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# The Article model converts any blog page on into
# a resource we can work with in javascript.
class @Article
@TRANSITION = "all 0.2s ease-out"
@CACHE = {}
# Here we simply do a normal GET request to load the
# html for a given page of the site. The model will
# parse out the article content from the html.
# Lesson here -- HTML is a dataformat. If you don't
# clutter your documents with a massive amount of
# component markup you'll be able to use them as
# resources rather than generating multiple formats
# of all your content.
@fetchFromURL = (href) ->
return null if !href? or href == window.location
if Article.CACHE[href]?
return Article.CACHE[href]
# Request the adjacent article if a href was supplied.
request = new XMLHttpRequest()"GET",href,false)
# Article model processes the http response into
# something that's fun to play with.
if request.status == 200
return Article.CACHE[href] = new Article(html: request.response, href: href)
constructor: (params={}) ->
# Store the href for reference. We'll need it for history.pushState.
@href = params["href"]
# Create a temp element to store and parse the response content.
tempElement = document.createElement("div")
tempElement.innerHTML = params['html']
# Grab and assign the article.
if params['element']?
@element = params['element']
@element = tempElement.querySelector("article")
# Display the table of contents button.
tableOfContents = @element.querySelector("#table_of_contents")
tableOfContents.className = "active" if tableOfContents?
# Grab next and previous hrefs.
@nextURL = tempElement.querySelector("#next a").href if tempElement.querySelector("#next a")?
@prevURL = tempElement.querySelector("#previous a").href if tempElement.querySelector("#previous a")?
# Grab the title of the article.
@title = tempElement.querySelector("h1 a").innerHTML if tempElement.querySelector("h1 a")?
# This property will return true allowing us to handle
# the table of contents.
@tableOfContents = tempElement.querySelector(".archives")?
# Remove temporary element.
tempElement = null
# By default an article is not 'staged' or 'current'
@staged = false
@current = false
# Returns the 'current' state of the of the article.
isCurrent: -> @current
# Returns the 'staged' state of the of the article.
isStaged: -> @staged
# Note: The behaviors all return 'this' for chainability.
# ----------------------------------------------------------------
# Appends the article's element property to the document body.
append: ->
# Reset position.
# Append the article to the body.
body = document.querySelector("body")
# Removes the article's element property from the document body.
remove: ->
if document.removeChild? and @element.parentNode?
# Marks the article's element property by adding a CSS 'hidden'
# class. Don't set the element to display: none or opacity: 0
# here in your script. Manage that in CSS.
hide: ->
@element.className = "hidden"
# I have two special classes for posts. One is onStage. The other
# is offStage. Both classes ensure the post is beneath the current
# post. This just ensures which post is below the other.
stage: ->
@element.className = "post onStage"
@staged = true
@current = false
# Ensure the article is beneath any article that's current 'onStage'.
unstage: ->
@element.className = "post offStage"
@staged = false
@current = false
# Removes any staging classes from the post.
makeCurrent: ->
# Redirect to the root url if we're trying to present the table
# of contents.
if @tableOfContents
window.location = "/"
@element.className = "post"
@staged = false
@current = true
# Update the page title.
document.querySelector("title").innerHTML = "#{@title} |"
# Push the new page state to the history object. Note we pass in an empty
# string for the title. The title isn't utilized by most browsers so we'll
# pass in an empty string to future proof should more browsers utilize
# this aspect of the spec.
history.pushState(null, "", @href) if window.location.href != @href
# We enable the and disable the transition with these two helpers
# only because it's obnoxious to actually translate the page directly
# to your finger with a transition applied. However, we do want it to
# slide back into place once the user removes their finger. Either off
# the screen or simply back into the middle.
enableTransition: ->[Modernizr.prefixed('transition')] = Article.TRANSITION
disableTransition: ->[Modernizr.prefixed('transition')] = ""
# Note: We use 3D transforms when possible to support hardware
# acceleration in webkit.
translate: (xPos) ->
if Modernizr.csstransforms3d[Modernizr.prefixed('transform')] = "translate3d(#{xPos}px, 0, 0)"
else if Modernizr.csstransforms[Modernizr.prefixed('transform')] = "translate(#{xPos}px, 0)"