Export visjs network to jpeg/png image

All we need is an easy explanation of the problem, so here it is.

I am working on angular vis.js.
Vis.js works on canvas for creating nodes and links between the nodes.

Is there any way to get the image (jpeg/png) from the visj.s canvas?

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

Take a look on this snippet, i think it will help you

under the vis canvas you will see a PNG image.
you can right click this image and save it.
(or you can save it in any other standard way)

Good Luck.

// create an array with nodes
  var nodes = new vis.DataSet([
    {id: 1, label: 'Node 1'},
    {id: 2, label: 'Node 2'},
    {id: 3, label: 'Node 3'},
    {id: 4, label: 'Node 4'},
    {id: 5, label: 'Node 5'}
  ]);

  // create an array with edges
  var edges = new vis.DataSet([
    {from: 1, to: 3},
    {from: 1, to: 2},
    {from: 2, to: 4},
    {from: 2, to: 5}
  ]);

  // create a network
  var container = document.getElementById('mynetwork');
  var data = {
    nodes: nodes,
    edges: edges
  };
  var options = {};
  var network = new vis.Network(container, data, options);

  network.on("afterDrawing", function (ctx) {
    var dataURL = ctx.canvas.toDataURL();
    document.getElementById('canvasImg').src = dataURL;
  });
#mynetwork {
      width: 600px;
      height: 400px;
      border: 1px solid lightgray;
    }

    p {
      max-width: 600px;
    }
<!doctype html>
<html>
<head>
  <title>Network | Basic usage</title>
  <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/vis/4.20.0/vis.min.js"></script>
  <link href="https://cdnjs.cloudflare.com/ajax/libs/vis/4.20.0/vis.min.css" rel="nofollow noreferrer noopener" rel="stylesheet" type="text/css"/>
</head>
<body>

<div id="mynetwork"></div>
<pre id="eventSpan"></pre>
<img id="canvasImg" alt="Right click to save me!">



</body>
</html>

Method 2

To make it a button:

network.on("afterDrawing", function(ctx) {
  var dataURL = ctx.canvas.toDataURL();
  document.getElementById('canvasImg').href = dataURL;
})
<input type="button" value="Download image" onclick="document.getElementById('canvasImg').click();">
<a id="canvasImg" download="filename"></a>

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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