Issue
In an Angular 17 application, is there a way to use signal-based data as a datasource for a material table (mat-table)?
I tried passing it as I would with an array data source
<table mat-table [dataSource]="store.users()">
Solution
If you want an example of using signals for rendering a mat table here you go, we can use .set()
to update the value and angular/material will pickup the changes and update the view!
ts
import { Component, WritableSignal, signal } from '@angular/core';
import { MatTableModule } from '@angular/material/table';
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' },
];
/**
* @title Basic use of `<table mat-table>`
*/
@Component({
selector: 'table-basic-example',
styleUrls: ['table-basic-example.css'],
templateUrl: 'table-basic-example.html',
standalone: true,
imports: [MatTableModule],
})
export class TableBasicExample {
displayedColumns: string[] = ['position', 'name', 'weight', 'symbol'];
dataSource: WritableSignal<PeriodicElement[]> = signal([]);
ngOnInit() {
this.dataSource.set(ELEMENT_DATA);
}
ngAfterViewInit() {
setInterval(() => {
const data = ELEMENT_DATA.map((x) => {
x.weight = Math.random();
return x;
});
this.dataSource.set(data);
}, 1000);
}
}
html
<table mat-table [dataSource]="dataSource()" class="mat-elevation-z8">
<!--- Note that these columns can be defined in any order.
The actual rendered columns are set as a property on the row definition" -->
<!-- Position Column -->
<ng-container matColumnDef="position">
<th mat-header-cell *matHeaderCellDef>No.</th>
<td mat-cell *matCellDef="let element">{{element.position}}</td>
</ng-container>
<!-- Name Column -->
<ng-container matColumnDef="name">
<th mat-header-cell *matHeaderCellDef>Name</th>
<td mat-cell *matCellDef="let element">{{element.name}}</td>
</ng-container>
<!-- Weight Column -->
<ng-container matColumnDef="weight">
<th mat-header-cell *matHeaderCellDef>Weight</th>
<td mat-cell *matCellDef="let element">{{element.weight}}</td>
</ng-container>
<!-- Symbol Column -->
<ng-container matColumnDef="symbol">
<th mat-header-cell *matHeaderCellDef>Symbol</th>
<td mat-cell *matCellDef="let element">{{element.symbol}}</td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>
Answered By - Naren Murali
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