# GeoExt

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# `GeoExt.tree.LayerNode`

Extends
  - Ext.tree.TreeNode

class `GeoExt.tree.``LayerNode`(config)

  A subclass of `Ext.tree.TreeNode` that is connected to an `OpenLayers.Layer` by setting the node’s layer property. Checking or unchecking the checkbox of this node will directly affect the layer and vice versa. The default iconCls for this node’s icon is “gx-tree-layer-icon”, unless it has children.

  Setting the node’s layer property to a layer name instead of an object will also work. As soon as a layer is found, it will be stored as layer property in the attributes hash.

  The node’s text property defaults to the layer name.

  If the node has a checkedGroup attribute configured, it will be rendered with a radio button instead of the checkbox. The value of the checkedGroup attribute is a string, identifying the options group for the node.

  To use this node type in a `TreePanel` config, set `nodeType` to “gx_layer”.

## Config Options

Configuration properties in addition to those listed for Ext.tree.TreeNode.

`checkedGroup`
  `String` If provided, nodes will be rendered with a radio button instead of a checkbox. All layers represented by nodes with the same checkedGroup are considered mutually exclusive - only one can be visible at a time.

`layer`
  `OpenLayers.Layer or String` The layer that this layer node will be bound to, or the name of the layer (has to match the layer’s name property). If a layer name is provided, `layerStore` also has to be provided.

`layerStore`
  `GeoExt.data.LayerStore` `or "auto"` The layer store containing the layer that this node represents. If set to “auto”, the node will query the ComponentManager for a `GeoExt.MapPanel`, take the first one it finds and take its layer store. This property is only required if `layer` is provided as a string.

`loader`
  `Ext.tree.TreeLoader|Object` If provided, subnodes will be added to this LayerNode. Obviously, only loaders that process an `OpenLayers.Layer` or `GeoExt.data.LayerRecord` (like `GeoExt.tree.LayerParamsLoader`) will actually generate child nodes here. If provided as `Object`, a `GeoExt.tree.LayerParamLoader` instance will be created, with the provided object as configuration.

## Public Properties

Public properties in addition to those listed for Ext.tree.TreeNode.

`LayerNode.``layer`
  `OpenLayers.Layer` The layer this node is bound to.

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