Download pdf or png button shiny

To unsubscribe from this group and all its topics, send an email to shiny-discus Luca Fenu. I can save your plots without any problem Are you sure it's not a browser issue? I'm on Chrome. I tried to follow instructions in the posts but somehow I can still download a blank image.

Patrick Renschler. Like this:. I'm not sure what the bug is with the reactive construct, but this seems to work. I've been troubleshooting this issue for the last 4 hours and this work-around fixed it. Barb Banbury. I have been having the same issue, and huge thanks to Patrick for giving a work around. I think ultimately, the issue is that plots are NULL objects. Consider the app below, taken from the documentation for submitButton :. While this app is simple enough that a submit button is adequate, it can be easily translated to app using an action button instead which has the added advantage of being a lot more scalable, since you can now add more inputs that will be independent of the action button :.

Note: The app above could also have been written using eventReactive as outlined in Pattern 2 , instead of isolate. If you have questions about this article or would like to discuss ideas presented here, please post on RStudio Community.

Our developers monitor these forums and answer questions periodically. See help for more help with all things Shiny. Shiny from. How action buttons work Create an action button with actionButton and an action link with actionLink. Each of these functions takes two arguments: inputId - the ID of the button or link label - the label to display in the button or link actionButton "button" , "An action button" actionLink "button" , "An action link" An action button appears as a button in your app.

An action link appears as a hyperlink, but behaves in the same way as an action button. Pattern 1 - Command Use observeEvent to trigger a command with an action button. Why the pattern works Action buttons do not automatically generate actions in Shiny.

Tips observeEvent isolates the block of code in its second argument with isolate. Pattern 2 - Delay reactions Use eventReactive to delay reactions until a user clicks the action button. Example Why the pattern works eventReactive creates a reactive expression that monitors a reactive value, which is set in the first argument of eventReactive. Tips Like observeEvent , eventReactive isolates the block of code in its second argument with isolate.

Pattern 3 - Dueling buttons To build several action buttons that control the same object, combine observeEvent calls with reactiveValues. Example Why the pattern works reactiveValues creates a reactive values object, a list of reactive values that you can update and call programmatically. Example Why this pattern works You can apply the previous pattern to reset an element of a reactvie values object to its intial state NULL.

Pattern 5 - Reset on tab change Observe the value of a tabsetPanel , navlistPanel , or navbarPage with observeEvent to rest the value of an object each time your user switches tabs. Example Why this pattern works This pattern extends the previous reset pattern. Tips Although the example uses tabsetPanel , you can acheive the same effect with navlistPanel and navbarPage. Recap Action buttons and action links are meant to be used with one of observeEvent or eventReactive.

Use observeEvent to trigger a block of code with an action button. Use reactiveValues to maintain an object for multiple action buttons to interact with. Aside: about submit buttons Before action buttons existed in Shiny, there were only submit buttons.

How are submit buttons and action buttons different? The basic parts of a Shiny app. How to get help. App formats and launching apps. Introduction to R Markdown. Introduction to interactive documents. How to get help. App formats and launching apps. Introduction to R Markdown. Introduction to interactive documents. Setting Output args via Render functions. Generating downloadable reports. Shiny Gadgets. Reactivity - An overview.

How to understand reactivity in R. Database basics - dplyr and DBI. Using the pool package basics. Using the pool package advanced. Using dplyr and pool to query a database. Persistent data storage in Shiny apps. Application layout guide. Build a dynamic UI that reacts to user input. Displaying and customizing static tables.

How to use DataTables in a Shiny App. Help users download data from your app. Help users upload files to your app. Active 7 years ago. Viewed 13k times. I looked at these two threads but could not figure it out: Save plots made in a shiny app Shiny downloadHandler doesn't save PNG files I manage to create the download button in the ui and the server seems to be doing everything I want it to do, too.

Any insight is much appreciated! Improve this question. Community Bot 1 1 1 silver badge. Add a comment. Active Oldest Votes. Improve this answer. This is fantastic. Spent the last few hours trying to download a collection of reactive plots, and could not work out what was going wrong. My brain is too fried to understand if there is any negatives to changing from reactive to function , but it appears to work well — Adrian.