Hover-info module

A server-side helper that formats hover/tooltip content for reactable table cells. Wraps the display value in an htmltools <span> with a title attribute, which browsers render as a native tooltip on hover.

Usage

mod_hoverinfo(
  type = "reactable",
  contents = character(0),
  display = NULL,
  size = NULL,
  style = NULL,
  ...
)

Arguments

type

Back-end to target. Currently only "reactable".

contents

A character string (or named character vector) used as the tooltip text in the title attribute. Named vectors produce "Name: value" pairs joined by " | ".

display

The value to render visibly inside the cell. Passed as the child node of the <span>. Kept as an explicit parameter so it is never accidentally matched to size by positional argument order.

size

CSS font-size for the span wrapper, e.g. "0.8rem". NULL (default) leaves it unchanged.

style

Inline CSS for the span wrapper, e.g. "cursor:help". NULL (default) applies none.

...

Additional HTML attributes passed to the <span> tag.

Value

An htmltools <span> tag with a title attribute set. Use inside a reactable::colDef(cell = ..., html = TRUE) renderer.

Examples

if (FALSE) { # \dontrun{
reactable::colDef(
  name = "Ann. Return (%)",
  html = TRUE,
  cell = function(value, index) {
    mod_hoverinfo(
      type     = "reactable",
      contents = paste0("Annualised log return: ", value, "%"),
      display  = paste0(value, "%"),
      style    = "color:#198754; cursor:help"
    )
  }
)
} # }