The $http function in AngularJS consistently returns undefined instead of the expected value

var result = dataService.makeHttpRequest("GET", "/documents/checkfilename/", null,
            function (response, status, headers, config) {
                // I can see `true` if I alert(response); here
                // I want to return the contents of response because
                // it's a true/false and would perform tasks based
                // on it being true or false.

                return response;
            });

alert(result); // this should alert `true` or `false` but is `undefined`

Why does alert(result) always return undefined? I know that response in the above function has true or false, I am able to alert it; but, I want to return it and do things only when it is true.

The dataService.makeHttpRequest service function looks like the following:

dataService.makeHttpRequest = function(requestType, urlString, dataObject, successFunc, errorFunc) {
    $http({
        method:requestType, 
        url:$rootScope.serverAddress+urlString,
        data:dataObject
        })
        .success(successFunc)
        .error(errorFunc);
};

Answer №1

If your function makeHttpRequest is returning undefined, it could be because it lacks a return statement.

Even if you were to return the result of the $http call, it might not give you the desired outcome. Callbacks are essential for handling asynchronous operations, especially when working with data from an HTTP response.

Using the promise returned by $http() can offer a more organized approach:

dataService.makeHttpRequest = function(requestType, urlString, dataObject) {
    return $http({
        method:requestType, 
        url:$rootScope.serverAddress+urlString,
        data:dataObject
    });
};

dataService.makeHttpRequest("GET", "/documents/checkfilename/", null).success(function (data, status, headers, config) {
     //Handle data here
}); //You can also add ".error" to specify an error callback

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