rivets.coffee
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# rivets.js
# version : 0.1.3
# author : Michael Richards
# license : MIT
Rivets =
Helpers: {}
class Rivets.Binding
constructor: (@el, @adapter, @type, @context, @keypath) ->
@routine = Rivets.bindings[@type] || Rivets.Helpers.attributeBinding @type
# Sets a value for this binding. Basically just runs the routine on the
# element with a suplied value.
set: (value = null) =>
@routine @el, value || @adapter.read @context, @keypath
# Subscribes to the context object for changes on the specific keypath.
# Conditionally also does the inverse and listens to the element for changes
# to propogate back to the context object.
bind: =>
@set() and @adapter.subscribe @context, @keypath, (value) => @set value
if @type in Rivets.bidirectionals
@el.addEventListener 'change', (el) =>
@adapter.publish @context, @keypath, Rivets.Helpers.getInputValue el
# Returns the current input value for the specified element.
Rivets.Helpers.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.
Rivets.Helpers.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.
Rivets.Helpers.stateBinding = (attr, inverse = false) -> (el, value) ->
binding = Rivets.Helpers.attributeBinding(attr)
binding el, if inverse is !value then attr else false
# Core binding routines.
Rivets.bindings =
checked:
Rivets.Helpers.stateBinding 'checked'
selected:
Rivets.Helpers.stateBinding 'selected'
disabled:
Rivets.Helpers.stateBinding 'disabled'
unchecked:
Rivets.Helpers.stateBinding 'checked', true
unselected:
Rivets.Helpers.stateBinding 'selected', true
enabled:
Rivets.Helpers.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.
Rivets.bidirectionals = ['value', 'checked', 'unchecked', 'selected', 'unselected']
# The rivets module exposes `register` and `bind` functions to register new
# binding routines and bind contexts to DOM elements.
Rivets.interface =
register: (routine, routineFunction) ->
Rivets.bindings[routine] = routineFunction
bind: (el, adapter, contexts = {}) ->
bindings = []
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 '.'
bindings.push new Rivets.Binding node, adapter, type, contexts[context], keypath
binding.bind() for binding in bindings
bindings.length
# Exports rivets for both CommonJS and the browser.
if module?
module.exports = Rivets.interface
else
@rivets = Rivets.interface