Question

新手...

我正在尝试在材料表中实现多列过滤器功能。我确实有一个全局过滤器，但现在我需要使用自定义数据源添加列过滤器。

有我的ExampleDataSource

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

  filteredData: UserData[] = [];
  renderedData: UserData[] = [];

  constructor(private _exampleDatabase: ExampleDatabase,
              private _paginator: MatPaginator,
              private _sort: MatSort) {
    super();

    this._filterChange.subscribe(() => this._paginator.pageIndex = 0);
  }

  /** Connect function called by the table to retrieve one stream containing the data to render. */
  connect(): Observable<UserData[]> {
    // Listen for any changes in the base data, sorting, filtering, or pagination
    const displayDataChanges = [
      this._exampleDatabase.dataChange,
      this._sort.sortChange, 
      this._filterChange,
      this._paginator.page,
    ];

    return Observable.merge(...displayDataChanges).map(() => {
      // Filter data
      this.filteredData = this._exampleDatabase.data.slice().filter((item: UserData) => {
        let searchStr = (item.name + item.color).toLowerCase();
        return searchStr.indexOf(this.filter.toLowerCase()) != -1;
      });

      // Sort filtered data
      const sortedData = this.sortData(this.filteredData.slice());

      // Grab the page's slice of the filtered sorted data.
      const startIndex = this._paginator.pageIndex * this._paginator.pageSize;
      this.renderedData = sortedData.splice(startIndex, this._paginator.pageSize);
      return this.renderedData;
    });
  }

  disconnect() {}

  /** Returns a sorted copy of the database data. */
  sortData(data: UserData[]): UserData[] {
    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 'userId': [propertyA, propertyB] = [a.id, b.id]; break;
        case 'userName': [propertyA, propertyB] = [a.name, b.name]; break;
        case 'progress': [propertyA, propertyB] = [a.progress, b.progress]; break;
        case 'color': [propertyA, propertyB] = [a.color, b.color]; break;
      }

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

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

我该怎么做？

有一个堆栈闪电项目： https://stackblitz.com/edit/angular-material2-table-uhezq7

Angular DataSource多个过滤器

0 个答案: