rivets.coffee
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# rivets.js
# version : 0.1.0
# author : Michael Richards
# license : MIT
window.rivets = do ->
registerBinding = (el, adapter, type, context, keypath) ->
bindings[type] el, adapter.read(context, keypath)
adapter.subscribe context, keypath, (value) ->
bindings[type] el, value
if type in bidirectionalBindings
$(el).bind 'change', ->
adapter.publish context, keypath, getInputValue(this)
setAttribute = (el, attr, value, mirrored=false) ->
if value
$(el).attr attr, if mirrored then attr else value
else
$(el).removeAttr attr
getInputValue = (el) ->
switch $(el).attr 'type'
when 'text', 'textarea', 'password', 'select-one' then $(el).val()
when 'checkbox' then $(el).is ':checked'
bindings =
show: (el, value) ->
if value then $(el).show() else $(el).hide()
hide: (el, value) ->
if value then $(el).hide() else $(el).show()
enabled: (el, value) ->
setAttribute el, 'disabled', !value, true
disabled: (el, value) ->
setAttribute el, 'disabled', value, true
checked: (el, value) ->
setAttribute el, 'checked', value, true
unchecked: (el, value) ->
setAttribute el, 'checked', !value, true
selected: (el, value) ->
setAttribute el, 'selected', value, true
unselected: (el, value) ->
setAttribute el, 'checked', !value, true
text: (el, value) ->
$(el).text value or ''
value: (el, value) ->
$(el).val value
bidirectionalBindings = ['value', 'checked', 'unchecked', 'selected', 'unselected']
bindableAttributes = ['id', 'class', 'name', 'src', 'href', 'alt', 'title', 'placeholder']
for attr in bindableAttributes
do (attr) ->
bindings[attr] = (el, value) ->
setAttribute el, attr, value
bind: (el, adapter, contexts={}) ->
$(el).add($('*', el)).each ->
target = this
nodeMap = target.attributes
if nodeMap.length > 0
[0..(nodeMap.length - 1)].forEach (n) ->
node = nodeMap[n]
if /^data-/.test node.name
type = node.name.replace 'data-', ''
if type of bindings
path = node.value.split '.'
context = path.shift()
keypath = path.join '.'
registerBinding $(target), adapter, type, contexts[context], keypath