Linked checkboxes to "download selected" button

src/app/core/directives/checkbox.directive.ts

@@ -0,0 +1,19 @@
+import { Directive, ElementRef, Output, EventEmitter } from '@angular/core'
+
+@Directive({
+  selector: '[appCheckbox]'
+})
+export class CheckboxDirective {
+  @Output() checked = new EventEmitter<boolean>()
+
+  private _checked = false
+
+  constructor(element: ElementRef) {
+    $(element.nativeElement).checkbox({
+      onChange: () => {
+        this._checked = !this._checked
+        this.checked.emit(this._checked)
+      }
+    })
+  }
+}