---
output: github_document
---

# reactR <img src="vignettes/logo.svg" alt="reactR logo" width="100px" />

<!-- README.md is generated from README.Rmd. Please edit that file -->

```{r setup, include = FALSE}
knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>",
  fig.path = "man/figures/README-",
  out.width = "100%"
)
```

[![CRAN_Status_Badge](https://www.r-pkg.org/badges/version/reactR)](https://cran.r-project.org/package=reactR)
[![R-CMD-check](https://github.com/react-R/reactR/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/react-R/reactR/actions/workflows/R-CMD-check.yaml)

`reactR` provides a set of convenience functions for using [`React`](https://reactjs.org/) in `R` with `htmlwidget` constructor templates and local JavaScript dependencies.  The `React` ecosystem is rich with components that can enhance `R` web and Shiny apps.  `scaffoldReactWidget()` helps build `htmlwidgets` to integrate these `React` components as `R` `htmlwidgets`.  `scaffoldReactShinyInput()` does the same for `Shiny` inputs.  The local dependency functions are modeled after the `html_dependency_*` functions from RStudio's [`rmarkdown`](https://github.com/rstudio/rmarkdown) package.

## Installation

You can install reactR from CRAN with `install.packages("reactR")`.  For the development version, please use `devtools` as shown below.

```R
# install.packages("devtools")
devtools::install_github("react-R/reactR")
```

## Creating htmlwidgets with React Components

To wrap a `React` component as an `htmlwidget`, please see the tutorial [htmlwidgets with reactR](https://react-r.github.io/reactR/articles/intro_htmlwidgets.html).  Also, there are a variety of examples in the [react-R Github organization](https://github.com/react-R).


[`reactable`](https://github.com/glin/reactable) is a very well-built `htmlwidget` leveraging this functionality.

## Shiny Outputs and Inputs

`htmlwidgets` built with `reactR` work well in Shiny as outputs.  In version `0.4.0` Alan Dipert has added the ability to easily create React-based official `Shiny` inputs with helpers and scaffolds.  Please see the [tutorial](https://react-r.github.io/reactR/articles/intro_inputs.html) for more details.

## Examples

Below are examples of using `reactR` directly.

```R
library(reactR)
library(htmltools)

browsable(tagList(
  tags$div(id = "app"),
  tags$script(
  "
    ReactDOM.render(
      React.createElement(
        'h1',
        null,
        'Powered by React'
      ),
      document.getElementById('app')
    )
  "
  ),
  #add core-js first to work in RStudio Viewer
  html_dependency_corejs(),
  html_dependency_react()
))
```

`reactR` uses the `V8` package if available to transform `JSX` and `ES2015` code with `babel`.

```R
library(reactR)
library(htmltools)

browsable(
  tagList(
    tags$div(id = "app"),
    tags$script(
      babel_transform('ReactDOM.render(<h1>Powered By React/JSX</h1>,document.getElementById("app"))')
    ),
    # add core-js shim first for React in older versions of RStudio Viewer
    #html_dependency_corejs(),
    html_dependency_react()
  )
)
```

## Contributing and Code of Conduct

We welcome contributors and would love your participation.  Please note that this project is released with a [Contributor Code of Conduct](https://github.com/react-R/reactR/blob/master/CONDUCT.md). By participating in this project you agree to abide by the terms.
