EXTJS学习系列提高篇:第二十九篇(转载)作者殷良胜,ext2.2打造Ext.form.ComboBox系列--树形结构

本篇介绍了将数据动态绑定到Ext.form.ComboBox,以树状结构的形式显示.采取后台读数据库的方式.提供显示提示消息的效果和改变ComboBox的宽度和高度. 不支持手写和联想功能.

效果图如下:

前台代码如下:

<form id="form1" runat="server">
    <br />
    <div><div id="comboxtree"></div>
    <script type="text/javascript">
    function ready()
    {
        Ext.QuickTips.init();
        var comboTree = new Ext.form.ComboBox
        ({
            store:new Ext.data.SimpleStore({fields:[],data:[[]]}),
            editable:false, //禁止手写及联想功能
            mode: 'local',
            triggerAction:'all',
            frame:true,
            border:true,
            //maxHeight: 300,width:200,
            tpl: '<div id="treePanel" style="height:200px;width:144px;"></div>', //html代码
            selectedClass:'',
            onSelect:function(){alert('good');},           
            autoWidth:true,
            //autoHeight:true,
            emptyText:'请选择...',
            renderTo: 'comboxtree',
            resizable:true
        });
       
        var tree = new Ext.tree.TreePanel
        ({
            title:"树状结构",
            animate:true,
            titleCollapse:true,
            root:root,
            singleExpand:true,
            iconCls:"icon-tree",
            autoLoad:false,
            allowDomMove:true,
            frame:true,
            collapsible:true,
            collapsed:false,
            collapseFirst:true,
            border:false
        });
        var loader=new Ext.tree.TreeLoader({ "treeJson.aspx?Param=1" });
        var root=new Ext.tree.AsyncTreeNode
        ({
         id:"0", 
         leaf:false,
         loader:loader,
         text:"产品类别",
         expandable:true,
         expanded:true 
     });        
        tree.setRootNode(root);       
        comboTree.on('expand',function(){tree.render('treePanel');});
        var tree_click = function(node,e)
        {      
            if(node.attributes.leaf)
            {
                if(node.isLeaf())
                {
                     e.stopEvent();   //非叶子节点则不触发
                }
                comboTree.setValue(node.text);  //设置option值
                comboTree.collapse();   //隐藏option列表
                alert(comboTree.getValue());
            }
        };
        tree.on("click",tree_click);       
    }
    Ext.onReady(ready);
    </script>
    </div>
    </form>

后台代码如下:

protected void Page_Load(object sender, EventArgs e)
        {

            if (Request["node"] == null || Convert.ToString(Request["node"]) == "")
                return;
            List<ExtTreeNode> nodes = new List<ExtTreeNode>();
            string json = "";
            try
            {
                DataSet ds = SampleBusiness.GetMoreRow(Convert.ToString(Request["node"]));
                if (ds != null && ds.Tables[0].Rows.Count > 0)
                {
                    for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                    {
                        DataRow row = ds.Tables[0].Rows[i] as DataRow;
                        ExtTreeNode node = new ExtTreeNode();
                        node.id = Convert.ToString(row["ID"]);
                        node.parentNodeId = Convert.ToString(Request["node"]);
                        node.IsRoot = false;
                        node.leaf = (SampleBusiness.HasChildNode(node.id));
                        node.draggable = true;
                        node.text = Convert.ToString(row["TypeCName"]);
                        node.TypeID = Convert.ToString(row["ID"]);
                        node.PID = Convert.ToString(Request["node"]);
                        node.TypeTitle = Convert.ToString(row["TypeCName"]);
                        node.TypeEName = Convert.ToString(row["TypeCName"]);
                        node.DelFlag = Convert.ToBoolean(row["DelFlag"]);
                        nodes.Add(node);
                    }
                }
                json = JavaScriptConvert.SerializeObject(nodes);
            }
            catch (Exception ee)
            {
                string error = ee.Message;
            }
            Response.Write(json);

        }