How to set by default selected values in PrimeNg MultiSelect with Angular 4 Reactive Form?

Question

I am using MultiSelect control from PrimeNg (PrimeNg Multiselect) & Angular4 with a Reactive Form, and I want to keep some my items default selected during form loading.

HTML

<div class="col-md-4">
      <span translate>settings.account.webhook.label.additional.variables</span>
      <p-multiSelect [options]="sensorsList" (onChange)="changeSensorsList($event)"
            formControlName="selectedSensorsList" name="selectedSensorsList" [panelStyle]="{minWidth:'20em'}"></p-multiSelect>
</div>

Here is my TypeScript code

sensorsList = [
    { label: 'lat', value: {'id': 0, 'itemName': 'lat', 'selected': false }},
    { label: 'lng', value: {'id': 1, 'itemName': 'lng' , 'selected': false}},
    { label: 'address', value: {'id': 2, 'itemName': 'address' , 'selected': false}},
    { label: 'origin', value: {'id': 3, 'itemName': 'origin' , 'selected': false}}
  ];

 this.addEditWebhookForm = this._formBuilder.group({
      name: [(_webhookToEdit) ? _webhookToEdit['name'] : '', [Validators.required]],
      selectedSensorsList: []
 });

Answer 1

HTML

You need to set a ngModel in your primeng component

<div class="col-md-4">
          <span translate>settings.account.webhook.label.additional.variables</span>
          <p-multiSelect [options]="sensorsList" (onChange)="changeSensorsList($event)"
                formControlName="selectedSensorsList" name="selectedSensorsList" [panelStyle]="{minWidth:'20em'}"  [(ngModel)]="selectedDefault"></p-multiSelect>
    </div>

TS

selectedDefault= [];
sensorsList.map((item) => selectedDefault.push(item.value));

Right here I'm selecting all of them.

You will also have to udpate the sensorlist object to changed the value selected to true