Promise XHR not work.

Question

function loadlist() {
    new WinJS.Promise(function () {
        WinJS.xhr({ url: "http://abc.com/list/" }).then(function (result) {
            // Promise not work here.
            if (result.status == 200) {
                var allLink = [];
                /*
                Parse result to allLink
                allLink = [
                    "http://abc.com/list/a.html",
                    "http://abc.com/list/b.html",
                    "http://abc.com/list/c.html"
                ]
                */
                $("#status").html("Total: " + allLink.length);
                var i = 0, tdName = [], tdAge = [];
                allLink.map(function (url) {
                    $("#status2").html("Loading: " + i + "/" + allLink.length);
                    WinJS.xhr({ url: url }).then(function (content) {
                        /*
                            Parse content to tdName & tdAge
                            json stringify and save
                        */
                    });
                    i++;
                });
            } else {
                console.log('xhr fail');
            }
        }, function (result) {
            console.log(result.statusText);
        }, function (result) {
            console.log(result.readyState);
        });
    });
}

Some one help please, xhr in xhr not work with promise.

Answer 1

Hi nhattuanbl,

Try to use .done() instead of .then() here.

--James

---

We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
Click HERE to participate the survey.

Answer 2

Replace all .then() to .done() not work.
 It make all another action stop working while this promise runing.

Answer 3

Hi nhattuanbl,

I read your code again and found there is a loop and you do the async action in the loop, which will definitely cause some problem, I would suggest you to go through the blog: Async Iteration Pattern (using WinJS promises) and modify your code to see if this works.

--James

---

We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
Click HERE to participate the survey.