource extends DataSource<MemberModel> {


    constructor(
        private memberDatabase: MemberDatabase,private paginator: MdPaginator) {
        super();
    }


    /** Connect function called by the table to retrieve one stream containing the data to render. */
    connect(): Observable<MemberModel[]> {

      const displayDataChanges = [
          this.memberDatabase.dataChange,this.paginator.page,];

      return Observable
          .merge(...displayDataChanges) // Convert object to array with spread Syntax.
          .map(() => {
              const dataSlice = this.memberDatabase.data.slice(); // Data removed from viewed page.

              // Get the page's slice per pageSize setting.
              const startIndex = this.paginator.pageIndex * this.paginator.pageSize;

              const dataLength = this.paginator.length;  // This is for the counter on the DOM.

              return dataSlice.splice(startIndex,this.paginator.pageSize);
          });
    }
    disconnect() {}
}

全members.component.ts

在ngOnInit和类属性中进行了一些重构.

import { Component,OnInit,ViewChild } from '@angular/core';
import { Router } from '@angular/router';
import { Subject } from 'rxjs/Subject';

// For MD Data Table.
import { MdPaginator } from '@angular/material';
import { MembersAdminService,MembersAdminSource,MemberDatabase } from './member-admin.service';

import { ConfirmService } from '../../../shared/confirm.service';
import { MemberModel } from './member-admin.model';


@Component({
  selector: 'app-all-members',templateUrl: './all-members.component.html'
})


export class AllMembersComponent implements OnInit {

  membersData: MemberModel[];
  private result: boolean;
  allMembers: MemberModel[];

  // For search
  startAt = new Subject();
  endAt = new Subject();
  lastKeypress: 0;

    // For MD data table.

  // private memberDatabase = new MemberDatabase();  // Requires a param but? Moved to constructor.
  private dataSource: MembersAdminSource | null;
  private displayedColumns = [
      'firstName','lastName','mainSkillTitle','mainSkills','delete','key'
  ];

  @ViewChild(MdPaginator)
  paginator: MdPaginator;

  public dataLength: any; // For member counter on DOM.

  constructor(
      private membersAdminService: MembersAdminService,private memberDatabase: MemberDatabase,private router: Router,private confirmService: ConfirmService
  ) {}

  ngOnInit() {

      this.memberDatabase.getMembers()
          .subscribe(members => {
              this.dataSource = new MembersAdminSource(this.memberDatabase,this.paginator);
              this.dataLength = members;
          });
    }

全members.component.html

注意我在行中有按钮用于删除和编辑,它们工作正常.诀窍是您需要隐藏列中的数据库密钥.

<md-table #table [dataSource]="dataSource">

      <!-- First Name Column -->
      <ng-container cdkColumnDef="firstName">
        <md-header-cell *cdkHeaderCellDef> First Name </md-header-cell>
        <md-cell *cdkCellDef="let row"> {{row.firstName}} </md-cell>
      </ng-container>

      <!-- Las Name Column -->
      <ng-container cdkColumnDef="lastName">
        <md-header-cell *cdkHeaderCellDef> Last Name </md-header-cell>
        <md-cell *cdkCellDef="let row">  {{row.lastName}} </md-cell>
      </ng-container>

      <!-- Title Column -->
      <ng-container cdkColumnDef="mainSkillTitle">
        <md-header-cell *cdkHeaderCellDef> Title </md-header-cell>
        <md-cell *cdkCellDef="let row"> {{row.mainSkillTitle}} </md-cell>
      </ng-container>

      <!-- Main Skills Column -->
      <ng-container cdkColumnDef="mainSkills">
        <md-header-cell *cdkHeaderCellDef> Main Skills </md-header-cell>
        <md-cell *cdkCellDef="let row"> {{row.mainSkills}} </md-cell>
      </ng-container>

      <!-- Delete Buttons Column -->
      <ng-container cdkColumnDef="delete">
        <md-header-cell *cdkHeaderCellDef> Delete / Edit </md-header-cell>
        <md-cell *cdkCellDef="let row">
          <button (click)="deleteMember(row.$key)">Delete</button>
          <button (click)="goToDetailPage(row.$key)">Edit</button>
        </md-cell>
      </ng-container>

      <!-- Database key Column -->

      <ng-container cdkColumnDef="key">
        <md-header-cell *cdkHeaderCellDef class="hiddenField"> Key </md-header-cell>
        <md-cell *cdkCellDef="let row" class="hiddenField"> {{row.$key}} </md-cell>
      </ng-container>


      <md-header-row *cdkHeaderRowDef="displayedColumns"></md-header-row>
      <md-row *cdkRowDef="let row; columns: displayedColumns;"></md-row>


    </md-table>
    <md-paginator #paginator
                  [length]="dataLength?.length"
                  [pageIndex]="0"
                  [pageSize]="5"
                  [pageSizeOptions]="[5,10,25,100]">
    </md-paginator>