I can't seem to get my head around this problem:
I've got a map with (a lot of) markers (companies) that come from a generated XML file. Below the map, I want to show a (non-JavaScript-generated) list of all the companies that are displayed on the map. When I would click a company in the list, the map would pan to that specific marker and open an infoWindow. The thing is that I want the map and the list to be two separate things...
What would be the right way to tackle this problem? Thanks! Important is that all markerinfo is dynamic...
function initialize_member_map(lang) {
var map = new google.maps.Map(document.getElementById("large-map-canvas"), {
center: new google.maps.LatLng(50.85034, 4.35171),
zoom: 13,
mapTypeId: 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
downloadUrl("/ajax/member-xml-output.php", function(data) {
var xml = data.responseXML;
var markers = xml.documentElement.getElementsByTagName("marker");
var bounds = new google.maps.LatLngBounds();
for (var i = 0; i < markers.length; i++) {
var company = markers[i].getAttribute("company");
var address = markers[i].getAttribute("address");
var type = markers[i].getAttribute("type");
var uid = markers[i].getAttribute("uid"); // Primary key of company table in MySQL
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
var html = "<b>" + company + "</b> <br/>" + address;
bounds.extend(point);
var marker = new google.maps.Marker({
map: map,
position: point,
uid: uid // Some experiments, wanted to use this to target specific markers...
});
bindInfoWindow(marker, map, infoWindow, html);
}
map.setCenter(bounds.getCenter());
map.fitBounds(bounds);
});
}
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() {}
Following the suggestions by Michal, I've tried the following, but am encountering two problems: my console tells me markers[index].getPosition is not a function and the first item in my list shows to be undefined. Can you please help?
//JavaScript Document
var map;
var markers = new Array();
var company_list;
function initialize_member_map(lang) {
map = new google.maps.Map(document.getElementById("large-map-canvas"), {
center: new google.maps.LatLng(50.85034, 4.35171),
zoom: 13,
mapTypeId: 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
// Change this depending on the name of your PHP file
downloadUrl("/ajax/member-xml-output.php?country=BE", function(data) {
var xml = data.responseXML;
markers = xml.documentElement.getElementsByTagName("marker");
var bounds = new google.maps.LatLngBounds();
for (var i = 0; i < markers.length; i++) {
var company = markers[i].getAttribute("company");
var address = markers[i].getAttribute("address");
var type = markers[i].getAttribute("type");
var uid = markers[i].getAttribute("uid");
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
var html = "<b>" + company + "</b> <br/>" + address;
bounds.extend(point);
var marker = new google.maps.Marker({
map: map,
position: point,
uid: uid
});
bindInfoWindow(marker, map, infoWindow, html);
company_list += "<div onclick=scrollToMarker(" + i + ")>"+company+"</div>";
}
map.setCenter(bounds.getCenter());
map.fitBounds(bounds);
//display company data in html
document.getElementById("company_list").innerHTML = company_list;
});
}
function scrollToMarker(index) {
map.panTo(markers[index].getPosition());
}
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(){
}
You are on the right track. You just need to create a separate global array for your Marker objects and push all created markers to this array. When you write out all your company data to html include a call with the index of the marker executed on click. Below is an example code. I used JSON as my data structure to hold company info instead of XML.
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=yes" />
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Google Maps Scroll to Marker</title>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="width: 900px;height: 600px;"></div>
<div id="companies"></div>
<script type="text/javascript">
var map;
//JSON of company data - equivalent of your XML
companies = {
"data": [
{
"name": "Company 1",
"lat": 42.166,
"lng": -87.848
},
{
"name": "Company 2",
"lat": 41.8358,
"lng": -87.7128
},
{
"name": "Company 3",
"lat": 41.463,
"lng": -88.870
},
{"name":"Company 4",
"lat":41.809, "lng":-87.790}
]
}
//we will use this to store google map Marker objects
var markers=new Array();
function initialize() {
var chicago = new google.maps.LatLng(41.875696,-87.624207);
var myOptions = {
zoom: 9,
center: chicago,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("map_canvas"),
myOptions);
listCompanies();
}
function listCompanies() {
html = ""
//loop through all companies
for (i=0;i<companies.data.length;i++) {
//get the maker postion
lat = companies.data[i].lat
lng = companies.data[i].lng
//add google maps marker
marker = new google.maps.Marker({
map:map,
position: new google.maps.LatLng(lat,lng),
title: companies.data[i].name
})
markers.push(marker);
html += "<div onclick=scrollToMarker(" + i + ")>"+companies.data[i].name+"</div>";
}
//display company data in html
document.getElementById("companies").innerHTML =html;
}
function scrollToMarker(index) {
map.panTo(markers[index].getPosition());
}
</script>
</body>
</html>
Ok I added another solution for you - uising your code. This one uses your bindInfWindow function to bind the DOM (HTML) click event to open info window and scroll to marker. Please note that because you are loading companies dynamically the divs (or some other tags) that hold their names and ids must exist in the DOM BEFORE you start binding events to it - so the first function you need to execute is the one that renders companies HTML (not the map init). Please note I have not tested this one as I do not have your data..
