树组件——jstree使用

本文记录的只是我自己当时的代码，每行的注释很清楚了，你自己可以做相应变通

一、使用前提：

1、下载jstree依赖包

2、相关页面引入样式["jstree/themes/default/style.css"]、js["jstree/jstree.js"]

3、页面声明一个空div  <div id="sortTree"></div>

二、对应的代码

1、树的初始化及相关的操作

$(function () {
    /**
     * 该树分为三层为  --项目
     *                  --项目文档分类
     *                    --分类下具体文档
     * 即项目在1级、文档分类在2级、文档在3级
     */
        //项目的上下文，在上面提到的页面中
    var contextPath = $('#contextPath').val();
    //树的当前操作节点级别（实际上就是树的1级或2级或其他）
    var beforeLevel = null;
    //树的目标操作节点级别
    var targetLevel = null;
    //节点拖动的目标地址位置下标
    var targetPosition = null;
    //页面中树div的dom
    var tree = $('#sortTree');
    //树的初始化
    tree.on('move_node.jstree', function (event, data) { //以下是节点的移动事件要触发的操作
        var targetId = data.parent;
        var sourceId = data.node.id;
        targetPosition = data.position;
        //分类移动
        if(beforeLevel == 2) {
            $.ajax({
                type: "POST",
                url: contextPath + "/docclassify/move",
                data: {"docClassifyId": sourceId, "helpDocSystemId": targetId, "targetPosition": targetPosition},
                dataType: "json",
                success: function (res) {
                    layer.msg(res.message);
                }
            })
        } else if(beforeLevel == 3) { //文档移动
            $.ajax({
                type: "POST",
                url: contextPath + "/helpDoc/move",
                data: {"helpDocId": sourceId, "docClassifyId": targetId, "targetPosition": targetPosition},
                dataType: "json",
                success: function (res) {
                    layer.msg(res.message);
                }
            })
        }
    }).jstree({
        "core":{ //树的事件方法回调
            "check_callback": function (op, node, parent) {
                beforeLevel = $('#'+node.id).attr("aria-level");
                targetLevel = $('#'+parent.id).attr("aria-level");
                if(beforeLevel == 3 && targetLevel == 1) { //文档不能直接移到项目下
                    layer.msg("文档需要移动到分类");
                    return false;
                } else if(beforeLevel == 3 && targetLevel == 3) { // 文档不能移到文档
                    return false;
                } else if(beforeLevel == 2 && targetLevel == 2) { // 分类不能移到分类
                    return false;
                } else if(beforeLevel == 2 && targetLevel == 3) { // 分类不能移到文档
                    return false;
                } else if(beforeLevel == 1 ) { //我这边遇到的问题就是第1级节点，也就是所有项目节点不能拖动，所以我在下面把项目的排序变为右键点击出现上移下移菜单来处理
                    return false;
                }
            },
            data: function (obj, callback) { //初始化树的第1级数据，即所有有序排列的项目
                var jsonStr = "[]";
                var jsonArray = eval(jsonStr);
                $.ajax({
                    type: "GET",
                    url: contextPath + "/helpdocsystem/initTree",
                    dataType: "json",
                    success: function (res) {
                        var arrays = res.result;
                        for (var i = 0; i < arrays.length; i++) {
                            var arr = {
                                "id": arrays[i].id,
                                "parent": "#",
                                "text": arrays[i].name,
                                "icon": "icon iconfont icon-report-type",
                                "index": arrays[i].index //数据库中的数据排序字段
                            }
                            jsonArray.push(arr);
                        }
                        callback.call(this, jsonArray);
                    }
                });
            }
        },
        "contexmenu": { //右键菜单
            "item": function (node) {
                var temp = {
                    "上移": {
                        "lable": "上移",
                        "action": function () {
                            $.ajax({
                                type: "POST",
                                url: contextPath + "/helpdocsystem/order",
                                data: {"docSystemId": node.id, "moveFlag": 1},
                                dataType: "json",
                                success: function (res) {
                                    layer.msg(res.message);
                                    //刷新树
                                    tree.jstree(true).refresh();
                                }
                            })
                        }
                    },
                    "下移": {
                        "lable": "下移",
                        "action": function () {
                            $.ajax({
                                type: "POST",
                                url: contextPath + "/helpdocsystem/order",
                                data: {"docSystemId": node.id, "moveFlag": 0},
                                dataType: "json",
                                success: function (res) {
                                    layer.msg(res.message);
                                    //刷新树
                                    tree.jstree(true).refresh();
                                }
                            })
                        }
                    }
                };
                var menu = {};
                var level = $('#'+node.id).attr("aria-level");
                //此处限制节点为1级时才允许出现右键菜单
                (level == 1) && (menu = temp);
                return menu;
            }
        },
        "plugins": ["sort", "contextmenu", "dnd", "state"], //依次为排序、右键菜单、拖拽移动、状态组件
        "sort": function (a, b) {
            return a['index'] - b['index'];
        }
    }).bind("select_node.jstree", function (event, data) {
        var instant = data.instance;
        var selectedNode = instant.get_node(data.selected);
        var level = $('#'+selectNode.id).attr("aria-level");
        if(parseInt(level) == 2) { //点击2级节点，加载分类下的文档
            loadHelpDoc(instant, selectedNode);
        }
        if(parseInt(level) == 1) { //点击1级节点，加载项目下的文档分类
            loadDocClassify(instant, selectedNode);
        }
    });

