TextWrap for Link Labels

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,
  gridSize: 10,
  async: true,
  sorting: joint.dia.Paper.sorting.APPROX,
  linkPinning: false,
  defaultLink: () => new joint.shapes.standard.Link()
});

// Example

var el1 = new joint.shapes.standard.Rectangle({
  position: {
    x: 10,
    y: 170
  },
  size: {
    width: 100,
    height: 90
  },
  attrs: {
    label: {
      text: 'A'
    }
  }
});
var el2 = new joint.shapes.standard.Rectangle({
  position: {
    x: 450,
    y: 150
  },
  size: {
    width: 100,
    height: 90
  },
  attrs: {
    label: {
      text: 'B'
    }
  }
});

const textMargin = 10;

const l1 = new joint.shapes.standard.Link({
  source: {
    id: el1.id
  },
  target: {
    id: el2.id
  },
  labels: [{
    // custom markup
    size: {
      width: 100,
      height: 40
    },
    markup: [{
      tagName: 'rect',
      selector: 'labelBody'
    }, {
      tagName: 'text',
      selector: 'labelText'
    }],
    attrs: {
      labelText: {
        fill: '#000000',
        fontSize: 14,
        textAnchor: 'middle',
        textVerticalAnchor: 'middle',
        pointerEvents: 'none',
        text: 'Pellentesque imperdiet nunc id nisl hendrerit, sed vulputate tortor varius.',
        textWrap: {
          ellipsis: true
        }
      },
      labelBody: {
        ref: 'labelText',
        fill: '#f0f0f0',
        stroke: 'gray',
        rx: 5,
        ry: 5,
        width: `calc(w + ${2 * textMargin})`,
        height: `calc(h + ${2 * textMargin})`,
        x: `calc(x - ${textMargin})`,
        y: `calc(y - ${textMargin})`
      }
    },
    position: {
      distance: 250
    }
  }, {
    // default markup
    // prefer the custom markup
    size: {
      width: 100,
      height: 40
    },
    attrs: {
 ...