基于jquery的jqDnR拖拽溢出的修改

目前只修改了左上角溢出。右边和下边还没修复！

/*
* jqDnR - Minimalistic Drag'n'Resize for jQuery.
*
* Copyright (c) 2007 Brice Burgess <[email protected]>, http://www.iceburg.net/
* Licensed under the MIT License:
* http://www.opensource.org/licenses/mit-license.php
*
* $Version: 2007.08.19 +r2
* last modified by leegle 2011.02.11
* fix bug:溢出之后不能回来的,添加在范围内移动
*/
(function($) {
$.fn.jqDrag = function(h) { return i(this, h, 'd'); };
$.fn.jqResize = function(h) { return i(this, h, 'r'); };
$.jqDnR = { dnr: {}, e: 0,
drag: function(v) {
if (M.k == 'd') {
//修改的位置 
E.css({ left: (M.X + v.pageX - M.pX)<0? 0:(M.X + v.pageX - M.pX)<document.documentElement.clientWidth- M.W?(M.X + v.pageX - M.pX):document.documentElement.clientWidth- M.W, top: (M.Y + v.pageY - M.pY)<0?0:(M.Y + v.pageY - M.pY)<document.documentElement.clientHeight -M.H ?(M.Y + v.pageY - M.pY): document.documentElement.clientHeight- M.H });
}
else {E.css({ width: Math.max(v.pageX - M.pX + M.W, 0), height: Math.max(v.pageY - M.pY + M.H, 0) }); return false;}
},
stop: function() { E.css('opacity', M.o); $(document).unbind('mousemove', J.drag).unbind('mouseup', J.stop); }
};
var J = $.jqDnR, M = J.dnr, E = J.e,
i = function(e, h, k) {
return e.each(function() {
h = (h) ? $(h, e) : e;
h.bind('mousedown', { e: e, k: k }, function(v) {
var d = v.data, p = {}; E = d.e;
// attempt utilization of dimensions plugin to fix IE issues
if (E.css('position') != 'relative') {
p = E.position();
if (!($.browser.msie && ($.browser.version == "6.0")) && (E.css('position') == 'fixed')) {
p.top -= $(window).scrollTop(); p.left -= $(window).scrollLeft()
}
}
M = { X: p.left || f('left') || 0, Y: p.top || f('top') || 0, W: f('width') || E[0].scrollWidth || 0, H: f('height') || E[0].scrollHeight || 0, pX: v.pageX, pY: v.pageY, k: d.k, o: E.css('opacity') };
E.css({ opacity: 0.8 }); $(document).mousemove($.jqDnR.drag).mouseup($.jqDnR.stop);
return false;
});
});
},
f = function(k) { return parseInt(E.css(k)) || false; };
})(jQuery);