Google Map API Example question (cht 7, p203)
 

Hello Chris/Licinda
I study your book "Beginng Ajax.
I got stuck in chapter 7, p203 - Google Map API example.

My question is in JavaScript portion.
Below is the part.

function load(e)
{
if (GBrowserIsCompatible())
{
map = new GMap2(document.getElementById("map"));
geocoder = new GClientGeocoder();
placeMarkers(document.getElementById("address").va lue, e);

GDownloadUrl("data.xml", function(data, responseCode) {
var xml = GXml.parse(data);
var markers = xml.documentElement.getElementsByTagName("marker") ;

if (markers.length > 0)
{
point2 = new GLatLng(parseFloat(markers[0].getAttribute("lat")), parseFloat(markers[0].getAttribute("lng")));
map.setCenter(point2, 13);
}
else
{

geocoder.getLatLng("Paris", function(point){map.setCenter(point, 13)});
}
});
}
}

My question is in load function.
It has one argument but at the end, it refers to "point" (in red color) but it is not defined.
That is a part, which bugs me now.

I will appreciate if you can clarify me about this.

Answer to the Google Map API question
 

I serfed googlemap api help section for getLatLng.

The answer to my question was there.
The following is the defintion for the function and description.

getLatLng (addr:string, callback:function)
return: returns nothing
description: Sends a request to Google servers to geocode the specified
address. If the address was successfully located, the
user-specified callback function is invoked with a GLatLng
point. Otherwise, the callback function is given a null point.
In case of ambiguous addresses, only the point for the best
match is passed to the callback function.

So in summary, it is defined by getLatLng function. I hate black box notation but in this case, that is what it is.

Thanks Chris/Lucinda anyway.

Hi Everyone
 

I would like to know if is it possible to call a javascript fuction from the server side. I want to pass the map coordiantes into the google map on the web browser. I am writing my server side code in VB.net. I would like to know if there is any method that I can use to pass the coordinates from the database to the map.

Your assistance will be highly appreciatable.

Thanx