'shiny' Cron Expression Input Widget

A widget for 'shiny' apps to handle schedule expression input, using the 'cron-expression-input' JavaScript component. Note that this does not edit the 'crontab' file, it is just an input element for the schedules. See < https://github.com/DatalabFabriek/shinycroneditor/blob/main/inst/examples/shiny-app.R> for an example implementation.

Edit cron schedules in a nice way, in R Shiny

An R 'shiny' package that creates a htmlwidget for inputting a cron schedule in a nice way. It implements JossyDevers/cron-expression-input, but then for use as a Shiny input element.

Installing

We've submitted this as a package to CRAN, but that process takes some time. For now, install via devtools::install_github():

devtools::install_github("DatalabFabriek/shinycroneditor")

How to use in Shiny

In your UI, add:

shinycroneditor::cronOutput(
  "cronschedule1", 
  label = "Choose your first schedule", 
  language = "en-US")

Then, in your server, render the actual editor:

output$cronschedule1 <- shinycroneditor::renderCron({
  shinycroneditor::cron("0 6 * * *")
})

Now you can simply use the cron schedule anywhere as a regular input variable:

shiny::observe({
  message(input$cronschedule1)
})

Have a look at inst/examples/shiny-app.R for a working example.

License

See LICENSE.md. Feel free to open a pull request or issue!

Want to work for us?

Do you like Shiny and do you live in the Netherlands? Get in touch via datalab.nl. We're always looking for good programmers!