Losing Selected Value in AngularJS Dropdown After REST API Call and Updating Scope Variable

My development setup includes an AngularJS front end paired with an ASP.net Web API backend. Currently, I have a select list implementation utilizing the code snippet below:

<select id="package" class="form-control" ng-options="package as package.Name for package in request.PackageServices.Packages" ng-model="request.Package">
    <option value="">No Package</option>
</select>

The select list successfully populates with the expected packages.

Upon changing the selection, the request.Package item appropriately updates with the chosen package.

When sending the request object to the Web API restful service, it accurately includes the correct package.

After the web API responds to the client with the restful response, the request object retains the precise package information.

The issue arises when the API service call is made, and the response from the service causes the select list to lose the selected value.

Below is a snippet of the saveRequest method:

$scope.saveRequest = function (request) {

        console.log(request);

        // At this point, the request.Package object accurately represents the selected package    

        applicantLinkData.create(request)
        .$promise.then(
            function (resp) {
                $scope.request = resp.Request;
                console.log(resp.Request);
                // The resp.Request.Package maintains the correct package value
            },
            function (resp) {
                // Handle failure case
            }
        );
   };

I am struggling to find a solution to this issue. After invoking the saveRequest method, the select list in the HTML reverts to displaying "No Package" instead of preserving the chosen package.

Answer №1

You are faced with a decision between two paths:

  • Opt against replacing the entire request, which would lead angular to lose sight of the object connection. You must manually transfer each field.
  • Give your package an identifier and implement tracking by Id in your ng-options instead of tracking by object reference.
    ng-options="package as package.Name for package in request.PackageServices.Packages track by package.Id"

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