AngularJS doesn't fetch JSON data

Question

AngularJS doesn't fetch JSON data

I am attempting to retrieve data from a JSON file using AngularJS and the $http.get method. I am following the new way of writing AngularJS scripts, as outlined in this helpful link.

PLUNKER

However, when I try to execute my code, nothing appears to be happening and Firebug is not providing any useful information.

I suspect that the issue lies within my activate() function, particularly with regards to my understanding of promises.

function activate() {
    return $http.get('test.json').then(function(data) {
        vm.result = data;
        return vm.result;
    });
}

Do you have any insights or suggestions on how to resolve this issue?

javascript json angularjs

Answer 1

Answer №1

Upon reviewing the provided information, a couple of issues have been identified.

Initially, in the plunker code snippet, there is an overlooked detail:

controller.$inject = ["$http"];

function controller() {

The omission of the $http parameter in the controller function's signature has been noted.

function controller($http) {

Furthermore, upon correction, it was observed that the index.html file was binding to {{c.value}}, but no such property was defined in the controller. Perhaps it should be {{c.result}}? By making these adjustments, a visible outcome can be achieved.

Answer 2

Upon reviewing the provided information, a couple of issues have been identified.

Initially, in the plunker code snippet, there is an overlooked detail:

controller.$inject = ["$http"];

function controller() {

The omission of the $http parameter in the controller function's signature has been noted.

function controller($http) {

Furthermore, upon correction, it was observed that the index.html file was binding to {{c.value}}, but no such property was defined in the controller. Perhaps it should be {{c.result}}? By making these adjustments, a visible outcome can be achieved.

Answer 3

Answer №2

At this particular moment in your code, you are unable to use the return statement within your then callback function. Instead, you should return the `$http` call itself, which will be a promise that needs to be resolved. Additionally, if you see an error message in your console saying something like `$http is undefined`, it indicates that the service was not injected properly. Take a look at the example below...

function activate() {
    return $http.get('test.json')
}

[...]

activate().then(function(response) {
    vm.result = response.data;
});

Plunker - see demo

On another note, it would be beneficial to encapsulate the logic of the `activate()` function into a reusable service to avoid cluttering your controllers. Therefore, instead of directly injecting `$http`, inject the custom service into the controller.

Plunker - demo showcasing logic wrapped in a simple service

Answer 4

At this particular moment in your code, you are unable to use the return statement within your then callback function. Instead, you should return the `$http` call itself, which will be a promise that needs to be resolved. Additionally, if you see an error message in your console saying something like `$http is undefined`, it indicates that the service was not injected properly. Take a look at the example below...

function activate() {
    return $http.get('test.json')
}

[...]

activate().then(function(response) {
    vm.result = response.data;
});

Plunker - see demo

On another note, it would be beneficial to encapsulate the logic of the `activate()` function into a reusable service to avoid cluttering your controllers. Therefore, instead of directly injecting `$http`, inject the custom service into the controller.

Plunker - demo showcasing logic wrapped in a simple service

AngularJS doesn't fetch JSON data

Answer №1

Answer №2

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