google.maps.InfoWindow - php

Question

i am getting my cordinates from mysql database as shown below
(<?php echo $_Mylat?>, <?php echo $_Mylon?>)
(<?php echo $_Mylat2?>, <?php echo $_Mylon2?>)
When i plot the map, it shows the two points and the direction as shown in the code below
function initialize() {
var mapOptions = {
zoom: 13,
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: center
};
map = new google.maps.Map(document.getElementById('map_canvas'),
mapOptions);
for (var i=0; i<a.length;i++)
{
marker = new google.maps.Marker({
map:map,
draggable:true,
animation: google.maps.Animation.DROP,
position: a[i]
});
}
var flightPlanCoordinates = [
new google.maps.LatLng(<?php echo $_Mylat?>, <?php echo $_Mylon?>),
new google.maps.LatLng(<?php echo $_Mylat2?>, <?php echo $_Mylon2?>)
];
i want a message box to come up when i click or hover on the markers for example but it doesn't work, can someone help me to correct the code
var contentstring = 'hey,this is my location'
var infowindow = new google.maps.InfoWindow ({
content:contentstring
})
google.maps.event.addListener(??????,'click',function(){
infowindow.open(map,????????);});

Answer 1

You have to add a listener and infowindow for each marker (inside the loop), so it should be something like this (not tested):
for (var i=0; i<a.length;i++) {
var marker = new google.maps.Marker({
map:map,
draggable:true,
animation: google.maps.Animation.DROP,
position: a[i]
});
var contentstring = 'hey,this is my location'
var infowindow = new google.maps.InfoWindow({
content: contentString
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.open(map,marker);
});
}
If you only want to have one InfoWindow at a time you should reuse the info window as described here.

Answer 2

Generally infowindows go with markers. When setting the marker, also set the info window and click events.
See the google docs for an example of infowindow usage.
Not sure where you are getting a.length from but I am assuming thats the two points of your flight plan.
for (var i=0; i<a.length;i++)
{
marker = new google.maps.Marker({
map:map,
draggable:true,
animation: google.maps.Animation.DROP,
position: a[i]
});
}
var contentstring = 'hey,this is my location'
var infowindow = new google.maps.InfoWindow ({
content:contentstring
})
google.maps.event.addListener(marker,'click',function(){
infowindow.open(map,marker);
});
}