GeoExt.tree.LayerLoader

Extends

• Ext.util.Observable

class GeoExt.tree.LayerLoader

A loader that will load all layers of a GeoExt.data.LayerStore By default, only layers that have displayInLayerSwitcher set to true will be included. The childrens’ iconCls defaults to “gx-tree-layer-icon”.

Config Options

Configuration properties in addition to those listed for Ext.util.Observable.

baseAttrs

An object containing attributes to be added to all nodes created by this loader.

filter

Function A function, called in the scope of this loader, with a layer record as argument. Is expected to return true for layers to be loaded, false otherwise. By default, the filter checks for displayInLayerSwitcher:

filter: function(record) {
    return record.getLayer().displayInLayerSwitcher == true
}

store

GeoExt.data.LayerStore The layer store containing layers to be added by this loader.

uiProviders

Object An optional object containing properties which specify custom GeoExt.tree.LayerNodeUI implementations. If the optional uiProvider attribute for child nodes is a string rather than a reference to a TreeNodeUI implementation, then that string value is used as a property name in the uiProviders object. If not provided, the uiProviders object will be taken from the ownerTree’s loader.

Public Methods

Public methods in addition to those listed for Ext.util.Observable.

LayerLoader.createNode()

Parameter:attr – Object attributes for the new node

Override this function for custom TreeNode node implementation, or to modify the attributes at creation time.

Events

Events in addition to those listed for Ext.util.Observable.

beforeload

Triggered before loading children. Return false to avoid loading children.

Listener arguments:

• loader - GeoExt.tree.LayerLoader this loader

• node - Ex.tree.TreeNode the node that this loader is

  configured with

load

Triggered after children wer loaded.

Listener arguments:

• loader - GeoExt.tree.LayerLoader this loader

• node - Ex.tree.TreeNode the node that this loader is

  configured with