A key aspect of Shiny apps is reactivity - the illusion that the application is interactive.
A key aspect of Shiny apps is reactivity - the illusion that the application is interactive. See http://shiny.rstudio.com/articles/reactivity-overview.html
Questions tagged [shiny-reactivity]
972 questions
3
votes
0 answers
Markdown report problem with image and results based in dynamic reactive objects
I'd like to create a markdown report using my report.Rmd file but I have two problems, first, the image is not found using (title:  **Happy Dash** ), despite smile image and report.Rmd is in the same…
Leprechault
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3
votes
1 answer
Error in make.unique: 'names' must be a character vector when switching tabsetPanel in shiny
In the example below I get following error many times printed when switching back and forth between radio buttons iris and About-
Warning: Error in make.unique: 'names' must be a character vector
[No stack trace available]
I have looked for the…
AOE_player
- 536
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3
votes
1 answer
How to fix filter options not popping up for esquisserUI in Shiny?
I have some requests for my app.
{1} After readjusting the mainPanel, esquisserUI filters are not popping up anymore. Here is the working example which I followed https://dreamrs.github.io/esquisse/articles/shiny-usage.html
In addition, I also…
AOE_player
- 536
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- 11
3
votes
1 answer
Can I programmatically control plotly zoom functionality without having to re-plot in an R shiny app?
I am trying to make a shiny app in R using Plotly plots.
I am trying to create zoom functionality in the backend of a shiny app, responsive to a click event on a plotly graph (i.e. when a point is clicked, zoom in on that point). However, the only…
Annalise
- 33
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3
votes
1 answer
How to hide or display charts in shiny dashboardBody based on radioGroupButton selection
I am trying to create this dashboard with following structure. It basic structure has 3 levels (Menu, sub Menu and radioGroupButton selection)
SideBar:
Menu1: has 2 sub menus (Sub Menu 1 and Sub Menu2)
Menu2 has 2 sub menus (Sub Menu 3 and Sub…
Kris4u
- 39
- 4
3
votes
1 answer
Shiny: How to change output (visual data to warning message & vice-versa) when input conditions are evaluated via actionButton
I am working on an app that is supposed to take in numerical inputs, and then produce some visualizations and optimization results from said inputs. Problem is that there are conditions that should be met for the inputs, and if the conditions are…
leo.szn
- 33
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3
votes
1 answer
Warning: Error in cat: argument 1 (type 'list') cannot be handled by 'cat' [No stack trace available] in R shiny webtool
Im developing shiny webtool for R functions to generate the indices results on the webtool.
I have 6 R functions and i created 6 combinations in selectinput widget, where each combination is linked with the one R function each.
The 6 R functions are…
mailarlinga
- 33
- 1
- 6
3
votes
1 answer
Data not passed through to module inside modularized shiny tabPanel/navbarPage
My reproducible shiny app creates some data which shall be plotted by calling a plot module using lapply. It, therefore, contains the main app, the modularized Page_ui/Page_server, and the Module_ui/Module_server.
It works as a stand-alone app when…
Cevior
- 97
- 8
3
votes
1 answer
How to reset reactiveValues?
Resetting a single reactive Value is simply done by reactiveVal(NULL). However, how can I completely reset reactiveValues()?
The dummy app contains some of my approaches to retain fresh and clean reactive Values yet none of them really do what I…
mnist
- 6,571
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3
votes
1 answer
How to wait for two blocks of code to run in R Shiny
Suppose I have the following blocks of codes in Shiny:
library(shiny)
rv <- reactiveValues()
observe({
# Event A
# Code Block A
# The code below signals the end of Code Block A
rv$event_a <- F
rv$event_a <- T
})
observe({
# Event B
…
johnny
- 571
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3
votes
1 answer
Detecting a selectInput value change to NULL in R Shiny
In the code below, I cannot detect selectInput's value change to NULL
library(shiny)
ui <- fluidPage(
selectInput(
inputId = "var",
label = "Select a variable:",
choices = c("A", "B", "C"),
selected = NULL,
multiple = T),
…
johnny
- 571
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- 14
3
votes
1 answer
Nested fluidRow layout in Shiny
I wanted to create fluidPage as shown in the image above.
Here is my code for ui.R:
shinyUI(fluidPage(
fluidRow(
column(6,
selectInput(inputId="StoreName",…
Nitin Desai
- 65
- 6
3
votes
2 answers
Setting up a conditional group_by
I have a set of data that looks as such:
+----------+------------+-------+-------+
| step1 | step2 | step3 | step4 |
+----------+------------+-------+-------+
| Region 1 | District A | 1A | 571 |
| Region 1 | District A | 1A | 356…
user9302275
3
votes
1 answer
Make shiny's `dateRangeInput`'s `end` always bigger than `start`
I'm making a shiny app with dateRangeInput. I want to make the date selection in such a way, that the user cannot select smaller date in second date input than first date input.
For example from the above image, shiny now let's user select dates…
Naveen Reddy Marthala
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3
votes
3 answers
How to reactively change title of ShinyDashboard box in R?
My code looks like below where user can select location from sidebarpanel and based on user selection data is displayed in mainpanel. Next, I would like to dynamically change the title of the plot based on user selection. For example, If user…
biggboss2019
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