withTags () # Ready to take the Shiny tutorial? If so # Click Here! # R will lookup each tag function mentioned inside withTags in the tags object, even if you do not specify tags$. withTags is similar to R’s regular with function. You can save typing by wrapping your HTML objects with withTags. tags $ div ( class = "header", checked = NA, tags $ p ( "Ready to take the Shiny tutorial? If so" ), tags $ a ( href = "/tutorial", "Click Here!" ) ) # Ready to take the Shiny tutorial? If so # Click Here! # withTags This addition lets you nest tags inside of each other (just as in HTML). To add an attribute without a value, set the attribute to NA: tags $ div ( class = "header", checked = NA ) # ChildrenĮach tag function will add unnamed arguments to your tag as HTML children. So for example, if you want to create a div with a class attribute, use: tags $ div ( class = "header" ) # The argument name becomes the attribute name, and the argument value becomes the attribute value. AttributesĪ tag function will use each named argument to add an HTML attribute to the tag. For example, to embed a plug-in or third party application call it with tags$embed.Įvery tag function will treat its arguments in a special way: it will treat named arguments as HTML attributes and unnamed arguments as HTML children. The names of other tags functions conflict with the names of native R functions, so you will need to call them with the tags$ syntax. The helper functions that can call their equivalent tags without using the tag syntex (tags$) are: a, br, code, div, em, h1, h2, h3, h4, h5, h6, hr, img, p, pre, span, and strong. For example, the helper function code calls the tags$code and creates text formatted as computer code. You can call some of the most popular tags with helper functions (that wrap the appropriate tags functions). To create a div tag, you can run: tags $ div () # To create a tag, run an element of tags as a function. names ( tags ) # "a" "abbr" "address" "area" "article" # "aside" "audio" "b" "base" "bdi" # "bdo" "blockquote" "body" "br" "button" # "canvas" "caption" "cite" "code" "col" # "colgroup" "command" "data" "datalist" "dd" # "del" "details" "dfn" "div" "dl" # "dt" "em" "embed" "eventsource" "fieldset" # "figcaption" "figure" "footer" "form" "h1" # "h2" "h3" "h4" "h5" "h6" # "head" "header" "hgroup" "hr" "html" # "i" "iframe" "img" "input" "ins" # "kbd" "keygen" "label" "legend" "li" # "link" "mark" "map" "menu" "meta" # "meter" "nav" "noscript" "object" "ol" # "optgroup" "option" "output" "p" "param" # "pre" "progress" "q" "ruby" "rp" # "rt" "s" "samp" "script" "section" # "select" "small" "source" "span" "strong" # "style" "sub" "summary" "sup" "table" # "tbody" "td" "textarea" "tfoot" "th" # "thead" "time" "title" "tr" "track" # "u" "ul" "var" "video" "wbr" You can learn what the most common tags do in the Shiny HTML tags glossary. If you are familiar with HTML, you will recognize these tags by their names. Each function builds a specific HTML tag. You can do this by passing HTML tags with the tags object. However in some apps, you may want to add custom HTML that is not provided by the usual Shiny functions. In a large majority of your Shiny apps, you will probably never think of using anything more complicated. Shiny’s UI functions are sufficient for creating most Shiny apps. class ( titlePanel ( "Hello Shiny!" )) # "" "list" In R terminology, the output is a list of character strings with a special class that tells Shiny the contents contain HTML. The ui object for 01_example looks like the following code: library ( shiny ) # Define UI for application that draws a histogram ui # Hello Shiny! # Number of bins: # titlePanel ( "Hello Shiny!" ) # Hello Shiny! Many Shiny apps come with a ui object that determines the layout of the app. You can access this app by running: library ( shiny ) runExample ( "01_hello" ) shinyUI I will use the 01_hello app throughout this article as an example. The UI calls R functions that output HTML code. Shiny developers can provide this document as an index.html file or assemble it from R code in their ui object. The user-interface (UI) of a Shiny app is web document. You do not need to know HTML to use Shiny, but if you do, you can use the methods in this article to enhance your app. In this article, you will learn how to supplement the functions in your UI with raw HTML to create highly customized Shiny apps.
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