src/data.js

   1 var expando = "jQuery" + now(), uuid = 0, windowData = {};
   2
   3 jQuery.extend({
   4         cache: {},
   5
   6         expando:expando,
   7
   8         // The following elements throw uncatchable exceptions if you
   9         // attempt to add expando properties to them.
  10         noData: {
  11                 "embed": true,
  12                 "object": true,
  13                 "applet": true
  14         },
  15
  16         data: function( elem, name, data ) {
  17                 if ( elem.nodeName && jQuery.noData[elem.nodeName.toLowerCase()] ) {
  18                         return;
  19                 }
  20
  21                 elem = elem == window ?
  22                         windowData :
  23                         elem;
  24
  25                 var id = elem[ expando ], cache = jQuery.cache, thisCache;
  26
  27                 if ( !id && typeof name === "string" && data === undefined ) {
  28                         return;
  29                 }
  30
  31                 // Compute a unique ID for the element
  32                 if ( !id ) {
  33                         id = ++uuid;
  34                 }
  35
  36                 // Avoid generating a new cache unless none exists and we
  37                 // want to manipulate it.
  38                 if ( typeof name === "object" ) {
  39                         elem[ expando ] = id;
  40                         thisCache = cache[ id ] = jQuery.extend(true, {}, name);
  41
  42                 } else if ( !cache[ id ] ) {
  43                         elem[ expando ] = id;
  44                         cache[ id ] = {};
  45                 }
  46
  47                 thisCache = cache[ id ];
  48
  49                 // Prevent overriding the named cache with undefined values
  50                 if ( data !== undefined ) {
  51                         thisCache[ name ] = data;
  52                 }
  53
  54                 return typeof name === "string" ? thisCache[ name ] : thisCache;
  55         },
  56
  57         removeData: function( elem, name ) {
  58                 if ( elem.nodeName && jQuery.noData[elem.nodeName.toLowerCase()] ) {
  59                         return;
  60                 }
  61
  62                 elem = elem == window ?
  63                         windowData :
  64                         elem;
  65
  66                 var id = elem[ expando ], cache = jQuery.cache, thisCache = cache[ id ];
  67
  68                 // If we want to remove a specific section of the element's data
  69                 if ( name ) {
  70                         if ( thisCache ) {
  71                                 // Remove the section of cache data
  72                                 delete thisCache[ name ];
  73
  74                                 // If we've removed all the data, remove the element's cache
  75                                 if ( jQuery.isEmptyObject(thisCache) ) {
  76                                         jQuery.removeData( elem );
  77                                 }
  78                         }
  79
  80                 // Otherwise, we want to remove all of the element's data
  81                 } else {
  82                         if ( jQuery.support.deleteExpando ) {
  83                                 delete elem[ jQuery.expando ];
  84
  85                         } else if ( elem.removeAttribute ) {
  86                                 elem.removeAttribute( jQuery.expando );
  87                         }
  88
  89                         // Completely remove the data cache
  90                         delete cache[ id ];
  91                 }
  92         }
  93 });
  94
  95 jQuery.fn.extend({
  96         data: function( key, value ) {
  97                 if ( typeof key === "undefined" && this.length ) {
  98                         return jQuery.data( this[0] );
  99
 100                 } else if ( typeof key === "object" ) {
 101                         return this.each(function() {
 102                                 jQuery.data( this, key );
 103                         });
 104                 }
 105
 106                 var parts = key.split(".");
 107                 parts[1] = parts[1] ? "." + parts[1] : "";
 108
 109                 if ( value === undefined ) {
 110                         var data = this.triggerHandler("getData" + parts[1] + "!", [parts[0]]);
 111
 112                         if ( data === undefined && this.length ) {
 113                                 data = jQuery.data( this[0], key );
 114                         }
 115                         return data === undefined && parts[1] ?
 116                                 this.data( parts[0] ) :
 117                                 data;
 118                 } else {
 119                         return this.trigger("setData" + parts[1] + "!", [parts[0], value]).each(function() {
 120                                 jQuery.data( this, key, value );
 121                         });
 122                 }
 123         },
 124
 125         removeData: function( key ) {
 126                 return this.each(function() {
 127                         jQuery.removeData( this, key );
 128                 });
 129         }
 130 });