extjs自定义下拉树

//创建treeCombox.js
Ext.define('Redm.commons.TreeCombox', {
	extend : 'Ext.form.field.Picker',
	xtype : 'treecombox',
	triggerCls : Ext.baseCSSPrefix + 'form-arrow-trigger',
	config : {
		displayField : null,
		columns : null,
		rootVisible : false,
		selectOnTab : true,
		firstSelected : false,
		maxPickerWidth : 200,
		maxPickerHeight : 360,
		minPickerHeight : 50
	},
	editable : false,
	initComponent : function() {
		var me = this;
		me.callParent(arguments);
		this.addEvents('select');
		me.store.on('load', me.onLoad, me);

	},
	createPicker : function() {
		var me = this, picker = Ext.create('Ext.tree.Panel', {
			id : 'treePicker',
			store : me.store,
			floating : true,
			hidden : true,
			width : me.maxPickerWidth,
			displayField : me.displayField,
			columns : me.columns,
			maxHeight : me.maxTreeHeight,
			shadow : false,
			rootVisible : me.rootVisible,
			manageHeight : false,
			listeners : {
				itemclick : Ext.bind(me.onItemClick, me)
			},
			viewConfig : {
				listeners : {
					render : function(view) {
						view.getEl().on('keypress', me.onPickerKeypress, me);
					}
				}
			}
		}), view = picker.getView();

		view.on('render', me.setPickerViewStyles, me);
		if (Ext.isIE9 && Ext.isStrict) {
			view.on('highlightitem', me.repaintPickerView, me);
			view.on('unhighlightitem', me.repaintPickerView, me);
			view.on('afteritemexpand', me.repaintPickerView, me);
			view.on('afteritemcollapse', me.repaintPickerView, me);
		}
		return picker;
	},
	setPickerViewStyles : function(view) {
		view.getEl().setStyle({
			'min-height' : this.minPickerHeight + 'px',
			'max-height' : this.maxPickerHeight + 'px'
		});
	},
	repaintPickerView : function() {
		var style = this.picker.getView().getEl().dom.style;
		style.display = style.display;
	},
	alignPicker : function() {
		var me = this, picker;

		if (me.isExpanded) {
			picker = me.getPicker();
			if (me.matchFieldWidth) {
				picker.setWidth(this.picker.getWidth());
			}
			if (picker.isFloating()) {
				me.doAlign();
			}
		}
	},
	onItemClick : function(view, record, node, rowIndex, e) {
		this.selectItem(record);
	},
	onPickerKeypress : function(e, el) {
		var key = e.getKey();

		if (key === e.ENTER || (key === e.TAB && this.selectOnTab)) {
			this.selectItem(this.picker.getSelectionModel().getSelection()[0]);
		}
	},
	selectItem : function(record) {
		var me = this;
		me.setValue(record.get(this.valueField));
		me.picker.hide();
		me.inputEl.focus();
		me.fireEvent('select', me, record);
		me.collapse();
	},
	onExpand : function() {
		var me = this, picker = me.picker, store = picker.store, value = me.value;
		if (value) {
			var node = this.picker.getSelectionModel().getSelection()[0];
			if (node)
				picker.selectPath(node.getPath());
		} else {
			var hasOwnProp = me.store.hasOwnProperty('getRootNode');
			if (hasOwnProp)
				picker.getSelectionModel().select(store.getRootNode());
		}

		Ext.defer(function() {
			picker.getView().focus();
		}, 1);

		// 全展开
		picker.expandAll();
	},
	setValue : function(value) {
		var me = this, record;
		me.value = value;
		if (me.store.loading) {
			return me;
		}
		try {
			var hasOwnProp = me.store.hasOwnProperty('getRootNode');
			var recordStore = this.picker.getSelectionModel().getSelection()[0];
			record = value ? recordStore : (hasOwnProp ? me.store.getRootNode() : null);
			me.setRawValue(record ? record.get(this.displayField) : '');
		} catch (e) {
			me.setRawValue('');
		}

		return me;
	},
	getValue : function() {
		return this.value;
	},
	onLoad : function(store, node, records) {
		if (this.firstSelected) {
			if (records && records.length > 0) {
				var record = records[0];
				this.setValue(record.get(this.valueField));
				this.setRawValue(record.get(this.displayField));
			}
		}
//		var value = this.value;
//		//console.log(value);
//		if (value) {
//			this.setValue(value);
//		} else {
//			if (this.firstSelected) {
//				if (records && records.length > 0) {
//					var record = records[0];
//					this.setValue(record.get(this.valueField));
//					this.setRawValue(record.get(this.displayField));
//				}
//			}
//		}
	},
	getSubmitData : function() {
		var me = this, data = null;
		if (!me.disabled && me.submitValue) {
			data = {};
			data[me.getName()] = '' + me.getValue();
		}
		return data;
	},
	onTriggerClick : function() {
		var me = this;
		// me.store.load();
		if (!me.readOnly && !me.disabled) {
			if (me.isExpanded) {
				me.collapse();
			} else {
				me.expand();

			}
			me.inputEl.focus();
		}
	}
});

 引入：

, {
                xtype : 'treecombox',
                id : 'DEPT_CODE_',
                store : empOrgStore,
                queryMode : 'local',
                valueField : 'ORG_CODE_',
                displayField : 'ORG_NAME_',
                forceSelection : true,
                firstSelected : true,
                fieldLabel : '<spring:message code="EXPERT.COM_NAME_" />'
            }