//you must write out company divs first
<body onload="showCompanies()">
<script>
//JavaScript Document
var map;
//this is your text data
var markers = new Array();
//you need to create your company list first as we will be binding dom events to it so it must exist before marekrs are initialized
function showCompanies() {
downloadUrl("/ajax/member-xml-output.php?country=BE", function(data) {
var xml = data.responseXML;
markers = xml.documentElement.getElementsByTagName("marker");
for (var i = 0; i < markers.length; i++) {
var company = markers[i].getAttribute("company");
markerId = "id_"+i;
company_list += "<div id="+markerId+">"+company+"</div>";
}
//display company data in html
document.getElementById("company_list").innerHTML = company_list;
//now you are ready to initialize map
initialize_member_map("lang")
});
}
function initialize_member_map(lang) {
map = new google.maps.Map(document.getElementById("large-map-canvas"), {
center: new google.maps.LatLng(50.85034, 4.35171),
zoom: 13,
mapTypeId: 'roadmap'
});
var xml = data.responseXML;
var bounds = new google.maps.LatLngBounds();
//your company data was read in and is ready to be mapped
for (var i = 0; i < markers.length; i++) {
var infoWindow = new google.maps.InfoWindow;
var company = markers[i].getAttribute("company");
var address = markers[i].getAttribute("address");
var type = markers[i].getAttribute("type");
var uid = markers[i].getAttribute("uid");
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
var html = "<b>" + company + "</b> <br/>" + address;
bounds.extend(point);
var marker = new google.maps.Marker({
map: map,
position: point,
uid: uid
});
//add the new marker object to the gMarkers array
markerId = "id_"+i;
bindInfoWindow(marker, map, infoWindow, html,markerId);
}
map.setCenter(bounds.getCenter());
map.fitBounds(bounds);
}
function scrollToMarker(index) {
map.panTo(markers[index].getPosition());
}
function bindInfoWindow(marker, map, infoWindow, html, markerId) {
google.maps.event.addListener(marker, 'click', function() {
infoWindow.setContent(html);
infoWindow.open(map, marker);
});
//bind onlcick events to the div or other object in html
markerObj = document.getElementById(markerId);
//you can create DOM event listeners for the map
google.maps.event.addDomListener(markerObj, 'click', function() {
infoWindow.setContent(html);
infoWindow.open(map, marker);
map.panTo(marker.getPosition());
});
}
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(){
}
</script>
since i cannot remove this answer, I decided to add some notes!
if your xml format is similar to this: http://www.w3schools.com/dom/books.xml
you may access author nodeValue with following lines.
markers = xml.documentElement.getElementsByTagName("book");
for (var i = 0; i < markers.length; i++) {
authors = markers[i].getElementsByTagName('author')[0].innerHTML;
}
hope it helps someone :)
Related
I am working on a dealerlocator with google maps. The problem is that when I click on a icon the infowindow opens the wrong window. I use a xml import. Everything is going well until the infowindow.
see website https://www.turbho.com/dealerview.php
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyD2maN7CjzWtwI6yuHj8lX078NzV0Ywkg0&sensor=false"></script>
{literal}
<script>
var map;
function initialize() {
var mapOptions = {
zoom: 12,
mapTypeId: 'roadmap'
};
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
// Try HTML5 geolocation
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function (position) {
var pos = new google.maps.LatLng(position.coords.latitude,
position.coords.longitude);
var infowindow = new google.maps.InfoWindow({
map: map,
position: pos,
panControl: true,
zoomControl: true,
scaleControl: true,
content: 'U bent nu hier.'
