Angular Material Table Dynamic Columns without model
I've tried my best to boil a dynamic table down to the minimum. This example will display any columns given an array of flat objects with any keys. Note how the first object has an extra "foo" property that causes an entire column to be created. The DATA const could be some data you get from a service. Also, you could add a "column ID -> label" mapping into this if you know some common property names you'll be getting the JSON. See the stachblitz here.
import {Component, ViewChild, OnInit} from '@angular/core';
const DATA: any[] = [
{position: 1, name: 'sdd', weight: 1.0079, symbol: 'H', foo: 'bar'},
{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'}
];
@Component({
selector: 'dynamic-table-example',
styleUrls: ['dynamic-table-example.css'],
templateUrl: 'dynamic-table-example.html',
})
export class DynamicTableExample implements OnInit {
columns:Array<any>
displayedColumns:Array<any>
dataSource:any
ngOnInit() {
// Get list of columns by gathering unique keys of objects found in DATA.
const columns = DATA
.reduce((columns, row) => {
return [...columns, ...Object.keys(row)]
}, [])
.reduce((columns, column) => {
return columns.includes(column)
? columns
: [...columns, column]
}, [])
// Describe the columns for <mat-table>.
this.columns = columns.map(column => {
return {
columnDef: column,
header: column,
cell: (element: any) => `${element[column] ? element[column] : ``}`
}
})
this.displayedColumns = this.columns.map(c => c.columnDef);
// Set the dataSource for <mat-table>.
this.dataSource = DATA
}
}<mat-table #table [dataSource]="dataSource">
<ng-container *ngFor="let column of columns" [cdkColumnDef]="column.columnDef">
<mat-header-cell *cdkHeaderCellDef>{{ column.header }}</mat-header-cell>
<mat-cell *cdkCellDef="let row">{{ column.cell(row) }}</mat-cell>
</ng-container>
<mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
<mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>
</mat-table>I found solution :) It is very very easy but i could't see at first :) only like that :
<mat-cell *matCellDef="let element "> {{element[disCol]}} </mat-cell>
I must use {{element[disCol]}} only in HTML.
Now , everything is ok:)
For a full working example based on @mevaka's
Where jobDetails$ is the array of items.
columns$ is equvilent to Object.keys(jobDetails$[0]) so is just a string[]
<table mat-table [dataSource]="jobDetails$ | async">
<ng-container *ngFor="let disCol of (columns$ | async); let colIndex = index" matColumnDef="{{disCol}}">
<th mat-header-cell *matHeaderCellDef>{{disCol}}</th>
<td mat-cell *matCellDef="let element">{{element[disCol]}}</td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="(columns$ | async)"></tr>
<tr mat-row *matRowDef="let row; columns: (columns$ | async)"></tr>
</table>