minihtml

minihtml is a package for building html documents in R.

minihtml objects are compatible with shiny - see the vignette

Overview

Need to build	R6 object	alternate initialisation
HTML elements		`htag`
HTML elements	`HTMLElement$new()`	`html_elem()`
HTML document	`HTMLDocument$new()`	`html_doc()`

Quick Examples

HTML Entity	code	result
HTML elements	`htag$a(href = 'http://example.com', "click here")`	`<a href="http://example.com">click here</a>`
HTML elements	`HTMLElement$new('p', "Hello there")`	`<p>Hello there</p>`
HTML elements	`html_elem('p', 'Hello there')$update(style = 'display:none')`	`<p style="display:none">Hello there</p>`
HTML document	`html <- HTMLDocument$new(); html$add('p', 'hello')`	`<html> <p>hello</p> </html>`
HTML document	`html_doc(htag$h1("Big"), htag$p("Hello"))`	`<html> <h1>Big</h1> <p>Hello</p> </html>`

Installation

You can install minihtml from GitHub with:

# install.packages("devtools")
devtools::install_github("coolbutuseless/minihtml")

`htag` helper (autocomplete HTML tags and attributes)

The htag helper is similar to shiny::tag but offers autocomplete to assist in writing the code:

Interface

Individual elements can be created in a number of ways. E.g. creating a div
- As a stand-alone element
  - new_div <- HTMLElement$new('div', class = 'demo')
  - new_div <- html_elem('div', class = 'demo')
  - new_div <- htag$div(class = 'demo')
- As a sub-element of an existing document or element - the element is created, added to the parent document (or element) and returned.
  - doc <- HTMLDocument$new(); new_div <- doc$add('div', class = 'demo')
  - doc <- HTMLDocument$new(); new_div <- doc$div(class = 'demo')
  - elem <- HTMLElement$new('xxx'); new_div <- elem$add('div', class = 'demo')
  - elem <- HTMLElement$new('xxx'); new_div <- elem$div(class = 'demo')
$add() creates an element and adds it to the parent (and returns it)
- new_div <- doc$add('div')
$append() appends the given elements as children
- new_div <- htag$div(); doc$append(new_div, ...)
$new(name, ...), $update(...) and $add(name, ...) all accept ... where
- named arguments are added as attributes of this node
- unnamed argument are added as children of this node

All-in-one example

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Initialse an HTML document
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
my_div <- htag$div()  #  or use `html_elem('div')`

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Add a header and body to the html (and then keep the reference these)
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
top    <- my_div$div()
bottom <- my_div$div()

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Add a title to the header, and an H1 to the body
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
top$h1("Hello RStats")$update(style = "color: #345678")

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Create a 'div' directly within the body, and a 'p' within that 'div'
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bottom$
  update(class="main")$
  p("I needed a more intuitive (to me) method of writing html in R", style = 'font-family: monospace')

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# independently create another div
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
div2 <- htag$div(
  htag$p(
    "This is a small demo of the ",
    htag$span("minihtml", style = 'color: red'),
    "package in action"),
  htag$hr(),
  htag$div(
    htag$button("And it has a cool button!!"),
    htag$span("The button - it does nothing", style = 'font-size: 6px')
  )
)

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Manually append this div to the body
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bottom$append(div2)

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Because github README's don't allow inline styles, the following is a
# screenshot of the rendered HTML
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
my_div

Raw HTML

<div>
  <div>
    <h1 style="color: #345678">
      Hello RStats
    </h1>
  </div>
  <div class="main">
    <p style="font-family: monospace">
      I needed a more intuitive (to me) method of writing html in R
    </p>
    <div>
      <p>
        This is a small demo of the 
        <span style="color: red">
          minihtml
        </span>
        package in action
      </p>
      <hr />
      <div>
        <button>
          And it has a cool button!!
        </button>
        <span style="font-size: 6px">
          The button - it does nothing
        </span>
      </div>
    </div>
  </div>
</div>

Introducing the `minihtml` package for creating HTML documents in R