EXTJS生成下拉列表树_course

求EXTJS生成下拉列表树的方法，当我点击下拉列表时应该调action，从数据库中读表中的信息，应该是一个二级或三级的目录结构，完了之后能封装成json形式，在js中得到数据。 有谁有相关的案例，我现

ExtJs下拉树，选择后如何同时显示父节点和子节点_course

 现在选择只会显示一工班，如何使其显示的是【机电，1号线，一工班】、 网上看的重写树的代码如下,自己不会改动: Ext.ux.TreeCombo = Ext.extend(Ext.form.ComboBox, { constructor: function (cfg) { cfg = cfg || {}; Ext.ux.TreeCombo.superclass.constructor.call(this, Ext.apply({ maxHeight: 300, editable: false, mode: 'local', triggerAction: 'all', rootVisible: false, selectMode: 'all' }, cfg)); }, store: new Ext.data.SimpleStore({ fields: [], data: [[]] }), // 重写onViewClick，使展开树结点是不关闭下拉框 onViewClick: function (doFocus) { var index = this.view.getSelectedIndexes()[0], s = this.store, r = s.getAt(index); if (r) { this.onSelect(r, index); } if (doFocus !== false) { this.el.focus(); } }, tree: null, // 隐藏值 hiddenValue: null, getHiddenValue: function () { return this.hiddenValue; }, getValue: function () { //增加适用性，与原来combo组件一样 return this.hiddenValue; }, setHiddenValue: function (code, dispText) { this.setValue(code); Ext.form.ComboBox.superclass.setValue.call(this, dispText); this.hiddenValue = code; }, initComponent: function () { var _this = this; var tplRandomId = 'deptcombo_' + Math.floor(Math.random() * 1000) + this.tplId; this.tpl = "<div style='height:" + _this.maxHeight + "px' id='" + tplRandomId + "'></div>"; this.tree = new Ext.tree.TreePanel({ border: false, enableDD: false, enableDrag: false, rootVisible: _this.rootVisible || false, autoScroll: true, trackMouseOver: true, height: _this.maxHeight, lines: true, singleExpand: true, root: new Ext.tree.AsyncTreeNode({ id: _this.rootId, text: _this.rootText, iconCls: 'ico-root', expanded: true, leaf: false, border: false, draggable: false, singleClickExpand: false, hide: true }), loader: new Ext.tree.TreeLoader({ nodeParameter: 'ID', requestMethod: 'GET', dataUrl: _this.url }) }); this.tree.on('click', function (node) { if ((_this.selectMode == 'leaf' && node.leaf == true) || _this.selectMode == 'all') { if (_this.fireEvent('beforeselect', _this, node)) { _this.fireEvent('select', _this, node); } } }); this.on('select', function (obj, node) { var dispText = node.text; var code = node.id; obj.setHiddenValue(code, dispText); obj.collapse(); }); this.on('expand', function () { this.tree.render(tplRandomId); }); Ext.ux.TreeCombo.superclass.initComponent.call(this); } }); Ext.reg("treecombo", Ext.ux.TreeCombo); ``` ```

extjs4下拉列树如何实现？急急急。。。求能用的实例_course

extjs4下拉列树如何实现？

web网页下的下拉多选树形选择控件如何实现_course

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