Put info from google maps InfoWindow into HTML textbox - events

Question

I have a map that has lots of markers pulled from a database. Each one displays an InfoWindow with a placename and the lat and lng of the location. I need to have the placename affiliated with a marker added to and HTML textbox on click. I can't seem to find any tutorials on this. Maybe someone can point me in the right direction. I am trying to learn this on my own so apologies if it is sloppily designed. Thanks for your help in advance.
function load() {
var map = new google.maps.Map(document.getElementById("map_canvas"), {
center: new google.maps.LatLng(41.640078, -102.669433),
zoom: 3,
mapTypeId: 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
downloadUrl("mymap.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/>" + point;
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);
});
}
It needs to go into a simple textbox like this:
<input type = "text" id = "address_box" value = ""/>

Answer 1

To display that data in your HTML text box, change your bindInfoWindow function, add code in there to put the data in the text box:
function bindInfoWindow(marker, map, infoWindow, html, name) {
google.maps.event.addListener(marker, 'click', function() {
infoWindow.setContent(html);
infoWindow.open(map, marker);
document.getElementById("address_box").value = name;
});
}
And add name in to the call to it:
bindInfoWindow(marker, map, infoWindow, html, name);

Answer 2

Do you mean, when the infoWindow opens, you want to display some information into the textbox?
If so, this code might help you(I hope).
var infoWindow = new google.maps.InfoWindow;
var address_box = document.getElementById("address_box");
google.maps.event.addListener(infoWindow, "domready", function() {
address_box.value = infoWindow.get("Content");
});