我有一张 map ，已从 V2 移植到 V3，并且我正在尝试更新代码以在设定的时间刷新 KML 数据。在本例中每 30 秒一次。它只是假设更新 map 上的数据并显示下次更新发生的倒计时。
这里是它在 V2 中的工作方式的工作版本。
这是我更新的V3脚本中的相关代码，但它不起作用。我没有收到任何错误，所以我不确定我做错了什么。这在 V2 上可以工作，但我无法让它在 V3 上工作。我错过和忽略了什么？
//This calls genkml.php on every refresh cycle to generate a new kml file
function UpdateKML() {
//document.getElementById('TheDiv').innerHTML = '0';
var xmlhttp=false;
if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
try {
xmlhttp = new XMLHttpRequest();
} catch (e) {
xmlhttp=false;
}
}
if (!xmlhttp && window.createRequest) {
try {
xmlhttp = window.createRequest();
} catch (e) {
xmlhttp=false;
}
}
xmlhttp.open("GET", "genkml.php?force=" + force + "&ofd=" + KMLdate + "&nsd=" + NSdate + "&dbg=" + dbg + "&rand="+(new Date()).valueOf(),true);
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4) {
var resp = xmlhttp.responseText;
//if (resp === undefined) resp = ''; // If we get a bad response, just set resp to nothing
if (dbg == 'y') { // Check if we want debug info
var tmpresp = resp;
if (tmpresp === undefined) tmpresp = ' ';
if (document.getElementById('div1') == null) { // Check if debug div exists, if not add it to end of body
var divTag = document.createElement("div");
divTag.id = "div1";
divTag.innerHTML = 'Response Status: ' + xmlhttp.status + '<br />' + tmpresp;
document.body.appendChild(divTag);
} else { // Otherwise just update the info
document.getElementById('div1').innerHTML = 'Response Status: ' + xmlhttp.status + '<br />' + tmpresp;
}
} else { // Else check if debug div exists and remove it (will take an update to remove
if (document.getElementById('div1') != null) document.body.removeChild(document.getElementById("div1"));
}
if (resp !== undefined) { // Make sure we got data
KMLdate = resp.split("|")[0].split("~")[0];
NSdate = resp.split("|")[0].split("~")[1];
updateHTML(resp); // This calls the updateHTML function if there is info returned
}
}
}
xmlhttp.send(null);
// add back overlays
nyLayer = new google.maps.KmlLayer(null);
nyLayer.setMap(null); // Remove overlays
var nyLayer = new google.maps.KmlLayer(URLToKML + "?rand="+(new Date()).valueOf(),
{
suppressInfoWindows: false,
map: map,
preserveViewport: true,
zIndex: 999
});
// Time overlayed on map - could be in updateHTML() to just show when .kml read last
var time = CurrentTime ("B", "12a", true, TZOffset)
document.getElementById('currenttime').innerHTML = time;
}
function CurrentTime (type, hours, secs, ofs) {
/*
type (char) hours (char) secs (bool) ofs (num)
"U"-UTC "24"=24 hr time true=hh:mm:ss 0=hours from UTC
"B"-User's Browser "12"=12 hr time false=hh:mm
"S"-Web Site "12a"=am/pm
*/
if (type == null){ type = "B"; } // These are the defaults
if (hours == null){ hours = "12a"; }
if (secs == null){ secs = true; }
if (ofs == null){ ofs = 0; }
var currentHour = 0;
var currentMinute = 0;
var currentSecond = 0;
var time = 0;
var currentDate = new Date();
if (type == "U") {
currentHour = currentDate.getUTCHours(); // UTC
} else if (type == "B") {
currentHour = currentDate.getHours(); // Viewer's time
} else {
currentHour = currentDate.getUTCHours() + ofs; // your local time
if(currentHour < 0) { currentHour = currentHour + 24;}
}
currentMinute = currentDate.getMinutes();
currentMinute = (currentMinute < 10 ? "0" : "") + currentMinute;
if (hours == "24") {
if(currentHour == 24) { currentHour = 0 }; // use if wanting 24 hour time
