具有列值的材料表数据源过滤器

Question

如何使用特定列过滤材料数据表？

public dataSource;


this.dataSource = new MatTableDataSource(this.items);
        this.dataSource.filterPredicate = function customFilter(data , filter:string ): boolean {
            return (data.name.startsWith(filter));
        }

applyFilter(filterValue: string) {
    filterValue = filterValue.trim(); // Remove whitespace
    filterValue = filterValue.toLowerCase(); // MatTableDataSource defaults to lowercase matches
    this.dataSource.filter = filterValue;
}

上面的代码不起作用，当我键入返回时没有数据匹配。

Answer 1

来自文档。

  

例如，数据对象{id：123，name：＆＃39; Mr。 Smith＆＃39;，favoriteColor：＆＃39; blue＆＃39;}将减少到123mr。 smithblue。如果您的过滤字符串是蓝色的，那么它将被视为匹配，因为它包含在缩减字符串中，并且该行将显示在表格中。

     

要覆盖默认过滤行为，请使用自定义filterPredicate   可以设置一个函数，它接受一个数据对象和过滤字符串   如果数据对象被视为匹配，则返回true。

如果您只想使用过滤器特定列，则需要覆盖filterPredicate，答案已经是here。

这是过滤的工作示例。

表格过滤-example.html的

<div class="example-container mat-elevation-z8">
  <div class="example-header">
    <mat-form-field>
      <input matInput (keyup)="applyFilter($event.target.value)" placeholder="Filter">
    </mat-form-field>
  </div>

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

    <!-- Position Column -->
    <ng-container matColumnDef="position">
      <mat-header-cell *matHeaderCellDef> No. </mat-header-cell>
      <mat-cell *matCellDef="let element"> {{element.position}} </mat-cell>
    </ng-container>

    <!-- Name Column -->
    <ng-container matColumnDef="name">
      <mat-header-cell *matHeaderCellDef> Name </mat-header-cell>
      <mat-cell *matCellDef="let element"> {{element.name}} </mat-cell>
    </ng-container>

    <!-- Weight Column -->
    <ng-container matColumnDef="weight">
      <mat-header-cell *matHeaderCellDef> Weight </mat-header-cell>
      <mat-cell *matCellDef="let element"> {{element.weight}} </mat-cell>
    </ng-container>

    <!-- Symbol Column -->
    <ng-container matColumnDef="symbol">
      <mat-header-cell *matHeaderCellDef> Symbol </mat-header-cell>
      <mat-cell *matCellDef="let element"> {{element.symbol}} </mat-cell>
    </ng-container>

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

表格过滤-example.ts

  import {Component} from '@angular/core';
    import {MatTableDataSource} from '@angular/material';

    /**
     * @title Table with filtering
     */
    @Component({
      selector: 'table-filtering-example',
      styleUrls: ['table-filtering-example.css'],
      templateUrl: 'table-filtering-example.html',
    })
    export class TableFilteringExample {
      displayedColumns = ['position', 'name', 'weight', 'symbol'];
      dataSource = new MatTableDataSource(ELEMENT_DATA);

      applyFilter(filterValue: string) {
        filterValue = filterValue.trim(); // Remove whitespace
        filterValue = filterValue.toLowerCase(); // MatTableDataSource defaults to lowercase matches
        this.dataSource.filter = filterValue;
      }
    }

    export interface Element {
      name: string;
      position: number;
      weight: number;
      symbol: string;
    }

    const ELEMENT_DATA: Element[] = [
      {position: 1, name: 'Hydrogen', weight: 1.0079, symbol: 'H'},
      {position: 2, name: 'Helium', weight: 4.0026, symbol: 'He'},
      {position: 3, name: 'Lithium', weight: 6.941, symbol: 'Li'},
      {position: 4, name: 'Beryllium', weight: 9.0122, symbol: 'Be'},
      {position: 5, name: 'Boron', weight: 10.811, symbol: 'B'},
      {position: 6, name: 'Carbon', weight: 12.0107, symbol: 'C'},
      {position: 7, name: 'Nitrogen', weight: 14.0067, symbol: 'N'},
      {position: 8, name: 'Oxygen', weight: 15.9994, symbol: 'O'},
      {position: 9, name: 'Fluorine', weight: 18.9984, symbol: 'F'},
      {position: 10, name: 'Neon', weight: 20.1797, symbol: 'Ne'},
      {position: 11, name: 'Sodium', weight: 22.9897, symbol: 'Na'},
      {position: 12, name: 'Magnesium', weight: 24.305, symbol: 'Mg'},
      {position: 13, name: 'Aluminum', weight: 26.9815, symbol: 'Al'},
      {position: 14, name: 'Silicon', weight: 28.0855, symbol: 'Si'},
      {position: 15, name: 'Phosphorus', weight: 30.9738, symbol: 'P'},
      {position: 16, name: 'Sulfur', weight: 32.065, symbol: 'S'},
      {position: 17, name: 'Chlorine', weight: 35.453, symbol: 'Cl'},
      {position: 18, name: 'Argon', weight: 39.948, symbol: 'Ar'},
      {position: 19, name: 'Potassium', weight: 39.0983, symbol: 'K'},
      {position: 20, name: 'Calcium', weight: 40.078, symbol: 'Ca'}, ];

