[OpenLayers-Users] Http request?
andrea.maschio at gmail.com
Sat Jan 19 07:16:15 EST 2008
Il giorno 18/gen/08, alle ore 13:02, Christopher Schmidt ha scritto:
> The "X" in AJAX is for XML/XMLHttpRequest. XMLHttpRequest is not
> neccesary to receive tiles -- instead, the proper URL is simply stuck
> into an <img> tag, which (of course) can be loaded from other sites.
Ok, so as I understand except fo wfs-t (that means transactional web
feature service and it's supposed to edit geometries and for this to
interact with the server) all other types of OL visualizations are
based on an image that is generated by the application server and
provided with layer information and other useful visualization stuff
in the xml file generated.
Sorry if it is obvious, but i'm trying to figure out what i need and
if OL covers my purposes. Because I need to select some feature and
then with the information collected by a selection (with the mouse)
dialog with the server to do some operation on data.
Do I need wfs-t for this or maybe is better to collect the data in non
httprequest-way and then treat the data as parameters for a query. I
mean: in wfs-t is there a simpler way to edit data than collecting all
the gids of the features and then building a query with these ids?
> OpenLayers takes as a core tenet: "You can not talk to the server."
> means you can't use XMLHttpRequest to do anything that is crucial to
> functionality unless there is no other way. All configuration, for
> example, is not taken from the WMS GetCapabilities, but is instead
> unfortunate consequence of the Same Origin Policy.
Probably I didn't understood how things go in OL. When I instantiate a
map and then a layer and then add a layer to the map, how goes the
communication with the WFS server?
Please forgive me if I'm asking all these basic information. I'm
checking out the docs, and I'm asking this because the architectural
aspects are far from clear to me now.
Thanks a lot for helping
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