保存并加载jsPlumb流程图,包括精确的锚点和连接

这是我正在构建的流程图编辑器的jsFiddle.

这是使用"添加决策"+"添加任务",连接和移动元素可以轻松创建的示例.

现在是困难的部分:我希望能够保存并加载确切的流程图.为此,我开始在Stackoverflow 上使用类似的线程.

为此,我添加了"保存"和"加载"按钮,用于将流程图导出/导入JSON(在保存后显示在jsFiddle中的textform中 - 相同的textform可用于加载).

该保存功能:

function saveFlowchart(){
            var nodes = []
            $(".node").each(function (idx, elem) {
            var $elem = $(elem);
            var endpoints = jsPlumb.getEndpoints($elem.attr('id'));
            console.log('endpoints of '+$elem.attr('id'));
            console.log(endpoints);
                nodes.push({
                    blockId: $elem.attr('id'),
                    nodetype: $elem.attr('data-nodetype'),
                    positionX: parseInt($elem.css("left"), 10),
                    positionY: parseInt($elem.css("top"), 10)
                });
            });
            var connections = [];
            $.each(jsPlumb.getConnections(), function (idx, connection) {
                connections.push({
                    connectionId: connection.id,
                    pageSourceId: connection.sourceId,
                    pageTargetId: connection.targetId
                });
            });

            var flowChart = {};
            flowChart.nodes = nodes;
            flowChart.connections = connections;
            flowChart.numberOfElements = numberOfElements;

            var flowChartJson = JSON.stringify(flowChart);
            //console.log(flowChartJson);

            $('#jsonOutput').val(flowChartJson);
        }

以上示例生成的JSON:

{ "节点":[{ "BLOCKID": "起始点", "NODETYPE": "起始点", "位X":273, "位置▲":8},{ "BLOCKID": "端点", "NODETYPE":"终点", "位X":310, "位置▲":385},{ "块标识": "taskcontainer1", "NODETYPE": "任务", "位X":381, "位置▲":208},{ "块标识" : "decisioncontainer2", "NODETYPE": "决定", "位X":261, "位置▲":103}], "连接":[{ "的ConnectionId": "con_18", "pageSourceId": "decisioncontainer2"," pageTargetId ":" taskcontainer1 "},{" 的ConnectionId ":" con_25" , "pageSourceId": "taskcontainer1", "pageTargetId": "端点"},{ "的ConnectionId": "con_32", "pageSourceId": "decisioncontainer2" "pageTargetId": "端点"},{ "的ConnectionId": "con_46", "pageSourceId": "起始点", "pageTargetId": "decisioncontainer2"}], "numberOfElements":2}

有了这个,我能够保存元素的位置以及连接的部分信息.这里的加载功能:

function loadFlowchart(){
            var flowChartJson = $('#jsonOutput').val();
            var flowChart = JSON.parse(flowChartJson);
            var nodes = flowChart.nodes;
            $.each(nodes, function( index, elem ) {
                if(elem.nodetype === 'startpoint'){
                    repositionElement('startpoint', elem.positionX, elem.positionY);
                }else if(elem.nodetype === 'endpoint'){
                    repositionElement('endpoint', elem.positionX, elem.positionY);
                }else if(elem.nodetype === 'task'){
                    var id = addTask(elem.blockId);
                    repositionElement(id, elem.positionX, elem.positionY);
                }else if(elem.nodetype === 'decision'){
                    var id = addDecision(elem.blockId);
                    repositionElement(id, elem.positionX, elem.positionY);
                }else{

                }
            });

            var connections = flowChart.connections;
            $.each(connections, function( index, elem ) {
                 var connection1 = jsPlumb.connect({
                    source: elem.pageSourceId,
                    target: elem.pageTargetId,
                    anchors: ["BottomCenter", [0.75, 0, 0, -1]]

                });
            });

            numberOfElements = flowChart.numberOfElements;
        }

但是,锚和连接的确切位置会丢失.同样的例子,删除元素然后加载导出的JSON后的结果:

这并不是一个惊喜,因为我还没有存储信息.但我在这一点上陷入困​​境.

我的问题是:我需要为整个流程图设计存储哪些关于锚点/连接器位置的信息以及如何从(并再次加载)jsPlumb中提取它？