[英]Add a marker on mouse click and remove the existing on in openlayers?
我正在使用Openlayers地图。 我想要一个功能,当用户单击地图时,应该创建标记,但是同时应该删除或删除地图上已经存在的现有标记,并且只有最新标记可见。
var markers = new OpenLayers.Layer.Markers( "Markers" );
markers.id = "Markers";
me.OpenLayers.addLayer(markers);
/*myMarker = new OpenLayers.Marker(new OpenLayers.Marker( 56.512438257836,27.335700987698 ));
markers.addMarker(myMarker);*/
var size = new OpenLayers.Size(30,30);
var offset = new OpenLayers.Pixel(-(size.w/2), -size.h);
var icon = new OpenLayers.Icon('http://www.openlayers.org/dev/img/marker.png',size,offset);
//map.setCenter (lonLat, zoom);
me.OpenLayers.events.register("click", kijs_map_container, function(evt) {
var lonlat = me.OpenLayers.getLonLatFromViewPortPx(evt.xy).transform(new OpenLayers.Projection("EPSG:900913"), new OpenLayers.Projection("EPSG:4326"));
$("#edit-field-jena-seta-map-openlayers-wkt").val('GEOMETRYCOLLECTION(POINT('+lonlat.lat+' '+lonlat.lon+'))');
var pos = me.OpenLayers.getLonLatFromPixel(evt.xy);
alert(baltic_long);
var marker = new OpenLayers.Marker(new OpenLayers.LonLat(baltic_lat, baltic_long),icon);
markers.addMarker(marker);
marker.events.register("click", marker, function(e){
});
//updateMaker(myMarker, pos);
});
在创建和添加新标记之前,请删除图层上的所有标记:
markers.clearMarkers();
markers.addMarker(marker);
有关更多详细信息,请参见clearMarkers 。
可能是当您将var marker
并在me.OpenLayers.events.register();
之外初始化图标时 在您再次单击新标记时,它可能会重新启动。
var marker;
icon = new OpenLayers.Icon( ... );
me.OpenLayers.events.register("click", kijs_map_container, function(evt) {
var pos = me.OpenLayers.getLonLatFromPixel(evt.xy);
marker = new OpenLayers.Marker(pos, icon);
markers.addMarker(marker);
});
至少我没有在这里测试过这个特定的例子,但这是我使用地图编辑器的经验。
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