Is there a way to display a node label at the top inside the node?

Question

Is there a way to display a node label at the top inside the node?

1.7k views Asked by Learn AspNet At 24 June 2021 at 18:51

I am creating a graph using cytoscape.js and I have compounded nodes which are inside the parent node. I would like to have the title of the main/parent node at the top of the node but inside the node. Is that possible in cytoscape?

I have tried using using halign and valign. Whenever I use top value, it shows outside the box.

Is there a extension or a plugin that lets us do it?

Example with child node: https://stackblitz.com/edit/cytoscape-call-method-child-efmbaj?file=src%2Fapp%2FstylesheetObject.ts

Original Q&A

There are 2 answers

Stephan T. On 25 June 2021 at 08:46

As you can read here, you can only place labels inside a node with the center option, a good configuration (label inside at the top) requires a margin to be added to your label:

.selector(':parent')
  .css({
    'text-valign': 'center',
    // the next line moves the parents label up to the top of the node and 5px down to create a padding 
    'text-margin-y': function (node) { return -node.height() + 5 }
})

Here is a working example:

var cy = cytoscape({
  container: document.getElementById('cy'),

  style: cytoscape.stylesheet()
    .selector(':parent')
    .css({
      'text-valign': 'center',
      'text-margin-y': function(node) {
        return -node.height() + 5
      }
    })
    .selector('node')
    .css({
      'height': 'data(size)',
      'width': 'data(size)',
      'border-color': '#000',
      'border-width': '1',
      'content': 'data(name)'
    })
    .selector('edge')
    .css({
      'width': 'data(strength)'
    })
    .selector('#1')
    .css({
      'background-color': 'red'
    })
    .selector('#4')
    .css({
      'background-color': 'green'
    }),

  elements: {
    nodes: [{
        data: {
          id: '1',
          size: 50,
          name: 'a'
        }
      },
      {
        data: {
          id: '2',
          size: 20,
          name: 'b',
          parent: '1'
        }
      },
      {
        data: {
          id: '3',
          size: 40,
          name: 'c',
          parent: '1'
        }
      },
      {
        data: {
          id: '4',
          size: 50,
          name: 'd'
        }
      },
      {
        data: {
          id: '5',
          size: 20,
          name: 'e',
          parent: '4'
        }
      },
      {
        data: {
          id: '6',
          size: 40,
          name: 'f',
          parent: '4'
        }
      }
    ],
  },
});

body {
  font: 14px helvetica neue, helvetica, arial, sans-serif;
}

#cy {
  height: 100%;
  width: 75%;
  position: absolute;
  left: 0;
  top: 0;
  float: left;
}

<html>

<head>
  <meta charset=utf-8 />
  <meta name="viewport" content="user-scalable=no, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, minimal-ui">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/cytoscape/3.2.17/cytoscape.min.js"></script>
  <script src="https://unpkg.com/[email protected]/dist/jquery.js"></script>
</head>

<body>
  <div id="cy"></div>
</body>

</html>

**Abhi** · Accepted Answer · 2021-06-30T03:05:25+00:00

What I understand is that you want to put the parent label inside the box above child? apologies if I'm wrong

If so, My solution will be to add a padding and then apply margin for alignment.

Modified your example

Styles updated:

'padding-top':60

selector: 'node',
css: {
  content: 'data(label)',
  'text-valign': 'center',
  'text-halign': 'center',
  'font-size': 28,
  'padding-top':60
}

'text-valign': 'top', and 'text-margin-y': function(node) { return node.height() - 10; }

selector: 'node[type="parent"]',
style: {
  shape: 'rectangle',
  'background-color': 'grey',
  width: 300,
  height: 100,
  'font-size': 25.5,
  'font-family': 'Lato, Helvetica Neue, Helvetica, Arial, sans-serif',
  color: 'black',
  'text-valign': 'top',
  'text-halign': 'center',
  'text-margin-y': function(node) {
    return node.height() - 10;
  }
}

TechQA.

Is there a way to display a node label at the top inside the node?

There are 2 answers

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