});
map.setCenter(pos);
}, function () {
handleNoGeolocation(true);
});
} else {
// Browser doesnt support Geolocation
handleNoGeolocation(false);
}
var image = 'https://turbho.com/img/logoturbhogooglesmall.png';
// Change this depending on the name of your PHP file
downloadUrl("xml/datacomplete.xml", 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 zipcode = markers[i].getAttribute("zipcode");
var town = markers[i].getAttribute("town");
var anchor = markers[i].getAttribute("anchor");
var website = markers[i].getAttribute("website");
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
var html = "<span style='font-size:12px;'><b>" +
name + "</b> <br />" +
address + "<br />" +
zipcode + " " + town + "<br /><br />" +
website + "<br /><br />" +
anchor + "</span>";
var marker = new google.maps.Marker({
map: map,
position: point,
icon: image
});
var infowindow = new google.maps.InfoWindow({
content: html
});
google.maps.event.addListener(marker, 'click', function () {
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() {}
function handleNoGeolocation(errorFlag) {
if (errorFlag) {
var content = 'Error: The Geolocation service failed.';
} else {
var content = 'Error: Your browser doesn\'t support geolocation.';
}
var options = {
map: map,
position: new google.maps.LatLng(60, 105),
content: content
};
var infowindow = new google.maps.InfoWindow(options);
map.setCenter(options.position);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
{/literal}
<div id="map-canvas"></div>
The problem is solved. I used a function see below and that worked for me.
function add_marker(latlng, title, box_html, image) {
//create the global instance of infoWindow
if (!window.infowindow) {
window.infowindow = new google.maps.InfoWindow();
}
var marker = new google.maps.Marker({
position: latlng,
map: map,
title: title,
icon: image
});
google.maps.event.addListener(marker, 'click', function () {
infowindow.close();
infowindow.setContent(box_html);
infowindow.open(map, this)
});
return marker;
}
Thanx for the help
Ruud
I have searched and searched for an answer with no luck. I can get the xml data to display fine and it appears that my markers refresh but just wont remove the previous one so they stack up. Any help would be great! I just need to remove the markers before the new ones appear. Thanks!
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
//<![CDATA[
var markersArray = [];
var customIcons = {
restaurant: {
icon: 'pin.png',
shadow: ''
},
bar: {
icon: 'loc1.png',
shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
},
airport: {
icon: 'loc2.png',
shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
}
};
function load() {
var map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(37.0923204, -95.9042496),
zoom: 5,
mapTypeId: 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
// Change this depending on the name of your PHP file
setInterval(function() {
downloadUrl("phpsqlajax_genxmlall.php", function(data) {
var xml = data.responseXML;
var markers = xml.documentElement.getElementsByTagName("marker");
resetMarkers(markersArray)
for (var i = 0; i < markers.length; i++) {
var name = markers[i].getAttribute("name");
var address = markers[i].getAttribute("address");
var amount = markers[i].getAttribute("amount");
var time = markers[i].getAttribute("time");
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 + "<br/>$" + amount + " at " + time;
var icon = customIcons[type] || {};
var marker = new google.maps.Marker({
map: map,
position: point,
icon: icon.icon,
shadow: icon.shadow
});
bindInfoWindow(marker, map, infoWindow, html);
}
});
}, 5000);
}
function resetMarkers(arr){
for (var i=0;i<arr.length; i++){
arr[i].setMap(null);
}
//reset the main marker array for the next call
arr=[];
}
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() {}
//]]>
</script>
</head>
<body onload="load()">
<div id="map" style="width: 1400px; height: 800px"></div>
</body>
The problem is, you are not adding your markers to markerArray, it stays empty, so there is nothing to remove when you call resetMarkers
After creating the marker, add it to markerArray:
var marker = new google.maps.Marker({
map: map,
position: point,
icon: icon.icon,
shadow: icon.shadow
});
markerArray.push(marker);
I have a latitude and longitude field on this project I'm working on. I'm trying to consolidate the need to external information sources and trying to incorporate Google Maps API into this project. I'm a complete n00b to JavaScript and Google Maps API. The goal I have is for you to click a link which opens a new window and displays a Google Map. You then scroll around, zoom, etc. to find what you want, then click, the window closes and the lat/long magically is populated on the original page. I'd also like to have the map display markers for existing ones that have been click from the database. I've been following this https://developers.google.com/maps/articles/phpsqlajax_v3 and have now added Lat/Long fields at the bottom. It's been recommended that I use
