javascript 在 Google Maps v3 中切换 KML 图层
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Toggle KML Layers in Google Maps v3
提问by kaoscify
回答by efwjames
Sorry my article didn't work for you, it is a little dated.
抱歉，我的文章对您不起作用，它有点过时了。
Here is a full example of a typical Gmaps toggle assuming you are using kml files.
这是一个典型的 Gmaps 切换的完整示例，假设您使用的是 kml 文件。
<html>
<head>
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
var map;
// lets define some vars to make things easier later
var kml = {
a: {
name: "MPLS/STPL",
url: "https://maps.google.com/maps/ms?authuser=0&vps=5&ie=UTF8&msa=0&output=kml&msid=212971981154994583939.0004b06640255267e038c"
},
b: {
name: "Bicycling Tour Routes",
url: "https://maps.google.com/maps/ms?authuser=0&vps=4&ie=UTF8&msa=0&output=kml&msid=212971981154994583939.0004902a1824bbc8c0fe9"
}
// keep adding more if ye like
};
// initialize our goo
function initializeMap() {
var options = {
center: new google.maps.LatLng(44.9812, -93.2687),
zoom: 13,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("map_canvas"), options);
createTogglers();
};
google.maps.event.addDomListener(window, 'load', initializeMap);
// the important function... kml[id].xxxxx refers back to the top
function toggleKML(checked, id) {
if (checked) {
var layer = new google.maps.KmlLayer(kml[id].url, {
preserveViewport: true,
suppressInfoWindows: true
});
// store kml as obj
kml[id].obj = layer;
kml[id].obj.setMap(map);
}
else {
kml[id].obj.setMap(null);
delete kml[id].obj;
}
};
// create the controls dynamically because it's easier, really
function createTogglers() {
var html = "<form><ul>";
for (var prop in kml) {
html += "<li id=\"selector-" + prop + "\"><input type='checkbox' id='" + prop + "'" +
" onclick='highlight(this,\"selector-" + prop + "\"); toggleKML(this.checked, this.id)' \/>" +
kml[prop].name + "<\/li>";
}
html += "<li class='control'><a href='#' onclick='removeAll();return false;'>" +
"Remove all layers<\/a><\/li>" +
"<\/ul><\/form>";
document.getElementById("toggle_box").innerHTML = html;
};
// easy way to remove all objects
function removeAll() {
for (var prop in kml) {
if (kml[prop].obj) {
kml[prop].obj.setMap(null);
delete kml[prop].obj;
}
}
};
// Append Class on Select
function highlight(box, listitem) {
var selected = 'selected';
var normal = 'normal';
document.getElementById(listitem).className = (box.checked ? selected: normal);
};
function startup() {
// for example, this toggles kml b on load and updates the menu selector
var checkit = document.getElementById('b');
checkit.checked = true;
toggleKML(checkit, 'b');
highlight(checkit, 'selector1');
}
</script>
<style type="text/css">
.selected { font-weight: bold; }
</style>
</head>
<body onload="startup()">
<div id="map_canvas" style="width: 100%; height: 600px;"></div>
<div id="toggle_box" style="position: absolute; top: 100px; right: 20px; padding: 10px; background: #fff; z-index: 5; "></div>
</body>
</html>
This is pure js so of course using jQuery you can do things a little easier. Hope this helps!
这是纯 js 所以当然使用 jQuery 你可以做的事情更容易一些。希望这可以帮助！
回答by Engineer
For toggling kml layer you can try this function:
要切换 kml 层，您可以尝试使用此功能：
/** Toggles layer
* @param {google.maps.KmlLayer} layer
* @param {google.maps.Map} map
**/
function toggleLayer( layer, map ){
layer.setMap( layer.getMap() ? null : map );
}
Store your layers in array for farther actions (e.g. toggling).
将您的图层存储在数组中以进行更远的操作（例如切换）。
Then you can toggle layer by it's index on that array:
然后你可以通过它在该数组上的索引来切换图层：
toggleLayer( layersArray[index], map );
Or to apply toggling to all layers:
或者将切换应用于所有图层：
for( var index = 0; index < layersArray.length; ++index){
toggleLayer( layersArray[index], map );
}
