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Reduced the number of function calls required for .find() (single element root), optimized some calls to jQuery() as well. Goes towards fixing #4240.

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This commit is contained in:
John Resig 2009-02-25 04:57:00 +00:00
parent 9c0ddfa2ad
commit 041fd5f2b5
1 changed files with 27 additions and 9 deletions
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36
src/core.js
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@ -22,7 +22,16 @@ var
jQuery.fn = jQuery.prototype = { jQuery.fn = jQuery.prototype = {
init: function( selector, context ) { init: function( selector, context ) {
// Make sure that a selection was provided // Make sure that a selection was provided
selector = selector || document; if ( selector === undefined ) {
selector = document;
}
// Handle "", null
if ( !selector ) {
this.length = 0;
this.context = document;
return this;
}
// Handle $(DOMElement) // Handle $(DOMElement)
if ( selector.nodeType ) { if ( selector.nodeType ) {
@ -31,6 +40,7 @@ jQuery.fn = jQuery.prototype = {
this.context = selector; this.context = selector;
return this; return this;
} }
// Handle HTML strings // Handle HTML strings
if ( typeof selector === "string" ) { if ( typeof selector === "string" ) {
// Are we dealing with HTML string or an ID? // Are we dealing with HTML string or an ID?
@ -40,17 +50,18 @@ jQuery.fn = jQuery.prototype = {
if ( match && (match[1] || !context) ) { if ( match && (match[1] || !context) ) {
// HANDLE: $(html) -> $(array) // HANDLE: $(html) -> $(array)
if ( match[1] ) if ( match[1] ) {
selector = jQuery.clean( [ match[1] ], context ); selector = jQuery.clean( [ match[1] ], context );
// HANDLE: $("#id") // HANDLE: $("#id")
else { } else {
var elem = document.getElementById( match[3] ); var elem = document.getElementById( match[3] );
// Handle the case where IE and Opera return items // Handle the case where IE and Opera return items
// by name instead of ID // by name instead of ID
if ( elem && elem.id != match[3] ) if ( elem && elem.id != match[3] ) {
return jQuery().find( selector ); return jQuery().find( selector );
}
// Otherwise, we inject the element directly into the jQuery object // Otherwise, we inject the element directly into the jQuery object
var ret = jQuery( elem || [] ); var ret = jQuery( elem || [] );
@ -61,13 +72,21 @@ jQuery.fn = jQuery.prototype = {
// HANDLE: $(expr, [context]) // HANDLE: $(expr, [context])
// (which is just equivalent to: $(content).find(expr) // (which is just equivalent to: $(content).find(expr)
} else } else if ( !context || context.nodeType ) {
return jQuery( context ).find( selector ); this[0] = context || document;
this.length = 1;
this.context = context;
return this.find( selector );
} else {
return (context.jquery ? context : jQuery( context )).find( selector );
}
// HANDLE: $(function) // HANDLE: $(function)
// Shortcut for document ready // Shortcut for document ready
} else if ( jQuery.isFunction( selector ) ) } else if ( jQuery.isFunction( selector ) ) {
return jQuery( document ).ready( selector ); return jQuery( document ).ready( selector );
}
// Make sure that old selector state is passed along // Make sure that old selector state is passed along
if ( selector.selector && selector.context ) { if ( selector.selector && selector.context ) {
@ -274,8 +293,7 @@ jQuery.fn = jQuery.prototype = {
find: function( selector ) { find: function( selector ) {
if ( this.length === 1 ) { if ( this.length === 1 ) {
var ret = this.pushStack( [], "find", selector ); var ret = this.pushStack( "", "find", selector );
ret.length = 0;
jQuery.find( selector, this[0], ret ); jQuery.find( selector, this[0], ret );
return ret; return ret;
} else { } else {