Leveraging the $dirty property in AngularJS to determine if any changes have been made to a form

Recently, I've been attempting to determine if my form is being edited by monitoring certain fields. I've come across $dirty as a potential solution for this task, but unfortunately, I'm struggling to identify what exactly I'm overlooking here:

<!DOCTYPE html>
<html lang="en">
<script src= "http://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script>
<body>

<div ng-app="myApp" ng-controller="formCtrl">
  <form name = "myForm" novalidate>
    First Name:<br>
    <input type="text" ng-model="user.firstName"><br>
    Last Name:<br>
    <input type="text" ng-model="user.lastName">
    <br><br>
    <button ng-click="reset()">RESET</button>
  </form>
  <p> is Form dirty? {{isDirty}}<p>
  <p>form = {{user }}</p>
  <p>master = {{master}}</p>
</div>

<script>
var app = angular.module('myApp', []);
app.controller('formCtrl', function($scope) {
    $scope.master = {firstName:"John", lastName:"Doe"};
    $scope.reset = function() {
        $scope.user = angular.copy($scope.master);
    };
    $scope.reset();
    $scope.isDirty = $scope.myForm.$dirty;
});
</script>

</body>
</html>

My goal is to set the flag isDirty to true whenever there is a modification made to the form by the user. Your help on this matter would be greatly appreciated. Thank you!

Answer №1

To enable form validation, ensure that each form field has a unique name attribute assigned to it in your form. This will allow the fields to be added to the myForm object.

Markup

  <form name="myForm" novalidate>
    First Name:<br>
    <input type="text" name="firstName" ng-model="user.firstName"><br>
    Last Name:<br>
    <input type="text" name="lastName" ng-model="user.lastName">
    <br><br>
    <button ng-click="reset()">RESET</button>
  </form>

Keep in mind that when accessing the myForm object in your controller, it may be undefined until the DOM is fully rendered. To access $scope.myForm from the controller, utilize the $timeout function to ensure it is available in the next digest cycle.

  $timeout(function(){
    $scope.isDirty = $scope.myForm.$dirty;
  });

Update

Avoid maintaining a separate isDirty flag; instead, directly use $scope.myForm.$dirty as a flag to track changes in the form's dirty status. Simply reference myForm.$dirty, and this flag will update dynamically as the form becomes dirty.

View Working Plunkr Example

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