Rounding X and Y Hover Values

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

Section

Use xaxis: %{hoverformat: ".2f"} and yaxis: %{hoverformat: ".2f"} in the layout to control the number of decimal places shown when hovering. The format string uses D3 number formatting syntax (same as tickformat).

alias Plotly.{Figure, Scatter}

Figure.new()
|> Figure.add_trace(
  Scatter.new(
    x: [1.12345, 2.98765, 3.14159],
    y: [10.9999, 20.0001, 15.5555],
    mode: "lines+markers"
  )
)
|> Figure.update_layout(
  title: "Rounded Hover Values",
  xaxis: %{hoverformat: ".2f"},
  yaxis: %{hoverformat: ".2f"}
)
|> Plotly.show()