[mapserver-users] Shape ID in FILTER/CLASS EXPRESSION?
steve.lime at dnr.state.mn.us
Mon Dec 17 10:45:39 EST 2001
3.5 introduces 2 index query modes (INDEXQUERY and INDEXQUERYMAP). You use the cgi parameters shapeindex and tileindex to identify the feature of interest. Tileindex is use when accessing tiled data. You must also define a qlayer.
This feature was added specifically to support instances like you describe, the staged presentation of information.
Data & Applications Manager
500 Lafayette Road
St. Paul, MN 55155
>>> Armin Burger <armin.burger at territoriumonline.com> 12/14/01 17:21 PM >>>
what would be the mode definition for the 'shape by index'? Maybe I can make
use of it.
My intention is to query the attribute data of a layer and show the found
features first in an html table. In one column every found feature has a
zoomed to the extent of this feature and the feature should be somehow
highlighted. But I would like to have this highlight persistant during zooms
etc. until I switch it off.
With the normal querymap this does not work. So I used your suggestion with
an additional query-highlight-layer whose filter/class expressions are set
via the url to show only the requested records. For the zoom/highlight to a
Otherwise I had to create a unique ID in the data or use a field that could
serve as that. At the moment I'm highlighting all found features
simultaneously and the link does only the zooming to the feature extent.
I added this 'Shape ID' feature request to the bugzilla.
> No there isn't, but there could be I think. Could you add that to bugzilla
> on the main site as a feature request. Note that there IS a special query
> mode for retrieving shapes by index. Let me know if you want details...
> Stephen Lime
> Data & Applications Manager
> Minnesota DNR
> 500 Lafayette Road
> St. Paul, MN 55155
>>>> Armin Burger <armin.burger at territoriumonline.com> 12/13/01 12:02PM >>>
> my question was, if there's an expression for the *internal* ID of a
> shapefile that I can use for the class/filteritem, just like the [shpidx]
> for templates. I.e., an item that is no standard visible field of the
> attribute table. [shpidx] does just that, but it is the expression for the
> templates, and will not work as class/filteritem.
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