    /**
     * 加载分类下文档
     * @param instant
     * @param selectNode
     */
    function loadHelpDoc(instant, selectedNode) {
        $.ajax({
            type: "GET",
            url: contextPath + "/helpdoc/initTree",
            data: {"docClassifyId": selectedNode.id},
            dataType: "json",
            success: function (res) {
                var data = res.result;
                if(null != data && data.length > 0) {
                    selectedNode.children = [];
                    $.each(data, function (i, item) {
                        var obj = {
                            "id": item.id,
                            "parent": item.parentId,
                            "text": item.name,
                            "icon": "icon iconfont icon-over-task"
                        };
                        instant.create_node(selectedNode, obj, "last"); //创建子节点
                        if($("#"+selectedNode.id).hasClass("jstree-open")){ //打开关闭节点
                            instant.close_node(selectedNode);
                        } else if($("#"+selectedNode.id).hasClass("jstree-closed")) {
                            instant.open_node(selectedNode);
                        }
                    });
                }
            }
        })
    }

    /**
     * 加载项目下文档分类
     * @param instant
     * @param selectNode
     */
    function loadDocClassify(instant, selectedNode) {
        $.ajax({
            type: "GET",
            url: contextPath + "/docclassify/initTree",
            data: {"helpDocSystemId": selectedNode.id},
            dataType: "json",
            success: function (res) {
                var data = res.result;
                if(null != data && data.length > 0) {
                    selectedNode.children = [];
                    $.each(data, function (i, item) {
                        var obj = {
                            "id": item.id,
                            "parent": item.parentId,
                            "text": item.name,
                            "icon": "icon iconfont icon-report-type"
                        };
                        instant.create_node(selectedNode, obj, "last"); //创建子节点
                        if($("#"+selectedNode.id).hasClass("jstree-open")){ //打开关闭节点
                            instant.close_node(selectedNode);
                        } else if($("#"+selectedNode.id).hasClass("jstree-closed")) {
                            instant.open_node(selectedNode);
                        }
                    });
                }
            }
        });
    }
});

还是贴一下一个接口排序的例子，当时写的确实有点烦，以免以后会忘；initTree相关接口就是关联查询出的有序集合，拼接成需要格式数据即可。

在这把排序可以理解成往一个有序的list中的某个位置插入元素，假如插入元素a，i作为目标位置，那么a元素的实际orderNo为list(i-1).getOrderNo() + 1，那么i位置以下的节点orderNo依次为i+1

需要注意的地方：1、目标位置为0时做了处理，a元素实际位置从1开始；2、目标元素的所有下级元素orderNo增加时需要排除目标元素

1、/docclassify/move

@PostMapping("/docclassify/move")
    public String move(DocClassifyVo docClassifyVo, int targetPosition, Model model) {
        try {
            if (StringUtils.isNotEmpty(docClassifyVo.getHelpDocSystemId)) {
                this.docClassifyManager.move(docClassifyVo, targetPosition);
                model.addAttribute("message", "移动成功");
            }
        } catch (Exception e) {
            e.printStackTrace();
            model.addAttribute("message", "移动失败");
        }
        return "json";
    }
public void move(DocClassifyVo docClassifyVo, int targetPosition) {
    DocClassify docClassify = this.docClassifyService.findById(docClassifyVo.getDocClassifyId());
    HelpDocSystem helpDocSystem = new HelpDocSystem();
    helpDocSystem.setHelpDocSystemId(docClassifyVo.getHelpDocSystemId());
    docClassify.setHelpDocSystem(helpDocSystem);
    docClassify.setOrderNo(this.docClassifyService.getMaxOrderByHelpDocSystemId(docClassifyVo.getHelpDocSystemId) + 1);
    this.docClassifyService.update(docClassify);

