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translating---geekpi
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How to write web apps in R with Shiny
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============================================================
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Image by :
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opensource.com
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Happy new year! I'm in the thick of working on a couple of larger articles this month, so look for those in the coming weeks. For this month's Nooks and Crannies, I want to point out briefly a great R library I've been playing with for my own self-education.
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A close friend of mine has been hacking things in R lately. I've been intrigued, and I've been trying to squeeze in a little time to at least learn more about R and the kinds of things you can do with it. Figuring out the number-crunching capabilities is an ongoing struggle for me, as I'm not nearly the brilliant math-oriented mind my friend is. It's kind of a slow go for me, but I've been trying to relate it to my experience in other areas, and I started thinking about even very simple web applications.
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[Shiny][1] is a toolkit from RStudio that makes creating web applications much easier. Installation is easy from an R console, just one line, and the latest stable version will be loaded up for you to use. There's a great [tutorial][2] that walks you through the concepts of setting up application, building one skill on top of prior lessons. Shiny is licensed GPLv3, and the source is available on [GitHub][3].
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Here's a simple little web application written with Shiny:
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```
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library(shiny)
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server <- function(input, output, session) {
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observe({
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myText <- paste("Value above is: ", input$textIn)
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updateTextInput(session, "textOut", value=myText)
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})
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}
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ui <- basicPage(
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h3("My very own sample application!"),
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textInput("textIn", "Input goes here, please."),
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textInput("textOut", "Results will be printed in this box")
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)
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shinyApp(ui = ui, server = server)
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```
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When you type in the input box, the text is copied after the prefix in the output box. This is nothing fancy, but it shows you the fundamental structure of a Shiny application. The "server" section lets you handle all your back-end work, such as calculations, database retrieval, or whatever else the app needs to happen. The "UI" section defines the interface, which can be as simple or as complicated as needed.
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Included in Shiny are extensive capabilities for styling and display themes using [Bootstrap][4], so you can, after learning a bit, create extensive, feature-rich applications for the web in R. Add-on packages can extend the capabilities to even more advanced JavaScript applications, templating, and more.
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You can handle the back-end work of Shiny in several ways. If you're just running your application locally, having the library loaded will do the trick. For applications you want to serve out to the web, you can share them on [RStudio's Shiny website][5], run an open source version of the Shiny server, or buy Shiny Server Pro from RStudio via a yearly subscription service.
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Experienced R gurus may already know all about Shiny; it's been around a couple of years now. For people like me who come from a completely different sort of programming and want to learn a bit about R, I've found it quite helpful.
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--------------------------------------------------------------------------------
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作者简介：
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D Ruth Bavousett - D Ruth Bavousett has been a system administrator and software developer for a long, long time, getting her professional start on a VAX 11/780, way back when. She spent a lot of her career (so far) serving the technology needs of libraries, and has been a contributor since 2008 to the Koha open source library automation suite.Ruth is currently a Perl Developer at cPanel in Houston, and also serves as chief of staff for two cats.
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/17/1/writing-new-web-apps-shiny
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作者：[D Ruth Bavousett][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://opensource.com/users/druthb
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[1]:http://shiny.rstudio.com/
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[2]:http://shiny.rstudio.com/tutorial
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[3]:https://github.com/studio/shiny
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[4]:http://getbootstrap.com/
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[5]:http://shinyapps.io/
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@ -0,0 +1,68 @@
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如何用 R 语言的 Shiny 库编写 web 程序
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============================================================
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图片提供：
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opensource.com
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新年快乐！我这个月在写一些更加长的文章，所以你可以在未来几个星期内寻找它们。对于这个月的 Nooks 和 Crannies，我想简要地提一个我一直在自己在玩的一个很棒的 R 库。
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我的一个亲密朋友最近在用 R 编写东西。我一直都对它很感兴趣，一直在试图挤一点时间，至少学习更多关于 R 以及你可以做的事情的种类。探索 R 的数字处理能力对我而言是一个持续斗争，因为我并不是如我朋友那样有一个数学头脑。这对我来说很慢，但我一直试图将它与我在其他领域的经验联系起来，我甚至开始考虑非常简单的 web 程序。
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[Shiny][1]是一个来自 RStudio 的工具包，它让创建 web 程序变得更容易。它能从 R 控制台轻松安装，只需要一行，最新的稳定版本将加载供你使用。这里有一个很棒的[教程][2]，它会通过设置应用程序的概念、通过前面的课程构建技能的方式引导你。 Shiny 的授权是 GPLv3，源代码可以在 [GitHub][3] 上获得。
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这是一个用 Shiny 写的简单的小 web 程序：
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```
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library(shiny)
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server <- function(input, output, session) {
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observe({
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myText <- paste("Value above is: ", input$textIn)
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updateTextInput(session, "textOut", value=myText)
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})
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}
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ui <- basicPage(
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h3("My very own sample application!"),
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textInput("textIn", "Input goes here, please."),
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textInput("textOut", "Results will be printed in this box")
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)
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shinyApp(ui = ui, server = server)
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```
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当你在输入框中输入时文字时，它会复制提示语句后面的文字。这并没有什么奇特的，但它向你展示了一个 Shiny 程序的基本结构。“服务端”部分允许你处理所有后端工作，如计算、数据库检索或程序需要发生的任何其他操作。“UI”部分定义了接口，它可以根据需要变得简单或复杂。
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Shiny 中包含的大量样式和主题使用的是 [Bootstrap][4]，所以你可以在学习了一点后，就能用 R 创建广泛的、功能丰富的 web 程序。附加包可以扩展功能，甚至更高级的 JavaScript 程序、模板等。
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你可以以几种方式处理 Shiny 的后端工作。如果你只是在本地运行你的程序，加载库会就能做到。对于想要发布到网络上的程序，你可以在[ RStudio 的 Shiny 网站][5]上共享它们，运行开源版本的 Shiny 服务器，或通过年度订阅服务从 RStudio 处购买 Shiny Server Pro。
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经验丰富的 R 大牛可能已经知道 Shiny 了;它已经存在大约几年了。对于像我这样从一个完全不同的编程语言来的人并希望学习一点 R 的人来说，我发现它是相当有帮助的。
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--------------------------------------------------------------------------------
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作者简介：
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D Ruth Bavousett - D Ruth Bavousett 已经成为一名系统管理员和软件开发人员很长时间了，他的专业生涯开始于 VAX 11/780。在她的职业生涯（迄今为止）中，她花费了大量的时间在满足库的需求上，她自 2008 年以来一直是 Koha 开源库自动化套件的贡献者. Ruth 目前是休斯敦 cPanel 的 Perl 开发人员， 的两只猫的工作人员。
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/17/1/writing-new-web-apps-shiny
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作者：[D Ruth Bavousett][a]
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译者：[geekpi](https://github.com/geekpi)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://opensource.com/users/druthb
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[1]:http://shiny.rstudio.com/
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[2]:http://shiny.rstudio.com/tutorial
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[3]:https://github.com/studio/shiny
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[4]:http://getbootstrap.com/
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[5]:http://shinyapps.io/
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