R Shiny Download: [new] Graph

: You can allow users to choose between PNG, PDF, or SVG by using a selectInput to update the file extension and the device argument in ggsave .

The downloadHandler() function on the server side manages the heavy lifting. It requires two main arguments: filename (the suggested name for the saved file) and content (the function that actually writes the file).

: The file argument in the content function is actually a temporary file path provided by Shiny. Always write your output directly to that path. 4. Alternative: The plotly Export r shiny download graph

server <- function(input, output) { # A reactive expression for the plot ensures consistency between # what the user sees and what they download. plotInput <- reactive({ ggplot(mtcars, aes(x = wt, y = mpg)) + geom_point() + labs(title = "Car Weight vs. Fuel Efficiency") }) output$myPlot <- renderPlot({ plotInput() }) output$downloadPlot <- downloadHandler( filename = function() { paste("mtcars-plot-", Sys.Date(), ".pdf", sep = "") }, content = function(file) { # Use a device-specific function like pdf(), png(), or ggsave() ggsave(file, plot = plotInput(), device = "pdf", width = 8, height = 6) } ) } Use code with caution. 3. Best Practices for High-Quality Exports

: For raster formats like PNG, set a high dpi (e.g., 300) in ggsave to ensure the graph isn't blurry when printed. : You can allow users to choose between

Adding a download feature to your R Shiny application allows users to take their insights offline, turning a transient web visualization into a permanent asset for reports or presentations. To implement this, you combine a UI button with a server-side downloadHandler . 1. Set Up the User Interface

: Never rewrite the plot code inside the downloadHandler . Define the plot once in a reactive({}) block and call it in both renderPlot and downloadHandler . : The file argument in the content function

In your ui.R or the UI portion of your script, you need to provide a trigger for the download. The downloadButton() or downloadLink() functions are standard for this purpose.