typescript - angular2 ngForm validation for dynamic generated elements -


i have list of form elements generated base on api json. trying add validation them , i'm using angular2 ngform. textboxes, dropdown(select) validation working perfect "on keypress" or "on select" error message removed radio button , checkbox validation not working in error message remove after whole form valid.

my radio button element json like: 

{  "id": 8,  "question": "marital status",  "description": "",  "answer_element": "radio",  "is_required": true,   "answers": [     {       "id": 41,       "answer": "married",       "is_image": false,       "image_url": "/assets/images/original/noimage.png"     },     {       "id": 42,       "answer": "divorced",       "is_image": false,       "image_url": "/assets/images/original/noimage.png"     },     {       "id": 43,       "answer": "single",       "is_image": false,       "image_url": "/assets/images/original/noimage.png"     }   ],   "questionaries": [] }

and checkbox button element json like: 

{   "id": 33,   "question": "would wear these colors?",   "description": "",   "answer_element": "checkboxes",   "is_required": true,   "answers": [     {       "id": 178,       "answer": "red",       "is_image": true,       "image_url": "/178/original/red.png?1501830794"     },     {       "id": 179,       "answer": "yellow",       "is_image": true,       "image_url": "/179/original/tan.png?1501830794"     },     {       "id": 176,       "answer": "black",       "is_image": true,       "image_url": "/176/original/black_color.png?1501830212"     },     {       "id": 177,       "answer": "brown",       "is_image": true,       "image_url": "/177/original/brown.png?1501830213"     },     {       "id": 181,       "answer": "grey",       "is_image": true,       "image_url": "/181/original/grey.png?1501830794"     },     {       "id": 182,       "answer": "salmon",       "is_image": true,       "image_url": "/182/original/salmon.png?1501830794"     },     {       "id": 183,       "answer": "tan",       "is_image": true,       "image_url": "/183/original/yellow.png?1501830794"     },     {       "id": 184,       "answer": "white",       "is_image": true,       "image_url": "/184/original/white.png?1501830794"     },     {       "id": 185,       "answer": "pale blue",       "is_image": true,       "image_url": "/185/original/paleblue.png?1501830794"     },     {       "id": 186,       "answer": "navy blue",       "is_image": true,       "image_url": "/186/original/navybule.png?1501830794"     }   ],   "questionaries": [] }

my angular2 ngform code radio button following:

<div *ngif="question.answer_element === 'radio'">   <div class="form-group">     <label>{{question.question}}</label>     <div class="radio">       <label *ngfor="let answer of question.answers;">         <input type="radio" name="f{{i}}" [(ngmodel)]="question.questionaries.length > 0 ? question.questionaries[0].answers[0] : question.answers[0][0]" required #f="ngmodel" value="{{answer.id}}" (change)="changeanswer(question.id,[answer.id],true)" ><span class="icn"></span>         {{answer.answer}}       </label>     </div>     <small *ngif="questionform.submitted && !questionform.valid" class="text-danger">       field required     </small>   </div> </div>

my angular2 ngform code checkbox code following:

<div *ngif="question.answer_element === 'checkboxes' && question.answers[0].is_image === true">   <div class="form-group">     <label>{{question.question}}</label>     <div class="checkbox brand">       <div class="brand-block" *ngfor="let answer of question.answers; let j = index;">         <label>           <input type="checkbox" name="question[{{question.id}}]" id="question_{{answer.id}}"  required  [checked]="question.questionaries.length > 0 ? question.questionaries[0].answers.includes(answer.id.tostring()) : false" value="{{answer.id}}" (change)="changecheckboxanswer(question.id,answer.id,$event.target.checked)" ><span class="icn"></span>           <div class="brand-img"><img src="{{answer.image_url}}" alt="{{answer.answer}}" /></div>           <p class="brand-name">{{answer.answer}}</p>         </label>       </div>     </div>     <small *ngif="questionform.submitted && !questionform.valid" class="text-danger">       field required     </small>   </div> </div>


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