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abernier/jquery.segment.coffee

Created January 21, 2012 17:46
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$.fn.segment
Raw
jquery.segment.coffee
(($) ->
###
Grab a segment of a jQuery collection
* start: a zero-based index from which to grab
* width: the width of the segment (default: 1)
Examples:
| A | B | C | D | E | $myList
<-> .segment( 0)
<-----> .segment( 1, 2)
<-> .segment(-1)
<-------------> .segment(-1, 4)
###
$.fn.segment = (start, width = 1) ->
length = @length
end = undefined
width = Math.max(1, width)
width = Math.min(length, width)
if (start >= 0)
start = Math.min(length - width, start)
end = start + width;
else
start = Math.max(-length, start)
start = Math.min(-width, start)
end = start + width;
end = undefined if (end == 0)
@slice(start, end)
)(jQuery)
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Ex: http://jsfiddle.net/abernier/Lpcz8/4/

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