Accessing Dynamic Data from Drop down box in Shiny - rstudio

Question

I am creating a shiny dashboard wherein I need to dynamically update information based on an option in a drop down box.
My question is 1. can this be done, and if so: how?
I have created my drop down menu, which works fine, from there I want to same something along the lines of "if outlet xyz is picked, update charts with unique information"
Code thus far:
output$Box1 = renderUI(
selectInput("Outlets",
"Select an Outlet",
c("Start Typing Outlet
Name",as.character(unique(outlets$Outlets))),
"selectoutlet"))
once the outlet has been selected, I want the data in my R script to only update for that one outlet.

Answer 1

As You havent supplied reproducible example, here is the code with mtcars dataset:
library(shiny)
library(dplyr)
library(ggplot2)
ui= fluidPage(
sidebarLayout(
sidebarPanel(
selectInput(inputId= "cyl", label= "cyl",
choices= unique(mtcars$cyl),
selected= sort(unique(mtcars$cyl))[1],
multiple=F)
),
mainPanel(
plotOutput("plot")
)
)
)
server= function(input, output,session) {
df_filtered <-reactive({
data <- mtcars %>% {if (is.null(input$cyl)) . else filter(., cyl %in% input$cyl)} # here is the reactive dataset which You can further use it in table or in the plot
print(data)
data
})
output$plot <- renderPlot({
ggplot(data = df_filtered(), aes(x=cyl,y=mpg)) + geom_point(size=5) # as You can see i have used data = df_filtered()
})
}
shinyApp(ui, server)
Have a look at the comments in the code to get some better idea how it works.