Hey Richard,

2009/12/23 Richard Ulrich <[email protected]>:
> I did some research on the internet. Other people seem to have similar
> problems with javascript libraries that depend on other javascript
> libraries. It has nothing to do with Wt.
> If I remember correctly, the browsers load the script libraries parallel
> and serialize only by host. Because the google maps librariy comes from
> another host than the additional library, the browser thinks it can load
> them both at the same time. There are some lazy loading libraries. But
> combining them with Wt seemed to be difficult.

Interesting. I had always imagined that JavaScript really executes in
the order of declaration. Do you have a link that suggests a
particular solution which you help if it were implemented by Wt itself
?

(btw. Wt does strictly serialize JavaScript loading if you are not
using a progressive bootstrap: it will delay execution of JavaScript
and loading of subsequently inserted JavaScript libraries. So unless
you are using a progressive bootstrap, I am still surprised that this
problem occurs).

> I also tried to extract the relevant parts from the js library and paint
> the svg directly in the widget. But didn't get it to work so far.
>
> So I tried another approach, painting some simple circles as polylines.
> That works as long as I have only one google map on the page. But as
> soon as I have two or three maps on the same page, no polyline overlays
> are displayed at all. That's a different problem though, which I'm going
> to inspect soon.
>
> I thought about using the Wt painting system to draw map overlays, but
> haven't had time to investigate. Would that be feasible?

Definitely, but then you will need to implement the coordinate mapping in C++ ?

Regards,
koen

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