I am trying to make a Shiny app where the user selects a few options and a network and data table will display based on the inputs. I have a diet study database and would like users to be able to specify the predator species they are interested in, the diet metric (weight, volumetric, etc) and the taxonomic level they want nodes identified to. The data table works fine (so I did not include the code) and updates based on the input but the network does not change, it only shows all of the data. When I run the code for generating the plot outside of Shiny it works fine. This is my first shiny attempt so any suggestions would be greatly appreciated.
library(dplyr)
library(igraph)
library(networkD3)
Diet <-data.frame(
Predator_Scientific_Name = rep("Acanthocybium solanderi", 10),
Class_Predator = rep("Actinopterygii", 10),
Order_Predator = rep("Perciformes", 10),
Family_Predator = rep("Scombridae", 10),
Genus_Predator = rep("Acanthocybium", 10),
Species_Predator = rep("solandri", 10),
Class_Prey = rep("Actinopterygii", 10),
Order_Prey = c( "Clupeiformes" , NA , "Perciformes", "Perciformes", "Perciformes", "Perciformes", "Perciformes", "Perciformes", "Tetraodontiformes", "Tetraodontiformes"),
Family_Prey = c("Clupeidae", NA, "Coryphaenidae", "Carangidae", "Scombridae","Echeneidae","Carangidae", "Scombridae", "Balistidae","Diodontidae"),
Genus_Prey = c("Sardinella", NA, "Coryphaena", "Decapterus", "Euthynnus", NA, NA, NA, "Balistes", "Diodon"),
Species_Prey = c("aurita" , "", "hippurus", "punctatus","alletteratus", "", "", "","capriscus", "spp." ),
Lowest_Taxonomic_Identification_Prey = c("Sardinella aurita","Actinopterygii","Coryphaena hippurus","Decapterus punctatus","Euthynnus alletteratus", "Echeneidae", "Carangidae","Scombridae","Balistes capriscus","Diodon spp."),
Frequency_of_Occurrence = c(2.8, 59.1, 1.4, 7.0, 1.4, 1.4, 15.5, 21.1, 2.8, 4.2), StringAsFactors = FALSE
)
pred.name <- unique(Diet$Predator_Scientific_Name)
prey.tax <- unique(Diet$Lowest_Taxonomic_Identification_Prey)
#Progress bar function
compute_data <- function(updateProgress = NULL) {
# Create 0-row data frame which will be used to store data
dat <- data.frame(x = numeric(0), y = numeric(0))
for (i in 1:10) {
Sys.sleep(0.25)
# Compute new row of data
new_row <- data.frame(x = rnorm(1), y = rnorm(1))
# If we were passed a progress update function, call it
if (is.function(updateProgress)) {
text <- paste0("x:", round(new_row$x, 2), " y:", round(new_row$y, 2))
updateProgress(detail = text)
}
# Add the new row of data
dat <- rbind(dat, new_row)
}
dat
}
####
# Define UI for application that draws a histogram
ui <- dashboardPage(
skin = "blue",
dashboardHeader(title = "Diet Database"),
dashboardSidebar(
sidebarMenu(
menuItem("Parameters",
tabName = "paramaters",
icon = shiny::icon("bar-chart")))
),
dashboardBody(
tabItems(
tabItem(
tabName = "paramaters",
fluidRow(
shiny::column(
width = 4,
shinydashboard::box(
title = "Predator",
status = "primary",
solidHeader = TRUE,
collapsible = TRUE,
width = NULL,
shiny::helpText("Select a predator to view its connections and prey items:"),
shiny::selectInput(
"pred",
shiny::h5("Predator Scientific Name:"),
c(NA,pred.name))),
shinydashboard::box(
title = "Prey",
status = "primary",
solidHeader = TRUE,
collapsible = TRUE,
width = NULL,
shiny::helpText("Select a prey taxa to view its connections and predators:"),
shiny::selectInput(
"prey",
shiny::h5("Prey Taxa:"),
c(NA,prey.tax))),
shinydashboard::box(
title = "Diet Metric",
status = "primary",
solidHeader = TRUE,
collapsible = TRUE,
width = NULL,
shiny::helpText("Select a diet metric to use:"),
shiny::selectInput(
"dietmetric",
shiny::h5("Diet Metric:"),
c("Frequency of Occurrence" = "Frequency_of_Occurrence",
"Wet Weight" = "Weight",
"Dry Weight" = "Dry_Weight",
"Volume" = "Volume",
"Index of Relative Importance" = "IRI",
