The function fails to provide the $http response

Question

The function fails to provide the $http response

I've developed a function expression that I've linked to scope. The purpose of this function is to trigger an $http request, retrieve a specific property, and then deliver it.

$scope.getRequestDigest = function () {
    var url = urlParams['SPAppWebUrl'] + '/_api/contextinfo';
    $http.post(url)
    .success(function (res) {
        return res;
    });
}

However, when I invoke $scope.getRequestDigest(), it simply gives back undefined, most likely due to the fact that the ajax call hasn't finished yet. Is there a way to postpone the return until the $http request has completed? I've attempted using the .success() promise without success.

javascript angularjs

Answer 1

Answer №1

$http.post will give you a promise to work with (refer to $q). To make use of the response, connect res to $scope.res:

controller:

$scope.getRequestDigest = function () {
    var url = urlParams['SPAppWebUrl'] + '/_api/contextinfo';
    $http.post(url)
    .success(function (res) {
        $scope.res = res;
    });
}

Now, you have access to $scope.res (or simply res in your template) throughout your code.

Once the promise chain is fulfilled (after success), Angular initiates a digest cycle and updates all bindings on $scope.

Answer 2

$http.post will give you a promise to work with (refer to $q). To make use of the response, connect res to $scope.res:

controller:

$scope.getRequestDigest = function () {
    var url = urlParams['SPAppWebUrl'] + '/_api/contextinfo';
    $http.post(url)
    .success(function (res) {
        $scope.res = res;
    });
}

Now, you have access to $scope.res (or simply res in your template) throughout your code.

Once the promise chain is fulfilled (after success), Angular initiates a digest cycle and updates all bindings on $scope.

Answer 3

Answer №2

Give it a shot

$scope.retrieveToken = function () {
    var link = urlParams['SPAppWebUrl'] + '/_api/contextinfo';
    return $http.post(link);
}

var tokenCall = $scope.retrieveToken();
tokenCall.then(function(response){
    console.log(response.data);
});

By following this method, you are effectively retrieving a promise, which AngularJS uses through the $q service.

If you were to display (console.log(tokenCall)) tokenCall, you will notice that there are various functions available such as success or complete, for instance.

Answer 4

Give it a shot

$scope.retrieveToken = function () {
    var link = urlParams['SPAppWebUrl'] + '/_api/contextinfo';
    return $http.post(link);
}

var tokenCall = $scope.retrieveToken();
tokenCall.then(function(response){
    console.log(response.data);
});

By following this method, you are effectively retrieving a promise, which AngularJS uses through the $q service.

If you were to display (console.log(tokenCall)) tokenCall, you will notice that there are various functions available such as success or complete, for instance.

Answer 5

Answer №3

If you want to incorporate a chain promise, utilize the .then method.

$scope.getAuthData = function () {
    var url = urlParams['AppWebUrl'] + '/_api/contextinfo';
    return $http.post(url) //this will give back a promise
    .then(function (res) {
        return res.data; //upon success, this will provide data to the calling function
    });
}

The calling function must then invoke the function and retrieve the data as shown below

$scope.getAuthData().then(function(data){
   console.log(data)
   //you can access the data returned from the `getAuthData` method here
})

Answer 6

If you want to incorporate a chain promise, utilize the .then method.

$scope.getAuthData = function () {
    var url = urlParams['AppWebUrl'] + '/_api/contextinfo';
    return $http.post(url) //this will give back a promise
    .then(function (res) {
        return res.data; //upon success, this will provide data to the calling function
    });
}

The calling function must then invoke the function and retrieve the data as shown below

$scope.getAuthData().then(function(data){
   console.log(data)
   //you can access the data returned from the `getAuthData` method here
})

The function fails to provide the $http response

Answer №1

Answer №2

Answer №3

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