在我的程序的先前版本中,我使用标记来标记地图上的点.在当前版本中,我不得不从标记更改为向量,因为我需要额外的灵活性.在标记解决方案中,我使用下面的函数向标记添加一个弹出框：
function createPopupBoxFeature(vector,lonLat,description) { var feature = new OpenLayers.Feature(vector,lonLat); feature.closeBox = true; feature.popupClass = OpenLayers.Class(OpenLayers.Popup.AnchoredBubble,{ "autoSize": true }); feature.data.popupContentHTML = description; vector.events.register("mousedown",feature,function(evt) { if (this.popup == null) { this.popup = this.createPopup(this.closeBox); map.addPopup(this.popup); this.popup.show(); } else { this.popup.toggle(); } OpenLayers.Event.stop(evt); }); return feature; }
解决方法
实际上,官方的做法如下：
(注意：某些变量尚未在这些片段中声明：longt,lat,map)
http://dev.openlayers.org/examples/light-basic.html
//Step 1 - create the vector layer
var vectorLayer = new OpenLayers.Layer.Vector("ExampleLayer",{
eventListeners:{
'featureselected':function(evt){
var feature = evt.feature;
var popup = new OpenLayers.Popup.FramedCloud("popup",OpenLayers.LonLat.fromString(feature.geometry.toShortString()),null,feature.attributes.message+"<br>"+feature.attributes.location,true,null
);
popup.autoSize = true;
popup.maxSize = new OpenLayers.Size(400,800);
popup.fixedRelativePosition = true;
feature.popup = popup;
map.addPopup(popup);
},'featureunselected':function(evt){
var feature = evt.feature;
map.removePopup(feature.popup);
feature.popup.destroy();
feature.popup = null;
}
}
});
//Step 2 - add feature to layer
var p = new OpenLayers.Geometry.Point(longt,lat);
var feature = new OpenLayers.Feature.Vector(
p.transform(new OpenLayers.Projection("EPSG:4326"),map.getProjectionObject()),{message:'foo',location:'bar'},{externalGraphic: '../img/marker.png',graphicHeight: 21,graphicWidth: 16}
);
vectorLayer.addFeatures(feature);
//Step 3 - create the selectFeature control
var selector = new OpenLayers.Control.SelectFeature(vectorLayer,{
hover:true,autoActivate:true
});
//Step 4 - add the layer and control to the map
map.addControl(selector);
map.addLayer(vectorLayer);