"Index of Caloric Importance" = "ICI",
"Number" = "Number"))),
shinydashboard::box(
title = "Taxonomic Level",
status = "primary",
solidHeader = TRUE,
collapsible = TRUE,
width = NULL,
shiny::helpText("Select a taxonomic level of nodes:"),
shiny::selectInput(
"nodetax",
shiny::h5("Taxonomic Level:"),
c("Order" = "Order",
"Family" = "Family",
"Genus" = "Genus",
"Species" = "Species"))),
shinydashboard::box(
title = "Generate Network",
status = "primary",
solidHeader = T,
collapsible = T,
width = NULL,
actionButton("makenet", "Generate")
)
),
#Area for network to be displayed
shiny::column(
width = 8,
shinydashboard::box(
title = "Trophic Network",
status = "primary",
solidHeader = TRUE,
collapsible = FALSE,
width = NULL,
forceNetworkOutput("netplot")
)
)
))
)))
server <- function(input, output, session) {
network.data <- eventReactive(input$makenet, {
edgelist <- Diet %>% filter(Predator_Scientific_Name == input$pred|Lowest_Taxonomic_Identification_Prey == input$prey
) %>% select(
paste(input$nodetax, "Predator", sep = "_"),
Class_Predator,
paste(input$nodetax, "Prey", sep = "_"),
Class_Prey,
input$dietmetric
)
colnames(edgelist) <- c("SourceName",
"SourceClass",
"TargetName",
"TargetClass",
"Weight")
edgelist <- edgelist[complete.cases(edgelist),]
})
output$netplot <- renderForceNetwork( {
network.data()
ig <-igraph::simplify(igraph::graph_from_data_frame(edgelist[,c(1,3,5)], directed = TRUE))
SourceID <- TargetID <- c()
for (i in 1:nrow(edgelist)) {
SourceID[i] <- which(edgelist[i,1] == V(ig)$name)-1
TargetID[i] <- which(edgelist[i,3] == V(ig)$name)-1
}
#Create edgelist that contains source and target nodes and edge weights
edgeList <- cbind(edgelist, SourceID, TargetID)
nodeList <- data.frame(ID = c(0:(igraph::vcount(ig) - 1)),
nName = igraph::V(ig)$name)
#Determine and assign groups based on class
preddf <-
data.frame(SciName = edgelist[, 1], class = edgelist[, 2])
preydf <-
data.frame(SciName = edgelist[, 3], class = edgelist[, 4])
groupsdf <- rbind(preddf, preydf)
groupsdf <- groupsdf %>% mutate(SciName = as.character(SciName),
class = as.character(class))
nodeGroup <- c()
for (i in 1:nrow(nodeList)) {
index <- which(groupsdf[, 1] == nodeList$nName[i])
nodeGroup[i] <- groupsdf[index[1], 2]
}
nodeList <-
cbind(nodeList,
nodeGroup)
progress <- shiny::Progress$new()
progress$set(message = "Generating your network...", value = 0)
# Close the progress when this reactive exits (even if there's an error)
on.exit(progress$close())
# Create a callback function to update progress.
# Each time this is called:
# - If `value` is NULL, it will move the progress bar 1/5 of the remaining
# distance. If non-NULL, it will set the progress to that value.
# - It also accepts optional detail text.
updateProgress <- function(value = NULL, detail = NULL) {
if (is.null(value)) {
value <- progress$getValue()
value <- value + (progress$getMax() - value) / 5
}
progress$set(value = value, detail = detail)
}
# Compute the new data, and pass in the updateProgress function so
# that it can update the progress indicator.
compute_data(updateProgress)
networkD3::forceNetwork(
Links = edgeList,
# data frame that contains info about edges
Nodes = nodeList,
# data frame that contains info about nodes
Source = "SourceID",
# ID of source node
Target = "TargetID",
# ID of target node
Value = "Weight",
# value from the edge list (data frame) that will be used to value/weight relationship amongst nodes
NodeID = "nName",
# value from the node list (data frame) that contains node
Group = "nodeGroup",
# value from the node list (data frame) that contains value we want to use for node color
fontSize = 25,
opacity = 0.85,
zoom = TRUE,
# ability to zoom when click on the node
opacityNoHover = 0.4 # opacity of labels when static
)
})
}
# Run the application
shinyApp(ui = ui, server = server)
