JSFiddle - React, Tailwind, and code Playground

by Roman Bruckner

HTML

<html>
<head>
    <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/jointjs/3.6.2/joint.css" />
</head>
<body>
      <!-- content -->
      <div id="paper"></div>

      <!-- dependencies -->
        <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.1/jquery.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.20/lodash.min.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.4.0/backbone.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/jointjs/3.6.2/joint.js"></script>
    
    </body>
</html>

JavaScript

var graph = new joint.dia.Graph({}, {
  cellNamespace: joint.shapes
});

const paper = new joint.dia.Paper({
  el: document.getElementById('paper'),
  width: 800,
  height: 900,
  model: graph,
  defaultConnectionPoint: {
    name: 'boundary'
  },
  cellViewNamespace: joint.shapes,
  interactive: {
    labelMove: true
  },
  snapLabels: true,
  gridSize: 10,
  async: true,
  sorting: joint.dia.Paper.sorting.APPROX,
  linkPinning: false,
  defaultLink: () => new joint.shapes.standard.DoubleLink()
});

// Example
 
 
      var line = V("rect", {
        x: 20,
        y:80,
        width: 100,
        height: 100,
        "stroke-width": 3,
        fill: "transparent",
        stroke: "#142f5a",
        name: 'rect1',
      })
      V(paper.viewport).append(line);
      
        let vcircle;
      
        $('svg').on('mouseover', 'rect', function(evt){
            if (vcircle) return;
            const vrect = V(evt.currentTarget);
    	      const bbox = evt.target.getBBox();
            vcircle = V('circle', { r: 10, fill: 'red', cx: bbox.x, cy: bbox.y }).appendTo(paper.viewport);            
            $(vcircle.node).on('click', function() {
              vrect.remove()
              vcircle.remove();
              vcircle = null;
            });
        });