Modification of jqDnR drag overflow based on jquery_jquery

Copy code The code is as follows:

/*
* jqDnR - Minimalistic Drag'n'Resize for jQuery.
*
* Copyright (c) 2007 Brice Burgess , http://www.iceburg.net/
* Licensed under the MIT License:
* http://www.opensource.org/licenses/mit-license.php
*
* $Version: 2007.08.19 r2
* last modified by leegle 2011.02.11
* fix bug: If you cannot come back after overflow, add moving within the range
*/
(function($) {
$.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') {
//Modified position Li Fei February 11, 2011 14:35:19
E .css({ left: (M.X v.pageX - M.pX)<0? 0:(M.X v.pageX - M.pX)}
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);