Lazy loading of jquery jstree

The effect is as follows

---

 Using jquery’s jstree component

1. Front-end preparation work

1.1Introducing jstree style and js

<link rel="stylesheet" href="/public/vendor/jstree/jstree.css">
<div id="departmentJstree"></div>
<script src="/public/vendor/jstree/jstree.min.js"></script>

1.2 Write code to implement lazy loading

1.2.1 Configure jstree

// 获取部门树配置参数
    var depTreeOptions = function (type, status) {
        var options = {
            types: {
                default: {
                    icon: 'fa-building-o'
                }
            },
            // search: {
            //     show_only_matches: true,
            //     show_only_matches_children: true
            // },
            // types
            plugins: ['core', 'wholerow', 'search'],
            core: {
                check_callback: true,
                // function (obj, callback)
                data: {
                    url(node, callback) {
                        // 后端提供一个接口返回单个数组的
                        return $.configs.ctx + '/biz/project/api/info/tree/fileType'
                    },
                    data: function (node) {
                        console.log(node)
                        let { original } = node;
                        return { ...original, id: node.id };
                    }
                  
                },
                'expand_node': function (node, callback) {
                    var depth = this.get_node(node).parents.length;
                    // 默认展开的层级为 4（包括根节点）
                    if (depth <= 2) {
                        callback();
                    }
                }
            }
        };

        // 渲染批量修改部门树
        if (type === 'modify') {
            options.plugins.push('checkbox');
            options.checkbox = {
                three_state: false
            };
        }

        return options;
    };

1.2.2 Implement tree

$('#departmentJstree').jstree(depTreeOptions('display', status))
                    .on('ready.jstree', function () {
                        // 加载完做的事，针对个人业务的。
                        depTree = $(this).jstree(true);
                        // depTree.open_all();
                        console.log(that)
                        // page.load.dataTable();
                        // that.oTable.ajax.reload();
                        // 重新加载
                        // that.dataTable();
                        // that.load.dataTable();
                    })
                    .on('select_node.jstree', function () {
                        // 点击重新加载右侧的数据。
                        // 如果选了是文件类型的 上传附件要出来
                        if (depTree) {
                            var node = depTree.get_selected(true)[0];
                            if (node) {
                                treeId = node.original.id;
                                treeType = node.original.type;
                                treeParentd = node.original.dataId;
                            }
                            console.log(node)

                            if ('04' == treeType) {
                                $("#upload-file").show();
                            } else {
                                $("#upload-file").hide();
                            }
                        } else {
                            $("#upload-file").hide();
                        }

                        // 重载成员信息
                        that.oTable.ajax.reload();
                        // 更新全选按钮状态
                        $('#lockDataTable')
                            .find('.selectable-all')
                            .prop('checked', false);
                    });

2. Backend work

2.1 Write the /biz/project/api/info/tree/fileType interface. The returned data format is a single array. Children returns true and false types.