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         data: function( elem, name, data ) {
  25                 if ( !jQuery.acceptData( elem ) ) {
  26                         return;
  27                 }
  28
  29                 elem = elem == window ?
  30                         windowData :
  31                         elem;
  32
  33                 var isNode = elem.nodeType,
  34                         id = isNode ? elem[ jQuery.expando ] : null,
  35                         cache = jQuery.cache, thisCache;
  36
  37                 if ( isNode && !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
  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(cache[ id ], name);
  55
  56                         } else {
  57                                 jQuery.extend( cache, name );
  58                         }
  59
  60                 } else if ( isNode && !cache[ id ] ) {
  61                         cache[ id ] = {};
  62                 }
  63
  64                 thisCache = isNode ? cache[ id ] : cache;
  65
  66                 // Prevent overriding the named cache with undefined values
  67                 if ( data !== undefined ) {
  68                         thisCache[ name ] = data;
  69                 }
  70
  71                 return typeof name === "string" ? thisCache[ name ] : thisCache;
  72         },
  73
  74         removeData: function( elem, name ) {
  75                 if ( !jQuery.acceptData( elem ) ) {
  76                         return;
  77                 }
  78
  79                 elem = elem == window ?
  80                         windowData :
  81                         elem;
  82
  83                 var isNode = elem.nodeType,
  84                         id = isNode ? elem[ jQuery.expando ] : elem,
  85                         cache = jQuery.cache,
  86                         thisCache = isNode ? cache[ id ] : id;
  87
  88                 // If we want to remove a specific section of the element's data
  89                 if ( name ) {
  90                         if ( thisCache ) {
  91                                 // Remove the section of cache data
  92                                 delete thisCache[ name ];
  93
  94                                 // If we've removed all the data, remove the element's cache
  95                                 if ( isNode && jQuery.isEmptyObject(thisCache) ) {
  96                                         jQuery.removeData( elem );
  97                                 }
  98                         }
  99
 100                 // Otherwise, we want to remove all of the element's data
 101                 } else {
 102                         if ( isNode && jQuery.support.deleteExpando ) {
 103                                 delete elem[ jQuery.expando ];
 104
 105                         } else if ( elem.removeAttribute ) {
 106                                 elem.removeAttribute( jQuery.expando );
 107
 108                         // Completely remove the data cache
 109                         } else if ( isNode ) {
 110                                 delete cache[ id ];
 111
 112                         // Remove all fields from the object
 113                         } else {
 114                                 for ( var n in elem ) {
 115                                         delete elem[ n ];
 116                                 }
 117                         }
 118                 }
 119         },
 120
 121         // A method for determining if a DOM node can handle the data expando
 122         acceptData: function( elem ) {
 123                 if ( elem.nodeName ) {
 124                         var match = jQuery.noData[ elem.nodeName.toLowerCase() ];
 125
 126                         if ( match ) {
 127                                 return !(match === true || elem.getAttribute("classid") !== match);
 128                         }
 129                 }
 130
 131                 return true;
 132         }
 133 });
 134
 135 jQuery.fn.extend({
 136         data: function( key, value ) {
 137                 if ( typeof key === "undefined" ) {
 138                         return this.length ? jQuery.data( this[0] ) : null;
 139
 140                 } else if ( typeof key === "object" ) {
 141                         return this.each(function() {
 142                                 jQuery.data( this, key );
 143                         });
 144                 }
 145
 146                 var parts = key.split(".");
 147                 parts[1] = parts[1] ? "." + parts[1] : "";
 148
 149                 if ( value === undefined ) {
 150                         var data = this.triggerHandler("getData" + parts[1] + "!", [parts[0]]);
 151
 152                         // Try to fetch any internally stored data first
 153                         if ( data === undefined && this.length ) {
 154                                 data = jQuery.data( this[0], key );
 155
 156                                 // If nothing was found internally, try to fetch any
 157                                 // data from the HTML5 data-* attribute
 158                                 if ( data === undefined && this[0].nodeType === 1 ) {
 159                                         data = this[0].getAttribute( "data-" + key );
 160
 161                                         if ( typeof data === "string" ) {
 162                                                 try {
 163                                                         data = data === "true" ? true :
 164                                                                 data === "false" ? false :
 165                                                                 data === "null" ? null :
 166                                                                 !jQuery.isNaN( data ) ? parseFloat( data ) :
 167                                                                 rbrace.test( data ) ? jQuery.parseJSON( data ) :
 168                                                                 data;
 169                                                 } catch( e ) {}
 170
 171                                         } else {
 172                                                 data = undefined;
 173                                         }
 174                                 }
 175                         }
 176
 177                         return data === undefined && parts[1] ?
 178                                 this.data( parts[0] ) :
 179                                 data;
 180
 181                 } else {
 182                         return this.each(function() {
 183                                 var $this = jQuery( this ), args = [ parts[0], value ];
 184
 185                                 $this.triggerHandler( "setData" + parts[1] + "!", args );
 186                                 jQuery.data( this, key, value );
 187                                 $this.triggerHandler( "changeData" + parts[1] + "!", args );
 188                         });
 189                 }
 190         },
 191
 192         removeData: function( key ) {
 193                 return this.each(function() {
 194                         jQuery.removeData( this, key );
 195                 });
 196         }
 197 });
 198
 199 })( jQuery );