Shiny file input button Once the upload is done and map is created , there is reset button whose 18. Build interactive web applications easily with the power of Python’s data and scientific stack. 0 • Updated: 2025-07 Apr 22, 2019 · Hi, Update: This was posted in the RStudio IDE category, but maybe i'll find more info if it is posted in the Shiny category?. Assign the return value to a slot on output in your server function, and in the UI use downloadButton() or downloadLink() to make . It is used in conjunction with the downloadHandler() function in the server function. This is not the path to read to get at the actual data that was uploaded (see ‘datapath’). It is more convenient for an input binding to target a class (and all associated elements) rather than an id, which Appsilon's shiny. Feb 16, 2014 · I know that there is quite some material already available on the web to answer my question but none of them seem to work for me. Details Whenever a file upload completes, the corresponding input variable is set to a dataframe. See the Server value section. Save your app as app. Inputs send values from the client to the server, and when the server has values for the client to display, they are received and rendered by outputs. Jul 23, 2025 · Output: Building Custom Shiny Inputs for Interactive Applications Integrating Custom Inputs into Shiny Apps Custom inputs can be integrated into Shiny apps just like standard inputs. In short, nebula allows you to upload a photo of an otolith (fish ear bone), and mark the positions of the growth rings (like in a tree trunk). This post details a demo Shiny app that generates an Excel report, a PowerPoint report, and a PDF report: The full Shiny app source code is available here. Here’s an example of a custom slider input: Oct 15, 2019 · Shiny apps are often more than just a fixed set of controls that affect a fixed set of outputs. We do all that The post Adding Action Buttons in Rows of DT Data Table in R Shiny appeared first on . Both file and folder selection as well as file saving is available. size The size of the uploaded data, in bytes. Follow these steps to add an action button to your app: Add ui. For example, adding options (shiny. The decorated function may be sync or async, and should do one of the following: Return a string. In case the app is running locally this gives the user direct access to the file system without the need to ``download'' files to a temporary location. Details Use a set of radio buttons to select an item from a list. For example, if there is an input named x, it can be accessed via input["x"]() or input. it/cheatsheets • shiny 1. Shiny is a package that makes it easy to create interactive web apps using R and Python. #' #' Whenever a file upload completes, the corresponding input variable is set to #' a dataframe. 1 Tabler action button Let’s start with a simple input: the action button. Shinywidgets package has actionBttn id guarantees the input uniqueness and a way for Shiny to recover it in the input$<id> element. Where you call this function will determine where the radio buttons will appear within the app’s layout. Description Provides functionality for client-side navigation of the server side file system in shiny apps. Enhance Shiny apps with custom input widgets using the shinyWidgets package, offering advanced customization and user-friendly interfaces. It bridges the gap between data analysis in R and web development, enabling us to create interactive dashboards. icon : TagChild = None An icon to display on the button. Does not work on older browsers, including Internet Explorer 9 and earlier. However, the data backing the file input handler is not reset. dir in Windows, but is there a platform independent solution? I have written an addin that makes it possible to add or remove projects to the Rstudio 1. type The MIME type Jul 7, 2022 · Ease of use for input control The easy-to-use controls that come with shiny. In order to the actionButton with selectInput, I need to add style='margin-top:25px'. frame to perform a loop later on. The standard Shiny widgets are: Master all Shiny input controls with comprehensive examples, customization techniques, and professional form design patterns. Each link contains a complete functional Shiny app that demonstrates how to perform a non trivial task in Shiny. This guide is going through an example of a custom input build from jQuery. frame that contains one row for each selected file, and following columns: name The filename provided by the web browser. as the as you can see on your screens too th #' File Upload Control #' #' Create a file upload control that can be used to upload one or more files. I won’t discuss them here, but you can read more about them in File Upload Control — fileInput. Jun 22, 2025 · Complete visual reference guide for Shiny application structure covering UI/Server architecture, reactive programming, input/output patterns, and essential code templates for rapid development. input Jun 3, 2025 · When a Shiny app is run, the location of “app. The Shiny user session keeps track of all uploads in the session, and when the session ends, Shiny deletes all of the subdirectories where Allows content from the Shiny application to be made available to the user as file downloads (for example, downloading the currently visible data as a CSV file). However I cannot find the code for this to be done. Some buttons are specialized for particular tasks, such as navigation, repeated actions, or presenting menus. The uploaded files can be accessed using the input object in the server function. The Shiny user session keeps track of all uploads in the session, and when the session ends, Shiny deletes all of the subdirectories where Feb 2, 2021 · Hi, I have a shiny app with multiple FileInput objects. app-name: The directory name is the app name app. Jan 29, 2024 · An alternative allowing to use a Shiny action button consists in hiding the file input with some CSS and to trigger the click on this file input when the user clicks on the action button: Mar 26, 2015 · This article describes five patterns to use with Shiny’s action buttons and action links. type like checkbox, button, text … type may also be a good target for the input binding find method, as explained below. 