AngularJS is failing to render elements stored within an array retrieved from MongoDB

My AngularJS application is not displaying the "tracking" entry from the data structure as expected. It appears as an empty array both in the HTML template and when logged to the console.

The API returns the following data:

[{
"_id": "57e96aaa45b09843a53a4dcd",
"phase": 1,
"notes": "asdf",
"treatment": "asdf",
"patientname": "asdf",
"__v": 0,
"tracking": [
    {
    "modifiedby": "Person",
    "action": "Created",
    "_id": "57e96aaa45b09843a53a4dce",
    "modifiedat": "2016-09-26T18:36:26.281Z"
    }
]
}]

In my AngularJS factory, I have the following function:

getwaiting: function(callback){
        $http.get('/pre-auth/getwaitingsubmit').then(function success(data){
            return callback(data.data)
        })
    }

And in my controller:

WaitingFactory.getwaiting(function(data){
        console.log(data);
        $scope.waitinglist = data;
    });

When I try to display {{waitinglist}} in my HTML template, it shows all the data except for the "tracking" field, which appears as an empty array. I cannot access the data within "tracking". However, when I stringify the data and log it to the console, I can see that the data is indeed present in the "tracking" field.

What could be causing this issue?

Answer №1

Consider using promises instead of callbacks in your factory function:

getWaitList: function() {
        return $http.get('/pre-auth/getwaitinglist').then(function(response) {
            return response.data;
        })
    }

In your controller:

WaitingFactory.getWaitList().then(function(data) {
        console.log(data.tracking);
        $scope.waitingList = data;
    });

Note: When logging the data object in the console, it may display the latest value at the time of logging due to asynchronous behavior. To troubleshoot, try logging data.tracking which should show undefined if there is an issue with asynchronicity. Refer to this article for more information: Weird behavior with objects & console.log

Answer №2

Following Oberon's advice, I attempted the suggested solution and found that the data appeared in the same manner as before.

Upon reading t3__rry's suggestion to simply "loop through it," I implemented an ng-repeat and discovered that the data was indeed present; I just needed to iterate over it. It seems that angularJS was reluctant to display the objects in the printout.

Interestingly, the chrome console continued to display tracking as Array[0].

I appreciate everyone's prompt responses!

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