ggvis plots rendered using bind_shiny() aren't reactive

Question

I think I'm missing some basic aspect of ggvis + shiny.

Following the tutorials, plots are constructed in server.R using a series of %>% pipes, ending with bind_shiny, which associates the plot with an identifier that can be referred to in ui.R

What I don't get though is that the plot itself is not reactive in the way that code within renderTable(), renderText() or reactive() will be. So if I want to refer to an input parameter like input$x in defining the plot, it won't work, I'll get an error saying "Operation not allowed without an active reactive context. (You tried to do something that can only be done from inside a reactive expression or observer.)".

For example, if 'input' is the input parameter to the shinyServer function, I might have a plot that looks like:

dataframe %>% ggvis(~ aval, ~ bval) %>% layer_points %>% layer_paths(x = ~xv, y = ~ yv, data = data.frame(xv = c(0, 0), yv = c(0, input$maxValParam)))

where layeR_points is used to plot data in dataframe and layer_paths is being used to draw a vertical line up to the maxValParam value.

Community · Accepted Answer · 2017-05-23 11:58:41Z

6

So this answer might be useful.

It looks like in order to reference your input$maxValParam inside a ggvis() function, the entire ggvis function needs to be wrapped in a reactive. blatantly ripping off the above answer, yours might look something like:

reactive({
  dataframe %>% 
      ggvis() #rest of plotting code %>% 
      add_axis("x", title = input$maxValParam)
}) %>% bind_shiny("plot")

edited May 23, 2017 at 11:58

CommunityBot

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answered Jan 22, 2015 at 5:25

colemand77

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2 Comments

daj Over a year ago

any idea why ggvis is implemented using bind_shiny() function while the shiny reactive plots have their own renderXXX() function? This works but it's kind of confusing that it's not consistent.

colemand77 Over a year ago

I have no idea... I think it has to do with ggvis being interactive as a standalone, so it probably needs different methods. Ggvis documentation might have a clue. Or just ask Hadley.

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