74 行
2 KiB
JavaScript
74 行
2 KiB
JavaScript
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var map;
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var ajaxRequest;
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var plotlist;
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var plotlayers=[];
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function initmap() {
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// set up AJAX request
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ajaxRequest=getXmlHttpObject();
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if (ajaxRequest==null) {
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alert ("This browser does not support HTTP Request");
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return;
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}
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// set up the map
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map = new L.Map('map');
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// create the tile layer with correct attribution
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var osmUrl='https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png';
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var osmAttrib='Map data © <a href="https://openstreetmap.org">OpenStreetMap</a> contributors';
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var osm = new L.TileLayer(osmUrl, {minZoom: 1, maxZoom: 9, attribution: osmAttrib});
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// start the map in South-East England
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map.setView(new L.LatLng(q_lat, q_lng), q_zoom);
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map.addLayer(osm);
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askForPlots();
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map.on('moveend', onMapMove);
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}
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function getXmlHttpObject() {
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if (window.XMLHttpRequest) { return new XMLHttpRequest(); }
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if (window.ActiveXObject) { return new ActiveXObject("Microsoft.XMLHTTP"); }
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return null;
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}
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function askForPlots() {
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// request the marker info with AJAX for the current bounds
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ajaxRequest.onreadystatechange = stateChanged;
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ajaxRequest.open('GET', qso_loc, true);
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ajaxRequest.send(null);
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}
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function stateChanged() {
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// if AJAX returned a list of markers, add them to the map
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if (ajaxRequest.readyState==4) {
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//use the info here that was returned
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if (ajaxRequest.status==200) {
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plotlist=eval("(" + ajaxRequest.responseText + ")");
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plotlist = plotlist['markers'];
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removeMarkers();
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for (i=0;i<plotlist.length;i++) {
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var plotll = new L.LatLng(plotlist[i].lat,plotlist[i].lng, true);
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var plotmark = new L.Marker(plotll);
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plotmark.data=plotlist[i];
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map.addLayer(plotmark);
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plotmark.bindPopup("<h3>"+plotlist[i].label+"</h3>"+plotlist[i].html);
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plotlayers.push(plotmark);
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}
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}
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}
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}
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function removeMarkers() {
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for (i=0;i<plotlayers.length;i++) {
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map.removeLayer(plotlayers[i]);
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}
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plotlayers=[];
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}
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function onMapMove(e) {
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askForPlots();
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}
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