C# Bing映射Ajax API v7地理位置回调

I用户Bing映射Ajax v7 API以从示例中获取用户的位置

如果用户不允许获取位置，是否可以等待回调执行，直到我获取用户位置的经度、纬度或错误

    function test() {
          //Call GetMap() to get position
          GetMap();
          //Wait until callback is finished
         //Do something with user's location (result of the callback)

     }

     function GetMap()
     {

        // Set the map options
        var mapOptions = {credentials:"Bing Maps Key"};


        // Initialize the map
        var map = new Microsoft.Maps.Map(document.getElementById("mapDiv"), mapOptions);

        // Initialize the location provider
        var geoLocationProvider = new Microsoft.Maps.GeoLocationProvider(map);

        // Get the user's current location
        geoLocationProvider.getCurrentPosition({successCallback:displayCenter});

        //Execute some more code with user's location
     }

     function displayCenter(args)
     {
        // Display the user location when the geo location request returns
        alert("The user's location is " + args.center);
     }

---

在JavaScript中，我不认为您可以显式地挂起执行并等待回调完成，如这里所述：如果您有一些依赖于get position回调结果的逻辑，为什么不将该逻辑作为回调的一部分来调用呢？你不需要明确地等待它。关于你想要完成的事情，像这样的事情是你想要的吗

var map;
function test() {
      //Call GetMap() to get position
      GetMap();
      //Wait until callback is finished
     //Do something with user's location (result of the callback)

 }

 function GetMap()
 {

    // Set the map options
    var mapOptions = {credentials:"Bing Maps Key"};


    // Initialize the map
    map = new Microsoft.Maps.Map(document.getElementById("mapDiv"), mapOptions);

    // Initialize the location provider
    var geoLocationProvider = new Microsoft.Maps.GeoLocationProvider(map);

    // Get the user's current location
    geoLocationProvider.getCurrentPosition({successCallback:displayCenter},{errorCallback:onError});
 }

function onPositionReady(position) {
    // Execute some more code with user's location
    // For Example...
    // Apply the position to the map
    var location = new Microsoft.Maps.Location(position.coords.latitude,
        position.coords.longitude);
    map.setView({ zoom: 18, center: location });

    // Add a pushpin to the map representing the current location
    var pin = new Microsoft.Maps.Pushpin(location);
    map.entities.push(pin);
}

function onError(err) {
    switch (err.code) {
        case 0:
            alert("Unknown error");
            break;
        case 1:
            alert("The user said no!");
            break;
        case 2:
            alert("Location data unavailable");
            break;
        case 3:
            alert("Location request timed out");
            break;
    }
}

更新： 如果要将参数传递到回调中，可以使用函数绑定覆盖回调中的

this

关键字，并以这种方式传递参数：

例如，如果将

myObject

设置为包含参数，则可以按如下方式传递：

 geoLocationProvider.getCurrentPosition({ successCallback: onPositionReady.bind(myObject) }, { errorCallback: onError });

然后，通过

this

关键字访问回调中的myObject：

function onPositionReady(position) {
    var myProperty = this.yourProperty;  // this now refers to myObject
    // Execute some more code with user's location
    // For Example...
    // Apply the position to the map
    var location = new Microsoft.Maps.Location(position.coords.latitude,
        position.coords.longitude);
    map.setView({ zoom: 18, center: location });

    // Add a pushpin to the map representing the current location
    var pin = new Microsoft.Maps.Pushpin(location);
    map.entities.push(pin);
}

---

问题是我想在回调中包含一些变量，但我没有找到传递它们的方法。我不想将它们声明为全局变量。我认为这不是正确的解决方案。@salamis如果我理解正确，您想将变量传递到回调中吗？如果是的话，请看我的最新答案。非常感谢你的朋友。我试试看。