Subplot Grouped Legend

Mix.install([
  {:plotly_ex, "~> 0.3"},
  {:kino, "~> 0.18"}
])

Section

When using subplots, assign the same legendgroup across traces in different subplot axes. Clicking a legend group hides/shows all traces with that group across all subplots simultaneously.

alias Plotly.{Figure, Scatter}

Figure.new()
|> Figure.add_trace(
  Scatter.new(
    x: [1, 2, 3], y: [2, 4, 3],
    name: "Series A",
    mode: "lines",
    legendgroup: "A",
    legendgrouptitle: %{text: "Series A"}
  )
)
|> Figure.add_trace(
  Scatter.new(
    x: [1, 2, 3], y: [4, 2, 5],
    name: "Series B",
    mode: "lines",
    legendgroup: "B",
    legendgrouptitle: %{text: "Series B"}
  )
)
|> Figure.add_trace(
  Scatter.new(
    x: [1, 2, 3], y: [20, 40, 30],
    name: "Series A (subplot)",
    mode: "lines",
    legendgroup: "A",
    showlegend: false,
    xaxis: "x2",
    yaxis: "y2"
  )
)
|> Figure.add_trace(
  Scatter.new(
    x: [1, 2, 3], y: [40, 20, 50],
    name: "Series B (subplot)",
    mode: "lines",
    legendgroup: "B",
    showlegend: false,
    xaxis: "x2",
    yaxis: "y2"
  )
)
|> Figure.update_layout(
  title: "Subplot Grouped Legend",
  xaxis: %{domain: [0, 0.45]},
  xaxis2: %{domain: [0.55, 1]},
  yaxis2: %{anchor: "x2"}
)
|> Plotly.show()