src/data.js

   1 (function( jQuery ) {
   2
   3 var windowData = {},
   4         rbrace = /^(?:\{.*\}|\[.*\])$/;
   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                 // Ban all objects except for Flash (which handle expandos)
  20                 "object": "clsid:D27CDB6E-AE6D-11cf-96B8-444553540000",
  21                 "applet": true
  22         },
  23
  24         hasData: function( elem ) {
  25                 return !elem.nodeType || (!!elem[ jQuery.expando ] && !jQuery.isEmptyObject(jQuery.cache[ elem[jQuery.expando] ]));
  26         },
  27
  28         data: function( elem, name, data ) {
  29                 if ( !jQuery.acceptData( elem ) ) {
  30                         return;
  31                 }
  32
  33                 elem = elem == window ?
  34                         windowData :
  35                         elem;
  36
  37                 var isNode = elem.nodeType,
  38                         id = isNode ? elem[ jQuery.expando ] : null,
  39                         cache = jQuery.cache, thisCache;
  40
  41                 if ( isNode && !id && typeof name === "string" && data === undefined ) {
  42                         return;
  43                 }
  44
  45                 // Get the data from the object directly
  46                 if ( !isNode ) {
  47                         cache = elem;
  48
  49                 // Compute a unique ID for the element
  50                 } else if ( !id ) {
  51                         elem[ jQuery.expando ] = id = ++jQuery.uuid;
  52                 }
  53
  54                 // Avoid generating a new cache unless none exists and we
  55                 // want to manipulate it.
  56                 if ( typeof name === "object" ) {
  57                         if ( isNode ) {
  58                                 cache[ id ] = jQuery.extend(cache[ id ], name);
  59
  60                         } else {
  61                                 jQuery.extend( cache, name );
  62                         }
  63
  64                 } else if ( isNode && !cache[ id ] ) {
  65                         cache[ id ] = {};
  66                 }
  67
  68                 thisCache = isNode ? cache[ id ] : cache;
  69
  70                 // Prevent overriding the named cache with undefined values
  71                 if ( data !== undefined ) {
  72                         thisCache[ name ] = data;
  73                 }
  74
  75                 return typeof name === "string" ? thisCache[ name ] : thisCache;
  76         },
  77
  78         removeData: function( elem, name ) {
  79                 if ( !jQuery.acceptData( elem ) ) {
  80                         return;
  81                 }
  82
  83                 elem = elem == window ?
  84                         windowData :
  85                         elem;
  86
  87                 var isNode = elem.nodeType,
  88                         id = isNode ? elem[ jQuery.expando ] : elem,
  89                         cache = jQuery.cache,
  90                         thisCache = isNode ? cache[ id ] : id;
  91
  92                 // If we want to remove a specific section of the element's data
  93                 if ( name ) {
  94                         if ( thisCache ) {
  95                                 // Remove the section of cache data
  96                                 delete thisCache[ name ];
  97
  98                                 // If we've removed all the data, remove the element's cache
  99                                 if ( isNode && jQuery.isEmptyObject(thisCache) ) {
 100                                         jQuery.removeData( elem );
 101                                 }
 102                         }
 103
 104                 // Otherwise, we want to remove all of the element's data
 105                 } else {
 106                         if ( isNode && jQuery.support.deleteExpando ) {
 107                                 delete elem[ jQuery.expando ];
 108
 109                         } else if ( elem.removeAttribute ) {
 110                                 elem.removeAttribute( jQuery.expando );
 111
 112                         // Completely remove the data cache
 113                         } else if ( isNode ) {
 114                                 delete cache[ id ];
 115
 116                         // Remove all fields from the object
 117                         } else {
 118                                 for ( var n in elem ) {
 119                                         delete elem[ n ];
 120                                 }
 121                         }
 122                 }
 123         },
 124
 125         // A method for determining if a DOM node can handle the data expando
 126         acceptData: function( elem ) {
 127                 if ( elem.nodeName ) {
 128                         var match = jQuery.noData[ elem.nodeName.toLowerCase() ];
 129
 130                         if ( match ) {
 131                                 return !(match === true || elem.getAttribute("classid") !== match);
 132                         }
 133                 }
 134
 135                 return true;
 136         }
 137 });
 138
 139 jQuery.fn.extend({
 140         data: function( key, value ) {
 141                 var data = null;
 142
 143                 if ( typeof key === "undefined" ) {
 144                         if ( this.length ) {
 145                                 data = jQuery.data( this[0] );
 146
 147                                 if ( this[0].nodeType === 1 ) {
 148                                         var attr = this[0].attributes, name;
 149                                         for ( var i = 0, l = attr.length; i < l; i++ ) {
 150                                                 name = attr[i].name;
 151
 152                                                 if ( name.indexOf( "data-" ) === 0 ) {
 153                                                         name = name.substr( 5 );
 154                                                         dataAttr( this[0], name, data[ name ] );
 155                                                 }
 156                                         }
 157                                 }
 158                         }
 159
 160                         return data;
 161
 162                 } else if ( typeof key === "object" ) {
 163                         return this.each(function() {
 164                                 jQuery.data( this, key );
 165                         });
 166                 }
 167
 168                 var parts = key.split(".");
 169                 parts[1] = parts[1] ? "." + parts[1] : "";
 170
 171                 if ( value === undefined ) {
 172                         data = this.triggerHandler("getData" + parts[1] + "!", [parts[0]]);
 173
 174                         // Try to fetch any internally stored data first
 175                         if ( data === undefined && this.length ) {
 176                                 data = jQuery.data( this[0], key );
 177                                 data = dataAttr( this[0], key, data );
 178                         }
 179
 180                         return data === undefined && parts[1] ?
 181                                 this.data( parts[0] ) :
 182                                 data;
 183
 184                 } else {
 185                         return this.each(function() {
 186                                 var $this = jQuery( this ),
 187                                         args = [ parts[0], value ];
 188
 189                                 $this.triggerHandler( "setData" + parts[1] + "!", args );
 190                                 jQuery.data( this, key, value );
 191                                 $this.triggerHandler( "changeData" + parts[1] + "!", args );
 192                         });
 193                 }
 194         },
 195
 196         removeData: function( key ) {
 197                 return this.each(function() {
 198                         jQuery.removeData( this, key );
 199                 });
 200         }
 201 });
 202
 203 function dataAttr( elem, key, data ) {
 204         // If nothing was found internally, try to fetch any
 205         // data from the HTML5 data-* attribute
 206         if ( data === undefined && elem.nodeType === 1 ) {
 207                 data = elem.getAttribute( "data-" + key );
 208
 209                 if ( typeof data === "string" ) {
 210                         try {
 211                                 data = data === "true" ? true :
 212                                 data === "false" ? false :
 213                                 data === "null" ? null :
 214                                 !jQuery.isNaN( data ) ? parseFloat( data ) :
 215                                         rbrace.test( data ) ? jQuery.parseJSON( data ) :
 216                                         data;
 217                         } catch( e ) {}
 218
 219                         // Make sure we set the data so it isn't changed later
 220                         jQuery.data( elem, key, data );
 221
 222                 } else {
 223                         data = undefined;
 224                 }
 225         }
 226
 227         return data;
 228 }
 229
 230 })( jQuery );