R shiny bi-directional reactive widgets

Question

I am struggling to figure out how to get 2 R Shiny widgets to update each other. For example, a slider widget that can update a text box widget, and visa versa, where the en

Answer 1

If you enclose each input slider under a reactive observe, you can achieve your goal. This not only works for two inputs, but for several inputs as well. Let me explain by an example:

observe({
# Create a reactive relationship with slider1
input$slider1
# Update the second slider - slider2
updateTextInput(session, "slider2", NULL, input$slider1)
)}

Similarly for second input, you'd have to repeat the code, by:

observe({
# Create a reactive relationship with slider2
input$slider2
# Update the second slider - slider1
updateTextInput(session, "slider1", NULL, input$slider2)
)}