Make updateSliderInput work with date/datetimes. Fixes rstudio#904

Author: wch

R/update-input.R

@@ -269,7 +269,39 @@ updateNumericInput <- function(session, inputId, label = NULL, value = NULL,
 #'   )
 #' }
 #' @export
-updateSliderInput <- updateNumericInput
+updateSliderInput <- function(session, inputId, label = NULL, value = NULL,
+  min = NULL, max = NULL, step = NULL)
+{
+  # Make sure that value, min, max all have the same type, because we need
+  # special handling for dates and datetimes.
+  vals <- dropNulls(list(value, min, max))
+
+  type <- unique(lapply(vals, function(x) {
+    if      (inherits(x, "Date"))   "date"
+    else if (inherits(x, "POSIXt")) "datetime"
+    else                            "number"
+  }))
+  if (length(type) > 1) {
+    stop("Type mismatch for value, min, and max")
+  }
+
+  if (type == "date" || type == "datetime") {
+    to_ms <- function(x) 1000 * as.numeric(as.POSIXct(x))
+    if (!is.null(min))   min   <- to_ms(min)
+    if (!is.null(max))   max   <- to_ms(max)
+    if (!is.null(value)) value <- to_ms(value)
+  }
+
+  message <- dropNulls(list(
+    label = label,
+    value = formatNoSci(value),
+    min = formatNoSci(min),
+    max = formatNoSci(max),
+    step = formatNoSci(step)
+  ))
+  session$sendInputMessage(inputId, message)
+}
+
 
 updateInputOptions <- function(session, inputId, label = NULL, choices = NULL,
                                selected = NULL, inline = FALSE,