3) in Figure 9. Reset can be performed on any traditional Shiny input widget, which includes: textInput, numericInput, sliderInput, selectInput, selectizeInput, radioButtons, dateInput shinyFiles-buttons: Create a button to summon a shinyFiles dialog Description This function adds the required html markup for the client to access the file system. Here we achieve this by having each button set a different value (e. 1. Where you call this function will determine where Sep 8, 2017 · I have a very large fixed width file I need to read in using my Shiny application. For example, the button class is always btn btn-default and we can’t disable/enable the button in an easy way. Arguments input The input object of the shinyServer() call (usually input) id The same ID as used in the matching call to shinyFilesButton or as the id attribute of the button, in case of a manually defined html. The simplest is to create a new directory for your app, and put a single file called app. Apr 4, 2024 · Is there a way to update the button label of a fileInput button after the button was clicked and the triggered event has finished? I have my fileInput call customized to hide the progress bar and the I want to create an input file dialog. Each widget has an update method to change the value of an input from the server. See full list on rdrr. g. multiple Whether the user should be allowed to select and upload multiple files at once. input_file ui Collection of custom input controls and user interface components for Shiny applications. Quoting Joe Cheng from this shiny-discuss post By default, Shiny limits file uploads to 5MB per file. Selecting the color that fits for your business or design aspect can add value to the usability and appeal of your app. The filename and contents are specified by the corresponding downloadHandler() defined in the server function. This works fine o Jun 22, 2022 · However, when the second file is loaded, the value of variable input$search is kept. Why a second guide on building custom shiny inputs? For more than two years we are developing one of Parameters id : str An id for the download. Here is an example with just two inputs where I'm using the update functions to set the values back to the default values: libr Chapter 15 Custom Inputs Shiny comes with a variety of inputs ranging from buttons to text fields; these inputs send data from the client to the R server. I googled a bit and found most people get around this problem Details An action button appears as a button and has a value that increments each time the user presses the button. label : TagChild An input label. ui <- fluidPage( Whenever a file upload completes, the corresponding input variable is set to a dataframe. To add a file upload button to your app: Add fileInput() to the UI of your app to create a file upload interface. py www/: Place images, CSS, etc Nov 22, 2024 · Is there a way to clear the selected file in an ui. Give your applications a unique and colorful style ! Arguments inputId The input slot that will be used to access the value. The main purpose of an action button is to send a trigger from the client to R when we press the button. update_ () with that you can activate/deactivate a butt shinyFiles This package extends the functionality of shiny by providing an API for client side access to the server file system. RData Files to shiny with fileInput () Fastest Entity Framework Extensions Bulk Insert Bulk Delete Use these functions to create a download button or link; when clicked, it will initiate a browser download. Also, we included a more basic Shiny app that generates an Excel report at the end of this post. react – the bridge that opens up access to libraries like Fluent UI with professional and intuitive building blocks. Shiny allows us to easily create web apps that generate a variety of reports with R. setInputValue, but one could very well create different input names for each button. 2 Server Handling Jul 23, 2025 · Shiny is an R package that allows us to build interactive web applications directly from the R Programming Language. The program displays an error for downloading after generating the new dataframe. The input values are reactive Value s, and can be accessed with the [] operator, or with . This is the simple Apr 14, 2023 · I'm working on a shiny app that analyzes pandas dataframes. This led to problems in the UI where you could keep pressing submit after clicking the Reset button because the data for the last uploaded file was still there, whereas the user should Details Whenever a file upload completes, the corresponding input variable is set to a dataframe. I have an example shiny app as below. download_button (). Learn to implement robust file upload and processing capabilities in Shiny applications. Where you call this function will determine where the button will appear within the app’s layout. The complete up-to-date list of tips, along with all the Details Whenever a file upload completes, the corresponding input variable is set to a dataframe. Learn every input widget from basic controls to advanced custom implementations. Here are some examples: You Whenever a file upload completes, the corresponding input variable is set to a dataframe. size The size of the uploaded Buttons give people a way to trigger an action. 