[Geomoose-users] multiple layer selection
Fischer, Brian
bfischer at houstonengineeringinc.com
Fri Mar 14 15:59:27 EDT 2008
Lee,
I think this is definetely possible, but it would require some JS code
for sure. I also think it would be easier to do the spatial query for
names via PHP mapscript. So you may also need to write a little PHP
mapscript that takes in the layer name, mapfile name and bounding box
and returns to GeoMOOSE a javascript function that will change your drop
down menu with the new list. The difficult part with this is triggering
that javasript function from your php return.
We did something like this for the mosquito control district where when
they do an address search it will display the results but then
automatically zoom the map to the first results. The only way we could
get this to work was to return an iframe with an onLoad event. See
below:
<iframe src="/zzz.html" onload="Map.zoomToViewString('<?php echo
$firstExtent ?>');" style="position: absolute; width: 0px; height:
0px"/>
Dan my have other ideas, but I think this would work. It would
definetely take me a little playing around to get it to work.
Brian Fischer
Houston Engineering, Inc.
Maple Grove, MN
(763) 493-4522
________________________________
From: Lee Meilleur [mailto:lee.meilleur at gis.leg.mn]
Sent: Friday, March 14, 2008 2:51 PM
To: 'Bob Basques'; Fischer, Brian; geomoose-users at lists.sourceforge.net
Subject: RE: [Geomoose-users] multiple layer selection
What if there were limitations to the number of layers that could be
applied? What I was attempting to accomplish was to add all of the Jump
To features with bounding box coordinates (let's say 3 layers worth) to
the mapbook file, with a unique target value for filtering each of the
layers, as well as a new set of tags for the layers themselves. I
realized some new functions would be needed for the geomoose.js file,
which made me nervous. What I thought I could do was to pass the layer
name to the geomoose.js function, then by using the layer name, the
function would select the appropriate set of feature names/bounding box
coordinates from the mapbook file, using the appropriate filter, and
populate the Jump To drop down. I program more in php than javascript
(I'm a js hack), so thought it might be do-able, but realized quickly I
was in over my head. Was I just chasing my tail here or might this be
possible?
Lee Meilleur
LCC-GIS Office
Minnesota Legislature
100 Rev. Dr. MLK Jr Blvd.
55 State Office Building
St. Paul, MN 55155
651.296.0098 Fax: 651.297.3697
lee.meilleur at gis.leg.mn
http://www.gis.leg.mn <http://www.gis.leg.mn/>
-----Original Message-----
From: Bob Basques [mailto:Bob.Basques at ci.stpaul.mn.us]
Sent: Friday, March 14, 2008 1:32 PM
To: Lee Meilleur; Brian Fischer;
geomoose-users at lists.sourceforge.net
Subject: RE: [Geomoose-users] multiple layer selection
Brian,
It was materializing in my mind the same way. I was wondering
if both the Drop down, and a Tabbed method of display could be could be
implemented. I think it just amounts to abstracting the view of the
Visible catalog via a filter of some sort for choosing, so the same
underlying request code that is present still works, it's just the
options for display that are added to. It also seems like it abstracts
things related to selects a bit better as well.
The dynamic Jump-To menu as a feature has me worried as an idea.
While I think this could be implemented as a service, rather easily,
there will be problems with how to handle display thresholding and such
related to sending down a list that is simply too big for the browser.
You could even make this work with MapServer CGI only by sending the
right extents to the server and using the appropriate Jump-To template
for the output. My biggest problem with it is that there is no easy way
to manage/limit the results that MapServer sends back to the Jump-To
list. I often thought there should be a companion tool with the
GeoMoose distribution, that could generate a Jump-To Drop down list from
any SHP file, possibly even adding in some form of filtering as well.
