Tips for refining the ng-model value through AngularJS directive?

Question

Tips for refining the ng-model value through AngularJS directive?

When including the date element in a template, I'm encountering an issue with binding the ng-model value as a string to the date. To address this, I am attempting to convert the string into an object using the directive named date-ob.

<input type="date" ng-model="experience.date_start" date-ob>

In order to correctly handle this conversion, I have created a directive called date-ob. However, when implementing this directive, I am experiencing the following error:

Error: [ngModel:datefmt] Expected 2014-08-28 to be a date http://errors.angularjs.org/1.4.5/ngModel/datefmt?p0=2014-08-28

As a newcomer to utilizing directives, I would greatly appreciate some guidance on how to modify the code within the date-ob directive to resolve this issue. Could you provide me with a solution and explanation? Thank you.

angularjs angularjs-directive angularjs-scope angularjs-filter angularjs-ng-model

Answer 1

Answer №1

Check out this article on formatters and parsers - they are essential for tasks like this. Parsers alter how the value displayed in the view is stored in the model, while formatters adjust how the value stored in the model is shown in the view.

If you want to implement this functionality using a directive, you could try something similar to the following:

angular.module('myApp', [])
.directive('wrapperDirective', function(){
  return {
    link: function(scope) {
      scope.experience = {date_start: '2015-01-01'};
    }
  };
})
.directive('dateOb', function(){
  return {
    require: 'ngModel',
    link: function(scope, element, attrs, ngModel) {
      // view --> model (change date to string)
      ngModel.$parsers.push(function(viewValue){
        return viewValue.toISOString();
      });

      // model --> view (change string to date)
      ngModel.$formatters.push(function(modelValue){
        return new Date(modelValue);
      });
    }
  };
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.8/angular.js"></script>
<div ng-app="myApp" wrapper-directive>
    <p>Date is: {{experience.date_start}}</p>
    <input type="date" ng-model="experience.date_start" date-ob>  
</div>

Answer 2

Check out this article on formatters and parsers - they are essential for tasks like this. Parsers alter how the value displayed in the view is stored in the model, while formatters adjust how the value stored in the model is shown in the view.

If you want to implement this functionality using a directive, you could try something similar to the following:

angular.module('myApp', [])
.directive('wrapperDirective', function(){
  return {
    link: function(scope) {
      scope.experience = {date_start: '2015-01-01'};
    }
  };
})
.directive('dateOb', function(){
  return {
    require: 'ngModel',
    link: function(scope, element, attrs, ngModel) {
      // view --> model (change date to string)
      ngModel.$parsers.push(function(viewValue){
        return viewValue.toISOString();
      });

      // model --> view (change string to date)
      ngModel.$formatters.push(function(modelValue){
        return new Date(modelValue);
      });
    }
  };
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.8/angular.js"></script>
<div ng-app="myApp" wrapper-directive>
    <p>Date is: {{experience.date_start}}</p>
    <input type="date" ng-model="experience.date_start" date-ob>  
</div>

Answer 3

Answer №2

This solution worked for me, I highly recommend trying it out.

.directive('dateOb', function(){
 return {
    scope: {
     dateModel :'=ngModel'
    },
    link: function(scope, element, attrs, ctrl) {
        scope.$watch('dateModel',function(n,o){
            if(!n instanceOf Date)
            {
              scope.dateModel = new Date(dateModel);
            }
        });
    }       
}
});

Answer 4

This solution worked for me, I highly recommend trying it out.

.directive('dateOb', function(){
 return {
    scope: {
     dateModel :'=ngModel'
    },
    link: function(scope, element, attrs, ctrl) {
        scope.$watch('dateModel',function(n,o){
            if(!n instanceOf Date)
            {
              scope.dateModel = new Date(dateModel);
            }
        });
    }       
}
});

Tips for refining the ng-model value through AngularJS directive?

Answer №1

Answer №2

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