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Added support for .eq(-N), .first(), and .last(). Fixes #2164 and #4188.

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This commit is contained in:
John Resig 2009-09-09 00:21:21 +00:00
parent 4ea4fad090
commit 9de120e6d7
2 changed files with 25 additions and 3 deletions
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12
src/traversing.js
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@ -78,7 +78,17 @@ jQuery.fn.extend({
},
eq: function( i ) {
return this.slice( i, +i + 1 );
return i === -1 ?
this.slice( i ) :
this.slice( i, +i + 1 );
},
first: function() {
return this.eq( 0 );
},
last: function() {
return this.eq( -1 );
},
slice: function() {

16
test/unit/traversing.js
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@ -203,7 +203,7 @@ test("prev([String])", function() {
});
test("slice()", function() {
expect(6);
expect(7);
var $links = jQuery("#ap a");
@ -213,8 +213,20 @@ test("slice()", function() {
isSet( $links.slice(-1), q("mark"), "slice(-1)" );
isSet( $links.eq(1), q("groups"), "eq(1)" );
isSet( $links.eq('2'), q("anchor1"), "eq('2')" );
isSet( $links.eq(-1), q("mark"), "eq(-1)" );
});
test("first()/last()", function() {
expect(4);
var $links = jQuery("#ap a"), $none = jQuery("asdf");
isSet( $links.first(), q("google"), "first()" );
isSet( $links.last(), q("mark"), "last()" );
isSet( $none.first(), [], "first() none" );
isSet( $none.last(), [], "last() none" );
});
test("map()", function() {