Angular Material Table Sorting with reactive formarray

Question

I am trying to implement sorting / filtering on angular material table with formArray as input data source.

StackBlits code link

dataSource = new MatTableDataSource([]);
<table mat-table [dataSource]="formdataarray.controls" multiTemplateDataRows class="mat elevation-z8" matSort >
<ng-container  matColumnDef="{{column}}" *ngFor="let column of columnsToDisplay" >
<th mat-header-cell *matHeaderCellDef mat-sort-header>{{column}}</th>
<td mat-cell *matCellDef="let element"> {{ element.value[column] }}  </td>
</ng-container>

But Sorting / Filtering is not working

Answer 1

You have two options here:

• use plain array formdataarray.controls as a dataSource and implement all DataSource methods like filter, sort by your own. Or write custom CDK DataSource implementation. See also https://blog.angular-university.io/angular-material-data-table/

• use MatTableDataSource and adjust filtering and sorting logic to support AbstractControl object.

html

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

ts

ngOnInit() {
  // fill FormArray
  ...
  this.dataSource.data = this.formdataarray.controls;
  this.dataSource.sortingDataAccessor = (data: AbstractControl, sortHeaderId: string) => {
    const value: any = data.value[sortHeaderId];
    return typeof value === 'string' ? value.toLowerCase() : value;
  };

  const filterPredicate = this.dataSource.filterPredicate;
  this.dataSource.filterPredicate = (data: AbstractControl, filter) => {
    return filterPredicate.call(this.dataSource, data.value, filter);
  }
}

Forked Stackblitz

Also, if you want to add new items to your FormArray you should update this.dataSource.data as well. See also Angular Material editable table using FormArray