2. Returns : Tag A UI element See Also download download_link Examples ui. , an id) to an input using shiny. Combine an action button with bindEvent() to specify what should happen when a user clicks the button. input_file() input and to enable disable an ui. Basic Structure of Shiny The UI component defines the layout and appearance of the application, while the server logic dictates how the app responds to user input and Details Whenever a file upload completes, the corresponding input variable is set to a dataframe. For example, lets extend the example from above to write the current time to a file every second, and then read and display the contents of that file: Nov 20, 2022 · With R Shiny, adding an icon to an actionButton uses icon() function. Onchange is what you want specifically. 4. datapath Details A file input allows you to upload one or more files. Shiny currently has four different approaches you can use to make your interfaces more dynamic. For example, Shiny provides a function named actionButton that creates an Action Button and a function named sliderInput that creates a slider bar. tldr; I am looking for a way to input a directory path in a shiny app. The end result will be the appearance of a button on the webpage that summons one of the shinyFiles dialog boxes. This class provides access to a Session 's input values. The ease of see of the input components allows for faster development. Out of the box, Shiny offers a number of other useful input bindings e. I want to change the input$search to NULL or empty string or initial status. Inputs may need to be shown or hidden depending on the state of another input, or input controls may need to be created on-the-fly in response to user input. ****kwargs** : TagAttrValue = {} Additional attributes for the button. This is straightforward using the fileInput function. Apr 5, 2023 · One of the easiest ways to load data into a Shiny application is to allow users to upload their own data files. For most of the UI Inputs there exists a corresponding ui. Description Create a file upload control that can be used to upload one or more files. txt", open="w") Is there any way to get only file path from Shiny UI based on the address specified by user? I tried ShinyFiles package, but it gives only directory to choose, not file. rds), a valid MIME type (e. maxRequestSize option. Apr 5, 2020 · While working on my (currently WIP) package nebula, I ran into an issue with resetting the fileInput component in Shiny. This dataframe contains one row for each selected file, and the following columns: name The filename provided by the web browser. Where you call this function will determine where the download button will appear within Build interactive web applications easily with the power of Python’s data and scientific stack. id guarantees the input uniqueness and a way for Shiny to recover it in the input$<id> element. A select input providing a choice of file formats and extensions. io Jun 22, 2025 · Complete cheatsheet for Shiny input controls with code examples, validation patterns, and styling techniques. R would increase the limit to 30MB. Mar 8, 2024 · With shinyjs::reset we can reset the UI components of the file input handler, and with renderText with an empty input we can reset the UI feedback. This determines the responsiveness to changes Additionally if the input like for spectrum is just a basic <input type="text"> you can stick to shiny standard inputs in your code, meaning you can reuse something like the shiny function textinput as it also produces a <input type="text"> element, but covers additional features like a label. The Shiny user session keeps track of all uploads in the session, and when the session ends, Shiny deletes all of the subdirectories where Details An action button appears as a button and has a value that increments each time the user presses the button. R” is the location of the working directory, so all file upload/download must be done from that location as a reference point. Specify the id and label parameters of ui Oct 24, 2025 · Description Provides functionality for client-side navigation of the server side file system in shiny apps. width : Optional [str] = None The width of the button. You can modify this limit by using the shiny. Methods Sep 4, 2019 · A shiny expert can correct me but I don't think there's a good way to do this in just R. a date picker or a selectize box. Reset can be performed on any traditional Shiny input widget, which includes: textInput, numericInput, sliderInput fileConnection <-file( ". See the `Server value` section. label Display label for the control, or NULL for no label. Compared to a regular file input button, a larger file input UI helps users focus on the task where an upload action is the central flow of the web application. To use a select list that allows you to select a single item: Add ui. class may be required to find the element in the DOM. I know the file is cached in the shiny memory, but I just want to reset the FileInput object to look like how it originally did before I uploaded the file, when I press the reset button. R file will be used to tell Shiny both how your app should look, and how it should behave. This can be helpful when you have a computationally heavy task where you don’t want R to be trying to carry out the computation for each input