您可以使用filterPredicate过滤特定列，如下所示：

  ngOnInit() {
    this.dataSource.filterPredicate = (data: Element, filter: string) => {
      return data.name == filter;
     };
   }
 applyFilter(filterValue: string) {
    // filterValue = filterValue.trim(); // Remove whitespace
    // filterValue = filterValue.toLowerCase(); // MatTableDataSource defaults to lowercase matches
    this.dataSource.filter = filterValue;
  }

我更改了applyFilter()并添加了ngOnInit()。现在它只使用名称列和完全相同的值(==)

Answer 2

您可以利用mat-table-filter进行复杂的过滤。

为了过滤列，您定义一个示例实体，并仅填充属于相应列的属性。

这里是一个示例：https://stackblitz.com/github/HalitTalha/mat-table-filter-example

Answer 3

您可以按照动态列进行过滤，例如没有硬编码的列名，请执行以下操作：

// On input focus: setup filterPredicate to only filter by input column
setupFilter(column: string) {
  this.dataSource.filterPredicate = (d: TableDataSourceType, filter: string) => {
    const textToSearch = d[column] && d[column].toLowerCase() || '';
    return textToSearch.indexOf(filter) !== -1;
  };
}

applyFilter(filterValue: string) {
  this.dataSource.filter = filterValue.trim().toLowerCase();
}

在模板中，您可以具有以下内容：

<ng-container matColumnDef="item-filter">
  <th mat-header-cell *matHeaderCellDef>
    <input (keyup)="applyFilter($event.target.value)" (focus)="setupFilter('name')" />
  </th>
</ng-container>

或更复杂的示例，通过每列过滤动态创建标题行：

<table mat-table [dataSource]="dataSource">
   <ng-container *ngFor="let filterCol of ['names', 'age', 'address']">
     <ng-container matColumnDef="filterCol">
       <th mat-header-cell *matHeaderCellDef>
         <input (keyup)="applyFilter($event.target.value)" (focus)="setupFilter(filterCol)"/>
       </th>
     </ng-container>
   </ng-container>

   <tr mat-header-row *matHeaderRowDef="['names', 'age', 'address']"></tr>
</table>

请注意，您不能具有多个具有相同键的标题行，因此这行不通：

<tr mat-header-row *matHeaderRowDef="['names', 'age', 'address']"></tr>
<tr mat-header-row *matHeaderRowDef="['names', 'age', 'address']"></tr>

Answer 4

使用 filterPredicate 为材料表创建自定义过滤器选择框，并使用 customFilter（）方法覆盖

演示Link

来源Link

        ...
        ngOnInit() {
            this.getRemoteData();

            // Overrride default filter behaviour of Material Datatable
            this.dataSource.filterPredicate = this.createFilter();
        }
        ...

        // Custom filter method fot Angular Material Datatable
        createFilter() {
            let filterFunction = function (data: any, filter: string): boolean {
            let searchTerms = JSON.parse(filter);
            let isFilterSet = false;
            for (const col in searchTerms) {
                if (searchTerms[col].toString() !== '') {
                isFilterSet = true;
                } else {
                delete searchTerms[col];
                }
            }

            let nameSearch = () => {
                let found = false;
                if (isFilterSet) {
                for (const col in searchTerms) {
                    searchTerms[col].trim().toLowerCase().split(' ').forEach(word => {
                    if (data[col].toString().toLowerCase().indexOf(word) != -1 && isFilterSet) {
                        found = true
                    }
                    });
                }
                return found
                } else {
                return true;
                }
            }
            return nameSearch()
            }
            return filterFunction
        }

