On Mar 13, 12:54 pm, bob <[email protected]> wrote:
> The tooltip is supposed to show the text "I'm [name]", but it's not
> showing anything...

I get a tooltip showing "Device: Owa22. Last speed: 0.6km/h" which is
what is added in function refreshMap().

I think it's not updated to an additional marker showing "I'm..."
because this download
http://fyp.no-ip.info/TrackingThruGoogleMaps/myAjax.jsp?townSelect="";
returns an empty result set.

The problem with "map is null or not an object" is a timing issue. You
are using two google.setOnLoadCallbacks. You should only have one of
those: what currently *should* happen is that the second one
[refreshMap] is honoured, but when that happens, initialize isn't
executed and "map" is null. If the first one is honoured for some
reason, map is set but refreshMap isn't done.

I don't know the internals of setOnLoadCallback. I'd suggest using
window.onload instead:
  window.onload="initialize;refreshMap";

Andrew
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