data.js
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// Zepto.js
// (c) 2010-2014 Thomas Fuchs
// Zepto.js may be freely distributed under the MIT license.
// The following code is heavily inspired by jQuery's $.fn.data()
;(function($){
var data = {}, dataAttr = $.fn.data, camelize = $.camelCase,
exp = $.expando = 'Zepto' + (+new Date()), emptyArray = []
// Get value from node:
// 1. first try key as given,
// 2. then try camelized key,
// 3. fall back to reading "data-*" attribute.
function getData(node, name) {
var id = node[exp], store = id && data[id]
if (name === undefined) return store || setData(node)
else {
if (store) {
if (name in store) return store[name]
var camelName = camelize(name)
if (camelName in store) return store[camelName]
}
return dataAttr.call($(node), name)
}
}
// Store value under camelized key on node
function setData(node, name, value) {
var id = node[exp] || (node[exp] = ++$.uuid),
store = data[id] || (data[id] = attributeData(node))
if (name !== undefined) store[camelize(name)] = value
return store
}
// Read all "data-*" attributes from a node
function attributeData(node) {
var store = {}
$.each(node.attributes || emptyArray, function(i, attr){
if (attr.name.indexOf('data-') == 0)
store[camelize(attr.name.replace('data-', ''))] =
$.zepto.deserializeValue(attr.value)
})
return store
}
$.fn.data = function(name, value) {
return value === undefined ?
// set multiple values via object
$.isPlainObject(name) ?
this.each(function(i, node){
$.each(name, function(key, value){ setData(node, key, value) })
}) :
// get value from first element
(0 in this ? getData(this[0], name) : undefined) :
// set value on all elements
this.each(function(){ setData(this, name, value) })
}
$.fn.removeData = function(names) {
if (typeof names == 'string') names = names.split(/\s+/)
return this.each(function(){
var id = this[exp], store = id && data[id]
if (store) $.each(names || store, function(key){
delete store[names ? camelize(this) : key]
})
})
}
// Generate extended `remove` and `empty` functions
;['remove', 'empty'].forEach(function(methodName){
var origFn = $.fn[methodName]
$.fn[methodName] = function() {
var elements = this.find('*')
if (methodName === 'remove') elements = elements.add(this)
elements.removeData()
return origFn.call(this)
}
})
})(Zepto)