[英]Google Maps V3 (PHP/MYSQL with custome infobox)
我正在使用带有PHP / MSQL的Google Maps,我已经阅读了Google上的文档并从中获取代码。
我想显示类似此示例的自定义框。 除了框内的文本,其他所有内容都可以用我的代码正常运行,我始终始终将文本实际上是数据库中的最后一个条目...如何管理此文本?
var customIcons = {
0: {
icon: 'gif_blue.gif',
shadow: 'gif_blue.gif'
},
1: {
icon: 'gif_green.gif',
shadow: 'gif_green.gif'
}
};
function initialize() {
var map = new google.maps.Map(document.getElementById("map_canvas"), {
center: new google.maps.LatLng(51.5001524, -0.1262362),
zoom: 14,
mapTypeId: 'terrain'
});
// Change this depending on the name of your PHP file
downloadUrl("xml.php", function(data) {
var xml = data.responseXML;
var markers = xml.documentElement.getElementsByTagName("marker");
for (var i = 0; i < markers.length; i++) {
var name = markers[i].getAttribute("name");
var address = markers[i].getAttribute("address");
var type = markers[i].getAttribute("type");
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
//var html = "<b>" + name + "</b> <br/>" + address;
var icon = customIcons[type] || {};
var marker = new google.maps.Marker({
map: map,
position: point,
icon: icon.icon,
shadow: icon.shadow
});
var boxText = document.createElement("div");
boxText.style.cssText = "border: 1px solid black; margin-top: 8px; background: yellow; padding: 5px;";
boxText.innerHTML = "Nom : <b>" + name + "</b> <br/>Adresse :" + address + "</b> <br/>Type :" + type;
var myOptions = {
content: boxText
,disableAutoPan: false
,maxWidth: 0
,pixelOffset: new google.maps.Size(-140, 0)
,zIndex: null
,boxStyle: {
background: "url('tipbox.gif') no-repeat"
,opacity: 0.75
,width: "280px"
}
,closeBoxMargin: "10px 2px 2px 2px"
,closeBoxURL: "http://www.google.com/intl/en_us/mapfiles/close.gif"
,infoBoxClearance: new google.maps.Size(1, 1)
,isHidden: false
,pane: "floatPane"
,enableEventPropagation: false
};
var ib = new InfoBox(myOptions);
//THE PROBLEM SHOULD BE HERE :
google.maps.event.addListener(marker, 'click', (function(marker, i) {
return function() {
ib.open(map, marker);
}
})(marker, i));
}
});
}
function bindInfoWindow(marker, map, infoWindow, html) {
google.maps.event.addListener(marker, 'click', function() {
infoWindow.setContent(html);
infoWindow.open(map, marker);
});
}
function downloadUrl(url, callback) {
var request = window.ActiveXObject ?
new ActiveXObject('Microsoft.XMLHTTP') :
new XMLHttpRequest;
request.onreadystatechange = function() {
if (request.readyState == 4) {
request.onreadystatechange = doNothing;
callback(request, request.status);
}
};
request.open('GET', url, true);
request.send(null);
}
function doNothing() {}
问题是JavaScript 没有块作用域 。 您在此循环中声明的所有变量:
for (var i = 0; i < markers.length; i++) {
/* declarations here */
}
存在于您已定义的匿名回调的范围内( downloadUrl("xml.php", function(data) { /* ... */ }
)。我发现您已尝试通过立即调用函数来解决此问题您评论过,但是没有正确执行。
function initialize() {
var map = new google.maps.Map(document.getElementById("map_canvas"), {
center: new google.maps.LatLng(51.5001524, -0.1262362),
zoom: 14,
mapTypeId: 'terrain'
});
// Change this depending on the name of your PHP file
downloadUrl("xml.php", function(data) {
function createMarker(markerXML) {
var name = markerXML.getAttribute("name"),
address = markerXML.getAttribute("address"),
type = markerXML.getAttribute("type"),
lat = parseFloat(markerXML.getAttribute("lat")),
lng = parseFloat(markerXML.getAttribute("lng")),
icon = customIcons[type] || {},
marker = new google.maps.Marker({
map: map,
position: new google.maps.LatLng(lat, lng),
icon: icon.icon,
shadow: icon.shadow
}),
boxText = document.createElement("div");
boxText.style.cssText = "border: 1px solid black; margin-top: 8px; background: yellow; padding: 5px;";
boxText.innerHTML = "Nom : <b>" + name + "</b> <br/>Adresse :" + address + "</b> <br/>Type :" + type;
var myOptions = {
content: boxText,
disableAutoPan: false,
maxWidth: 0,
pixelOffset: new google.maps.Size(-140, 0),
zIndex: null,
boxStyle: {
background: "url('tipbox.gif') no-repeat",
opacity: 0.75,
width: "280px"
},
closeBoxMargin: "10px 2px 2px 2px",
closeBoxURL: "http://www.google.com/intl/en_us/mapfiles/close.gif",
infoBoxClearance: new google.maps.Size(1, 1),
isHidden: false,
pane: "floatPane",
enableEventPropagation: false
};
var infoBox = new InfoBox(myOptions);
google.maps.event.addListener(marker, 'click', function () {
infoBox.open(map, marker);
}
});
}
var xml = data.responseXML,
markers = xml.documentElement.getElementsByTagName("marker"),
numMarkers = markers.length;
for (var i = 0; i < numMarkers; i++) {
createMarker(markers[i]);
}
});
}
除了一些小的样式和性能调整外,我唯一更改的是:
for
循环中的逻辑分解为一个单独的函数 google.maps.event.addListener
删除无意义的即时函数调用
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