将后台进程添加到我的 Windows Phone 应用

Question

我有一个运行WinJS进程线程的Windows Phone Phonegap/Cordova应用程序。但是，这确实需要在应用程序初始化和后台运行 - 间隔轮询。

我基本上想做的是有一个PhoneGap应用程序，该应用程序执行AJAX调用作为后台进程，以便在文件从服务器发送时保持最新状态。

setInterval(function() {
    // Check data with $.ajax();
}, 30000);

我一直在用这个撕扯我的头发，我尝试了太多代码，我的大脑被炸了。我确信一定是可能的，但我无法弄清楚如何将 AJAX 调用作为后台服务运行......

先发制人的"为帮助的男孩和女孩加油"！

Answer 1

您需要在

应用程序启动时以及每次计时器用完时更新一些信息。对吗？

我会这样做：

function yourMainFunction(){
    try{
        if(localStorage){
            //A flag that indicates if it is App Instalation (First Use) or Not
            if(!localStorage.appRunFirstTime){
                callLoadingStructure();
                //Assuming that you data file is a TXT file and we have a JSON Structure inside it
                setTimeout(function(){
                    $.ajax({
                        type: 'GET',
                        dataType: 'text',
                        url: 'yourSite/yourData.txt',
                        success: function (data) {
                            var content = JSON.parse(data);
                            //The JSON parsed DATA
                            doWhateverYouNeedWithTheData(content);//This method should use the data from your server
                            localStorage.setItem("appRunFirstTime", "OK!!!");
                            closeLoadingStructure();
                        }
                        error: function(errowThrown){
                            console.log(errowThrown);
                        }
                    });
                //Minimun timeout to show Loading Structure even if the request works without any lag
                }, 1000);
            }
            //App is already instaled
            else{
                setInterval(function(){
                    $.ajax({
                        type: 'GET',
                        dataType: 'text',
                        url: 'yourSite/yourData.txt',
                        success: function (data) {
                            var content = JSON.parse(data);
                            //The JSON parsed DATA
                            doWhateverYouNeedWithTheData(content);
                            //updateDOM?(); if you need to update the DOM when new information comes up
                        }
                        error: function(errowThrown){
                            console.log(errowThrown);
                        }
                    });
                //Minimun timeout to show Loading Structure even if the request works without any lag
                }, 30000);
            }
        }
    }
    catch(error){
        console.log(error);
    }
}
function callLoadingStructure(){
    //Its a example of a loading structure while the first content loads
    document.getElementById("yourMainContentDiv").style.display = "none";
    document.getElementById("yourLoadingDiv").style.display = "block";
}
function closeLoadingStructure(){
    //Cloasing loading structure and showing maindiv
    document.getElementById("yourMainContentDiv").style.display = "block";
    document.getElementById("yourLoadingDiv").style.display = "none";
}

希望对您有所帮助。此致敬意！