Issue with inserting a dygraph in shiny app - r

Question

I'm almost done building an app to explore data published in one of my papers, and thought that it would be nice to have something a little more interactive by adding a dygraph instead of a regular ggplot. Hence my problem... :)
Here is the code I have so far.
EDIT: Thanks to Waldi's comments below, I've slightly modified my code, and minimized it here to facilitate the process
library(shiny)
library(dygraphs)
library(xts)
library(tidyverse)
library(openxlsx)
Sys.setlocale("LC_TIME", "C")
data <- read.xlsx("https://www.bloomassociation.org/wp-content/uploads/2020/08/data.xlsx", sheet = 1) %>%
mutate(date = as.Date(date, origin = "1899-12-30"))
# Define UI for application that draws a histogram
ui <- fluidPage(# Define filters
fluidRow(
column(4,
selectInput("variableInput", label = h4("Show fisheries by:"),
unique(data$variable))),
column(4,
selectInput("unitInput", label = h4("Display data as:"),
unique(data$unit))),
column(4,
sliderInput("dateInput", label = h4("Select time range:"),
min = as.Date("2000-01-01"),
max = as.Date("2017-12-31"),
value = c(as.Date("2000-01-01"), as.Date("2017-12-31")),
timeFormat = "%b %Y")
),
# Display results
tabsetPanel(
tabPanel("Graphical view", withSpinner(dygraphOutput("distPlot"), type = getOption("spinner.type", default = 5), color = getOption("spinner.color", default = "#0A1D27"), size = getOption("spinner.size", default = 0.5))))
))
# Define server logic required to draw a histogram
server <- function(input, output) {
filtered_xts <- reactive({
data_ <- data %>%
filter(variable == input$variableInput,
unit == input$unitInput,
date >= input$dateInput[1],
date <= input$dateInput[2]
) %>%
select(-c(4:5)) %>%
mutate(quantity = round(quantity, 1)) %>%
spread(key = "category", value = "quantity") %>%
replace(is.na(.), 0)
# Debug the filtering // Solution provided by #Waldi; seems to fix most of my problem (see below)
print(data_)
data_ <- xts(data_, order.by = data_$date)
# Debug the xts conversion step
print(data_)
})
output$distPlot <- renderDygraph({
dygraph(filtered_xts()) %>%
dyOptions(fillGraph = TRUE, drawGrid = TRUE, stackedGraph = FALSE) #When stackedGraph = FALSE, everything works well, but I want it TRUE => it no longer works...
}
)
}
# Run the application
shinyApp(ui = ui, server = server)
As you can see, everything works fine when stackedGraph = FALSEin the dyOptions() but it looks like only (part of) the first time-series is included when TRUE... what am I missing?

Answer 1

Looks like filtered_xts() doesn't output any value.
Try:
filtered_xts <- reactive({
data_ <- data %>%
filter(variable == input$variableInput,
unit == input$unitInput,
date >= input$dateInput[1],
date <= input$dateInput[2]
) %>%
select(-c(4:5)) %>%
mutate(quantity = round(quantity, 1)) %>%
spread(key = "category", value = "quantity") %>%
replace(is.na(.), 0) %>% data.table::as.data.table()
})
Following our discussion in comments, the conversion to data.table is more efficient than conversion to xts to be able to fully use dygraphs options.