[Users] Migrating MapFish LayerTree to GeoExt LayerTree [SEC=Unclassified]

[Miles Jordan]

If you google for "geoext layertree icon" the first message that comes up is a thread that I started when I was trying to get icons into a layertree myself (only a few weeks ago).

http://www.mail-archive.com/users@geoext.org/msg00392.html

Regards,

Miles

Matt Priour wrote:
> Mark,
>
> The lack of response is likely do to the fact that the customization
> requirements you have are much more difficult to fill with the GeoExt
> layertree than the Mapfish version.
>
> Using the baseParams & filter parameter of the LayerTreeLoader
> configuration object will provide you with most of the functionality
> that you need.
>
> If that fails you can just create the GeoExt LayerNodes directly which
> will accept and respect all the options that normal nodes do in
> addition to a required 'layer' parameter.
>
> It takes some time & effort to understand the options and apply them
> correctly. You very well may have to follow along in the code to
> really get what you want produced.
> I just undertook a similar change to an application and it took me
> about 20 hours to really get it doing what I wanted correctly.
>
> GeoExt has made the normal use cases dead simple and almost effortless
> to use. However for highly customized node by node configurations, one
> must really understand the different GeoExt node types, what options
> they expect & how they behave.
>
> Good Luck, it is knowledge worth having and I don't know if the highly
> customized use cases could be made easier without a custom node type
> or making the simple cases more difficult.
>
> Matt Priour
>
> --------------------------------------------------
> From: "Mark Small" <m.small at ed.ac.uk>
> Sent: Wednesday, July 28, 2010 11:13 AM
> To: <users at geoext.org>
> Subject: [Users] Migrating MapFish LayerTree to GeoExt LayerTree
>
>> Hi there,
>>
>> Sorry for the re-post but I am hoping this may generate a response as I
>> am struggling at the moment.
>>
>> We have an app with a map with multiple layers, containing multiple
>> sub- layers.  With MapFish we generate some json where the layerNames
>> attribute is set to the layer:sub-layer e.g.
>>
>> return [{
>>   text: 'Clear/Select all Layers', leaf: true, layerNames: ['Marine'],
>>   iconCls: 'no-icon', checked: true }, { text: 'Bathymetry &
>>   Elevation', leaf: false, layerNames: ['Marine:57000'], iconCls:
>>   'no-icon', expanded: false, checked: true, children: [{
>>     text: 'Bathymetry',
>>     leaf: true,
>>     layerNames: ['Marine:56500'],
>>     iconCls: 'no-icon',
>>     expanded: false,
>>     checked: true,
>>     children: [{
>>       text: 'Depth Area',
>>       leaf: false,
>>       layerNames: ['Marine:56000'],
>>       iconCls: 'no-icon',
>>       checked: true,
>>       children: [{
>>         text: 'Depth Area Text', leaf: true, layerNames:
>>         ['Marine:55701'], icon: serverUrl +
>>         'legend_icons/bgs625k/2010_625k_bed_APP_46165.png', checked:
>>         true }, { text: 'Undefined Depth', icon: serverUrl +
>>         'legend_icons/bgs625k/2010_625k_bed_APP_46165.png', leaf: true
>>         }, { text: 'Intertidal', icon: serverUrl +
>>         'legend_icons/bgs625k/2010_625k_bed_APP_46165.png', leaf: true
>> ....
>> }];
>>
>> When constructing the map initially we supply it with a number of
>> parameters e.g.
>>
>>  var params = {
>>       transparent: true,
>>       layers: [ 57000, 56500, 56000, 55701 ],
>>       format: 'image/png',
>>       srs: 'EPSG:27700'
>>     };
>>  var layer = new OpenLayers.Layer.WMS("Marine")", urls, params,
>> options);
>>
>> The numbers in the layers attribute correspond to layerNames in the
>> tree model prefixed with the name of the layer e.g. Marine.
>>
>> When the checkbox is clicked on the LayerTree, the map contacts the
>> WMS(s) and gets all the layers with the checkboxes ticked, displaying
>> only the layers the user wants.
>>
>> I have migrated most of our code away from MapFish, this being the
>> last bit, but like I said I'm struggling to see how to do this with
>> GeoExt.  We must get the legend from the server as it gets the data
>> from a database and generates the json string.
>>
>> From the examples in GeoExt I can't see where we can specify a
>> different icon for each leaf node of the tree or tie the node to a
>> sub-layer of the map.
>>
>> Any ideas/examples would be appreciated, thank you.
>>
>>
>>
>> MARK
>>
>> CIAO
>>
>> --
>> The University of Edinburgh is a charitable body, registered in
>> Scotland, with registration number SC005336.
>>
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>>
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Regards,

Miles



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