保存并加载jsPlumb流程图，包括精确的锚点和连接 [英] Save and Load jsPlumb flowchart including exact anchors and connections
问题描述
这是我正在构建的流程图编辑器的。
为此，我添加了保存和加载按钮，用于将流程图导出/导入JSON（保存后显示在jsFiddle中的textform中 - 相同textform可用于加载）。
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（'+ $ elem.attr（'id'）的端点）;
console。 log（端点）;
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：
{nodes：[{blockId：startpoint，nodetype：startpoint，positionX：273，positionY：8}， { 块标识： 终点， NODETYPE： 终点， 位X：310， 位置▲：385}，{ 块标识： taskcontainer1， NODETYPE： 任务， 位X ：381， 位置▲：208}，{ BLOCKID： 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}
凭借这一点，我可以保存元素的位置以及部分信息。连接纳秒。
这里的加载函数：
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，锚点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：
由于我还没有存储信息，这并不是一个大惊喜。但我现在陷入困境。
我的问题是：我需要存储哪些关于锚点/连接器位置的信息流程图设计以及我如何从中提取它（并再次加载到它中）jsPlumb？
看到这个JSFiddle 获得解决方案。
您需要按如下方式保存锚点详细信息。这符合此处定义的Anchor表示。注意双嵌套以避免JQuery在地图上自动展平。
$ .each（jsPlumb.getConnections（），function （idx，connection）{
connections.push（{
connectionId：connection.id，
pageSourceId：connection.sourceId，
pageTargetId：connection.targetId，
anchors ：$ .map（connection.endpoints，function（endpoint）{
return [[endpoint.anchor.x，
endpoint.anchor.y，
endpoint.anchor.orientation [0]，
endpoint.anchor.orientation [1]，
endpoint.anchor.offsets [0]，
endpoint.anchor.offsets [1]]];
}）
}）;
}）;
...并加载它们，如下所示：
$ .each（connections，function（index，elem）{
var connection1 = jsPlumb.connect（{
source：elem.pageSourceId，
target：elem.pageTargetId，
anchors：elem.anchors
}）;
}）;
请注意，此解决方案不会保留端点详细信息，包括端点的形状和类型。它只根据您的要求保留锚点详细信息。
This is the jsFiddle of the flowchart editor I am building.
This is an example of what can be easily created with "Add Decision" + "Add Task", connecting and moving the elements.
Now for the hard part: I want to be able to save and load the exact flowchart. For this I got started based with a similar thread here at Stackoverflow.
For this I added the "Save" and "Load" buttons that export/import the flowchart to/from JSON (shown in a textform in the jsFiddle after save - same textform can be used for loading).
The save function:
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);
}
The resulting JSON of the example above:
{"nodes":[{"blockId":"startpoint","nodetype":"startpoint","positionX":273,"positionY":8},{"blockId":"endpoint","nodetype":"endpoint","positionX":310,"positionY":385},{"blockId":"taskcontainer1","nodetype":"task","positionX":381,"positionY":208},{"blockId":"decisioncontainer2","nodetype":"decision","positionX":261,"positionY":103}],"connections":[{"connectionId":"con_18","pageSourceId":"decisioncontainer2","pageTargetId":"taskcontainer1"},{"connectionId":"con_25","pageSourceId":"taskcontainer1","pageTargetId":"endpoint"},{"connectionId":"con_32","pageSourceId":"decisioncontainer2","pageTargetId":"endpoint"},{"connectionId":"con_46","pageSourceId":"startpoint","pageTargetId":"decisioncontainer2"}],"numberOfElements":2}
With that I am able to save the position of the elements as well as part of the information of the connections. Here the load function:
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;
}
However, the exact position of the anchors and connections are lost. Same example again, the result after deleting the elements and then loading the exported JSON:
This comes not as a big surprise as I have not yet stored the information. But I am stuck at this point.
My question is: which information regarding the anchors/connectors position do I need to store for the whole flowchart design and how I can extract it from (& load into it again) jsPlumb?
See this JSFiddle for a solution.
You need to save the anchor details as follows. This conforms to the Anchor representation defined here. Note the double nesting to avoid the JQuery auto-flatten on the map.
$.each(jsPlumb.getConnections(), function (idx, connection) {
connections.push({
connectionId: connection.id,
pageSourceId: connection.sourceId,
pageTargetId: connection.targetId,
anchors: $.map(connection.endpoints, function(endpoint) {
return [[endpoint.anchor.x,
endpoint.anchor.y,
endpoint.anchor.orientation[0],
endpoint.anchor.orientation[1],
endpoint.anchor.offsets[0],
endpoint.anchor.offsets[1]]];
})
});
});
...and load them, as follows:
$.each(connections, function( index, elem ) {
var connection1 = jsPlumb.connect({
source: elem.pageSourceId,
target: elem.pageTargetId,
anchors: elem.anchors
});
});
Note that this solution does not preserve end-point details including the shape and type of end-points. It only preserves the anchor details, as you requested.
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