这是我正在构建的流程图编辑器的jsFiddle。
这是一个使用"Add Decision“+ "Add Task”连接和移动元素可以轻松创建的示例。
现在最难的部分是:我希望能够保存和加载确切的流程图。为此,我从Stackoverflow这里的一个similar thread开始。
为此,我添加了“保存”和“加载”按钮,用于将流程图导出到JSON或从JSON导入流程图(保存后以文本形式显示在jsFiddle中-可以使用相同的文本形式进行加载)。
保存函数
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);
}
上面示例的JSON结果:
{"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”:“”,“pageSourceId”:“起点”,"pageTargetId":"decisioncontainer2"},"numberOfElements":2}
这样,我就可以保存元素的位置以及连接的部分信息。这里是加载函数
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:
这并不是一个很大的惊喜,因为我还没有存储信息。但是我被困在这一点上了。
我的问题是:我需要为整个流程图设计存储有关锚/连接器位置的哪些信息,以及如何从jsPlumb中提取(&再次加载)这些信息?
https://stackoverflow.com/questions/20620719
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