AngularJS dynamic form field validation

Try my custom directive:

myApp.directive("dynamicName",function($compile){
  return {
      restrict:"A",
      terminal:true,
      priority:1000,
      link:function(scope,element,attrs){
          element.attr('name', scope.$eval(attrs.dynamicName));
          element.removeAttr("dynamic-name");
          $compile(element)(scope);
      }
   };
});

Use it:

<input dynamic-name="field.name"
       type="{{ field.type }}"
       placeholder="{{ field.name }}"
       ng-model="field.value"
       required>

DEMO

Explanation of the problem:

By default, input elements using ngModelController (ng-model) call FormController.$addControl when they are linked to register itself and expose a property on the FormController with the name property of the input which is {{ field.name }} in this case. Therefore, even though the control is registered but you don’t have exposed properties on FormController with named email, firstName, you only have {{ field.name }} referencing the last input item

Explanation of the solution:

In this solution, I created a custom directive to replace the {{ field.name }} with the correct name at runtime.

For more information why I have to use terminal:true, and priority:1000, check out this discussion: Add directives from directive in AngularJS