If you are going to be creating valid GeoJSON from geoDjango then just use the
OpenLayers.Format.GeoJSON format reader. If you are just getting JSON with some
non-GeoJSON mix of attributes and geo properties, then you will need to write a
function to parse the output of OpenLayers.Format.JSON into OpenLayers.Feature
objects. The best practice in that case would be to actually sub-class the
OpenLayers.Format.JSON parser into your custom parser, but you could also just
do that function in your application logic.
To handle requests to the server, I would recommend using a
GeoExt.data.FeatureStore with a GeoExt.data.ProtocolProxy created from an
OpenLayers.Layer.Vector with an HTTP protocol. Here is an example:
var vectorLyr = new OpenLayers.Layer.Vector('layer',{
protocol: new OpenLayers.Protocol.HTTP({
url: 'http://myserver.com/geo',
format: new OpenLayers.Format.GeoJSON()
})
});
var featStore = new GeoExt.data.FeatureStore({
fields:['foo',{name:'bar',type:'int'}],
proxy:new GeoExt.data.ProtocolProxy({protocol:vectorLyr.protocol})
});
now you can hook the feature store up to a grid or other data view, etc...
You can use normal Ext.data.Store load methods and options to update the store
or you can go the other way and use an OpenLayers.Strategy within the vector
layer to have it reload itself at appropriate times.
Matt Priour
From: Andrew Parker
Sent: Thursday, February 03, 2011 7:56 AM
To: [email protected]
Subject: [Users] Best way to enter feature properties using a json server
backend?
Hello Mike:
I am planning to do the same thing as you, however, you are a month
ahead of me. My initial plan is to use geodjango to obtain attribute
data from a postGIS database and feed it back to GeoEXT/OpenLayers via JSON.
I do not yet know how to do this but I thought this may give you some
ideas how to proceed. Perhaps we can work together to figure this out?
--
Andrew Parker
Source3 Computing, LLC
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