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Add back ID shortcut. It's about 3 times faster than going through jQuery.fn.find and merging.

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This commit is contained in:
timmywil
2012-07-01 15:35:50 -05:00
parent f18b75940e
commit f71a6ec6cf
1 changed files with 40 additions and 14 deletions
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54
src/core.js
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@@ -39,7 +39,7 @@ var
// A simple way to check for HTML strings
// Prioritize #id over <tag> to avoid XSS via location.hash (#9521)
rhtmlString = /^(?:[^#<]*(<[\w\W]+>)[^>]*$)/,
rquickExpr = /^(?:[^#<]*(<[\w\W]+>)[^>]*$|#([\w\-]*)$)/,
// Match a standalone tag
rsingleTag = /^<(\w+)\s*\/?>(?:<\/\1>)?$/,
@@ -79,8 +79,8 @@ jQuery.fn = jQuery.prototype = {
init: function( selector, context, rootjQuery ) {
var match, elem, ret, doc;
// Handle $(""), $(null), $(undefined), $(false), or $("#") for location.hash
if ( !selector || selector === "#" ) {
// Handle $(""), $(null), $(undefined), $(false)
if ( !selector ) {
return this;
}
@@ -98,22 +98,48 @@ jQuery.fn = jQuery.prototype = {
match = [ null, selector, null ];
} else {
match = rhtmlString.exec( selector );
match = rquickExpr.exec( selector );
}
// HANDLE: $(html) -> $(array)
if ( match && match[1] ) {
context = context instanceof jQuery ? context[0] : context;
doc = ( context && context.nodeType ? context.ownerDocument || context : document );
// Match html or make sure no context is specified for #id
if ( match && (match[1] || !context) ) {
// scripts is true for back-compat
selector = jQuery.parseHTML( match[1], doc, true );
if ( rsingleTag.test( match[1] ) && jQuery.isPlainObject( context ) ) {
this.attr.call( selector, context, true );
// HANDLE: $(html) -> $(array)
if ( match[1] ) {
context = context instanceof jQuery ? context[0] : context;
doc = ( context && context.nodeType ? context.ownerDocument || context : document );
// scripts is true for back-compat
selector = jQuery.parseHTML( match[1], doc, true );
if ( rsingleTag.test( match[1] ) && jQuery.isPlainObject( context ) ) {
this.attr.call( selector, context, true );
}
return jQuery.merge( this, selector );
// HANDLE: $(#id)
} else {
elem = document.getElementById( match[2] );
// Check parentNode to catch when Blackberry 4.6 returns
// nodes that are no longer in the document #6963
if ( elem && elem.parentNode ) {
// Handle the case where IE and Opera return items
// by name instead of ID
if ( elem.id !== match[2] ) {
return rootjQuery.find( selector );
}
// Otherwise, we inject the element directly into the jQuery object
this.length = 1;
this[0] = elem;
}
this.context = document;
this.selector = selector;
return this;
}
return jQuery.merge( this, selector );
// HANDLE: $(expr, $(...))
} else if ( !context || context.jquery ) {
return ( context || rootjQuery ).find( selector );