Range Selector • dygraphs

Range Selectors

You can use dyRangeSelector() to add range selector to the bottom of a dygraph() that provides a straightforward interface for panning and zooming. For example:

dygraph(nhtemp, main = "New Haven Temperatures") |>
  dyRangeSelector()

You can also specify an initial date range for the range selector:

dygraph(nhtemp, main = "New Haven Temperatures") |>
  dyRangeSelector(dateWindow = c("1920-01-01", "1960-01-01"))

Note that the dateWindow parameter should be a two-element vector of POSIXct (or objects that can unambiguously converted to POSIXct).

Several other options affect the appearance of the range selector:

dygraph(nhtemp, main = "New Haven Temperatures") |>
  dyRangeSelector(height = 20, strokeColor = "")

Shiny Date Input

Shiny applications can respond to changes in the dateWindow via a special date_window input value. For example, if the output id of a dygraph is series then the current date window can be read from input$series_date_window as an array of two date values (from and to).

Note that when using the data window input variable you should always check for NULL before accessing it, for example:

output$from <- renderText({
  if (!is.null(input$dygraph_date_window))
    strftime(input$dygraph_date_window[[1]], "%d %b %Y")      
})

See the documentation on using dygraphs with Shiny for a more complete example.