    //按orderNo升序查询该项目下的所有分类
    DocClassifyQo docClassifyQo = new DocClassifyQo();
    docClassifyQo.setHelpDocSystemId(docClassifyVo.getHelpDocSystemId());
    List<DocClassify> docClassifies = this.docClassifyService.queryPageList(docClassifyQo);
    if(CollectionUtils.isNotEmpty(docClassifies)) {
        for (int i = 0; i < docClassifies.size(); i++) {
            if(docClassifies.get(i).getDocClassifyId().equals(docClassifyVo.getDocClassifyId())) {
                List<DocClassify> batchUpdateList = new ArrayList<>();
                //目标节点上级
                DocClassify upDocClassify = null;
                //目标节点
                DocClassify targetDocClassify = docClassifies.get(i);
                int realTargetPosition = 0;
                int tempTargetPosition = 0;
                if(targetPosition != 0) {
                    upDocClassify = docClassifies.get(targetPosition - 1);
                    tempTargetPosition = upDocClassify.getOrderNo() + 1;
                    realTargetPosition = upDocClassify.getOrderNo() + 1;
                    targetDocClassify.setOrderNo(realTargetPosition);
                } else {
                    upDocClassify = docClassifies.get(targetPosition);
                    //移动到第一个时从1开始计算
                    tempTargetPosition = 1;
                    realTargetPosition = 1;
                    targetDocClassify.setOrderNo(realTargetPosition);
                }
                this.docClassifyService.update(targetDocClassify);
                //目标节点所有下级
                List<DocClassify> afterDocClassifies = this.docClassifyService.queryPageList(docClassifyQo);
                for (int j = targetPosition; j < afterDocClassifies.size(); j++) {
                    if(!afterDocClassifies.get(i).getDocClassifyId().equals(docClassifyVo.getDocClassifyId())) {
                        DocClassify downDocClassify = afterDocClassifies.get(j);
                        downDocClassify.setOrderNo(++tempTargetPosition);
                        batchUpdateList.add(downDocClassify);
                    }
                }
                batchUpdateList.add(targetDocClassify);
                this.docClassifyService.batchUpdate(batchUpdateList);
                break;
            }
        }
    }
    //重新设置orderNo,避免排序次数多了后orderNo不连续
    List<DocClassify> beforeDocClassifies = this.docClassifyService.queryPageList(docClassifyQo);
    List<DocClassify> batchUpdateList = new ArrayList<>();
    if(CollectionUtils.isNotEmpty(beforeDocClassifies)) {
        for (int i = targetPosition; i < beforeDocClassifies.size(); i++) {
            DocClassify sortDocClassify = beforeDocClassifies.get(i);
            downDocClassify.setOrderNo(i+1);
            batchUpdateList.add(sortDocClassify);
        }
        this.docClassifyService.batchUpdate(batchUpdateList);
    }

}

2、/helpdocsystem/order

关于项目排序由于我们采用的是右键上移下移的操作，所以排序的算法也就没那么复杂，上移时moveFlag为1，下移时moveFlag为0。上移时取移动节点的前一个节点(i-1)的orderNo,下移时orderNo则为(i+1)
，互相交换orderNo更新即可

public void order(String docSystemId, int moveFlag) {
        //按orderNo升序查询该所有项目
        HelpDocSystemQo helpDocSystemQo = new HelpDocSystemQo();
        PageList<HelpDocSystemQo> helpDocSystems = this.helpDocSystemService.queryPageList(helpDocSystemQo);
        if(CollectionUtils.isNotEmpty(helpDocSystems)) {
            List<HelpDocSystem> batchUpdateList = new ArrayList<>();
            for (int i = 0; i < helpDocSystems.size(); i++) {
                if(helpDocSystems.get(i).getHelpDocSystemId().equals(docSystemId)) {
                    if(i == 0 && moveFlag == 1) {
                        throw new RuntimeException("到顶了，不能再移动了");
                    }
                    if(i == helpDocSystems.size() - 1 && moveFlag == 0) {
                        throw new RuntimeException("到底了，不能再移动了");
                    }
                    HelpDocSystem sourceHelpDocSystem = helpDocSystems.get(i);
                    HelpDocSystem targetHelpDocSystem = null;
                    if(moveFlag == 1) {
                        targetHelpDocSystem = helpDocSystems.get(i - 1);
                    } else {
                        targetHelpDocSystem = helpDocSystems.get(i + 1);
                    }
                    int sourceOrderNo = sourceHelpDocSystem.getOrderNo();
                    int targetOrderNo = targetHelpDocSystem.getOrderNo();
                    sourceHelpDocSystem.setOrderNo(targetOrderNo);
                    targetHelpDocSystem.setOrderNo(sourceOrderNo);
                    batchUpdateList.add(sourceHelpDocSystem);
                    batchUpdateList.add(targetHelpDocSystem);
                    this.helpDocSystemService.batchUpdate(batchUpdateList);
                }
            }
        }
    }