rivets.coffee
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# rivets.js
# version : 0.1.2
# author : Michael Richards
# license : MIT
# Registers a specific binding routine between a model object and a DOM element.
# All information for that routine is passed in when calling this function; the
# specific element to bind to, an adapter interface for the model object, the
# type of binding, the context object and the keypath at which to subscribe to
# on the model object.
registerBinding = (el, adapter, type, context, keypath) ->
bind = bindings[type] || attributeBinding type
bind el, adapter.read context, keypath
adapter.subscribe context, keypath, (value) ->
bind el, value
if type in bidirectionals
el.addEventListener 'change', ->
adapter.publish context, keypath, getInputValue this
# Returns the current input value for the specified element.
getInputValue = (el) ->
switch el.type
when 'text', 'textarea', 'password', 'select-one' then el.value
when 'checkbox', 'radio' then el.checked
# Returns an attribute binding routine for the specified attribute. This is what
# `registerBinding` falls back to when there is no routine for the binding type.
attributeBinding = (attr) -> (el, value) ->
if value then el.setAttribute attr, value else el.removeAttribute attr
# Returns a state binding routine for the specified attribute. Can optionally be
# negatively evaluated. This is used to build a lot of the core state binding
# routines.
stateBinding = (attr, inverse = false) -> (el, value) ->
attributeBinding(attr) el, if inverse is !value then attr else false
# Core binding routines.
bindings =
checked:
stateBinding 'checked'
selected:
stateBinding 'selected'
disabled:
stateBinding 'disabled'
unchecked:
stateBinding 'checked', true
unselected:
stateBinding 'selected', true
enabled:
stateBinding 'disabled', true
text: (el, value) ->
el.innerText = value or ''
html: (el, value) ->
el.innerHTML = value or ''
value: (el, value) ->
el.value = value
show: (el, value) ->
el.style.display = if value then '' else 'none'
hide: (el, value) ->
el.style.display = if value then 'none' else ''
# Bindings that should also be observed for changes on the DOM element in order
# to propogate those changes back to the model object.
bidirectionals = ['value', 'checked', 'unchecked', 'selected', 'unselected']
# The rivets module. Exposes a single `bind` function.
rivets =
bind: (el, adapter, contexts = {}) ->
for node in el.getElementsByTagName '*'
for attribute in node.attributes
if /^data-/.test attribute.name
type = attribute.name.replace 'data-', ''
path = attribute.value.split '.'
context = path.shift()
keypath = path.join '.'
registerBinding node, adapter, type, contexts[context], keypath
# Exports rivets for both CommonJS and the browser.
if module?
module.exports = rivets
else
@rivets = rivets