combine two selectbox values in r shiny
I need to combine two select box values in R shiny.
Select box 1 have year, select box 2 have month.
If user select 2018 and 06, I should get 2018-06 into a variable.
I tried paste(input$year,input$month,sep="-") But it is not working.
r select shiny concatenation selectinput
asked Nov 26 '18 at 8:45
qwwwqwww
427211
add a comment |
I need to combine two select box values in R shiny.
Select box 1 have year, select box 2 have month.
If user select 2018 and 06, I should get 2018-06 into a variable.
I tried paste(input$year,input$month,sep="-") But it is not working.
r select shiny concatenation selectinput
asked Nov 26 '18 at 8:45
qwwwqwww
427211
add a comment |
I need to combine two select box values in R shiny.
Select box 1 have year, select box 2 have month.
If user select 2018 and 06, I should get 2018-06 into a variable.
I tried paste(input$year,input$month,sep="-") But it is not working.
r select shiny concatenation selectinput
asked Nov 26 '18 at 8:45
qwwwqwww
427211
I need to combine two select box values in R shiny.
Select box 1 have year, select box 2 have month.
If user select 2018 and 06, I should get 2018-06 into a variable.
I tried paste(input$year,input$month,sep="-") But it is not working.
r select shiny concatenation selectinput
r select shiny concatenation selectinput
asked Nov 26 '18 at 8:45
qwwwqwww
427211
asked Nov 26 '18 at 8:45
qwwwqwww
427211
asked Nov 26 '18 at 8:45
qwwwqwww
427211
asked Nov 26 '18 at 8:45
qwwwqwww
427211
asked Nov 26 '18 at 8:45
qwwwqwww
427211
427211
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
This should do, note that I changed from reative to reactiveValues as I think this should be more intutive for you where you can use the v$value which will contain what you want. I suggest you have a read over https://shiny.rstudio.com/articles/reactivity-overview.html so you have a better grasp of what is happening
library(shiny)
ui <- fluidPage(
textOutput("value"),
selectInput("year","year",choices = c(2017,2018),selected = 1),
selectInput("month","month",choices = c(1:12),selected = 1)
)
server <- function( session,input, output) {
v <- reactiveValues(value=NULL)
observe({
year <- input$year
month <- input$month
if(nchar(month)==1){
month <- paste0("0",month)
}
v$value <- paste(year,month,sep="-")
})
output$value <- renderText({
v$value
})
}
shinyApp(ui, server)
answered Nov 26 '18 at 8:53
Pork ChopPork Chop
15k22545
How to get this value into some variable?
– qwww
Nov 26 '18 at 9:10
that value is in the variable calledCombined()
– Pork Chop
Nov 26 '18 at 9:22
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.)
– qwww
Nov 26 '18 at 9:24
1
If you have a look at the ?reactive you can see that its an expression and not to be used as a value, instead you can either usereactiveValorreactivevalues
– Pork Chop
Nov 26 '18 at 9:50
I am still getting the same error and my shiny app is closing
– qwww
Nov 26 '18 at 9:58
|
show 2 more comments
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1 Answer
1
active
oldest
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1 Answer
1
active
oldest
votes
active
oldest
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active
oldest
votes
This should do, note that I changed from reative to reactiveValues as I think this should be more intutive for you where you can use the v$value which will contain what you want. I suggest you have a read over https://shiny.rstudio.com/articles/reactivity-overview.html so you have a better grasp of what is happening
library(shiny)
ui <- fluidPage(
textOutput("value"),
selectInput("year","year",choices = c(2017,2018),selected = 1),
selectInput("month","month",choices = c(1:12),selected = 1)
)
server <- function( session,input, output) {
v <- reactiveValues(value=NULL)
observe({
year <- input$year
month <- input$month
if(nchar(month)==1){
month <- paste0("0",month)
}
v$value <- paste(year,month,sep="-")
})
output$value <- renderText({
v$value
})
}
shinyApp(ui, server)
answered Nov 26 '18 at 8:53
Pork ChopPork Chop
15k22545
How to get this value into some variable?
– qwww
Nov 26 '18 at 9:10
that value is in the variable calledCombined()
– Pork Chop
Nov 26 '18 at 9:22
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.)
– qwww
Nov 26 '18 at 9:24
1
If you have a look at the ?reactive you can see that its an expression and not to be used as a value, instead you can either usereactiveValorreactivevalues
– Pork Chop
Nov 26 '18 at 9:50
I am still getting the same error and my shiny app is closing
– qwww
Nov 26 '18 at 9:58
|
show 2 more comments
This should do, note that I changed from reative to reactiveValues as I think this should be more intutive for you where you can use the v$value which will contain what you want. I suggest you have a read over https://shiny.rstudio.com/articles/reactivity-overview.html so you have a better grasp of what is happening
library(shiny)
ui <- fluidPage(
textOutput("value"),
selectInput("year","year",choices = c(2017,2018),selected = 1),
selectInput("month","month",choices = c(1:12),selected = 1)
)
server <- function( session,input, output) {
v <- reactiveValues(value=NULL)
observe({
year <- input$year
month <- input$month
if(nchar(month)==1){
month <- paste0("0",month)
}
v$value <- paste(year,month,sep="-")
})
output$value <- renderText({
v$value
})
}
shinyApp(ui, server)
answered Nov 26 '18 at 8:53
Pork ChopPork Chop
15k22545
How to get this value into some variable?