google.maps.event.addListener(marker, 'click', function (event) {
document.getElementById("latbox").value = this.getPosition().lat();
document.getElementById("lngbox").value = this.getPosition().lng();
});
But, because I'm a n00b, I have no idea where to put that code to work within the code block from the tutorial:
function load() {
var map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(47.6145, -122.3418),
zoom: 13,
mapTypeId: 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
// Change this depending on the name of your PHP file
downloadUrl("getdata.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
});
bindInfoWindow(marker, map, infoWindow, html);
}
});
}
google.maps.event.addListener(marker, 'click', function (event) {
document.getElementById("latbox").value = this.getPosition().lat();
document.getElementById("lngbox").value = this.getPosition().lng();
});
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() {}
</script>
</head>
<body onload="load()">
<div id="map" style="width: 1024px; height: 800px"></div>
<input type="text" name="latFld" id="latFld" /><br />
<input type="text" name="lngFld" id="lngFld" /><br />
</body>
</html>
I am pretty experienced when it come to php mysql, but javascript has got me scratching my head. I am trying to add google maps to my website to show where picture in my database were taken. I got the static google map to work, but it will only display 37 markers due to the url character limitations. I followed the tutorial at google maps api docs, and i have a map that will display all the coordinates for the images in my database. My problem is that i cannot for the life of me figure out how to get the map to auto center and auto zoom to fit all of my markers. my test website for my map is at maptest. I found this tutorial on how to auto center/zoom my map by no matter where i put his code i get errors. this is the code i have for my map that does not auto zoom/center:
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>Google Maps AJAX + mySQL/PHP Example</title>
<script src="http://maps.google.com/maps/api/js? key=AIzaSyDnMkDkoCHNE7BG4eobjeMJdWWZtdZvzeg&sensor=false"
type="text/javascript"></script>
<script type="text/javascript">
//<![CDATA[
var customIcons = {
restaurant: {
icon: 'http://labs.google.com/ridefinder/images/mm_20_blue.png',
shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
},
bar: {
icon: 'http://labs.google.com/ridefinder/images/mm_20_red.png',
shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
}
};
function load() {
var map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(42.293564,-39.07617),
zoom: 2,
mapTypeId: 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
// Change this depending on the name of your PHP file
downloadUrl("phpsqlajax_genxml3.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/>";
//var icon = customIcons[type] || {};
var marker = new google.maps.Marker({
map: map,
position: point,
//icon: icon.icon,
//shadow: icon.shadow
});
bindInfoWindow(marker, map, infoWindow, html);
}
});
}
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() {}
//]]>
</script>
</head>
<body onload="load()">
<div id="map" style="width: 600px; height: 400px"></div>
</body>
</html>
Tried this?
var fitToMarkers = function(markers) {
var bounds = new google.maps.LatLngBounds();
var length = markers.length;
for (var i = 0; i < length; i++) {
bounds.extend(new google.maps.LatLng(markers[i].lat, markers[i].lng));
map.fitBounds(bounds);
}
};
I've followed the PHP/MYSQL tutorial on Google Maps found here.
I'd like the markers to be updated from the database every 5 seconds or so.
It's my understanding I need to use Ajax to periodicity update the markers, but I'm struggling to understand where to add the function and where to use setTimeout() etc
All the other examples I've found don't really explain what's going on, some helpful guidance would be terrific!
This is my code (Same as Google example with some var changes):
function load() {
var map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(37.80815648152641, 140.95355987548828),
zoom: 13,
mapTypeId: 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
// Change this depending on the name of your PHP file
downloadUrl("nwmxml.php", function(data) {
var xml = data.responseXML;
var markers = xml.documentElement.getElementsByTagName("marker");
for (var i = 0; i < markers.length; i++) {
var host = markers[i].getAttribute("host");
var type = markers[i].getAttribute("active");
var lastupdate = markers[i].getAttribute("lastupdate");
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
var html = "<b>" + "Host: </b>" + host + "<br>" + "<b>Last Updated: </b>" + lastupdate + "<br>";
var icon = customIcons[type] || {};
var marker = new google.maps.Marker({
map: map,
position: point,
icon: icon.icon,
shadow: icon.shadow
});
bindInfoWindow(marker, map, infoWindow, html);
}
});
}
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() {}
I hope somebody can help me!
