The value of the checkbox model in AngularJS is not defined

I'm encountering an issue where I am trying to send the value of a checkbox from my model to the server. Since the checkbox has not been interacted with on the form, Angular does not assign it a value and returns undefined when I request the value.

Below is the code snippet for my markup:

<div class="form-group">
    <input id="templateDisable" type="checkbox" ng-model="template.disabled" />
    <label for="templateDisable">Disabled</label>
</div>

Additionally, here is a simplified version of the save action in my controller:

$scope.save = function (form) {
if (form.$valid) {
var formData = new FormData();
// This line of code is causing the issue
formData.append("disabled", $scope.template.disabled);
// ... some other stuff
}
};

Surprisingly, toggling the checkbox before clicking the save action results in the template.disabled property being false, without any manual intervention.

I have come across similar queries such as AngularJS: Initial checkbox value not in model. However, simple tasks like managing checkboxes should ideally be built into Angular, eliminating the need for writing directives for basic functionalities like this.

Answer №1

It is recommended to initialize default values for your model inside the controller or by using ng-init if desired.

app.controller('AppController',
    [
      '$scope',
      function($scope) {
        $scope.template = {
          disabled: false
        };
      }
    ]
  );
<div class="form-group">
  <input type="checkbox" ng-model="template.disabled" ng-init="template.disabled=false" />
  <label>Disabled</label>
</div>

Answer №2

When the page is loaded or refreshed, the code below will always reset the state to "unchecked", effectively erasing any user selections.

<input type="checkbox" ng-model="template.disabled" 
 ng-init="template.disabled=false" />

If you want the checkbox to have a default state upon loading but also remember user interactions, then use the following code instead.

<input type="checkbox" ng-model="template.disabled" 
 ng-init="template.disabled = template.disabled || false" />

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