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Showing content from http://cran.rstudio.com/web/packages/shiny/../markdownInput/readme/README.html below:

README

This directory contains the “markdownInput” package for the R programming language. This package is a R-Shiny module providing a Shiny input to write some markdown code and to preview the result. This input has been inspired by the “comment” window of https://github.com/.

To install this package, the easiest is to directly install the package from GitHub:

_{In your R console:}

install.package("devtools")
devtools::install_github("juliendiot42/markdownInput")

Once the package is installed, start using it:

_{In your R console:}

library(markdownInput)
help(package=markdownInput)

Once you have downloaded the package, you can run an example app:

_{In your R console:}

markdownInput::runExample()

In the UI part of your app you should call the markdownInput function.

For example:

ui <- fluidPage(titlePanel("Markdown input"),
                 sidebarLayout(
                   # inputs:
                   sidebarPanel(
                     markdownInput(
                       "mdInputID",
                       label = "Write your text",
                       value = "Write some _markdown_ **here:**"
                       )
                   ),

                   # outputs:
                   mainPanel(
                   h3("Raw value of the input:"),
                   verbatimTextOutput("rawResult"))
                 ))

You can access to the input’s value in the server side by calling the module:

server <- function(input, output, session) {
    # myText is a reactive variable containing the raw markdown text
    myText <- callModule(moduleMarkdownInput, "mdInputID")

    # show "myText"
    output$rawResult <- renderPrint({
        print(myText())
    })
}

When encountering a problem with the package, you can report issues on GitHub directly here.

You can contribute in various ways:

• report an issue (online, see the above section);

• suggest improvements (in the same way as issues);

• propose a pull request (after creating a new branch).

I invest some time and effort to create this package. Please cite it when using it:

_{In your R console:}

citation("markdownInput")

See also citation() for citing R itself.

• shinyAce: Vincent Nijs, Forest Fang, Trestle Technology, LLC and Jeff Allen (2019). shinyAce: Ace Editor Bindings for Shiny.

• shiny: Winston Chang, Joe Cheng, JJ Allaire, Yihui Xie and Jonathan McPherson (2018). shiny: Web Application Framework for R.

• markdown: JJ Allaire, Jeffrey Horner, Yihui Xie, Vicent Marti and Natacha Porte (2018). markdown: ‘Markdown’ Rendering for R.

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