How to build Connections with Edges in JsPlumb?

Question

How can I set up a JsPlumb connection that splits in the middle and goes to more than one endploints like in the following images?

A: Connecting two endpoints with one connection:

B: Connecting two endpoints with one connection:

C: Connecting three endpoints with one connection:

Edit: Using the FlowChart option I get a strange bug which a small dot, see the image below.

Answer 1

below links to jsfiddle with scripts. All blue-blocks are draggable, so you can experiment with block positions and connections behavior.

And I'm sorry for so large answer ;)

A: Connecting two endpoints with one connection:

http://jsfiddle.net/TkyJB/2/

jsPlumb.ready(function() {

    // default settings for connectors
    var connectionParams = {
        connector: ["Flowchart", {cornerRadius:1}],
        paintStyle:{ 
            lineWidth: 1,
            outlineColor:"blue",
            outlineWidth: 0
        },
        detachable:false,
        endpointStyle: { radius:1 }
    };

    // w2 <=> w1
    jsPlumb.connect({
        source: "window2", 
        target: "window1",
        anchors: ["TopCenter", "Left"]
    }, connectionParams);

    // w2 <=> w2
    jsPlumb.connect({
        source: "window2", 
        target: "window3",
        anchors: ["BottomCenter", "Left"]
    }, connectionParams);

    //
    jsPlumb.draggable(
        jsPlumb.getSelector(".window"),
        { containment:".demo"}
    );
});

B: Connecting two endpoints with one connection:

jsPlumb rule: one connection between 2 windows. So if you need to divide some connection in end, you need to create proxy-point, that will be as source for one widow, and will create 2 new connections for other windows.

http://jsfiddle.net/TkyJB/8/

jsPlumb.ready(function() {

    // default settings for connectors
    var connectionParams = {
        connector: ["Flowchart", {cornerRadius:1}],
        paintStyle:{ 
            lineWidth: 1,
            outlineColor:"green",
            outlineWidth: 0
        },
        detachable:false,
        endpointStyle: { radius:1 }
    };

    // w1 <=> w1s
    jsPlumb.connect({
        source: "window1", 
        target: "window1s",
        anchors: ["Right", "Center"],
        anchor:[ "Perimeter", { shape:"Circle" } ]
    }, connectionParams);

    // w1s <=> w2
    jsPlumb.connect({
        source: "window1s", 
        target: "window2",
        anchors: ["Center", "Bottom"]
    }, connectionParams);

    // w1s <=> w3
    jsPlumb.connect({
        source: "window1s", 
        target: "window3",
        anchors: ["Center", "Top"]
    }, connectionParams);

    //
    jsPlumb.draggable(
        jsPlumb.getSelector(".window"),
        { containment:".demo"}
    );
});

C: Connecting three endpoints with one connection:

It will be the same as in 'B', but with extra hidden proxy-block.

http://jsfiddle.net/TkyJB/7/

jsPlumb.ready(function() {

    // default settings for connectors
    var connectionParams = {
        connector: ["Flowchart", {cornerRadius:1}],
        paintStyle:{ 
            lineWidth: 1,
            outlineColor:"blue",
            outlineWidth: 0
        },
        detachable:false,
        endpointStyle: { radius:1 }
    };

    // w1 <=> w1s1
    jsPlumb.connect({
        source: "window1", 
        target: "window1s1",
        anchors: ["Right", "Center"]
    }, connectionParams);

    // w1s1 <=> w1s2
    jsPlumb.connect({
        source: "window1s1", 
        target: "window1s2",
        anchors: ["Center", "Center"]
    }, connectionParams);

    // w1s1 <=> w2
    jsPlumb.connect({
        source: "window1s1", 
        target: "window2",
        anchors: ["TopCenter", "Left"]
    }, connectionParams);

    // w1s1 <=> w3
    jsPlumb.connect({
        source: "window1s1", 
        target: "window3",
        anchors: ["BottomCenter", "Left"]
    }, connectionParams);

    // w1s2 <=> w4
    jsPlumb.connect({
        source: "window1s2", 
        target: "window4",
        anchors: ["Right", "Left"]
    }, connectionParams);

    //
    jsPlumb.draggable(
        jsPlumb.getSelector(".window"),
        { containment:".demo"}
    );

});