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index.js
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index.js
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var observable = function(el) {
/**
* Extend the original object or create a new empty one
* @type { Object }
*/
el = el || {}
/**
* Private variables
*/
var callbacks = {},
slice = Array.prototype.slice
/**
* Public Api
*/
// extend the el object adding the observable methods
Object.defineProperties(el, {
/**
* Listen to the given `event` ands
* execute the `callback` each time an event is triggered.
* @param { String } event - event id
* @param { Function } fn - callback function
* @returns { Object } el
*/
on: {
value: function(event, fn) {
if (typeof fn == 'function')
(callbacks[event] = callbacks[event] || []).push(fn)
return el
},
enumerable: false,
writable: false,
configurable: false
},
/**
* Removes the given `event` listeners
* @param { String } event - event id
* @param { Function } fn - callback function
* @returns { Object } el
*/
off: {
value: function(event, fn) {
if (event == '*' && !fn) callbacks = {}
else {
if (fn) {
var arr = callbacks[event]
for (var i = 0, cb; cb = arr && arr[i]; ++i) {
if (cb == fn) arr.splice(i--, 1)
}
} else delete callbacks[event]
}
return el
},
enumerable: false,
writable: false,
configurable: false
},
/**
* Listen to the given `event` and
* execute the `callback` at most once
* @param { String } event - event id
* @param { Function } fn - callback function
* @returns { Object } el
*/
one: {
value: function(event, fn) {
function on() {
el.off(event, on)
fn.apply(el, arguments)
}
return el.on(event, on)
},
enumerable: false,
writable: false,
configurable: false
},
/**
* Execute all callback functions that listen to
* the given `event`
* @param { String } event - event id
* @returns { Object } el
*/
trigger: {
value: function(event) {
// getting the arguments
var arglen = arguments.length - 1,
args = new Array(arglen),
fns,
fn,
i
for (i = 0; i < arglen; i++) {
args[i] = arguments[i + 1] // skip first argument
}
fns = slice.call(callbacks[event] || [], 0)
for (i = 0; fn = fns[i]; ++i) {
fn.apply(el, args)
}
if (callbacks['*'] && event != '*')
el.trigger.apply(el, ['*', event].concat(args))
return el
},
enumerable: false,
writable: false,
configurable: false
}
})
return el
}