value as you drag a a slider across its scale. The download button or download link allows you to create an input that will initiate a browser download. A list of dictionaries (one for each file upload) with the following keys: name: The filename provided by the web browser. Jul 12, 2017 · The simplest form of an input binding is an action button. Contribute to thomasp85/shinyFiles development by creating an account on GitHub. The R package cannot handle each and every case, so for advanced use cases you need to work using the original docs to Shiny is a package that makes it easy to create interactive web apps using R and Python. input_select() to the UI of your app to create a select list. maxRequestSize=30*1024^2) to the top of server. Shiny makes it easy to offer your users file uploads straight from the browser, which you can then access from your server logic. Specify the id and label parameters of ui. For changing the color of an action button in Shiny, the methods available are inline CSS and CSS styles in an Inputs Inputs allow users to interact with the webpage by clicking a button, entering text, selecting an option, and more. You can replace classical checkboxes with switch button, add colors to radio buttons and checkbox group, use buttons as radio or checkboxes. R contains a fileInput allowing the user to locate the file u A shiny extension for server side file access. Use the fileInput() function to provide an interface for users to upload a file. x(). To add a download button to your app: Add downloadLink to the UI of your app to create a download button. ui. Users can manipulate the UI, which will cause the server to update the UI’s displays (by running Python code). input_date() to define the identifier and label of the file upload. I created a reset button to clear the file from the FileInput object, but it does not work. The inputs shown here are just a sample of the many inputs available in Shiny. This is not the path to read to get at the actual data that was uploaded (see datapath column). For more details and examples visit the official docs. I think the easiest way to understand this data structure is to make a simple app. You can see the results after I uploaded a couple of puppy photos (from Section 7. In case the app is running locally this gives the user direct access to the file system without the need to "download" files to a temporary location. Examples of valid values include a case insensitive extension (e. Action buttons and action links are different from other Shiny widgets because they are intended to be used exclusively with observeEvent() or eventReactive(). The package can be installed from CRAN using install We can add a file upload input in the UI using the function fileInput(), e. This decorator is used to register a function that will be called when the user clicks a download link or button. Mar 18, 2018 · I have been trying for a long time to reset fileInput in a Shiny app and read solutions to similar problems, but my problem still persists. Build an App A Shiny app is an interactive web page (ui) powered by a live Python session run by a server (or by a browser with Shinylive). input_select() to define the identifier and With a basic application that only includes a table to which we ultimately want to add a column containing a button on each row. css fix? A class representing Shiny input values. The path to a temp file that contains the data that was uploaded. Server value A data. Decorator to register a function to handle a download. Specify the inputId and label parameters of radioButtons() to define the identifier and label of the set of radio If your app reads input files, you can use @reactive. 2 Create app directory and file There are several ways to create a Shiny app. The issue I ran into, is once you’ve finished marking your Details The download button or download link allows you to create an input that will initiate a browser download. Enhance your Shiny apps with shinyWidgets, offering custom input widgets, update methods, and a gallery application for dynamic user interfaces. </p> Aug 29, 2016 · I am building a shiny app that requires a user to select a folder on the local machine, which contains the files to be processed by the app. They’re typically found in forms, dialog panels, and dialogs. I suppose that's because I do not understand Shiny's reactive progr Dec 23, 2021 · Reset any input element back to its original value. I am simply stuck on being able to hook the custom row button to the download handler. Fortunately, Shiny is designed to let you create your own custom input components. Create a set of radio buttons used to select an item from a list. Nov 13, 2015 · I am looking for how I can change the style of a fileInput button in shiny app to btn, btn-primary or any other possible style. type: The MIME type reported by the browser (for example, ‘text/plain’), or empty string if the browser didn’t know. fluent package input provides professional and familiar user interface design for your Shiny applications. Run the following code and upload a few files to get a sense of what data Shiny is providing. in this video, I will discuss How to upload a file in R Shiny Dashboard by the user through the user interface. When the "Submit" button is clicked again, it becomes evident that the input$file value is still there. accept A character vector of "unique file type specifiers" which gives the browser a hint as to the Shiny is a package that makes it easy to create interactive web apps using R and Python. This dataframe contains one row for each selected file, and the following columns: reset: Reset