jquery - Unobtrusive validation - added rule only works when an existing field is in place -


i trying add required rule dynamically radio button list.

the example below works though when 'name' row removed validation longer fires.

it appears there needs field data-val attributes on page validation plugin start watching form.

how can add dynamic rules page no existing unobstrusive fields?

<!doctype html> <html> <head>     <title></title>     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css"> </head> <body>  <div class="container body-content">     <form action="" method="post">          <!-- when below row commented out validation no longer fires -->         <div class="row">             <div class="col-md-4">                 <p>name</p>             </div>             <div class="col-md-4">                 <input class="input-validation-error" data-val="true" data-val-required="name required" id="name" name="name" type="text" value=""/>             </div>             <div class="col-md-4">                 <span class="field-validation-error" data-valmsg-for="name" data-valmsg-replace="true"></span>             </div>         </div>          <div class="row dynamic_checkbox_container">             <div class="col-md-4">                 <p>dynamic checkbox</p>             </div>             <div class="col-md-2">                 yes                 <input id="checkbox" name="checkbox" type="radio" value="true"/>             </div>             <div class="col-md-2">                 no                 <input id="checkbox" name="checkbox" type="radio" value="false"/>             </div>             <div class="col-md-4">                 <span class="field-validation-valid" data-valmsg-for="checkbox" data-valmsg-replace="true"></span>             </div>         </div>           <input type="submit" value="go" name="go"/>     </form> </div>      <script src="https://code.jquery.com/jquery-1.11.3.js"></script>     <script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.13.1/jquery.validate.js"></script>     <script src="http://ajax.aspnetcdn.com/ajax/mvc/5.2/jquery.validate.unobtrusive.js"></script> <script>      $(document).ready(function() {           $(".dynamic_checkbox_container input").each(function() {              $(this).rules("add", {                 required: true,                 messages: {                     required: "this field required."                 }             });         });     });  </script> </body> </html>


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