When using AngularJS, encountered an issue where a view was not updating with new data from a $http request

When making a request to the 500px API using $http for popular photos, the response object is successfully returned. However, I am facing difficulty in pushing the retrieved photo items to the view.

Below is my current controller code:

meanApp.controller 'SearchController', ['$scope', '$http', 'Global', ($scope, $http, Global) ->

  $scope.global = Global
  $scope.photos = []

  $scope.submit = ->
    if $scope.text

      $http.get("https://api.500px.com/v1/photos?feature=popular").success (data) ->
        $scope.photos.push data

]

The JSON response object looks like this (excerpted for conciseness):

{
  "current_page":1,
  "total_pages":1449,
  "total_items":7244,
  "photos":[
    {
      "id":58494612,
      "user_id":1795149,
      "name":"Van Gogh!!!!"
    },
    {
      "id":49566952,
      "user_id":1795149,
      "name":"Autumn touch!"
    },
    {
      "id":49527034,
      "user_id":2670757,
      "name":"Untitled"
    },
    {
      "id":39374598,
      "user_id":3669660,
      "name":"The Wild Cannot Be Tamed Nor The Rednecks in it! "
    },
    {
      "id":28303657,
      "user_id":2843749,
      "name":"Main road to go to the moon"
    }
  ]
}

This is the structure of my view:

<h1>Photo search</h1>

<form ng-submit="submit()" ng-controller="SearchController">
Enter text and hit enter:
  <input type="text" ng-model="text" name="text">
  <input type="submit" id="submit" value="Submit">
</form>

<ul>
  <li ng-repeat="photo in photos.photos">{{photo.name}}</li>
  <li ng-hide="photos.length">No photos</li>
</ul>

Currently, the list within the <ul> tag does not update as expected. I have considered using $apply, but that did not solve the issue either.

Answer №1

Issue Update

The reason for the problem is that your ng-repeat is placed outside the scope of SearchController

<form ng-submit="submit()" ng-controller="SearchController">
Enter text and hit enter:
  <input type="text" ng-model="text" name="text">
  <input type="submit" id="submit" value="Submit">
</form> <!-- end SearchController -->

<ul>
  <!-- Outside of SearchController's scope -->
  <li ng-repeat="photo in photos.photos">{{photo.name}}</li> 
  <li ng-hide="photos.length">No photos</li>
</ul>

Hence, it does not have access to the value of photos.photos.

To resolve this issue, you should encapsulate your entire "Photo search" section, consisting of both the search function and the results, under one controller's scope.

View Demo

You may also need to refer back to my initial response ...

Initial Response

After reviewing the result of your request and storing it in $scope.photos as an array, the data structure might appear as follows:

[{ current_page: ..., photos: [...], total_items: ..., totalpages: ...}]

If this is the case, you should access it using an expression like:

<li ng-repeat="photo in photos[0].photos">

However, if your intention is to assign the data to $scope.photos as shown below:

$scope.photos = data

In this scenario, your existing expression should work correctly.

Answer №2

Before proceeding, ensure that your reply can be utilized as a JavaScript object. Take the following steps:

console.log(data);
console.log($scope.photos);

within the success function of your $http.get request. Verify if data is a JavaScript object or an array of objects (check the browser's JS Console). If it appears as a string, utilize

JSON.parse(response);

to parse the response before adding it to the array. It is essential to confirm that what you are adding to the $scope.photos array is a photo object. The console.log($scope.photos) should display an array of objects. Finally, after adding data, remember to execute

$scope.apply();

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