Untitled

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<link rel="stylesheet" href="joint.css" />
<script src="joint.js"></script>
</head>

<body>
<div id="myholder"></div>
<p>Enter names in the fields, then click "Submit" to submit the form:</p>

<form id="frm1" action="form_action.asp">
  Text: <input type="text" name="content"><br>
  <input type="button" onclick="addButton()" value="Submit">
</form>
<script type="text/javascript">

var graph = new joint.dia.Graph;

var paper = new joint.dia.Paper({
    el: $('#myholder'),
    width: 1000,
    height: 800,
    model: graph,
    gridSize: 1
});

var rect = new joint.shapes.basic.Rect({
    position: { x: 100, y: 30 },
    size: { width: 100, height: 30 },
    attrs: { rect: { fill: 'blue' }, text: { text: 'my box', fill: 'white' } }
});

var rect2 = rect.clone();
rect2.translate(300);

var link = new joint.dia.Link({
    source: { id: rect.id },
    target: { id: rect2.id }
});

graph.addCells([rect, rect2, link]);
function addButton(){
    var rect3 = new joint.shapes.basic.Rect({
    position: { x: 200, y: 50 },
    size: { width: 100, height: 30 },
    attrs: { rect: { fill: 'blue' }, text: { text: "go", fill: 'white' } }
});
    graph.addCell(rect3);
}
</script>
</body>

</html>