Answer 5

applyFilter(event: Event) {
    const filterValue = (event.target as HTMLInputElement).value;
    if (filterValue == '') {
        this.tablesource = this.filteresource;
    }
    else if (filterValue != '') {
        this.tablesource = this.filteresource.filter(e =>
            e.galleryDesc.toLowerCase().includes(filterValue.trim().toLowerCase()) ||
            e.galleryName.toLowerCase().includes(filterValue.trim().toLowerCase()) ||
            e.status.toString().toLowerCase().includes(filterValue.trim().toLowerCase()) ||
            e.createdDate.toLowerCase().includes(filterValue.trim().toLowerCase())
      );
    }
}

Answer 6

app.compont.html

 <mat-form-field floatPlaceholder="never">
            <input matInput placeholder="Filter name" (keyup)="applyFilter($event.target.value)">
          </mat-form-field>
        <mat-table matSort  [dataSource]="dataSource" class="mat-elevation-z8">
           
            <!-- Position Column -->
            <ng-container matColumnDef="position">
              <mat-header-cell *matHeaderCellDef mat-sort-header> No. </mat-header-cell>
              <mat-cell *matCellDef="let element"> {{element.position}} </mat-cell>
            </ng-container>
          
            <!-- Name Column -->
            <ng-container matColumnDef="name">
              <mat-header-cell *matHeaderCellDef mat-sort-header> Name </mat-header-cell>
              <mat-cell *matCellDef="let element"> {{element.name}} </mat-cell>
            </ng-container>
          
            <!-- Weight Column -->
            <ng-container matColumnDef="weight">
              <mat-header-cell *matHeaderCellDef mat-sort-header> Weight </mat-header-cell>
              <mat-cell *matCellDef="let element"> {{element.weight}} </mat-cell>
            </ng-container>
          
            <!-- Symbol Column -->
            <ng-container matColumnDef="symbol">
              <mat-header-cell *matHeaderCellDef mat-sort-header> Symbol </mat-header-cell>
              <mat-cell *matCellDef="let element"> {{element.symbol}} </mat-cell>
            </ng-container>
          
            <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
            <mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>
          </mat-table>
          <mat-paginator [pageSize]="5" [pageSizeOptions]="[5, 10, 15]" showFirstLastButtons></mat-paginator>

app.component.ts

import { Component, OnInit, ViewChild } from '@angular/core';
import { MatPaginator } from '@angular/material/paginator';
import { MatTableDataSource } from '@angular/material/table';
import { MatSort } from '@angular/material/sort';
export interface PeriodicElement {
  name: string;
  position: number;
  weight: number;
  symbol: string;
}

const ELEMENT_DATA: PeriodicElement[] = [
  { position: 1, name: 'Hydrogen', weight: 1.0079, symbol: 'H' },
  { position: 2, name: 'Helium', weight: 4.0026, symbol: 'He' },
  { position: 3, name: 'Lithium', weight: 6.941, symbol: 'Li' },
  { position: 4, name: 'Beryllium', weight: 9.0122, symbol: 'Be' },
  { position: 5, name: 'Boron', weight: 10.811, symbol: 'B' },
  { position: 6, name: 'Carbon', weight: 12.0107, symbol: 'C' },
  { position: 7, name: 'Nitrogen', weight: 14.0067, symbol: 'N' },
  { position: 8, name: 'Oxygen', weight: 15.9994, symbol: 'O' },
  { position: 9, name: 'Fluorine', weight: 18.9984, symbol: 'F' },
  { position: 10, name: 'Neon', weight: 20.1797, symbol: 'Ne' },
];

@Component({
  selector: 'app-mat-table',
  templateUrl: './mat-table.component.html',
  styleUrls: ['./mat-table.component.css'],
})
export class MatTableComponent {
  displayedColumns: string[] = ['position', 'name', 'weight', 'symbol'];
  dataSource = new MatTableDataSource<PeriodicElement>(ELEMENT_DATA);

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

  ngOnInit() {
    this.dataSource.paginator = this.paginator;
    this.dataSource.sort = this.sort;
  }
  applyFilter(filterValue: string) {
    this.dataSource.filter = filterValue.trim().toLowerCase();
  }
}

Answer 7

试试这个使用 mat-input、mat-icon 和多标题行的单内联过滤器 https://angular-material-table-multiple-header-rows-hyfefz.stackblitz.io/