src/data.js

   1 var expando = "jQuery" + now(), uuid = 0, windowData = {};
   2 var emptyObject = {};
   3
   4 jQuery.extend({
   5         cache: {},
   6
   7         expando:expando,
   8
   9         data: function( elem, name, data ) {
  10                 elem = elem == window ?
  11                         windowData :
  12                         elem;
  13
  14                 var id = elem[ expando ], cache = jQuery.cache, thisCache;
  15
  16                 // Handle the case where there's no name immediately
  17                 if ( !name && !id ) {
  18                         return null;
  19                 }
  20
  21                 // Compute a unique ID for the element
  22                 if ( !id ) {
  23                         id = ++uuid;
  24                 }
  25
  26                 // Avoid generating a new cache unless none exists and we
  27                 // want to manipulate it.
  28                 if ( cache[ id ] ) {
  29                         thisCache = cache[ id ];
  30                 } else if ( typeof data === "undefined" ) {
  31                         thisCache = emptyObject;
  32                 } else {
  33                         thisCache = cache[ id ] = {};
  34                 }
  35
  36                 // Prevent overriding the named cache with undefined values
  37                 if ( data !== undefined ) {
  38                         elem[ expando ] = id;
  39                         thisCache[ name ] = data;
  40                 }
  41
  42                 return name ? thisCache[ name ] : thisCache;
  43         },
  44
  45         removeData: function( elem, name ) {
  46                 elem = elem == window ?
  47                         windowData :
  48                         elem;
  49
  50                 var id = elem[ expando ], cache = jQuery.cache, thisCache = cache[ id ];
  51
  52                 // If we want to remove a specific section of the element's data
  53                 if ( name ) {
  54                         if ( thisCache ) {
  55                                 // Remove the section of cache data
  56                                 delete thisCache[ name ];
  57
  58                                 // If we've removed all the data, remove the element's cache
  59                                 if ( jQuery.isEmptyObject(thisCache) ) {
  60                                         jQuery.removeData( elem );
  61                                 }
  62                         }
  63
  64                 // Otherwise, we want to remove all of the element's data
  65                 } else {
  66                         // Clean up the element expando
  67                         try {
  68                                 delete elem[ expando ];
  69                         } catch( e ) {
  70                                 // IE has trouble directly removing the expando
  71                                 // but it's ok with using removeAttribute
  72                                 if ( elem.removeAttribute ) {
  73                                         elem.removeAttribute( expando );
  74                                 }
  75                         }
  76
  77                         // Completely remove the data cache
  78                         delete cache[ id ];
  79                 }
  80         }
  81 });
  82
  83 jQuery.fn.extend({
  84         data: function( key, value ){
  85                 if ( typeof key === "undefined" && this.length ) {
  86                         return jQuery.data( this[0] );
  87                 }
  88
  89                 var parts = key.split(".");
  90                 parts[1] = parts[1] ? "." + parts[1] : "";
  91
  92                 if ( value === undefined ) {
  93                         var data = this.triggerHandler("getData" + parts[1] + "!", [parts[0]]);
  94
  95                         if ( data === undefined && this.length ) {
  96                                 data = jQuery.data( this[0], key );
  97                         }
  98                         return data === undefined && parts[1] ?
  99                                 this.data( parts[0] ) :
 100                                 data;
 101                 } else {
 102                         return this.trigger("setData" + parts[1] + "!", [parts[0], value]).each(function(){
 103                                 jQuery.data( this, key, value );
 104                         });
 105                 }
 106         },
 107
 108         removeData: function( key ){
 109                 return this.each(function(){
 110                         jQuery.removeData( this, key );
 111                 });
 112         }
 113 });