input elements to their original values Description Reset any input element back to its original value. Each time files are uploaded, they are written to a new random subdirectory inside of R's process-level temporary directory. /output/name. text/plain or application/pdf) or one of audio/*, video/*, or image/* meaning any audio, video, or image type Jun 28, 2017 · Sometimes you’ll want users to be able to upload their own data to your application. For more, see awesome Shiny extensions. However, I don't know how can I move on from here and access the files directly within the shiny app, for example, get all the uploaded data files into one data. Jun 28, 2017 · Shiny has the ability to offer file downloads that are created on the fly, which makes it easy to build data exporting features. shiny Upload Data to shiny Uploading csv files to Shiny Fastest Entity Framework Extensions Bulk Insert Bulk Delete Feb 15, 2018 · Hello! my ui. 🐝 Awesome R and Python packages offering extended UI or server components for the web framework Shiny - nanxstats/awesome-shiny-extensions Apr 16, 2020 · Each row in the table contains one button that should allow a user to download the data from that row into a report. This id will also define the id of the file choice in the input variable updateFreq The time in milliseconds between file system lookups. To add radio buttons to your app: Add radioButtons() to the UI of your app to create a set of radio buttons. You can either reset one specific input at a time by providing the id of a shiny input, or reset all inputs within an HTML tag by providing the id of an HTML tag. Assign the return value to a slot on output in your server function, and in the UI use downloadButton() or downloadLink() to make Oct 5, 2018 · 7 easy steps to custom inputs in shiny A step by step guide on how to include custom inputs into R Shiny. As many shiny apps are run locally this is equivalent to accessing the filesystem of the users own computer, without the overhead of copying files to temporary locations that is tied to the use of fileInput(). 9. 1. In the server function, we can access the uploaded files via input$foo. input_file () and ui. Also ui. The complexity of working with React components in Shiny applications is taken care of by shiny. Follow up posts will Shiny is a package that makes it easy to create interactive web apps using R and Python. After the tutorial you will be able to: Build your own front-end elements in shiny AND receive their values in R. This file may be deleted if the user performs another upload operation. We will also be showing how to delete rows in a DT data table one by one in R Shiny, how… Jul 3, 2025 · Use these functions to create a download button or link; when clicked, it will initiate a browser download. Unique file type specifier (s) which give the browser a hint as to the type of file the server expects. The input is available under input[[input_id]]. You can use the accept parameter to limit the file extension that can be uploaded. The way my program is currently structured is the ui. download_button? Dec 8, 2016 · I am writing a shiny application and in the UI I want the radio buttons and select input options to be in one row. Interactive File Upload Use the fileInput() function in the UI to allow users to choose the source of the dataset. Follow these steps to add an action button to your app: Add actionButton() to the UI of your app to create an action button. The supported types are: default, primary, info, success 10 Dynamic UI So far, we’ve seen a clean separation between the user interface and the server function: the user interface is defined statically when the app is launched so it can’t respond to anything that happens in the app. input_action_button() to the UI of your app to create an action button. actionButtonStyled solves these two problems: type allows you to add Bootstrap styles to the button. size The size of the uploaded I would like to implement a 'Reset inputs' button in my shiny app. They can be included in UI elements, used in reactive expressions, and interact with other components of the Shiny app. This will be assumed to be a filename; Shiny will return this file to the browser, and the downloaded file will have the same May 1, 2018 · Shiny was designed with an emphasis on distinct input and output components in the UI. R file looks like: library (shiny) library (shinydashboard) dashboardPage May 1, 2019 · Please is there any simple way how to allow the user of R Shiny application (locally, not on server) to select a directory from a computer and then output the path? Jan 19, 2021 · In this tutorial, we will be showing how to add action buttons to a DT data table in an R Shiny application. The width, buttonLabel and placeholder arguments allow you to tweak the appearance in other ways. Details A select list creates a way to select one or more items from a list. csv or . But sometimes, you may want some custom behavior in JavaScript that isn’t a natural fit for a custom input or output binding. Most solutions ultimately lead to using Dean Attali's bri The widget appears as an inline group of: A text input allowing the filename to be modified before download. Action Buttons Action buttons allow the user to tell Shiny when to process data. This event would trigger This creates a default file input using Semantic UI. 2 Inputs As we saw in the previous chapter, you use functions like sliderInput(), selectInput(), textInput(), and numericInput() to insert input controls into your UI specification. R is great for report generation. file_reader() to invalidate the result when the file changes. fileInput('foo'). I