Thanks Ben - closures look like just what I need. (I especially liked
your description of the snapshot of the variable value at the time the
call was made).
I've looked at your example, but have unfortunely not been able to
adapt it for .setSearchCompleteCallback.
This is the code so far (ShowTrip is called from a button):
var map;
var localSearch = new GlocalSearch();
var addressArray = new Array("NW3 7EB","WC1X 9ED", "N16 5HZ", "SW19
8PB","NW3 7EB");
var pointsArray = [];
function mapLoad() {
if (GBrowserIsCompatible()) {
map = new GMap2(document.getElementById("map"));
map.addControl(new GLargeMapControl());
map.addControl(new GMapTypeControl());
map.setCenter(new GLatLng(51.529251, -0.126343), 10,
G_HYBRID_MAP);
map.enableScrollWheelZoom();
}
}
function ShowTrip() {
for (address in addressArray) {
localSearch.setSearchCompleteCallback(this, SearchCallback,
[address]);
localSearch.execute(addressArray[address]);
}
}
function SearchCallback(addressnum) {
if (localSearch.results[0]) {
document.getElementById("debug").innerHTML += addressnum; //
at the moment this shows 5 4's
var resultLat = localSearch.results[0].lat;
var resultLng = localSearch.results[0].lng;
pointsArray.push(new GLatLng(resultLat, resultLng));
// above ideally would be: pointsArray[addressnum] = new...
if (pointsArray.length == addressArray.length)
{ GetDirections(); }
// above ideally: if (addressnum == addressArray.length-1)
{ GetDirections(); }
}
else {
alert(address);
}
}
function GetDirections() {
// Displayed Route
gdir = new GDirections(map);
gdir.loadFromWaypoints(pointsArray);
}
If you could show me how to adapt it for closures that would be great!
Many thanks,
Gareth
On Oct 15, 3:22 am, "Ben Lisbakken" <[EMAIL PROTECTED]> wrote:
> Hey Gareth --
> Yeah, code would be best! But it looks like you need the power of closures.
> I wrote a post on this awhile back that was pretty detailed, so I'm going
> to link you to that rather than re-type it. Closures are a bit confusing
> when you first learn them, but hopefully my explanation
> helps:http://groups.google.com/group/Google-AJAX-Search-API/browse_thread/t...
>
> Regards,
> Ben
>
>
>
> On Tue, Oct 14, 2008 at 8:34 AM, GarethE <[EMAIL PROTECTED]> wrote:
>
> > I'm using a GlocalSearch to find the exact lat and lng for an array of
> > addresses and then passing an array of GLatLng from each top result to
> > GDirections (from what I've read this is necessary here in the UK).
>
> > I've been able to loop the array of address and have set up
> > setSearchCompleteCallbacks for each one with a push into an array of
> > GLatLng items created from the lat and lng of the top search result.
>
> > The fun part is of course the callbacks can complete in any order so
> > the directions are often messed up. Is there a way to pass a sequence
> > value from the loop to each callback so the GLatLng items can be put
> > in their array in the same order as the addresses they came from? i.e.
> > the GLatLng created from the top search result of the first address
> > would always go into position 1, second address position 2, etc.
>
> > You can probably tell I'm new to asyncronous programming! - If there's
> > a simpler way to do the same thing I'm all ears.
>
> > Code happily provided on request and thanks in advance.- Hide quoted text -
>
> - Show quoted text -
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