I'm not sure that a generic (and redistributable) version would be a
good idea, but I can see ways of implementing it.
bobb
>>> "Fischer, Brian" <bfischer at houstonengineeringinc.com> wrote:
Bob,
I agree with this. Although instead of having a seperate tab
for the selectable layers I was thinking if a layer was listed in the
selection service to be selectable then it would appear in a drop down
menu called "Active Layer" right below the "Zoom To" menu. The same
thing could be done with the popup service, if a layer was listed to
have popups it would be listed in a "Popup Layer" drop down menu. The
idea is you can only have one layer active (selectable at a time) and
one layer that has popups on at at time. I think this would be much
more intuitive for the end user. These layers would always remain
active on any navigate command until the user changed them in the drop
down menu. That way you could set the most popular layer as the default
and then they wouldn't even have to change anything on start up and
could start using the popups or select tool right away. If no the
application is not using any popups or select service then these drop
down menus would not appear on the interface. I through this out as an
idea to Dan last week, but haven't got his reaction yet on the level of
effort to make this happen. What do others think about this idea? I'm
mainly thinking about simplying it as much as possible for the end
users.
In particular I'm thinking this makes a lot of sense for
Counties and cities that primarily deal with people using the parcel
layer. This still would not address Lee's needs for a dynamic "Jump To"
menu, but is along the same lines. Just some thoughts on my end and
what I am hearing from my clients.
-Brian
Brian Fischer
Houston Engineering, Inc.
Maple Grove, MN
(763) 493-4522
________________________________
From: Bob Basques [mailto:Bob.Basques at ci.stpaul.mn.us]
Sent: Friday, March 14, 2008 11:28 AM
To: Lee Meilleur; Fischer, Brian;
geomoose-users at lists.sourceforge.net
Subject: Re: [Geomoose-users] multiple layer selection
All,
Some thoughts about this, more from a global perspective . . .
Hmm, this seems like a good idea on the surface, but I seem to
remember trying this idea out at some previous GeoMoose development
version, and there were some capabilities that implementing it
mitigated. In the end, the idea was to use a general associative
method of having the selection controls aligned with the particular
viewable layer.
Now, since this was implemented in it's current fashion, I've
also run into some occasional what-if scenarios that this new idea would
help with, but I managed to get the existing method to work in the end.
Things like having a selection layer that doesn't have a companion
viewable layer, or at least may not be loaded.
It's almost point towards another "TAB" in my mind, at least if
you keep the operational aspects the same as they are now. For example,
if the MapBook defines a selection layer, then the control for that
selection layer would appear under the "Select" Tab, or some such.
With some of the recent discussions around separating out the
user configs from the system configs, I think this new method of
applying the capability of selections in a more generic way has come up
at the right time.
bobb
>>> "Fischer, Brian" <bfischer at houstonengineeringinc.com> wrote:
Lee,
Currently this is not possibly with GeoMOOSE. I'm not sure it
ever will be...it seems like a custom feature. It would also be hard to
program this to handle all situations. With that said you could either
try to customize GeoMOOSE yourself or you could easily find a consultant
that could likely do this customization for a reasonable price. Maybe
the cusomtization could be contributed back to the GeoMOOSE project.
Essentially you would have to write some of your own javascript code so
on the "OnChange" event of the dropdown would have it do something with
the other drop down.
On this note I think I am going to get GeoMOOSE so you can have
an active layer list in a drop down and use that to have users select
which layer is active and selectable. This is different than how
GeoMOOSE currently handles users specifying which layer is selectable.
-Brian
Brian Fischer
Houston Engineering, Inc.
Maple Grove, MN
(763) 493-4522
________________________________
From: geomoose-users-bounces at lists.sourceforge.net
[mailto:geomoose-users-bounces at lists.sourceforge.net] On Behalf Of Lee
Meilleur
Sent: Friday, March 14, 2008 9:52 AM
To: 'geomoose-users at lists.sourceforge.net'
Subject: [Geomoose-users] multiple layer selection
I saw Jay's post on being able to setup an additional layer to
select on. Has anyone been able to setup multiple layers to select on?
I'd like to have a pulldown with multiple layers. As a layer is
selected, the Jump To options would change for the layer selected. A
non-working example of what I'm trying to do can be viewed at:
http://www.gis.leg.mn/geomoose/atlas/
There's a Jump To Layer pulldown with multiple layers. As a
layer is selected, the Jump To list would change accordingly. Any
ideas?
Thanks.
Lee Meilleur
LCC-GIS Office
Minnesota Legislature
100 Rev. Dr. MLK Jr Blvd.
55 State Office Building
St. Paul, MN 55155
651.296.0098 Fax: 651.297.3697
lee.meilleur at gis.leg.mn
http://www.gis.leg.mn <http://www.gis.leg.mn/>
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