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jquery.evently.js
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jquery.evently.js
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// Evently is a macro language for creating template based jQuery apps.
// The strength of Evently is in making widgets that can easily be reused
// between applications.
// First, some utility functions.
// $$ is inspired by @wycats: http://yehudakatz.com/2009/04/20/evented-programming-with-jquery/
function $$(node) {
var data = $(node).data("$$");
if (data) {
return data;
} else {
data = {};
$(node).data("$$", data);
return data;
}
};
(function($) {
$.log = function(m) {
if (window && window.console && window.console.log) {
window.console.log(arguments.length == 1 ? m : arguments);
}
};
$.forIn = function (obj, fun) {
var name;
for (name in obj) {
if (obj.hasOwnProperty(name)) {
fun(name, obj[name]);
}
}
};
$.argsToArray = function(args) {
if (!args.callee) return args;
var array = [];
for (var i=0; i < args.length; i++) {
array.push(args[i]);
};
return array;
}
$.fn.replace = function(elem) {
$(this).empty().append(elem);
};
// Now, core evently helpers
// this allows you to specify callbacks as functions or strings
function evfun(fun, hint) {
if (fun && fun.match && fun.match(/^function/)) {
eval("var f = "+fun);
if (typeof f == "function") {
return function() {
try {
var value = f.apply(this, arguments);
} catch(e) {
// IF YOU SEE AN ERROR HERE IT HAPPENED WHEN WE TRIED TO RUN YOUR FUNCTION
$.log({"message": "Error in evently function.", "error": e,
"src" : fun, "hint":hint});
throw(e);
}
// _init should not bubble
if (hint === '_init') return false;
return value;
};
}
}
return fun;
};
function rfun(me, fun, args) {
// if the field is a function, call it, bound to the widget
var f = evfun(fun, me);
if (typeof f == "function") {
return f.apply(me, args);
} else {
return fun;
}
}
function extractFrom(name, evs) {
return evs[name];
};
function extractEvents(name, ddoc) {
// extract events from ddoc.evently and ddoc.vendor.*.evently
var events = [true, {}]
, vendor = ddoc.vendor || {}
, evently = ddoc.evently || {}
;
$.forIn(vendor, function(k, v) {
if (v.evently && v.evently[name]) {
events.push(v.evently[name]);
}
});
if (evently[name]) {events.push(evently[name]);}
return $.extend.apply(null, events);
}
function applyCommon(events) {
if (events._common) {
$.forIn(events, function(k, v) {
events[k] = $.extend(true, {}, events._common, v);
});
delete events._common;
return events;
} else {
return events;
}
}
// hApply applies the user's handler (h) to the
// elem, bound to trigger based on name.
function hApply(elem, name, h, args) {
if ($.isArray(h)) {
for (var i=0; i < h.length; i++) {
// handle arrays recursively
hApply(elem, name, h[i], args);
}
return;
}
var f = evfun(h, name);
if (typeof f == "function") {
elem.bind(name, {args:args}, f);
} else if (typeof f == "string") {
// just trigger another event
elem.bind(name, {args:args}, function(e) {
$(this).trigger(f);
return false;
});
} else {
// an evently widget
elem.bind(name, {args:args}, function() {
react($(this), h, arguments);
return false;
});
}
// should be a plugin
// if ($.evently.log) {
// elem.bind(name, function() {$.log(elem, name)});
// }
// todo make pathbinder plugin
// if (h.path) {
// elem.pathbinder(name, h.path);
// }
};
function react(me, h, args, ran) {
ran = ran || {};
var fun, name, before = $.evently.fn.before;
for (name in before) {
if (before.hasOwnProperty(name)) {
if (h[name] && !ran[name]) {
ran[name] = true;
var cb = function() {
react(me, h,
$.argsToArray(arguments)
.concat($.argsToArray(args)), ran);
};
before[name].apply(me, [h, cb, args]);
return;
}
}
}
// result of running multiple render engines is undefined
// currently the default renderer is mustache
var rendered;
$.forIn($.evently.fn.render, function(name, fun) {
if (h[name]) {
rendered = fun.apply(me, [h, args]);
}
});
// the after callbacks, like selectors.
$.forIn($.evently.fn.after, function(name, fun) {
if (h[name]) {
fun.apply(me, [h, rendered, args]);
}
});
};
function processEvs(elem, events, app) {
// store the app on the element for later use
if (app) {$$(elem).app = app;}
if (typeof events == "string") {
events = extractEvents(events, app.ddoc);
}
events = applyCommon(events);
$$(elem).evently = events;
if (app && app.ddoc) {
$$(elem).partials = extractEvents("_partials",app.ddoc);
}
return events;
}
// The public API
$.fn.evently = function(events, app, args) {
var elem = $(this);
events = processEvs(elem, events, app);
// setup the handlers onto elem
$.forIn(events, function(name, h) {
hApply(elem, name, h, args);
});
// the after callbacks, like selectors.
$.forIn($.evently.fn.setup, function(name, fun) {
if (events[name]) {
fun.apply(elem, [events[name], args]);
}
});
return this;
};
$.evently = {
connect : function(source, target, events) {
events.forEach(function(ev) {
$(source).bind(ev, function() {
var args = $.makeArray(arguments)
, e1 = args.shift();
args.push(e1);
$(target).trigger(ev, args);
return false;
});
});
},
paths : [],
changesDBs : {},
changesOpts : {},
utils : {
rfun : rfun,
evfun : evfun
},
fn : {
setup : {},
before : {},
render : {},
after : {}
}
};
})(jQuery);
// plugin system
// $.evently.handlers
// _init, _changes
(function($) {
$.evently.fn.setup._init = function(ev, args) {
this.trigger("_init", args);
};
})(jQuery);
// before plugin
(function($) {
$.evently.fn.before.before = function(h, cb, args) {
$.evently.utils.evfun(h.before, this).apply(this, args);
cb()
};
})(jQuery);
// async plugin
(function($) {
$.evently.fn.before.async = function(h, cb, args) {
$.evently.utils.evfun(h.async, this).apply(this, [cb].concat($.argsToArray(args)));
};
})(jQuery);
// Mustache plugin
(function($) {
var rfun = $.evently.utils.rfun;
function mustachioed(me, h, args) {
// global partials stored by processEvs()
var partials = $$(me).partials;
return $($.mustache(
rfun(me, h.mustache, args),
rfun(me, h.data, args),
rfun(me, $.extend(true, partials, h.partials), args)));
};
$.evently.fn.render.mustache = function(h, args) {
var render = (h.render || "replace").replace(/\s/g,"")
, newElem = mustachioed(this, h, args);
this[render](newElem);
return newElem;
};
})(jQuery);
// Selectors plugin applies Evently to nested elements
(function($) {
$.evently.fn.after.selectors = function(h, rendered, args) {
var render = (h.render || "replace").replace(/\s/g,"")
, el = this, app = $$(el).app
, root = (render == "replace") ? el : rendered
, selectors = $.evently.utils.rfun(el, h.selectors, args)
;
$.forIn(selectors, function(selector, handlers) {
$(selector, root).evently(handlers, app, args);
});
};
})(jQuery);
// plugin to run the after callback
(function($) {
$.evently.fn.after.after = function(h, rendered, args) {
$.evently.utils.rfun(this, h.after, args);
};
})(jQuery);