currentHour = (currentHour < 10 ? "0" : "") + currentHour;
} else if (hours == "12") {
if(currentHour == 0) currentHour = 12;
currentHour = (currentHour < 10 ? "0" : "") + currentHour;
} else {
if(currentHour == 0) currentHour = 12; // else no leading zero for am/pm
}
time = currentHour + ":" + currentMinute;
if (secs) {
currentSecond = currentDate.getSeconds();
currentSecond = (currentSecond < 10 ? "0" : "") + currentSecond;
time = time + ":" + currentSecond;
}
if (hours == "12a") {
time = time + " " + (currentHour > 12 ? "PM" : "AM");
}
return time;
}
//This function is only used if you leave the debug checkbox below
// You can remove this function and the checkbox and set the debug
// mode using the dbg=y query parameter
function debug(obj){
if (obj.checked) {
dbg='y';
} else {
dbg='n';
if (document.getElementById('div1') != null) document.body.removeChild(document.getElementById("div1"));
//document.getElementById('TheDiv').innerHTML = '';
}
}
//This function is only used if you leave the Force Update checkbox below
// You can remove this function and the checkbox and set the force
// mode using the force=y query parameter
function forceupdate(obj){
if (obj.checked) {
force='y';
} else {
force='n';
}
}
//This function parses out the query parameter value
function gup( name ){
name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
var regexS = "[\\?&]"+name+"=([^&#]*)";
var regex = new RegExp( regexS );
var results = regex.exec( window.location.href );
if( results == null )
return "";
else
return results[1];
}
如果有人需要查看，这里是 V3 的完整 .js map 代码的链接。
编辑:我认为这与这段代码有关，该代码段应该删除然后将更新的 KML 数据添加到 map 中。
这是 V2 版本，现在已折旧。
// add back overlays
map.removeOverlay(geoXml); //Remove overlays
geoXml = new GGeoXml(URLToKML + "?rand="+(new Date()).valueOf() ); //rand is used to trick google maps into thinking this is a new KML (don't use cache version)
map.addOverlay(geoXml); //Add the new data from the newly generated KML
我为 V3 更新了代码，替换了通过搜索找到的上述已折旧的 V2 代码段。不确定这是否正确，但这是我能找到的全部。
// add back overlays
nyLayer = new google.maps.KmlLayer(null);
nyLayer.setMap(null); // Remove overlays
function refresh(layer) {
var nyLayer = new google.maps.KmlLayer(URLToKML + "?rand="+(new Date()).valueOf(),
{
suppressInfoWindows: false,
map: map,
preserveViewport: true,
zIndex: 999
});
}
最佳答案
我把它整理好并开始工作，我知道这是一个简单的编辑，但我很难找到解决方案。如果其他人这可以帮助这就是我所做的。
在 V2 版本中对此进行了更改。
updateHTML(resp); //This calls the updateHTML function if there is info returned
}
}
}
xmlhttp.send(null);
// add back overlays
map.removeOverlay(geoXml); //Remove overlays
geoXml = new GGeoXml(URLToKML + "?rand="+(new Date()).valueOf() ); //rand is used to trick google maps into thinking this is a new KML (don't use cache version)
map.addOverlay(geoXml); //Add the new data from the newly generated KML
在V3版本中做到这一点。
updateHTML(resp); // This calls the updateHTML function if there is info returned
}
//remove layer
window.nyLayer.setMap(null);
//change its url so that we would force the google to refetch data
window.nyLayer.url = URLToKML + "?rand="+(new Date()).valueOf();
//and re-add layer
window.nyLayer.setMap(window.map);
}
}
xmlhttp.send(null);
map.removeOverlay 和 map.addOverlay 在 V3 中已被贬值，所以我花了一些时间才找到替代品。
关于javascript - 刷新 Google map V3 中的 KML 数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17532345/