[Mapguide-trac] [mapguide-trac] #2439: Fusion exception when selecting point feature

[MapGuide Open Source]

#2439: Fusion exception when selecting point feature
------------------------+---------------------------------------------------
   Reporter:  loureiro  |       Owner:       
       Type:  defect    |      Status:  new  
   Priority:  high      |   Milestone:  2.6  
  Component:  Server    |     Version:  2.5.0
   Severity:  critical  |    Keywords:       
External_id:            |  
------------------------+---------------------------------------------------
 This issue is reproducible on Mapguide 2.6 preview 2: when selecting a
 point feature with a mouse click, a javascript exception is thrown by
 Fusion when clicking a little off the center of the symbol.

 Steps to reproduce:

 1. Load the Sheboygan.mpg from
 http://mapguide.osgeo.org/download/releases/2.0.x-samples.

 2. Create a "Trees" layer for the corresponding SDF data source in the mpg
 and add it to the map (shift it to the top of the drawing order). Edit the
 symbol style and increase the square width/length to 0.15 (this will make
 it easier to reproduce the issue).

 3. Open the "Slate" flexible layout in a browser (e.g., Chrome).

 4. Zoom in until you see the streets. Click right on the center of a tree
 (square symbol) to confirm that it can be selected. Click off center on
 another tree (but still inside the square) to cause a javascript
 exception.

 Error Details:
 Exception occurred in AJAX callback.
 Message: Cannot read property 'length' of undefined
 Location: undefined (undefined)
 Response:
 {"FeatureInformation":{"FeatureSet":[{"@xmlns:xsi":["http://www.w3.org/2001
 /XMLSchema-
 instance"],"@xsi:noNamespaceSchemaLocation":["FeatureSet-1.0.0.xsd"],"Layer":[{"@id
 ":["d96d795e-d05d-
 11e3-8000-f04da2e6c9bb"],"Class":[{"@id":["SHP_Schema:Trees"],"ID":["3ZYAAA=="]}]}]}],"Hyperlink":null,"InlineSelectionImage":null,"SelectedFeatures":[{"SelectedLayer":[{"@id
 ":["d96d795e-d05d-
 11e3-8000-f04da2e6c9bb"],"@name":["Trees"],"LayerMetadata":[{"Property":[{"DisplayName":["ID"],"Name":["ID"],"Type":["9"]}]}]}]}],"Tooltip":null}}

 Stack Trace:
 - ? at http://localhost:8008/mapguide/fusion/lib/fusionSF.js (line: 1990)
 - Object.window.Fusion.ajaxException at
 http://localhost:8008/mapguide/fusion/lib/fusionSF.js (line: 788)
 - ? at http://localhost:8008/mapguide/fusion/lib/fusionSF.js (line: 46592)
 - Object.OpenLayers.Ajax.Request.OpenLayers.Class.dispatchException at
 http://localhost:8008/mapguide/fusion/lib/fusionSF.js (line: 96974)
 - Object.OpenLayers.Ajax.Request.OpenLayers.Class.respondToReadyState at
 http://localhost:8008/mapguide/fusion/lib/fusionSF.js (line: 96923)
 - Object.OpenLayers.Ajax.Request.OpenLayers.Class.onStateChange at
 http://localhost:8008/mapguide/fusion/lib/fusionSF.js (line: 96821)
 - XMLHttpRequest. at http://localhost:8008/mapguide/fusion/lib/fusionSF.js
 (line: 46592)

 The problem happens because the QUERYMAPFEATURES request to the mapguide
 server is returning an incomplete JSON response (no "Feature" field),
 causing the following Fusion code to fail:

 selLayer.Feature.length

-- 
Ticket URL: <https://trac.osgeo.org/mapguide/ticket/2439>
MapGuide Open Source <http://mapguide.osgeo.org/>
MapGuide Open Source Internals