Multiple executions can be triggered by ng-checked function

Question

Multiple executions can be triggered by ng-checked function

Here is the code snippet from the view :

 <input type="radio" name="tabset" id="tab2" aria-controls="rauchbier"
        ng-checked="switch_tabs()">

And in the controller, we have:

   $scope.switch_tabs = function(){
        console.log(notification_form_data);
        console.log($('#notification_form').serialize());
        if (notification_form_data != $('#notification_form').serialize() && notification_form_data!= undefined)
        { 
            var alertPopup = $ionicPopup.alert({
            title: 'vs',
            template: 'unsaved data in actions',
            button: 'Done'

        });

    }

The alert prompt and console.log are triggered 100 times when a certain condition is met. How can we make it trigger only once?

javascript angularjs

Answer 1

Answer №1

Understanding the behavior of ng-checked on page load

When using ng-checked, it is important to remember that it works with boolean values. For example, you can use ng-checked="checkbox_checked" where the checkbox will be checked if checkbox_checked is true.

If you want an action to occur only once when a radio box is clicked, consider using ng-click to trigger your function.

Alternatively, you can monitor changes in a variable by utilizing $scope.$watch.

$scope.$watch('notification_form_data', function() {
   if (notification_form_data != $('#notification_form').serialize() && notification_form_data != undefined) { 
      var alertPopup = $ionicPopup.alert({
      title: 'vs',
      template: 'unsaved data in actions',
      button: 'Done'
     });
})

Another approach is to incorporate an ng-model with ng-change, which will execute your function when the model is altered. To conditionally run the alert based on the state of the radio box, check if the variable associated with the ng-model is true.

<input type="radio" name="tabset" id="tab2" aria-controls="rauchbier"
        ng-model="radio_checked" 
        ng-changed="switch_tabs()">

$scope.radio_checked = false
$scope.switch_tabs = function(){
        console.log(notification_form_data);
        console.log($('#notification_form').serialize());
        if (notification_form_data != $('#notification_form').serialize() && notification_form_data!= undefined && $scope.radio_checked)
        { 
            var alertPopup = $ionicPopup.alert({
            title: 'vs',
            template: 'unsaved data in actions',
            button: 'Done'

        });

    }

Answer 2

Understanding the behavior of ng-checked on page load

When using ng-checked, it is important to remember that it works with boolean values. For example, you can use ng-checked="checkbox_checked" where the checkbox will be checked if checkbox_checked is true.

If you want an action to occur only once when a radio box is clicked, consider using ng-click to trigger your function.

Alternatively, you can monitor changes in a variable by utilizing $scope.$watch.

$scope.$watch('notification_form_data', function() {
   if (notification_form_data != $('#notification_form').serialize() && notification_form_data != undefined) { 
      var alertPopup = $ionicPopup.alert({
      title: 'vs',
      template: 'unsaved data in actions',
      button: 'Done'
     });
})

Another approach is to incorporate an ng-model with ng-change, which will execute your function when the model is altered. To conditionally run the alert based on the state of the radio box, check if the variable associated with the ng-model is true.

<input type="radio" name="tabset" id="tab2" aria-controls="rauchbier"
        ng-model="radio_checked" 
        ng-changed="switch_tabs()">

$scope.radio_checked = false
$scope.switch_tabs = function(){
        console.log(notification_form_data);
        console.log($('#notification_form').serialize());
        if (notification_form_data != $('#notification_form').serialize() && notification_form_data!= undefined && $scope.radio_checked)
        { 
            var alertPopup = $ionicPopup.alert({
            title: 'vs',
            template: 'unsaved data in actions',
            button: 'Done'

        });

    }

Multiple executions can be triggered by ng-checked function

Answer №1

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