Developing OGC Compliant Web Applications with GeoExt

2. WMS and the GeoExt LayerStore

In GeoExt, map layers, features of vector layers and even the zoom levels of a map are accessible like any remote Ext JS data source. Read by an Ext.data.DataReader, data records are made available to an Ext.data.Store. Depending on the Reader used, not only OpenLayers objects, but also remote OGC services can be accessed.

This module introduces GeoExt’s WMSCapabilitiesStore, and shows how it can easily be used to populate grids and trees. You will create a grid view of layers from a WMS GetCapabilities request, add a tree view to manage the map panel’s layers, add a legend using WMS GetLegendGraphic, and explore map features with a WMS GetFeatureInfo popup.



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