Chart not generated in R shiny when run locally using googleVis - r

Question

These are the codes for my UI and server. The issue that I am facing is that when the app is run locally the charts are not being generated.
ui.R
library(googleVis)
library(shiny)
shinyUI(fluidPage(
titlePanel(" Tool"),
sidebarLayout(
sidebarPanel(
radioButtons(inputId="choice", label="What would you like to see?",
choices=c("Overall ","Individual"))
),
mainPanel(
htmlOutput("View")
)
)
))
server.R
library(googleVis)
require(googleVis)
shinyServer(function(input, output) {
n = 100
dates = seq(Sys.Date(), by = 'day', length = n)
x = 10 * rnorm(n)
y = 3 * x + 1 + rnorm(n)
label = rep(LETTERS[1:4], each=25)
label[1] = "D"
my.data = data.frame(Date = dates, x, y, label)
output$view <- renderGvis({
gvisMotionChart(my.data, idvar ='label', xvar = 'x', yvar = 'y', timevar= 'Date')
})
}
)

Answer 1

Looks like you have a couple things going wrong here. First, you should have a library open to shiny in both server.R and ui.R; it looks like you reproduced googleVis twice in server.R. In addition I found you capitalized the 'v' in htmlOutput('view'), but this should match the output$view path in server.R which is not capitalized.
On top of this the radio buttons seem superfluous or I do not understand the intent. Typically radio buttons are used so that their input can be fed to a reactive environment in server.R to change a dataset or some other parameter (see shiny tutorial or this example: https://github.com/rstudio/shiny-examples/blob/master/006-tabsets/server.R).
Code below will produce the plot and I have left the radio buttons even though they serve no purpose.
ui.R
library(googleVis)
library(shiny)
shinyUI(fluidPage(
titlePanel(" Tool"),
sidebarLayout(
sidebarPanel(
radioButtons(inputId="choice", label="What would you like to see?",
choices= c("Overall ","Individual"))
),
mainPanel(
htmlOutput("view")
)
)
))
server.R
library(googleVis)
library(shiny)
shinyServer(function(input, output) {
n = 100
dates = seq(Sys.Date(), by = 'day', length = n)
x = 10 * rnorm(n)
y = 3 * x + 1 + rnorm(n)
label = rep(LETTERS[1:4], each=25)
label[1] = "D"
my.data = data.frame(Date = dates, x, y, label)
output$view <- renderGvis({
gvisMotionChart(my.data,
idvar ='label',
xvar = 'x',
yvar = 'y',
timevar= 'Date')
})
})
Be sure to also open it to a browser after the app is launched. Hope that helps.