– qwww
Nov 26 '18 at 9:10
that value is in the variable calledCombined()
– Pork Chop
Nov 26 '18 at 9:22
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.)
– qwww
Nov 26 '18 at 9:24
1
If you have a look at the ?reactive you can see that its an expression and not to be used as a value, instead you can either usereactiveValorreactivevalues
– Pork Chop
Nov 26 '18 at 9:50
I am still getting the same error and my shiny app is closing
– qwww
Nov 26 '18 at 9:58
|
show 2 more comments
This should do, note that I changed from reative to reactiveValues as I think this should be more intutive for you where you can use the v$value which will contain what you want. I suggest you have a read over https://shiny.rstudio.com/articles/reactivity-overview.html so you have a better grasp of what is happening
library(shiny)
ui <- fluidPage(
textOutput("value"),
selectInput("year","year",choices = c(2017,2018),selected = 1),
selectInput("month","month",choices = c(1:12),selected = 1)
)
server <- function( session,input, output) {
v <- reactiveValues(value=NULL)
observe({
year <- input$year
month <- input$month
if(nchar(month)==1){
month <- paste0("0",month)
}
v$value <- paste(year,month,sep="-")
})
output$value <- renderText({
v$value
})
}
shinyApp(ui, server)
answered Nov 26 '18 at 8:53
Pork ChopPork Chop
15k22545
This should do, note that I changed from reative to reactiveValues as I think this should be more intutive for you where you can use the v$value which will contain what you want. I suggest you have a read over https://shiny.rstudio.com/articles/reactivity-overview.html so you have a better grasp of what is happening
library(shiny)
ui <- fluidPage(
textOutput("value"),
selectInput("year","year",choices = c(2017,2018),selected = 1),
selectInput("month","month",choices = c(1:12),selected = 1)
)
server <- function( session,input, output) {
v <- reactiveValues(value=NULL)
observe({
year <- input$year
month <- input$month
if(nchar(month)==1){
month <- paste0("0",month)
}
v$value <- paste(year,month,sep="-")
})
output$value <- renderText({
v$value
})
}
shinyApp(ui, server)
answered Nov 26 '18 at 8:53
Pork ChopPork Chop
15k22545
edited Nov 26 '18 at 9:50
answered Nov 26 '18 at 8:53
Pork ChopPork Chop
15k22545
answered Nov 26 '18 at 8:53
Pork ChopPork Chop
15k22545
answered Nov 26 '18 at 8:53
Pork ChopPork Chop
15k22545
15k22545
How to get this value into some variable?
– qwww
Nov 26 '18 at 9:10
that value is in the variable calledCombined()
– Pork Chop
Nov 26 '18 at 9:22
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.)
– qwww
Nov 26 '18 at 9:24
1
If you have a look at the ?reactive you can see that its an expression and not to be used as a value, instead you can either usereactiveValorreactivevalues
– Pork Chop
Nov 26 '18 at 9:50
I am still getting the same error and my shiny app is closing
– qwww
Nov 26 '18 at 9:58
|
show 2 more comments
How to get this value into some variable?
– qwww
Nov 26 '18 at 9:10
that value is in the variable calledCombined()
– Pork Chop
Nov 26 '18 at 9:22
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.)
– qwww
Nov 26 '18 at 9:24
1
If you have a look at the ?reactive you can see that its an expression and not to be used as a value, instead you can either usereactiveValorreactivevalues
– Pork Chop
Nov 26 '18 at 9:50
I am still getting the same error and my shiny app is closing
– qwww
Nov 26 '18 at 9:58
How to get this value into some variable?
– qwww
Nov 26 '18 at 9:10
How to get this value into some variable?
– qwww
Nov 26 '18 at 9:10
that value is in the variable called
Combined()– Pork Chop
Nov 26 '18 at 9:22
that value is in the variable called
Combined()– Pork Chop
Nov 26 '18 at 9:22
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.)– qwww
Nov 26 '18 at 9:24
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.)– qwww
Nov 26 '18 at 9:24
1
1
If you have a look at the ?reactive you can see that its an expression and not to be used as a value, instead you can either use
reactiveVal or reactivevalues– Pork Chop
Nov 26 '18 at 9:50
If you have a look at the ?reactive you can see that its an expression and not to be used as a value, instead you can either use
reactiveVal or reactivevalues– Pork Chop
Nov 26 '18 at 9:50
I am still getting the same error and my shiny app is closing
– qwww
Nov 26 '18 at 9:58
I am still getting the same error and my shiny app is closing
– qwww
Nov 26 '18 at 9:58
|
show 2 more comments
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