Tips for labeling subplots in PLOTLY JS

Looking for some guidance on adding titles to plots in Plotly JS. I've checked out the documentation but couldn't find anything helpful. Any tips or suggestions would be greatly appreciated!

Answer №1

Currently, directly setting the subplot title is not possible. However, you can set the subplot title using annotation text.

Here is an example

//Set annotations text in layout configuration
annotations: [{
        text: "First subplot",
          font: {
          size: 16,
           color: 'green',
        },
        showarrow: false,
        align: 'center',
        x: 0.13, //position in x domain
        y: 1, //position in y domain
        xref: 'paper',
        yref: 'paper',
      },
        {
          text: "Second subplot",
          font: {
          size: 16,
          color: 'orange',
        },
        showarrow: false,
        align: 'center',
        x: 0.9, //position in x domain
        y: 1,  // position in y domain
        xref: 'paper',
        yref: 'paper',
        }
      ]

Annotation text plotly.js

Answer №2

Have you seen the feature request over on GitHub? A user named nicolaskruchten shared a workaround in the discussion: https://github.com/plotly/plotly.js/issues/2746#issuecomment-810195118. This method involves using annotations that reference the axes domains for proper positioning relative to the subplot, ensuring the annotation remains fixed even when zooming.

To implement this workaround, define a domain on the axis where you want to position the title. This domain represents the "share" of the entire Plotly canvas that the axis takes up:

    layout: {
      xaxis: { 
        domain: [0, 0.48],
      },
      xaxis2: {
        domain: [0.52, 1],
      }
     }

Then, the annotation itself can reference the domain on this (or both) axes:

  annotations: [
    {
      text: "X1 title",
      x: 0,
      xref: "x domain",
    },
    {
      text: "X2/Y2 title",
      x: 0,
      xref: "x2 domain",
    }
  ]

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