a8c387d3 by Michael Richards

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Copyright (c) 2011 Michael Richards
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# Rivets.js
Rivets.js is a declarative, observer-based DOM-binding facility that plays well with existing frameworks and supports multiple contexts. It aims to be lightweight, extensible, and configurable to work with any event-driven model.
## Disclaimer
Rivets.js is alpha software. While it should work well enough for prototyping and weekend projects, it is still undergoing major development. APIs are subject to change.
## Usage
No contrived example here yet, but the `rivets` module is simple. It exposes a single `bind` function that takes three arguements; the parent DOM element that you wish to bind to, an adapter interface, and a set of context objects.
rivets.bind(el, adapter, {user: currentUser, item: item});
#### Available bindings:
- **data-text**: one-way binding that sets the node's text.
- **data-value**: two-way binding that sets the node's value.
- **data-show**: one-way binding that sets the node's display state.
- **data-hide**: one-way inverse binding that sets the node's display state.
- **data-enabled**: one-way binding that sets the node's enabled state.
- **data-disabled**: one-way inverse binding that sets the node's enabled state.
- **data-checked**: two-way binding that sets the node's checked state.
- **data-unchecked**: two-way inverse binding that sets the node's checked state.
- **data-selected**: two-way binding that sets the node's selected state.
- **data-unselected**: two-way inverse binding that sets the node's checked state.
- **data-[attribute]**: one-way binding that sets the node's attribute value (currently only for a few select attributes).
## Adapters
Rivets.js is model interface-agnostic, meaning that it can work with any event-driven model by way of defining an adapter. The following standard adapter observes `change:[attribute]` style events and works with frameworks like [Backbone.js](http://documentcloud.github.com/backbone/), [Spine.js](http://spinejs.com/) and [Stapes.js](http://hay.github.com/stapes/) with minimal alterations for each. If your model's events API differs, it's trivial to write an adapter that will work with your own model objects.
An adapter is an object that responds to `subscribe`, `read` and `publish`.
backboneAdapter = {
subscribe: function(obj, keypath, callback) {
obj.on('change:' + keypath, function(m, v) { callback(v) });
},
read: function(obj, keypath) {
obj.get(keypath);
},
publish: function(obj, keypath, value) {
obj.set(keypath, data);
}
}
#### subscribe(obj, keypath, callback)
- **obj**: The model object that we want to subscribe to for attribute changes. These are what get passed in as context objects when calling `rivets.bind`.
- **keypath**: The attribute name that we want to scope to when subscribing to the model's attribute changes. This would most commonly be a single key or a nested keypath (support for nested keypaths depends on if your model object publishes events on nested attribute changes). You may define and intercept this value in any format, for example if your model object uses `author[profile][bio]` instead of `author.profile.bio`.
- **callback**: The function that performs the binding routine. Call this function with the new attribute value.
#### read(obj, keypath)
- **obj**: The model object that we want to read the attribute from.
- **keypath**: The attribute name that we want to read from the model object.
#### publish(obj, keypath, value)
- **obj**: The model object that we want to set the new attribute value on.
- **keypath**: The attribute name that we want to set on the model object.
- **value**: The new attribute value that we want to set on the model.
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window.rivets = (function() {
var attr, bindableAttributes, bindings, getInputValue, registerBinding, setAttribute, _fn, _i, _len;
registerBinding = function(el, interface, contexts, type, callback) {
return $("*[data-" + type + "]", el).each(function() {
var context, inputValue, keypath, path;
var _this = this;
path = $(this).attr("data-" + type).split('.');
context = path.shift();
keypath = path.join('.');
callback(this, interface.read(contexts[context], keypath));
interface.subscribe(contexts[context], keypath, function(value) {
return callback(_this, value);
});
if (inputValue = getInputValue(this)) {
return interface.publish(contexts[context], keypath, inputValue);
}
});
};
setAttribute = function(el, attr, value, mirrored) {
if (mirrored == null) mirrored = false;
if (value) {
return $(el).attr(attr, mirrored ? attr : value);
} else {
return $(el).removeAttr(attr);
}
};
getInputValue = function(el) {
switch ($(el).attr('type')) {
case 'text':
case 'textarea':
case 'password':
case 'select-one':
return $(this).val();
case 'checkbox':
return $(this).is(':checked');
}
};
bindings = {
show: function(el, value) {
if (value) {
return $(el).show();
} else {
return $(el).hide();
}
},
hide: function(el, value) {
if (value) {
return $(el).hide();
} else {
return $(el).show();
}
},
enabled: function(el, value) {
return setAttribute(el, 'disabled', !value, true);
},
disabled: function(el, value) {
return setAttribute(el, 'disabled', value, true);
},
checked: function(el, value) {
return setAttribute(el, 'checked', value, true);
},
unchecked: function(el, value) {
return setAttribute(el, 'checked', !value, true);
},
selected: function(el, value) {
return setAttribute(el, 'selected', value, true);
},
unselected: function(el, value) {
return setAttribute(el, 'checked', !value, true);
},
text: function(el, value) {
return $(el).text(value || '');
},
value: function(el, value) {
return $(el).val(value);
}
};
bindableAttributes = ['id', 'class', 'name', 'src', 'href', 'alt', 'title', 'placeholder'];
_fn = function(attr) {
return bindings[attr] = function(el, value) {
return setAttribute(el, attr, value);
};
};
for (_i = 0, _len = bindableAttributes.length; _i < _len; _i++) {
attr = bindableAttributes[_i];
_fn(attr);
}
return {
bind: function(el, interface, contexts) {
var callback, type, _results;
if (contexts == null) contexts = {};
_results = [];
for (type in bindings) {
callback = bindings[type];
_results.push(registerBinding(el, interface, contexts, type, callback));
}
return _results;
}
};
})();
{
"name" : "rivets",
"description" : "Declarative DOM-binding facility.",
"version" : "0.1.0",
"author" : "Michael Richards",
"main" : "./lib/rivets.js",
"licenses" : [{
"type" : "MIT",
"url" : "https://github.com/mikeric/rivets/blob/master/LICENSE"
}],
"repository" : {
"type" : "git",
"url" : "https://github.com/mikeric/rivets.git"
},
"dependencies" : {
"jquery" : "1.5.0"
}
}
# rivets.js
# version : 0.1.0
# author : Michael Richards
# license : MIT
window.rivets = do ->
registerBinding = (el, interface, contexts, type, callback) ->
$("*[data-#{type}]", el).each ->
path = $(this).attr("data-#{type}").split '.'
context = path.shift()
keypath = path.join '.'
callback this, interface.read contexts[context], keypath
interface.subscribe contexts[context], keypath, (value) =>
callback this, value
if inputValue = getInputValue this
interface.publish contexts[context], keypath, inputValue
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 $(this).val()
when 'checkbox' then $(this).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
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, interface, contexts={}) ->
for type, callback of bindings
registerBinding el, interface, contexts, type, callback
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