javascript Google Maps V3 地理编码和循环标记
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Google Maps V3 geocoding and markers in loop
提问by user657848
I have some problems with my code, I have a list of airports in a sql database, and I want to create markers for each 1 of those airports.
我的代码有一些问题，我在 sql 数据库中有一个机场列表，我想为这些机场中的每一个创建标记。
For the address i got ICAO-codes for each airport, an ICAO is unique for each airport
对于我获得每个机场的 ICAO 代码的地址，每个机场的 ICAO 都是唯一的
I get the data from the Database as array
我从数据库中获取数据作为数组
it's is saved in "temp" with an split function and with the for-loop it get them 1 by 1
它使用 split 函数保存在“temp”中，并且使用 for 循环将它们 1 个 1
Geocoding is not the problem, but I don't know why for the TITLE and the on click event it is always the last one from the array which is used.
地理编码不是问题，但我不知道为什么对于 TITLE 和点击事件，它始终是使用的数组中的最后一个。
here is the page, the last entry in the database is ZBAA.
这是页面，数据库中的最后一个条目是 ZBAA。
And all the markers are placed at the correct location but the title is wrong :s
并且所有标记都放置在正确的位置，但标题错误：s
http://mizar.lte.lu/~pr1011_meteo/projet/cartemonde4.php
http://mizar.lte.lu/~pr1011_meteo/projet/cartemonde4.php
The problem is with "address" i think but i m not sure.
问题出在我认为的“地址”上，但我不确定。
for (var i = 0; i < temp.length; ++i){
var address=temp[i];
geocoder.geocode({ 'address': address}, function(results){
var marker = new google.maps.Marker({
map: map,
position: results[0].geometry.location,
title:address
});
google.maps.event.addListener(marker, 'click', function() {
window.open ('infomonde.php?icao='+address+'&language=fr', 'Informations météo', config='height=400, width=850, toolbar=no, menubar=no, scrollbars=no, resizable=no, location=no, directories=no, status=no')});
});
};
回答by u476945
Here is a JSFiddle Demousing "dummy" addresses and alert to show the correct data associate with each marker:
这是一个JSFiddle 演示，使用“虚拟”地址和警报来显示与每个标记关联的正确数据：
What you have is a typical closure/scope issue within the for loop. To fix the issue use closure to localize the temp[i]variable before passing into geocode and callback function within it:
您所拥有的是 for 循环中的典型闭包/范围问题。要解决此问题，请使用闭包temp[i]在传递到其中的地理编码和回调函数之前对变量进行本地化：
for (var i = 0; i < temp.length; ++i) {
(function(address) {
geocoder.geocode({
'address': address
}, function(results) {
var marker = new google.maps.Marker({
map: map,
position: results[0].geometry.location,
title: address
});
google.maps.event.addListener(marker, 'click', function() {
//alert(address); //use alert to debug address
window.open('infomonde.php?icao=' + address + '&language=fr', 'Informations météo', config = 'height=400, width=850, toolbar=no, menubar=no, scrollbars=no, resizable=no, location=no, directories=no, status=no')
});
});
})(temp[i]); //closure passing in temp[i] and use address within the closure
}
回答by Bonshington
my guess is because
我的猜测是因为
geocoder.geocode({ 'address': address}, function(results){ ... });
callback is execute in same context.
回调在相同的上下文中执行。
try execute marker in same context. the code below is will wait for all geocoder fetched. then parse to marker.
尝试在相同的上下文中执行标记。下面的代码将等待获取的所有地理编码器。然后解析为标记。
var results = {};
var waiting = temp.length;
while(temp.length > 0){
var fetching = temp.pop();
geocoder.geocode(
{ address: fetching},
function(response){
results[fetching] = response[0].geometry.location;
--waiting;
if(waiting == 0) // wait for everything to finish
setMarker();
}
);
}
var setMarker = function(){
for(var element in results){
var marker = new google.maps.Marker({
map: map,
position: results[element],
title: element
});
google.maps.event.addListener(marker, 'click', function() {
window.open ('infomonde.php?icao='+element+'&language=fr', '', 'configs')});
}
}
ps window.open if i'm not mistaken, some browser reject popup title(and might cause unable to open popup). i alway leave blank.
ps window.open 如果我没记错的话，某些浏览器会拒绝弹出标题（并且可能导致无法打开弹出窗口）。我总是留空。
