According to information found in the documentation.
Suppose you have a data object like {id: 123, name: 'Mr. Smith', favoriteColor: 'blue'}. It will be condensed to 123mr. smithblue. If your filter string was blue, it would count as a match because it is within the condensed string, and the corresponding row would show up in the table.
To change the default filtering behavior, you can define a custom filterPredicate function that takes a data object and a filter string, and returns true if the data object should be considered a match.
If you wish to filter only specific columns, you need to adjust the filterPredicate. There is already a solution provided here.
This example demonstrates how filtering works:
table-filtering-example.html
<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>
table-filtering-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'}, ];
You can utilize filterPredicate to filter a specific column as demonstrated below:
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;
}
I've revised the applyFilter() method and included ngOnInit(). Now, it filters only the name column and checks for an exact match (==).