calendar - adding a required rule to devextreme scheduler - Angular -


i'am using angular , devextreme scheduler's plugin make google calendar app. when create appointment, i've made custom form. subject / date / , select box select person. force required rules subject using function :

calendar.component.ts:

  onappointmentformcreated(data: any) {     console.log(data)       let form = data.form;       form.itemoption("text","isrequired",true);   }

i tryed force required method selectbox using method described. on devextreme scheduler's documentation found nothing useful. tryed use dx form validator method doing : calendar.component.html

<dx-scheduler     [showalldaypanel]="false"     [datasource]="appointmentsdata"     appointmenttemplate="appointmenttemplate"     [views]='["agenda","workweek"]'     startdateexpr="startdate"     enddateexpr="enddate"     currentview="workweek"     textexpr="text"     [firstdayofweek]="1"     [startdayhour]="9"     [enddayhour]="18"     width="100%"     [height]="1100"     (onappointmentformcreated)="onappointmentformcreated($event)"     (onappointmentadding)="creatingappointment($event)"     (onappointmentadded)="createappointment($event)"     (onappointmentupdated)= "updatingappointment($event)"     (onappointmentdeleted)= "deletingappointment($event)">      <dx-date-box [value] = "date" >       <dxo-display-format  type="shortdatefr"></dxo-display-format>     </dx-date-box>      <div *dxtemplate="let appointment of 'appointmenttemplate'">     <i>{{appointment.text}} -- </i>     <b>{{appointment.ownername}}</b>     </div>      <dxi-resource         fieldexpr="ownerid"         label="personne"         [datasource]="persondata">         <dx-validator>             <dxi-validation-rule type="required" message="person required"></dxi-validation-rule>         </dx-validator>      </dxi-resource>  </dx-scheduler>

adding calendar module: 

import ....         dxvalidatormodule,dxvalidationsummarymodule

like saw here : https://js.devexpress.com/demos/widgetsgallery/demo/validation/overview/angular/light/ ( country )

i add required validator function selectbox don't know how... need please. much

i quess method should work. make sure specified correct fieldname:

form.itemoption('ownerid', 'isrequired', true);

plunker example


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