Is the Scope Staying Static in AngularJS 1.4 when Input Text Changes and Two-Way Binding is Enabled?

Encountering a strange issue with AngularJS 1.4 (TypeScript). The problem lies within the controller where a variable is set and displayed in an input text box. Oddly, when attempting to edit the value in this text box and clicking on a button, the variable's value remains unchanged(!).

HTML view

<div class="form-group">   
     <label>Title</label>
     <input class="form-control" ng-model="serviceTitle">
</div>


<div class="form-group">
     <button class="btn btn-primary" ng-click="updateServiceIdentification()">Update Service Identification</button>
</div>

Controller:

 $scope.serviceTitle = "Test";

 $scope.updateServiceIdentification = ()=> {
    // despite changes in view, variable retains initial value of "Test"????
    alert($scope.serviceTitle);
 }

If a test label is added in HTML view

<h1>{{serviceTitle}}</h1>

value modification in input text box successfully updates this label.

Answer №1

This issue has consumed a significant amount of my time. Interestingly, placing a text box beneath a certain element causes it to malfunction. However, moving the text box outside of the element results in the alert() correctly displaying the updated value from the text box.

    <input class="form-control" ng-model="serviceTitle">
    <input type="button" class="btn btn-primary" ng-click="updateServiceIdentification()" value="Update Service Identifcation"/>
    <accordion>
            <accordion-group>
              <accordion-heading>
                        additional content goes here, positioned to the left side of the header.

                        <div class="pull-right">
                          <span>1st info</span>
                          <span>2nd info</span>
                          <span>maybe 3rd?</span>
                        </div>                
              </accordion-heading>
             <!------------ Doesn't work if it is inside ------------->
            </accordion-group>    
          </accordion>

The root cause of this problem lies in the nature of strings as primitives. Angular updates values by changing the pointer to the new value, resulting in the controller referencing the old value due to the outdated pointer." Damax - Ng-model does not update controller value

To address this issue in the controller:

$scope.output = {serviceTitle: "1234567"};                
$scope.serviceTitle = "asdadasdsad";

$scope.updateServiceIdentification = (...args: any[])=> {
     alert($scope.output.serviceTitle);
}

By implementing these changes, the functionality can be restored even within accordion elements in the view.

   <uib-accordion close-others="false">
       <uib-accordion-group is-open="isAvailableLayersOpen">
           <input class="form-control" ng-model="output.serviceTitle">
           <input type="button" class="btn btn-primary" ng-click="updateServiceIdentification()" value="Update Service Identifcation"/>
       </uib-accordion-group>
  </uib-accordion>

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