Angular 2 Reactive form make both select dropdowns required if one has had one of its options selected -


i have 2 select dropdowns. both optional fields. need them both required if 1 of 2 has had 1 of options selected. i'm looking everywhere , know custom validator have no idea begin examples online don't come close need.

let assume if enter pin , confirmpin must (vice versa) else no need of required validations both.

code:

this.userform = this.fb.group({        ....        ....         security: this.fb.group({             pin: [this.securityobj.pin],             confirmpin: [this.securityobj.confimrpin]         }, {validator: abhimatcher})      });

customvalidator

export const customvalidator= (control: abstractcontrol): { [key: string]: boolean } => {     const initaltext = control.get('pin');     const requiredtext = control.get('confirmpin');      if (initaltext || requiredtext)         return null;      else         return { customvalidate: true };   }

html

       <form [formgroup]="userform"  novalidate  (ngsubmit)="onsubmit(userform)">            .....            .....             <input type="password" class="form-group" formcontrolname="pin">                             <div *ngif="userform.get('security').haserror('customvalidate') && userform.get('security').get('pin').touched" class="text-danger">                                 pin required!                             </div>                         </div><br />                         <div>                             <label class="center-block">confirmpin:</label>                             <input type="password" class="form-group" formcontrolname="confirmpin">                         </div>                         <div *ngif="userform.get('security').haserror('customvalidate') && userform.get('security').get('confirmpin').touched" class="text-danger">                             pin required!                         </div>       <button type="submit" class="btn btn-default" [disabled]="userform.invalid">submit</button>  </form>

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