src/data.js

   1 (function( jQuery ) {
   2
   3 var windowData = {},
   4         rnum = /^-?\d+(?:\.\d+)?(?:E\d+)?$/,
   5         rbrace = /^(?:{.*}|\[.*\])$/;
   6
   7 jQuery.extend({
   8         cache: {},
   9
  10         // Please use with caution
  11         uuid: 0,
  12
  13         // Unique for each copy of jQuery on the page
  14         expando: "jQuery" + jQuery.now(),
  15
  16         // The following elements throw uncatchable exceptions if you
  17         // attempt to add expando properties to them.
  18         noData: {
  19                 "embed": true,
  20                 "object": true,
  21                 "applet": true
  22         },
  23
  24         data: function( elem, name, data ) {
  25                 if ( elem.nodeName && jQuery.noData[elem.nodeName.toLowerCase()] ) {
  26                         return;
  27                 }
  28
  29                 elem = elem == window ?
  30                         windowData :
  31                         elem;
  32
  33                 var id = elem[ jQuery.expando ], cache = jQuery.cache, thisCache,
  34                         isNode = elem.nodeType,
  35                         store;
  36
  37                 if ( !id && typeof name === "string" && data === undefined ) {
  38                         return;
  39                 }
  40
  41                 // Get the data from the object directly
  42                 if ( !isNode ) {
  43                         cache = elem;
  44                         id = jQuery.expando;
  45
  46                 // Compute a unique ID for the element
  47                 } else if ( !id ) {
  48                         elem[ jQuery.expando ] = id = ++jQuery.uuid;
  49                 }
  50
  51                 // Avoid generating a new cache unless none exists and we
  52                 // want to manipulate it.
  53                 if ( typeof name === "object" ) {
  54                         if ( isNode ) {
  55                                 cache[ id ] = jQuery.extend(true, {}, name);
  56                         } else {
  57                                 store = jQuery.extend(true, {}, name);
  58                                 cache[ id ] = function() {
  59                                         return store;
  60                                 };
  61                         }
  62
  63                 } else if ( !cache[ id ] ) {
  64                         if ( isNode ) {
  65                                 cache[ id ] = {};
  66                         } else {
  67                                 store = {};
  68                                 cache[ id ] = function() {
  69                                         return store;
  70                                 };
  71                         }
  72
  73                 }
  74
  75                 thisCache = isNode ? cache[ id ] : cache[ id ]();
  76
  77                 // Prevent overriding the named cache with undefined values
  78                 if ( data !== undefined ) {
  79                         thisCache[ name ] = data;
  80                 }
  81
  82                 return typeof name === "string" ? thisCache[ name ] : thisCache;
  83         },
  84
  85         removeData: function( elem, name ) {
  86                 if ( elem.nodeName && jQuery.noData[elem.nodeName.toLowerCase()] ) {
  87                         return;
  88                 }
  89
  90                 elem = elem == window ?
  91                         windowData :
  92                         elem;
  93
  94                 var isNode = elem.nodeType,
  95                         id = elem[ jQuery.expando ], cache = jQuery.cache;
  96                 if ( id && !isNode ) {
  97                         id = id();
  98                 }
  99                 var thisCache = cache[ id ];
 100
 101                 // If we want to remove a specific section of the element's data
 102                 if ( name ) {
 103                         if ( thisCache ) {
 104                                 // Remove the section of cache data
 105                                 delete thisCache[ name ];
 106
 107                                 // If we've removed all the data, remove the element's cache
 108                                 if ( jQuery.isEmptyObject(thisCache) ) {
 109                                         jQuery.removeData( elem );
 110                                 }
 111                         }
 112
 113                 // Otherwise, we want to remove all of the element's data
 114                 } else {
 115                         if ( jQuery.support.deleteExpando || !isNode ) {
 116                                 delete elem[ jQuery.expando ];
 117
 118                         } else if ( elem.removeAttribute ) {
 119                                 elem.removeAttribute( jQuery.expando );
 120                         }
 121
 122                         // Completely remove the data cache
 123                         if ( isNode ) {
 124                                 delete cache[ id ];
 125                         }
 126                 }
 127         }
 128 });
 129
 130 jQuery.fn.extend({
 131         data: function( key, value ) {
 132                 if ( typeof key === "undefined" && this.length ) {
 133                         return jQuery.data( this[0] );
 134
 135                 } else if ( typeof key === "object" ) {
 136                         return this.each(function() {
 137                                 jQuery.data( this, key );
 138                         });
 139                 }
 140
 141                 var parts = key.split(".");
 142                 parts[1] = parts[1] ? "." + parts[1] : "";
 143
 144                 if ( value === undefined ) {
 145                         var data = this.triggerHandler("getData" + parts[1] + "!", [parts[0]]);
 146
 147                         // Try to fetch any internally stored data first
 148                         if ( data === undefined && this.length ) {
 149                                 data = jQuery.data( this[0], key );
 150
 151                                 // If nothing was found internally, try to fetch any
 152                                 // data from the HTML5 data-* attribute
 153                                 if ( data === undefined && this[0].nodeType === 1 ) {
 154                                         data = this[0].getAttribute( "data-" + key );
 155
 156                                         if ( typeof data === "string" ) {
 157                                                 try {
 158                                                         data = data === "true" ? true :
 159                                                                 data === "false" ? false :
 160                                                                 data === "null" ? null :
 161                                                                 rnum.test( data ) ? parseFloat( data ) :
 162                                                                 rbrace.test( data ) ? jQuery.parseJSON( data ) :
 163                                                                 data;
 164                                                 } catch( e ) {}
 165
 166                                         } else {
 167                                                 data = undefined;
 168                                         }
 169                                 }
 170                         }
 171
 172                         return data === undefined && parts[1] ?
 173                                 this.data( parts[0] ) :
 174                                 data;
 175
 176                 } else {
 177                         return this.each(function() {
 178                                 var $this = jQuery( this ), args = [ parts[0], value ];
 179
 180                                 $this.triggerHandler( "setData" + parts[1] + "!", args );
 181                                 jQuery.data( this, key, value );
 182                                 $this.triggerHandler( "changeData" + parts[1] + "!", args );
 183                         });
 184                 }
 185         },
 186
 187         removeData: function( key ) {
 188                 return this.each(function() {
 189                         jQuery.removeData( this, key );
 190                 });
 191         }
 192 });
 193
 194 })( jQuery );