R Shiny displays 'loading' while rendering table

Question

My question is really similar to below:

R shiny: display “loading…” message while table is being rendered

Sorry I don't have enough reputation to comment it so I create a new question. My Shiny page has a renderGvis() and a renderDataTable() to display a graph and a table. Because it has to load() a 5 million rows table first, it takes a while to show up. And I have to have something to show it is loading, otherwise the users might leave. I found above post very useful but the loading message disappear too fast. The gap between it disappears and the table shows up is about 20s.

Before I saw above post, I did try below methodology:

#server.R   firstData is a reactive function to get the data for 1st table
output$firstTable = reactive({
return(is.null(firstData()))
})
#ui.R
  conditionalPanel(
      condition = "output.firstTable",
      box(width = 12,
              h1("The data is loading...")))

However, it also disappears too fast. And I don't know the reason. Does anyone have any suggestions?

Thank you in advance.

@Matthew Plourde do you have any suggestions? thanks

Z. Zhang
– Z. Zhang

2016-02-23 01:24:32 +00:00
Commented Feb 23, 2016 at 1:24 — Z. Zhang
– Z. Zhang, Commented Feb 23, 2016 at 1:24

vck · Accepted Answer · 2016-02-24 07:31:17Z

2

You may interested in withProgress i used this method in several app for big data loadings and long computations.

I used data loading in server function as:

stockdata<-withProgress(expr = {readRDS("sample.RDS")}
                        ,message = "Loading... Please wait")

http://shiny.rstudio.com/articles/progress.html

edited Feb 24, 2016 at 7:31

answered Feb 23, 2016 at 8:40

vck

8375 silver badges10 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Z. Zhang Over a year ago

Thanks for your answer. Could you please explain more about how you used withProgress to wrap those big data loadings? Isn't it be outside the server function? Appreciate if you could share some sample codes.

vck Over a year ago

@Z.Zhang i have added the lines i used

Z. Zhang Over a year ago

thanks so so so much for your help. that's what I am looking for for a long time

Z. Zhang Over a year ago

could you please take a look this question? wondering if you have experience with it.stackoverflow.com/questions/35664657/…

Collectives™ on Stack Overflow

R Shiny displays 'loading' while rendering table

1 Answer 1

4 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related