src/data.js

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