javascript - 使用 Json 向 Google map 添加标记 |应用程序接口(interface)

Question

我正在尝试使用来自 Json 响应的数据在谷歌地图上绘制标记。我一整天都在 Stack Overflow 中搜索答案，但没有找到适合我的解决方案。

我猜这与我提取纬度和经度的方式有关，但我无法确定。下面是我的代码和 Json，Json 来自 API。

我的代码哪里出错了？

脚本

<script>   
  function initialize() {
              var myOptions = {
                  zoom: 4,
                  center: new google.maps.LatLng(34.397, 150.644),
                  mapTypeId: google.maps.MapTypeId.ROADMAP
              };

              map = new google.maps.Map(document.getElementById("map"), myOptions);
              };

  function getLocations() {

      $.getJSON("URL", function (json) {

          $.each(json["resultsPage"]["results"]["event"], function(i, entry){
              addMarker(entry.location.lat,entry.location.lng);
          });
      });
  }

  function addMarker(lat,lng) {
          marker = new google.maps.Marker({
          position: new google.maps.LatLng(lat,lng),
          map: map,
          });
          markersArray.push(marker);
  }
  </script>

JSON 响应

告知使用以下代码请求Json数据。如果我在末尾留下问号，当我通过 http://jsonlint.com 运行它时，我会收到一条无效消息。因为 Json 的开头有一个问号。将其删除似乎可以解决问题，但我不能 100% 确定这样可以吗？

    $.getJSON("http://api.songkick.com/api/3.0/events.json?location=clientip&apikey={your_api_key}&jsoncallback=?",
    function(data){
    // data is JSON response object
    });

如果我在末尾留下问号，当我通过 http://jsonlint.com 运行它时会收到一条无效消息因为 Json 的开头有一个问号。将其删除似乎可以解决问题，但我不能 100% 确定这样可以吗？

当我在调试器中查看代码时，我得到“SyntaxError: Unexpected token ':'”，但此响应来自 API，所以我不确定我能做些什么？

    {
    "resultsPage": {
    "status": "ok",
    "results": {
        "event": [
            {
                "type": "Concert",
                "status": "ok",
                "performance": [
                    {
                        "artist": {
                            "displayName": "Arcade Fire",
                            "uri": "http://www.songkick.com/artists/66758-arcade-fire?utm_source=16289&utm_medium=partner",
                            "identifier": [
                                {
                                    "mbid": "52074ba6-e495-4ef3-9bb4-0703888a9f68",
                                    "href": "http://api.songkick.com/api/3.0/artists/mbid:52074ba6-e495-4ef3-9bb4-0703888a9f68.json"
                                }
                            ],
                            "id": 66758
                        },
                        "billingIndex": 1,
                        "billing": "headline",
                        "displayName": "Arcade Fire",
                        "id": 29913729
                    },
                    {
                        "artist": {
                            "displayName": "Doody and Kami",
                            "uri": "http://www.songkick.com/artists/6334389-doody-and-kami?utm_source=16289&utm_medium=partner",
                            "identifier": [],
                            "id": 6334389
                        },
                        "billingIndex": 2,
                        "billing": "support",
                        "displayName": "Doody and Kami",
                        "id": 29913734
                    },
                    {
                        "artist": {
                            "displayName": "Leah Gordon",
                            "uri": "http://www.songkick.com/artists/6334394-leah-gordon?utm_source=16289&utm_medium=partner",
                            "identifier": [],
                            "id": 6334394
                        },
                        "billingIndex": 3,
                        "billing": "support",
                        "displayName": "Leah Gordon",
                        "id": 29913739
                    }
                ],
                "venue": {
                    "metroArea": {
                        "country": {
                            "displayName": "Canada"
                        },
                        "state": {
                            "displayName": "QC"
                        },
                        "displayName": "Montreal",
                        "uri": "http://www.songkick.com/metro_areas/27377-canada-montreal?utm_source=16289&utm_medium=partner",
                        "id": 27377
                    },
                    "lat": 45.5014288,
                    "displayName": "Phi Center",
                    "lng": -73.5564459,
                    "uri": "http://www.songkick.com/venues/1973969-phi-center?utm_source=16289&utm_medium=partner",
                    "id": 1973969
                },
                "popularity": 0,
                "location": {
                    "lat": 45.5014288,
                    "lng": -73.5564459,
                    "city": "Montreal, QC, Canada"
                },
                "start": {
                    "time": null,
                    "date": "2013-02-23",
                    "datetime": null
                },
                "displayName": "Arcade Fire with Doody and Kami and Leah Gordon at Phi Center (February 23, 2013)",
                "uri": "http://www.songkick.com/concerts/15215934-arcade-fire-at-phi-center?utm_source=16289&utm_medium=partner",
                "id": 15215934
            }
        ]
    },
    "perPage": 50,
    "page": 1,
    "totalEntries": 1
    }
    }  

如有任何帮助，我们将不胜感激。谢谢

已更新

Answer 1

能够重现您的错误。

您使用的 API 不支持回调。您需要创建一个代理，并且必须从您的代码中调用代理，您的代理将依次调用 API。

这是代码

index.html

        function getLocations() {
            $.ajax({
                type: "GET",
                url: "http://172.20.6.114/ontrack/data.php?callback=?",
                dataType: "jsonp",
                success: function(json){
                    $.each(json["resultsPage"]["results"]["event"], function(i, entry){
                        PlotMarker(entry.location.lat, entry.location.lng);
                    });
                },
                error: function(err){
                    console.log(err);
                }
            });
        }

        function PlotMarker(lat, lon){
            var marker = new google.maps.Marker({
                position: new google.maps.LatLng(lat, lon),
                map: gmap,
                draggable: false,
                animation: google.maps.Animation.DROP
            });
            markerLocations.push(marker);
        }

data.php 的代码

<?
$ch = curl_init();

curl_setopt($ch, CURLOPT_URL,"http://api.songkick.com/api/3.0/events.json?location=clientip&apikey={your_api_key}");

// receive server response ...
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$server_output = curl_exec($ch);

curl_close($ch);

echo $_GET['callback'] . '(' . $server_output . ');';
?>

然后它就会出现。