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              <div id="myholder"></div>
<input type="button" value="debug" id="debug" />
<input type="text" placeholder="New node label" id="new-node-label" />
<input type="button" value="add node" id="add-node" />
<input type="checkbox" id="link" />link
<input type="button" value="init" id="init" />

            
          
!
            
              const graph = new joint.dia.Graph;
graph.on("add", (elm) => {
  console.log("add : " + elm.cid);
});

const paper = new joint.dia.Paper({
  el: document.getElementById("myholder"),
  model: graph,
  width: 400,
  height: 300,
  gridSize: 1,
  drawGrid: true,
  background: {
    color: "rgba(0, 255, 0, 0.3)"
  }});

$("#debug").click(() => {
  console.log(graph);
});

$("#init").click(() => {
  graph.clear();
  init();
});

const colors = ["red", "blue", "black", "orange", "green"];
const selectColor = () => {
  const n = parseInt(Math.random() * Math.floor(colors.length));
  return colors[n];
};

const addNode = (label) => {
  const rect = new joint.shapes.standard.Rectangle();
  const x = Math.random() * 330;
  const y = Math.random() * 220;
  rect.position(x, y);
  rect.resize(100, 40);
  rect.attr({
    body: {
      fill: selectColor()
    },
    label: {
      text: label,
      fill: 'white'
    }
  });
  rect.on('change:position', (rect, position)=> {
    console.log(label, position.x, position.y);
  });
  rect.addTo(graph);
  return rect;
};

const append = () => {
  const label = $("#new-node-label").val();
  if (label != "") {
    addNode(label);
  }
  $("#new-node-label").val("");
};

$("#add-node").click(() => {
  append();
});

$("#new-node-label").keypress((key) => {
  if (key.charCode == 13) {
    append();
  }
});

const addLink = (source, target) => {
  const link = new joint.shapes.standard.Link();
  link.source(source);
  link.target(target);
  link.addTo(graph);
};

let cellViewFrom = null;
let from = null;
let to = null;

paper.on("cell:pointerup", (cellView) => {
  const linkMode = $("#link").prop("checked");
  if (!linkMode) return;
  if (from === null) {
    cellView.highlight();
    cellViewFrom = cellView;
    from = cellView.model;
  } else if (to === null) {
    to = cellView.model;
  }
  if (from && to) {
    addLink(from, to);
    from = null;
    to = null;
    $("#link").prop("checked", false);
    cellViewFrom.unhighlight();
  }
});

const init = () => {
  const rect1 = addNode("Hello");
  const rect2 = addNode("JointJS")
  const rect3 = addNode("World!");
  addLink(rect1, rect2);
  addLink(rect2, rect3);  
};

init();
            
          
!
999px
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