JAVASCRIPT

ngx-search clearing

<mat-select #matRef [formControl]="cMultiCtrl" [multiple]="true" required (selectionChange)="selectionChange($event)">
          <mat-option>
          <ngx-mat-select-search placeholderLabel="Search" noEntriesFoundLabel="No Matching Value Found" [formControl]="cMultiFilterCtrl"></ngx-mat-select-search>
        </mat-option>
          <mat-option *ngFor="let val of filteredCMulti | async" [value]="val.value">
            {{val.name}}
          </mat-option>
        </mat-select>

ngx-search clearing-imp

@ViewChild('matRef') matRef: MatSelect;

clear() {
  this.matRef.options.forEach((data: MatOption) => data.deselect());
}