I have an input variable input$shop_id. Which is used to get data in server function using:
observeEvent(input$shop_id,{id<<-input$shop_id})
`Data=dbGetQuery(connection_name,paste0("SELECT * FROM tab_name WHERE id_shop=",id"))`
That Data is further used to create dynamic UI using selectInput()
output$dependant=renderUI({
selectInput("choice","Choose the Data you want to view",names(Data))
})
I can't come up with the logic of the arrangement of these functions. I cannot get it to work. I have created a sample data and similar sample code for someone to try on:
library(shiny)
library(ggplot2)
ui=fluidPage(
column(6,uiOutput("shop_select")),
column(6,uiOutput("cust_select")),
column(6,uiOutput("select3")),
column(12,offset=6,uiOutput("plot"))
)
server = function(input, output) {
#sample data
shopdata=data.frame(id=c(1,2,3,4,5,6,7,8,9,10),name=c("a","b","c","d","e","f","g","h","i","j"))
cdata=data.frame(id=c(123,465,6798,346,12341,45764,2358,67,457,5687,4562,23,12124,3453,12112),
name=c("sadf","porhg","wetgfjg","hwfhjh","yuigkug","syuif","rtyg","dygfjg","rturjh","kuser","zzsdfadf","jgjwer","jywe","jwehfhjh","kuwerg"),
shop=c(1,2,1,2,4,6,2,8,9,10,3,1,2,5,7),
bill_total=c(12341,123443,456433,234522,45645,23445,3456246,23522,22345,23345,23454,345734,23242,232456,345456),
crating=c(4,4.3,5,1.2,3.2,4,3.3,2.4,3.8,3,3.2,3.3,1.4,2.8,4.1))
output$shop_select=renderUI({
selectInput("shop_id","Shop ID",shopdata$id)
})
output$cust_select=renderUI({
selectInput("cust_id","Customer ID",cdata$id,multiple = T)
})
output$select3=renderUI({
a=input$shop_id
selectInput("choice","Choose the Data you want to view",names(cdata))
})
output$plot=renderUI({
renderPlot({
require(input$choice)
plotOutput(
ggplot(cdata,aes(x=cust_id,y=input$choice))
)})})
}
shinyApp(ui=ui,server=server)
I know I am not clear on the question. Fixing the code which I posted is more than enough to clear my doubt. Basically, I just need to know what is the logic when we have to use while using a renderUI() which is dependent on another renderUI()
If you want to set up a series of subsetting operations and then call renderUI()s on each subset, you will need to take advantage of Shiny's reactive({}) expressions.
Reactive expressions are code chunks that produce variables and their magic is that they "watch" for any changes to their input data. So in your case one you select a shop_id in the first UI element, the reactive expression detects that and updates itself, automatically!
Here is an example showing the updating, just select different shop_id's and watch the available cust_ids change on the fly.
library(shiny)
library(ggplot2)
library(tidyverse)
ui=fluidPage(
column(6,uiOutput("shop_select")),
column(6,uiOutput("cust_select")),
column(6,uiOutput("select3")),
column(12,offset=6,tableOutput("plot"))
)
server = function(input, output) {
#sample data
shopdata=data.frame(id=c(1,2,3,4,5,6,7,8,9,10),name=c("a","b","c","d","e","f","g","h","i","j"))
cdata=data.frame(id=c(123,465,6798,346,12341,45764,2358,67,457,5687,4562,23,12124,3453,12112),
name=c("sadf","porhg","wetgfjg","hwfhjh","yuigkug","syuif","rtyg","dygfjg","rturjh","kuser","zzsdfadf","jgjwer","jywe","jwehfhjh","kuwerg"),
shop=c(1,2,1,2,4,6,2,8,9,10,3,1,2,5,7),
bill_total=c(12341,123443,456433,234522,45645,23445,3456246,23522,22345,23345,23454,345734,23242,232456,345456),
crating=c(4,4.3,5,1.2,3.2,4,3.3,2.4,3.8,3,3.2,3.3,1.4,2.8,4.1))
output$shop_select=renderUI({
selectInput("shop_id","Shop ID",shopdata$id)
})
cdata_reactive <- reactive({
req(input$shop_id)
filter(cdata, shop == input$shop_id)
})
output$cust_select=renderUI({
selectInput("cust_id","Customer ID",cdata_reactive()$id, multiple = T)
})
output$select3=renderUI({
selectInput("choice","Choose the Data you want to view",names(cdata_reactive()))
})
output$plot <- renderTable({
filter(cdata_reactive(), id %in% input$cust_id) %>%
.[input$choice]
})
}
shinyApp(ui=ui,server=server)
A renderUI generates UI elements. Therefore it can only contain ui functions. You need to use it to generate the plotOutput and then use renderPlot separately to add content.
