do you use persistant query result?
Hello Oliver,
thanks. Everything is working now. After a few test, I found out that
initializeRequest (not handlePreDrawing) needs to be used. Otherwise,
the query plugin will not recognize the changed map object and return
all results. Unfortunately, this causes another side effect: If a query
result exists and the filter is changed, an error is triggered
("Attribute query returned no results") if none of the existing query
results fits the new filter. If at least one result fits the filter, all
are kept.
Do you have any idea, how I could synchronize the query results if the
filter changes?
Regards,
Dirk
Oliver Christen wrote:
see comments below
1. How do I transfer an array of FilterRequest objects? Do I need a
separate class in the common part?
yes, you need to define a class whose structure correspond to your
array of FilterRequest Object
have a look at existing "common" part of existing plugin for example
(outline is a easy one)
2. How should the wsdl for the FilterRequest class look like? Probably
<complexType name="FilterRequest">
<all>
<element name="layerId" type="xsd:string"/>
<element name="filter" type="xsd:string"/>
</all>
</complexType>
you only need the wsdl part if you use cartoweb in Soap mode. If you
use it in direct mode, you can ignore the wsdl.
again, for example, have a look at the outline plugin
But how do I handle the array of requests?
the root element need to be an array, and its children will be of
FilterRequest type
3. Which function on the server side should I use to handle the
request and set the filter strings?
Since you seem to want to set the data of layers on the fly, you must
act before the handleDrawing function. I would do it in the
handlePreDrawing stage.
(see http://www.cartoweb.org/doc/misc/plugins_diagram.pdf)
then it is just a matter of using mapOverlay to set the change you
have passed in your FilterRequests.
And finally a general question:
I would like to prevent that Cartoweb fails and shows an error
message if the provided filter is wrong, e.g. syntax errors. Supposed
a user provides an incorrect filter string, can I somehow test the
filter and ignore it?
a wrong provider will most certainly trigger a mapserver error.
maybe you can catch it in the handlePostDrawing, but im not sure, i
never tried to handle mapserver errors.
regards
Oliver
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