Link Charts for Cross-Selection

A convenience wrapper that sets matching link config on multiple widgets so that brush selections propagate between them. Unlike setLinked, this does not require Crosstalk — it uses a shared group identifier and key column to coordinate selections across charts rendered in the same page.

Usage

linkCharts(..., on, group = NULL, cursor = FALSE, cursorAxis = "x")

Arguments

...

myIO widget objects to link.

on

Character. Column name to match rows across charts.

group

Character. Group identifier. Default auto-generated.

cursor

Logical. When TRUE, a hover in any linked chart draws a synchronized crosshair (and optional tooltip) on every sibling chart in the same group. Default FALSE.

cursorAxis

Character. Which axis to sync: "x" (default), "y", or "xy". Only "x" is active in v1.2; other values are accepted but not yet rendered.

Value

A list of modified myIO widgets with matching link config.

Examples

if (interactive()) {
  w1 <- myIO() |>
    addIoLayer(type = "point", label = "scatter",
      data = mtcars, mapping = list(x_var = "wt", y_var = "mpg"))
  w2 <- myIO() |>
    addIoLayer(type = "bar", label = "bars",
      data = mtcars, mapping = list(x_var = "cyl", y_var = "mpg"))
  linked <- linkCharts(w1, w2, on = "cyl")
}