The names you assign in the aes call are the names of variables in the data frame you provided. Therefore x should be id not the values of input$cust_id (which must be called as input$cust_id, since it refers to an input object.
input$choice returns a string, not an object, so you can't use it normally in aes (recall that if this was a normal dataframe your aes would be aes(x=id, y=choice) not aes(x='id', y='choice'). Therefore, you need to use aes_ with the as.name function to convert those strings into proper variable names.
What I think you want to do with input$cust_id is filter cdata to only include rows with the chosen id values. dplyr::filter is the best way to do that.
Finally, you're missing a geom_* in your ggplot call which is needed to actually render your data.
If you replace your output$plot <- ... call with the below code it should work the way I think you want it to:
output$plot=renderUI({
plotOutput('plotout')
})
output$plotout <- renderPlot({
ggplot(dplyr::filter(cdata, id %in% input$cust_id),
aes_(x=as.name('id'),y=as.name(input$choice))) +
geom_point()
})
As for the question in your title, you only need to use observeEvent if you want to limit the code in the expression to only run when a specific trigger occurs. Any reactive expression (reactive, observe, render_ etc.) will become invalidated and update itself if any reactive value (either a reactiveValues object or an input$...) changes. If you have an input$ or a reactive value in a render_ block, it will update if they change -- no observeEvent needed.
My goal is to have a tabsetPanel wrapped in a conditionalPanel whose condition is a global variable being false.
ui.R
mainPanel(
conditionalPanel("searchPage == \"false\"",
tabsetPanel(
tabPanel("Summary",htmlOutput("summary")),
tabPanel("Description", htmlOutput("description"))
))),
global.R
searchPage <- "true"
then in server.R I assign new values to it a few different times, but all like this:
observeEvent(input$openButton,
output$results <- renderUI({
textOutput("")
searchPage <- "false"
}))
No matter what I do, I always get "Uncaught ReferenceError: searchPage is not defined". I've tried changing the global.R to multiple different combinations of using quotes, not using quotes, using <- or <<-, making it this.searchPage, my.searchPage and numerous other things (of course always making server.R and ui.R match too), but haven't had much luck at all.
As mentioned in a comment on the question's post, this is a perfect usecase for the shinyjs toggle()/show()/hide() functions. Whenever you need to conditionally show something where the condition is not a simple javascript expression of an input, it's easy to use these functions instead of a conditionalPanel().
In order to use these functions, you need to have some way to specify the element you want to hide/show (in this case, the mainPanel()). The easist way to do this is to just wrap the entire panel in a div with an id. So define the panel like mainPanel(div(id = "mainpanel", ...)) and voila, there's an id to your panel, and now you can call shinyjs::show("mainpanel") or hide() whenever you want in the server code.
What you are trying to do is not really possible the way you are trying to do it (the server and client are in different environments and don't share variables). You will need to explicitly pass the value from server to client, and there are different approaches to doing that. One way:
library(shiny)
runApp(list(ui = fluidPage(
conditionalPanel(condition='output.bool',
HTML("Hello world")),
actionButton("btn","Press me to toggle")
),
server = function(input, output, session) {
value=TRUE
output$bool <- eventReactive(input$btn,{
value
})
outputOptions(output,"bool",suspendWhenHidden=FALSE)
observeEvent(input$btn,
value <<- !value
)
}))
There are probably better approaches. Hope this helps
I have built a shiny application which is located at the URL below.
https://hdoran.shinyapps.io/openAnalysis/
On the tab called "Choose CrossFit Open Data" I have a textInput() function that calls a function that uses grep(), which is used to find names in a data frame.
The first time the program loads and a name is entered, the search seemingly occurs quickly and names are returned. However, when I delete the name and type a second name, the search is seemingly very slow.
Is there something I can do to optimize this so that is performs quickly always?
I'm still quite new at shiny and am not sure if somehow making this a reactive expression would help. If so, I'm not quite sure how.
Thanks in advance.
The relevant portion of code in the ui.R file
textInput("name", label = 'Enter an athlete name and find your scores',
value = "Enter Name Here")
and the relevant portion of code in the server.R file is
output$myScores <- renderPrint({
df <- filedata()
df[grep(input$name, df$Competitor),]
})
And this portion is also in the ui.R file (though I'm not sure it is relevant to the problem)
verbatimTextOutput("myScores"),
If I understand your goal correctly, you want to give the user the ability to select an input variable based on searching a the competitor column of the dataframe called by filedata()? If so, selectizeInput() is what you are looking for, using server-side selection as outlined here.
Adapted to the code you provided:
ui.r
selectizeInput("name", choices = NULL, multiple = FALSE)
server.r
updateSelectizeInput(session, "name", choices = filedata()$competitor, server = TRUE)
output$myScores <- renderPrint({
df <- filedata()
subset(df, competitor==input$name)
})