我有一个谷歌地图，我必须将数据库中的数据显示到谷歌地图中。我已经这样做了，我正在从 mysql 数据库中获取数据到谷歌地图中。所有城市都从数据库中填充，现在我必须在两者之间画一条线我从数据库中填充的城市。这是我到目前为止所做的代码..
<script type="text/javascript">
/*This is */
function getCallbackFunction(req, processData) {
// Return an anonymous function that listens to the
// XMLHttpRequest instance
return function () {
// If the request's status is "complete"
if (req.readyState == 4) {
if (req.status == 200) {
// Pass the XML payload of the response to the
// handler function
processData(req.responseXML);
} else {
// An HTTP problem has occurred
alert("HTTP error: "+req.status);
}
}
}
}
//]]>
</script>
<script type="text/javascript">
//<![CDATA[
var gmarkers = [];
function getMarker(id) {
for (var i = 0; i <= gmarkers.length; i++) {
var marker = gmarkers[i];
if (marker.id == id) {
return marker;
}
}
return null;
}
function load() {
if (GBrowserIsCompatible()) {
var i = 0;
var baseIcon = new GIcon();
baseIcon.iconSize=new GSize(12,12);
baseIcon.shadowSize=new GSize(12,12);
baseIcon.iconAnchor=new GPoint(6,6);
baseIcon.infoWindowAnchor=new GPoint(6,6);
var pinIcon = new GIcon(baseIcon, "http://maps.google.co.uk/intl/en_ALL/mapfiles/ms/micons/red-dot.png", null, null);
// A function to create the marker and set up the event window
function createLibraryMarker(point,name,id) {
var baseIcon = new GIcon();
baseIcon.iconSize=new GSize(20,12);
baseIcon.shadowSize=new GSize(20,12);
baseIcon.iconAnchor=new GPoint(10,6);
baseIcon.infoWindowAnchor=new GPoint(10,0);
var icon = new GIcon(baseIcon, "images/smaller-library-icon.gif", null, null);
var marker = new GMarker(point,icon);
// === store the name so that the tooltip function can use it ===
marker.tooltip = '<div class="tooltip">'+name+'</div>';
marker.id = id;
GEvent.addListener(marker, "click", function() {
openInfoWindow(marker,"" + id);
});
gmarkers[i] = marker;
i++;
map.addOverlay(marker);
// ====== The new marker "mouseover" and "mouseout" listeners ======
GEvent.addListener(marker,"mouseover", function() {
showTooltip(marker);
});
GEvent.addListener(marker,"mouseout", function() {
tooltip.style.visibility="hidden"
});
}
//
// The list of city markers, loaded only once
//
var cityMarkers = null;
function displayCities() {
if (cityMarkers == null) {
loadCities();
} else {
displayCityMarkers();
}
}
function loadCities() {
// Read the data from data.xml
var request = GXmlHttp.create();
request.open("GET", "/maps/LibraryDirectory?method=findAllCities", true);
request.onreadystatechange = getCallbackFunction(request, processCityData);
request.send(null);
}
/**
* Process the city list in XML form, store it in cityMarkers,
* and display the markers.
*/
function processCityData(xmlDoc) {
cityMarkers = xmlDoc.documentElement.getElementsByTagName("marker");
displayCityMarkers();
}
function displayCityMarkers() {
map.clearOverlays();
for (var i = 0; i < cityMarkers.length; i++) {
// obtain the attribues of each marker
var lat = parseFloat(cityMarkers[i].getElementsByTagName("latitude")[0].firstChild.nodeValue);
var lng = parseFloat(cityMarkers[i].getElementsByTagName("longitude")[0].firstChild.nodeValue);
var id = cityMarkers[i].getElementsByTagName("id")[0].firstChild.nodeValue;
var label = cityMarkers[i].getElementsByTagName("name")[0].firstChild.nodeValue;
// create the marker
createCityMarker(new GLatLng(lat,lng),label,id);
}
}
function createCityMarker(point,name,id) {
var marker = new GMarker(point,pinIcon);
// === store the name so that the tooltip function can use it ===
marker.tooltip = '<div class="tooltip">'+name+'</div>';
marker.id = id;
marker.point = point;
GEvent.addListener(marker, "click", function(point) {
map.setCenter(new GLatLng(marker.point.y,marker.point.x),10);
});
gmarkers[i] = marker;
i++;
map.addOverlay(marker);
// ====== The new marker "mouseover" and "mouseout" listeners ======
GEvent.addListener(marker,"mouseover", function() {
showTooltip(marker);
});
GEvent.addListener(marker,"mouseout", function() {
tooltip.style.visibility="hidden"
});
}
// ====== This function displays the tooltip ======
function showTooltip(marker) {
tooltip.innerHTML = marker.tooltip;
var point=map.getCurrentMapType().getProjection().fromLatLngToPixel(map.fromDivPixelToLatLng(new GPoint(0,0),true),map.getZoom());
var offset=map.getCurrentMapType().getProjection().fromLatLngToPixel(marker.getPoint(),map.getZoom());
var anchor=marker.getIcon().iconAnchor;
var width=marker.getIcon().iconSize.width;
var height=tooltip.clientHeight;
var pos = new GControlPosition(G_ANCHOR_TOP_LEFT, new GSize(offset.x - point.x - anchor.x + width, offset.y - point.y -anchor.y -height));
pos.apply(tooltip);
tooltip.style.visibility="visible";
}
// ===== This function is invoked when the mouse leaves an entry in the sidebar =====
// It hides the tooltip
function mymouseout() {
tooltip.style.visibility="hidden";
}
var myTrip = {
center:x,
zoom:4,
mapTypeId:google.maps.MapTypeId.ROADMAP
};
// create the map
var map = new google.maps.Map(document.getElementById("map"),myTrip);
map.addControl(new GLargeMapControl());
map.addControl(new GOverviewMapControl());
map.enableDoubleClickZoom();
map.setCenter(new GLatLng(28.6100, 77.2300), 5);
// ====== set up marker mouseover tooltip div ======
var tooltip = document.createElement("div");
map.getPane(G_MAP_FLOAT_PANE).appendChild(tooltip);
tooltip.style.visibility="hidden";
displayCities();
GEvent.addListener(map, "zoomend", function(oldZoom, newZoom) {
if ((oldZoom <= 8) && (newZoom > 8)) {
//
// Switch to city markers
//
displayLibraries();
} else if ((oldZoom > 8) && (newZoom <= 8)) {
//
// Switch to library markers
//
displayCities();
}
});
}
else {
alert("Sorry, the Google Maps API is not compatible with this browser");
}
}
//]]>
</script>
</head>
<body onload="load()" onunload="GUnload()">
<div id="map" style="width: 900px; height: 500px"></div>
var lat,var lng 这是来自数据库的纬度和经度。我必须用这个 lat long 画线，请有人帮忙