CODEWITHSUNDEEP
rshiny
Hillary Sanders
Hillary Sanders

Reputation: 6047

How to listen for more than one event expression within a Shiny eventReactive handler

I want two different events to trigger an update of the data being used by various plots / outputs in my app. One is a button being clicked (input$spec_button) and the other is a point on a dot being clicked (mainplot.click$click).

Basically, I want to listed for both at the same time, but I'm not sure how to write the code. Here's what I have now:

in server.R:

data <- eventReactive({mainplot.click$click | input$spec_button}, {
    if(input$spec_button){
      # get data relevant to the button
    } else {
      # get data relevant to the point clicked
    }
  })

But the if-else clause doesn't work

Error in mainplot.click$click | input$spec_button : operations are possible only for numeric, logical or complex types

--> Is there some sort of action-combiner function I can use for the mainplot.click$click | input$spec_button clause?

Upvotes: 98

Views: 46601

Answers (6)

JD Caddell
JD Caddell

Reputation: 403

This can still be done with eventReactive by putting your actions in a vector.

eventReactive(
  c(input$spec_button, mainplot.click$click), 
{ ... } )

Upvotes: 6

Vishal Sharma
Vishal Sharma

Reputation: 491

The idea here is to create a reactive function which will execute the condition you want to pass in observeEvent and then you can pass this reactive function to check the validity of the statement. For instance:

validate_event <- reactive({
    # I have used OR condition here, you can use AND also
    req(input$spec_button) || req(mainplot.click$click)
})

observeEvent(validate_event(), 
    { ... } 
)

Keep Coding!

Upvotes: -1

Duncan Brown
Duncan Brown

Reputation: 1132

I know this is old, but I had the same question. I finally figured it out. You include an expression in braces and simply list the events / reactive objects. My (unsubstantiated) guess is that shiny simply performs the same reactive pointer analysis to this expression block as to a standard reactive block.

observeEvent({ 
  input$spec_button
  mainplot.click$click
  1
}, { ... } )

EDIT

Updated to handle the case where the last line in the expression returns NULL. Simply return a constant value.

Upvotes: 107

Selcuk Akbas
Selcuk Akbas

Reputation: 711

I've solved this issue with creating a reactive object and use it in event change expression. As below:

xxchange <- reactive({
paste(input$filter , input$term)
})

output$mypotput <- eventReactive( xxchange(), {
...
...
...
} )

Upvotes: 16

JustAnother
JustAnother

Reputation: 691

Also:

observeEvent(c( 
  input$spec_button,
  mainplot.click$click
), { ... } )

Upvotes: 67

Hillary Sanders
Hillary Sanders

Reputation: 6047

Here's the solution I came up with: basically, create an empty reactiveValues data holder, and then modify its values based on two separate observeEvent instances.

  data <- reactiveValues()
  observeEvent(input$spec_button, {
    data$data <- get.focus.spec(input=input, premise=premise, 
                                itemname=input$dropdown.itemname, spec.info=spec.info)
  })
  observeEvent(mainplot.click$click, {
    data$data <- get.focus.spec(input=input, premise=premise, mainplot=mainplot(),
                                mainplot.click_focus=mainplot.click_focus(),
                                spec.info=spec.info)  
  })

Upvotes: 6

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