> wfsProtocol.read ({
> filter:filter,
> callback: processTheQuery,
> scope: strategy
> });
> the (user input text) will be sent to the filter,
To be pedantic, the filter is constructed from user input before the read.
> and if it match any value
> in the DB, that feature will be sent to the processTheQuery func to set the
> new bounds and draw the new selectedLayer with that feature only.
> Do i get it right ?
The "read" will generate a wfs query post to the server. processTheQuery
has to be able to deal with whatever the server will send back. It has
to determined from the response whether there are matching features
returned.
> and if the user insert a wrong value in a search text (which it is not match
> any value in the DB ) , what will happen then ?
You will have features.length of zero in the returned response. I would
strongly recommend you use firebug to examine both what the read
generates and what it returns. You can use tools to manually fiddle with
the POST and see the effect.
> also, selectedLayer has to be a new layer to display the search results
> only. right ?
See earlier posts with the example code, but yes, I create an empty
vector layer where I display results from searching or filtering. This
isnt the only way (eg see
http://openlayers.org/dev/examples/cql-format.js) but it is what works
for me - I am using WMS for display and WFS for query. This structure
lets me use a single procedure (processTheQuery) for both spatial
search, (including a DWITHIN which I use instead of WMSGetFeatureInfo)
and searching by attributes. You needs may be different so study the
filtering examples as well. Also look at the SLDSelect example - if this
works for you, it is fast when have a large number of geometries.
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