AngularJS multiple forms with ng-repeat validation

问题

I am using ng-form as a parent form and child mg-forms for validation with ng-repeat.

<div ng-form="form">
    <div ng-repeat="field in fields">
        <div ng-form="subform"><input...></div>
    </div>
</div>

And validating like this:

if ($scope.form.subform.$invalid && !$scope.form.subform.$error.required) {
    // Do something...
}

(this is very simplified example, I have more different subforms for different input types and with different names, e.g. input[text] is named as a TextForm, input[numeric] is NumericForm etc.)

Everything works as expected if there is only on field. But if ng-repeat generates multiple fields, validation triggers only the last subform, others gets ignored.

Is there a way of cycling through all subforms to check if one of them is invalid?

Also, I am marking all unfilled required fields like this:

if ($scope.form.$error.required) {
     angular.forEach($scope.form.$error.required,
         function (object, index) {
             $scope.form.$error.required[index].$setDirty();
         }
     );
}

So if my fields are done like this:

....ng-form="TextForm" ng-class="{ 'has-error': TextForm.$dirty && TextForm.$invalid }"....

And it marks all the subforms even if there are many of the same ones with the same name.

Maybe I could do something similar with invalid fields? Though tried many things, nothing worked...

回答1:

A solution for this is to create a directive that assigns the ngModelController's error to a variable in each ng-repeat input.

Below is a possible implementation to get the errors of each subForm. DEMO

JAVASCRIPT (directive)

  .directive('ngModelError', function($parse, $timeout) {
    return {
      require: ['ngModel', 'form'],
      link: function(scope, elem, attr, ctrls) {
        var ngModel = ctrls[0],
            ngForm = ctrls[1],
            fieldGet = $parse(attr.ngModelError),
            fieldSet = fieldGet.assign,
            field = fieldGet(scope);

        $timeout(function() {
          field.$error = ngModel.$error;
          field.ngForm = ngForm;
          fieldSet(scope, field);
        });

      }
    };
  });

HTML

<form name="form" ng-submit="submit(form, fields)" novalidate>
  <div ng-form="subForm" ng-repeat="field in fields"
    ng-class="{'has-error': subForm.$invalid && form.$dirty}">
    <label class="control-label">{{field.label}}</label>
    <input type="{{field.type}}" placeholder="{{field.placeholder}}" 
      ng-model="field.model" name="field" 
      ng-required="field.isRequired" class="form-control" 
      ng-model-error="field" />
  </div>
  <br>
  <button type="submit" class="btn btn-primary">Submit</button>
</form>

JAVASCRIPT (controller)

Please take note how the fields are structure:

  .controller('Ctrl', function($scope) {
    $scope.fields = {
      email: {
        type: 'email',
        placeholder: 'Enter email',
        isRequired: true,
        label: 'Email Address'
      }, 

      password: {
        type: 'password',
        placeholder: 'Enter password',
        isRequired: true,
        label: 'Password'
      }
    };

    $scope.submit = function(form, fields) {
      form.$dirty = true;

      if(form.$valid) {
        // do whatever
      } else {
        // accessing ngForm for email field
        console.log(fields.email.ngForm);
        // accessing errors for email field
        console.log(fields.email.$error);

        // accessing ngForm for password field
        console.log(fields.password.ngForm);
        // accessing errors for password field
        console.log(fields.password.$error);
      }
    };
  })

来源：https://stackoverflow.com/questions/25180698/angularjs-multiple-forms-with-ng-repeat-validation