am using a solution proposed here. Where you call this function will determine where the select list appears within the app’s layout. size: The size of the uploaded data, in bytes. Dec 2, 2024 · Table of Contents Introduction Why I couldn’t leave my button behind Code Walkthrough Complete Code File Conclusion Introduction I recently have been exploring building things with R Shiny and <p>Fancy drag and drop file upload for <code>shiny</code> apps. Custom inputs are in fact, no different than from Shiny’s out-of-the-box inputs, they work in the same way and are built on the same system. This shiny article shows how to set a reactive value from javascript. Where you call this function will determine where the date selector will appear within the app’s layout. Now we’ll discuss the common structure that underlies all input functions and give a quick overview of the inputs built into Shiny. Overview This package provide custom widgets and other components to enhance your shiny applications. My ui. Both filename and contents can be calculated dynamically at the time the user initiates the download. I did not figure out how to have the app get the new pa The UI needed to support file uploads is simple: just add shiny::fileInput() to your UI. Apr 17, 2022 · Our goal today is to implement a file input area widget for Shiny. Master handling multiple file formats, data validation, security considerations, and real-time processing feedback that transforms your apps into professional data processing platforms. The last position in the file system is automatically remembered between instances, but not shared between several Nov 21, 2024 · I have a Shiny for Python app that uses ui. fluent make it widely accepted by Shiny developers. Allows content from the Shiny application to be made available to the user as file downloads (for example, downloading the currently visible data as a CSV file). A download button. To explain and demonstrate how to build such a custom input, we shall build a switch input, which Jul 23, 2025 · Output: Change the Color of Action Button in Shiny using R Customizing Action Button Colors Shiny’s action button comes in a regular format when not customized. The ability to download files in a Shiny app is already built into Shiny using the downloadHandler function. Jan 6, 2014 · Shiny comes equipped with a variety of useful input components, but as you build more ambitious applications, you may find yourself needing input widgets that we don’t include. r allows the user to upload a file: fileInput ("file_input", label = "Upload your file") Question: Is there a way to capture the name of the file the user ended up uploading? Thank you very much! Sep 10, 2015 · Is there a way to color fileInput button in R shiny? It looks like it is possible as shown here on this page on github. From the javascript side, it's easy to add an event listener when the file is being uploaded. Each of these functions takes two Shiny comes with a family of pre-built widgets, each created with a transparently named R function. How action buttons work Create an action button with actionButton() and an action link with actionLink(). It is more convenient for an input binding to target a class (and all associated elements) rather than an id, which Aug 3, 2016 · Have there been any recent advances that would allow for a user to clear out a file that was read in using fileInput ()? I can see how something like "pattern 4" at the link below might work, but not sure if this would "clear out" the progress bar that shows the prior file was read in, that might require some . input_text_area() pos. This app. py in a directory with the files it uses. To add a file input to your app: Add ui. Feb 12, 2018 · I am building a shiny app which basically upload multiple shape files (dbf,prj,shp,shx) and creates map using leaflet package. Styled Action Button The default shiny actionButton cannot fully use Bootstrap theme or the full features defined by HTML. There are three key techniques for Apr 10, 2022 · 1 I'm pretty stuck here; I have created a simple shiny app with the possibility of uploading multiple files. #' #' Each time files are uploaded, they are written to a new random subdirectory #' inside of R's process-level temporary directory. Jan 19, 2021 · In this tutorial, we will be showing how to add action buttons to a DT data table in an R Shiny application. I have recently realized how I can use choose. The Shiny user session shiny Upload Data to shiny Upload . I don't think anything get's invalidated until after the file upload is done. Many browsers use this to prevent the user from selecting an invalid file. Like most other UI components, there are only two required arguments: id and label. Tabler has built-in HTML buttons with a substantial amount of custom styles, compared to the classic Shiny action button. Shiny provides the fileInput function, which allows users to select and upload their files from the local machine. In this chapter, you’ll learn how to create dynamic user interfaces, changing the UI using code run in the server function. We will also be showing how to delete rows in a DT data table one by one in R Shiny, how to edit rows and how to add rows. Aug 29, 2016 · This document contains a collection of various Shiny tricks that I commonly use or that I know many people ask about. R in it. input_file() to the UI of your app to create a file upload component. Once you’ve finished, you can download the positions as a csv file. . I tried to use some recommended solutions: shinyjs package and refreshing fileInput module with renderUI / uiOutput - but still with no result.