Mastering the art of properly connecting Angular HttpPromise

Recently, I encountered an angular Service containing a crucial function:

    service.getItemByID = function(id) {
        var hp = $http({method: "GET", url: "service/open/item/id",
            headers: {"token": $rootScope.user.token},
            params: {"id": id}});

        return hp;
    };

The challenge at hand involved manipulating the returned values before passing them further while maintaining the structure of HttpPromise to ensure compatibility with the existing controller code that relies on the success and failure functions of the HttpPromise.

In order to address this, I revamped the service code as follows:

    service.getItemByID = function(id) {
        var hp = $http({method: "GET", url: "service/open/item/id",
            headers: {"token": $rootScope.user.token},
            params: {"id": id}});

        var newHP = hp.success(
                function(data, status, headers, config) {
                    data.x = "test";  //TODO: add full manipulation
                    alert("success");
                    return hp;
                });

        return newHP;
    };

After implementation, this revised code proved effective regardless of returning hp or newHP. Thus, the question arises: Is this method of HttpPromise chaining considered appropriate?

Answer №1

When you call .success, the deferred object remains the same and no new object is created. It simply adds a success callback to the deferred object.

You have the option to use either the new reference or stick with the original reference:

service.getItemByID = function(id) {
    var hp = $http({method: "GET", url: "service/open/item/id",
        headers: {"token": $rootScope.user.token},
        params: {"id": id}});

    hp.success(
            function(data, status, headers, config) {
                data.x = "test";  //TODO: add full manipulation
                alert("success");
                return hp;
            });

    return hp;
};

If desired, you can chain all the calls together and directly return the deferred object:

service.getItemByID = function(id) {
    return $http({
        method: "GET",
        url: "service/open/item/id",
        headers: {"token": $rootScope.user.token},
        params: {"id": id}
    })
    .success(function(data, status, headers, config) {
        data.x = "test";
        alert("success");
    });
};

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