zTree的使用

一、节点模糊搜索功能：搜索成功后，自动高亮显示并定位、展开搜索到的节点。

二、节点异步加载：1、点击展开时加载数据；2、选中节点时加载数据。

前台代码如下：

<script type="text/javascript">
    //ztree设置
    var setting = {
        view: {
            fontCss: getFontCss
        },
        check: {
            enable: true
        },
        data: {
            simpleData: {
                enable: true,
                idKey: "id",
                pIdKey: "pId",
                rootPId: 0
            }
        },
        async: {
            enable: true,
            url: "#{getStudentsJsonUrl}",
            autoParam: ["id", "level"]
        },
        callback: {
            beforeCheck: zTreeBeforeCheck,
            onNodeCreated: zTreeOnNodeCreated,
            beforeExpand: zTreeBeforeExpand
        }
    };

    var reloadFlag = false; //是否重新异步请求
    var checkFlag = true; //是否选中

    //节点展开前
    function zTreeBeforeExpand(treeId, treeNode) {
        reloadFlag = false;
        return true;
    };

    //节点创建后
    function zTreeOnNodeCreated(event, treeId, treeNode) {
        var zTree = $.fn.zTree.getZTreeObj(treeId);
        if (reloadFlag) {
            if (checkFlag) {
                zTree.checkNode(treeNode, true, true);
            }
            if (!treeNode.children) {
                zTree.reAsyncChildNodes(treeNode, "refresh");
            }
        }
    };

    //选中节点前
    function zTreeBeforeCheck(treeId, treeNode) {
        var zTree = $.fn.zTree.getZTreeObj(treeId);
        if (!treeNode.children) {
            reloadFlag = true;
            checkFlag = true;
            zTree.reAsyncChildNodes(treeNode, "refresh");
        }
        return true;
    }

    //页面加载完成
    _run(function () {
        require(['zTree/js/jquery.ztree.all-3.5'], function () {
            $.ajax({
                type: "POST",
                url: "#{getStudentsJsonUrl}",
                success: function (data) {
                    if (data && data.length != 0) { //如果结果不为空
                        $.fn.zTree.init($("#tree"), setting, data);
                    }
                    else { //搜索不到结果

                    }
                }
            });
        });

        //提交
        $("#inputSubmit").click(function () {
            var zTree = $.fn.zTree.getZTreeObj("tree");
            var nodes = zTree.getCheckedNodes(true);
            var ids = "";
            var names = "";
            for (var i = 0; i < nodes.length; i++) { //遍历选择的节点集合
                if (!nodes[i].isParent) {
                    ids += nodes[i].id.replace("level" + nodes[i].level, "") + ",";
                    names += nodes[i].name + ",";
                }
            }
            Simpo.ui.box.hideBox();
            parent.$(".boxFrm").contents().find("#inputRange").val(names.substr(0, names.length - 1));
            parent.$(".boxFrm").contents().find("#hidRange").val(ids.substr(0, ids.length - 1));
        })
    });

    //查找节点
    var lastNodeList = [];
    var lastKey;
    function searchNode() {
        var zTree = $.fn.zTree.getZTreeObj("tree");

        var key = $.trim($("#inputSearchNode").val());
        if (key != "" && key != lastKey) {
            nodeList = zTree.getNodesByParamFuzzy("name", key);
            for (var i = 0, l = lastNodeList.length; i < l; i++) { //上次查询的节点集合取消高亮
                lastNodeList[i].highlight = false;
                zTree.updateNode(lastNodeList[i]);
            }
            zTree.expandAll(false); //全部收缩
            if (nodeList.length > 0) {
                for (var i = 0, l = nodeList.length; i < l; i++) { //遍历找到的节点集合
                    if (nodeList[i].getParentNode()) {
                        zTree.expandNode(nodeList[i].getParentNode(), true, false, false); //展开其父节点
                    }
                    nodeList[i].highlight = true;
                    zTree.updateNode(nodeList[i]);
                }
            }
            zTree.refresh(); // 很重要，否则节点状态更新混乱。
            lastNodeList = nodeList;
            lastKey = key;
        }
    }

    //加载数据
    function loadData() {
        var zTree = $.fn.zTree.getZTreeObj("tree");
        var rootNodes = zTree.getNodes();
        reloadFlag = true;
        checkFlag = false;
        for (var i = 0; i < rootNodes.length; i++) {
            if (!rootNodes[i].children) {
                zTree.reAsyncChildNodes(rootNodes[i], "refresh"); //异步加载
            }
        }
    }

    //全部收缩
    function closeAll() {
        var zTree = $.fn.zTree.getZTreeObj("tree");
        if ($("#inputCloseAll").val() == "全部收缩") {
            zTree.expandAll(false);
            $("#inputCloseAll").val("全部展开")
        }
        else {
            zTree.expandAll(true);
            $("#inputCloseAll").val("全部收缩")
        }
    }

    //高亮样式
    function getFontCss(treeId, treeNode) {
        return (treeNode.highlight) ? { color: "#A60000", "font-weight": "bold"} : { color: "#333", "font-weight": "normal" };
    }
</script>

    <div style=" 200px; height: 260px; overflow: auto; border: solid 1px #666;">
        <ul id="tree" class="ztree">
        </ul>
    </div>

后台代码（后台返回Json数据）：

        public void SelStudent()
        {
            set("getStudentsJsonUrl", to(GetStudentsJson));
        }

        public void GetStudentsJson()
        {
            List<Dictionary<string, string>> dicList = new List<Dictionary<string, string>>();

            string level = ctx.Post("level");
            string id = ctx.Post("id");
            if (strUtil.IsNullOrEmpty(id))
            {
                #region 加载班级
                //获取当前登录用户
                Sys_User user = AdminSecurityUtils.GetLoginUser(ctx);
                //获取当前用户关联的老师
                Edu_Teacher teacher = edu_TeacService.FindByUserId(user.Id);
                //获取班级集合
                List<Edu_ClaNameFlow> list = edu_ClaNameFlowService.GetListByTeacherId(teacher.Id);
                foreach (Edu_ClaNameFlow item in list)
                {
                    Dictionary<string, string> dic = new Dictionary<string, string>();
                    dic.Add("id", "level0" + item.Calss.Id.ToString());
                    dic.Add("pId", "0");
                    dic.Add("name", item.Gra.Name + item.Calss.Name);
                    dic.Add("isParent", "true");
                    dicList.Add(dic);
                }
                #endregion
            }
            else
            {
                if (level == "0")
                {
                    //加载学生
                    List<Edu_Student> list = edu_StudService.GetListByClassId(id.Replace("level0", ""));
                    foreach (Edu_Student item in list)
                    {
                        Dictionary<string, string> dic = new Dictionary<string, string>();
                        dic.Add("id", "level1" + item.Id.ToString());
                        dic.Add("pId", id);
                        dic.Add("name", item.Name);
                        dic.Add("isParent", "false");
                        dicList.Add(dic);
                    }
                }
            }

            echoJson(dicList);
        }