In your createMarker() you're calling
var catches = new getCatches(sid);
getCatches() is a function, so 'catches' is just a copy of that
function.
You can't print a copy of a function in your infowindow.
If you were to call getCatches() in the conventional way, it still
wouldn't work because you're not taking any account of GDownloadUrl()
being asychronous.
Calling getCatches() would trigger the sending of a GDownloadUrl()
request, but it **does NOT wait for** the data to come back and
returns immediately.
var catches = getCatches(sid);
would result in 'catches' always being null.
Some time later the data would arrive back, but nothing would get done
with it.
You need to adopt a different strategy in building the infowindow.
Perhaps have the marker click listener issue the GDownloadUrl()
directly (when it is clicked) and put the infowindow building code
into the GDownloadUrl's callback function, where the data is actually
available.
function createMarker( ...) {
.....
GEvent.addListener(marker, 'click', function () {
.....
GDownloadUrl(url, function (data, responseCode) {
do things with 'data' to construct 'html'
marker.openInfoWindowHtml(html);
} ); // end of callback function
} ); // end of click listener
} // end of createMarker
http://econym.org.uk/gmap/async.htm
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