# GeoExt

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# `GeoExt.tree.LayerParamNode`

Extends
  - Ext.tree.TreeNode

class `GeoExt.tree.``LayerParamNode`

A subclass of `Ext.tree.TreeNode` that represents a value of a list of values provided as one of an `OpenLayers.Layer.HTTPRequest`‘s params. The default iconCls for this node’s icon is “gx-tree-layerparam-icon”.

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

## Config Options

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

`delimiter`
  `String` Delimiter of the `param`‘s value’s items. Default is `,` (comma). If the `param`‘s value is an array, this property has no effect.

`item`
  `String` The param’s value’s item that this node represents.

`layer`
  `OpenLayers.Layer.HTTPRequest|String` The layer that this node represents a subnode of. If provided as string, the string has to match the title of one of the records in the `layerStore`.

`layerStore`
  `GeoExt.data.LayerStore` Only used if layer is provided as string. The store where we can find the layer. If not provided, the store of a map panel found by `GeoExt.MapPanel::guess` will be used.

`param`
  `String` Key for a param (key-value pair in the params object of the layer) that this node represents an item of. The value can either be an `Array` or a `String`, delimited by the character (or string) provided as `delimiter` config option.

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