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Refactor jQuery.data a bit to reduce property lookups

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- Also added jQuery.isEmptyObject
This commit is contained in:
Yehuda Katz 2009-07-16 07:32:31 +00:00
parent d36d224cc5
commit 190812c3be
2 changed files with 21 additions and 23 deletions
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6
src/core.js
View File

@ -291,6 +291,12 @@ jQuery.extend({
return this.constructor.call(obj) === Object; return this.constructor.call(obj) === Object;
}, },
isEmptyObject: function( obj ) {
var name = "";
for(name in obj) break;
return !name;
},
// check if an element is in a (or is an) XML document // check if an element is in a (or is an) XML document
isXMLDoc: function( elem ) { isXMLDoc: function( elem ) {
return elem.nodeType === 9 && elem.documentElement.nodeName !== "HTML" || return elem.nodeType === 9 && elem.documentElement.nodeName !== "HTML" ||

38
src/data.js
View File

@ -8,27 +8,24 @@ jQuery.extend({
windowData : windowData :
elem; elem;
var id = elem[ expando ]; var id = elem[ expando ], cache = jQuery.cache;
// Compute a unique ID for the element // Compute a unique ID for the element
if ( !id ) if(!id) id = elem[ expando ] = ++uuid;
id = elem[ expando ] = ++uuid;
// Only generate the data cache if we're // Only generate the data cache if we're
// trying to access or manipulate it // trying to access or manipulate it
if ( name && !jQuery.cache[ id ] ) if ( name && !cache[ id ] )
jQuery.cache[ id ] = {}; cache[ id ] = {};
var thisCache = cache[ id ];
// Prevent overriding the named cache with undefined values // Prevent overriding the named cache with undefined values
if ( data !== undefined ) if ( data !== undefined ) thisCache[ name ] = data;
jQuery.cache[ id ][ name ] = data;
if(name === true) return jQuery.cache[ id ] if(name === true) return thisCache
else if(name) return thisCache[name]
// Return the named cache data, or the ID for the element else return id
return name ?
jQuery.cache[ id ][ name ] :
id;
}, },
removeData: function( elem, name ) { removeData: function( elem, name ) {
@ -36,21 +33,16 @@ jQuery.extend({
windowData : windowData :
elem; elem;
var id = elem[ expando ]; var id = elem[ expando ], cache = jQuery.cache, thisCache = cache[ id ];
// If we want to remove a specific section of the element's data // If we want to remove a specific section of the element's data
if ( name ) { if ( name ) {
if ( jQuery.cache[ id ] ) { if ( thisCache ) {
// Remove the section of cache data // Remove the section of cache data
delete jQuery.cache[ id ][ name ]; delete thisCache[ name ];
// If we've removed all the data, remove the element's cache // If we've removed all the data, remove the element's cache
name = ""; if( jQuery.isEmptyObject(thisCache) )
for ( name in jQuery.cache[ id ] )
break;
if ( !name )
jQuery.removeData( elem ); jQuery.removeData( elem );
} }
@ -67,7 +59,7 @@ jQuery.extend({
} }
// Completely remove the data cache // Completely remove the data cache
delete jQuery.cache[ id ]; delete cache[ id ];
} }
}, },
queue: function( elem, type, data ) { queue: function( elem, type, data ) {