Please note I have not tested this as I do not have a db with xml handy
First of all you need to split your load() function into a function that initializes the map & loads the markers on domready and a function that you will use later to process the xml & update the map with. This needs to be done so you do not reinitialize the map on every load.
Secondly you need to decide what to do with markers that are already drawn on the map. For that purpose you need to add them to an array as you add them to the map. On second update you have a choice to either redraw the markers (rebuild the array) or simply update the existing array. My example shows the scenario where you simply clear the old markers from the screen (which is simpler).
//global array to store our markers
var markersArray = [];
var map;
function load() {
map = new google.maps.Map(document.getElementById("map"), {
center : new google.maps.LatLng(37.80815648152641, 140.95355987548828),
zoom : 13,
mapTypeId : 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
// your first call to get & process inital data
downloadUrl("nwmxml.php", processXML);
}
function processXML(data) {
var xml = data.responseXML;
var markers = xml.documentElement.getElementsByTagName("marker");
//clear markers before you start drawing new ones
resetMarkers(markersArray)
for(var i = 0; i < markers.length; i++) {
var host = markers[i].getAttribute("host");
var type = markers[i].getAttribute("active");
var lastupdate = markers[i].getAttribute("lastupdate");
var point = new google.maps.LatLng(parseFloat(markers[i].getAttribute("lat")), parseFloat(markers[i].getAttribute("lng")));
var html = "<b>" + "Host: </b>" + host + "<br>" + "<b>Last Updated: </b>" + lastupdate + "<br>";
var icon = customIcons[type] || {};
var marker = new google.maps.Marker({
map : map,
position : point,
icon : icon.icon,
shadow : icon.shadow
});
//store marker object in a new array
markersArray.push(marker);
bindInfoWindow(marker, map, infoWindow, html);
}
// set timeout after you finished processing & displaying the first lot of markers. Rember that requests on the server can take some time to complete. SO you want to make another one
// only when the first one is completed.
setTimeout(function() {
downloadUrl("nwmxml.php", processXML);
}, 5000);
}
//clear existing markers from the map
function resetMarkers(arr){
for (var i=0;i<arr.length; i++){
arr[i].setMap(null);
}
//reset the main marker array for the next call
arr=[];
}
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);
}
setInterval(function() {
downloadUrl("conection/cargar_tecnicos.php", function(data) {
var xml = data.responseXML;
markers = xml.documentElement.getElementsByTagName("marker");
removeAllMarkers();
for (var i = 0; i < markers.length; i++) {
var name = markers[i].getAttribute("name");
var fecha = markers[i].getAttribute("fecha");
var id_android = markers[i].getAttribute("id_android");
var celular = markers[i].getAttribute("celular");
var id = markers[i].getAttribute("id");
var logo = markers[i].getAttribute("logo");
var type = markers[i].getAttribute("type");
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
var html = "<div class='infowindow'>"
+"<br/><div style='text-align:center;'><img src="+logo+"><br/>"
+"<b>" + name + "</b></div><br/>"
+"<br/><label><b>Celular:</b></label>" + celular+""
+"<br/><label><b>Id Android:</b></label>" + id_android+""
+"<br/><label><b>Fecha y Hora:</b></label>" + fecha+""
+"<br/><br/><div style='text-align:center;'><a><input style=';' id='pop' type='image' value='"+id+"' class='ASD' img src='img/vermas.png' title='Detalles'/></a></div></div>";
var icon = customIcons[type] || {};
marker[i] = new google.maps.Marker({
position: point,
icon: icon.icon,
shadow: icon.shadow,
title:name
});
openInfoWindow(marker[i], map, infoWindow, html);
marker[i].setMap(map);
}
});
},10000);
}
function removeAllMarkers(){// removes all markers from map
for( var i = 0; i < marker.length; i++ ){
marker[i].setMap(null);
}
}