使用GEOJson格式的Openlayers中的独立功能选择

Question

我正在使用OpenLayers并加载几个完美工作的GEOJson文件。现在我想能够选择GEOJson文件的单个组件。例如，如果我激活悬停选择时有多个特征（几个多边形），则不会发生任何情况。

我添加悬停选择该示例http://openlayers.org/dev/examples/geojson.html

我实际上可以独立地拖动元件，但我不能选择它们。我认为这是因为我使用的投影。任何想法如何解决它？

干杯！

function init(){ 

var options = { 
    projection: new OpenLayers.Projection("EPSG:900913"), 
    displayProjection: new OpenLayers.Projection("EPSG:4326"), 
    units: "m", 
    numZoomLevels: 18, 
}; 

map = new OpenLayers.Map('map', options); 
var mapnik = new OpenLayers.Layer.OSM({layers: 'basic'});   
map.addLayer(mapnik); 

map.addControl(new OpenLayers.Control.MousePosition()); 

var lon = 12.18; 
var lat = 53.81; 
var lonLat = new OpenLayers.LonLat(lon,lat).transform(map.displayProjection, map.projection); 

var mapcent = new OpenLayers.LonLat(lon, lat).transform(map.displayProjection, map.projection); 
zoom = 5.5; 
map.setCenter(mapcent, zoom); 
document.getElementById('noneToggle').checked = true; 

var proj = new OpenLayers.Projection("EPSG:4326"); 

var file = []; 
file[0] = "geojson/nuts3.geojson"; 

var style = []; 

i=0; 
while(i<file.length){ 
    style[i] = new OpenLayers.StyleMap({ 
     pointRadius: 2, 
     strokeColor: 'red', 
     strokeWidth: 1, 
     strokeOpacity: 1, 
     fillColor: 'red', 
     fillOpacity: 0.2 
    }); 

    var layer_name = "layer_" + i; 
    vectorLayer[i] = new OpenLayers.Layer.Vector(layer_name, { 
     styleMap: style[i], 
     projection: map.displayProjection, 
     preFeatureInsert: function(feature){ 
     feature.geometry.transform(proj, map.getProjectionObject()); 
     }, 
    }); 
    map.addLayer(vectorLayer[i]); 

    var gjson = new OpenLayers.Format.GeoJSON(); 
    var featurecollection = ReadFile(file[i]); 
    //Readfile is just a normal Request.POST function 
    vectorLayer[i].addFeatures(gjson.read(featurecollection)); 
    i=i+1; 
} 

controls = { 
    selecthover: new OpenLayers.Control.SelectFeature(vectorLayer[0],{ 
     hover: true, 
     highlightOnly: true 
    }) 
}; 

for(var key in controls) { 
    map.addControl(controls[key]); 
    controls[key].activate(); 

} 

      var report = function(e) { 
      OpenLayers.Console.log(e.type, e.feature.id); 
     }; 

     var highlightCtrl = new OpenLayers.Control.SelectFeature(vectors, { 
      hover: true, 
      highlightOnly: true, 
      renderIntent: "temporary", 
      eventListeners: { 
       beforefeaturehighlighted: report, 
       featurehighlighted: report, 
       featureunhighlighted: report 
      } 
     }); 


     map.addControl(highlightCtrl); 
     map.addControl(selectCtrl);    
} 

的GeoJSON的文件看起来像

{ “类型”： “的FeatureCollection”， “功能”： { “类型”： “功能”， “ID”：0，“属性“：{}，”geometry“：{”type“：”Polygon“，”coordinates“：[[[9.244170,48.847009]，[9.246171,48.822260]，[9.248220,48.796910]，[9.248433,48.794277] [9.290007,48.791633]，[9.298732,48.785304]，[9.145165,48.859655]，[9.153553,48.861241]，[9.207493,48.852769]，[9.235667,48.848344]，[9.244170,48.847009]]]}} , {“type “：”Feature“，”id“：1，”正确关系“：{}，”geometry“：{”type“：”Polygon“，”coordinates“：[[[9.064848,48.755577]，[9.038994,48.741317]，[9.104720,48.709080]，[9.104721,48.709079] 9.146561，48.663574]，[9.156822，48.652414]，[9.162166，48.646602]，[9.174173，48.633544]，[9.064848，48.755577]]]}} ， ...等

Answer 1

OK我解决它。

https://gis.stackexchange.com/questions/25314/change-vector-projection-in-openlayers

继这个问题的正确答案提出的投影，并使用独立的ID为GeoJSON的文件，可以悬停选择的每一个部分。