Resizable grid

by Yusril Maulidan Raji

HTML

<script src="https://code.jquery.com/jquery-1.7.2.min.js"></script>
<script src="https://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.23/jquery-ui.min.js"></script>
<link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.23/themes/base/jquery-ui.css">
<div id="header">
</div>
<div id="body">
</div>
<div id="footer">
</div>

CSS

#header, #body, #footer{
  height:100px;
  width:100px;
  border-style: solid;
}

JavaScript

$.ui.plugin.add("resizable", "alsoResizeReverse", {

        start: function(event, ui) {

            var self = $(this).data("resizable"), o = self.options;

            var _store = function(exp) {
                $(exp).each(function() {
                    $(this).data("resizable-alsoresize-reverse", {
                        width: parseInt($(this).width(), 10), height: parseInt($(this).height(), 10),
                        left: parseInt($(this).css('left'), 10), top: parseInt($(this).css('top'), 10)
                    });
                });
            };

            if (typeof(o.alsoResizeReverse) == 'object' && !o.alsoResizeReverse.parentNode) {
                if (o.alsoResizeReverse.length) { o.alsoResize = o.alsoResizeReverse[0];    _store(o.alsoResizeReverse); }
                else { $.each(o.alsoResizeReverse, function(exp, c) { _store(exp); }); }
            }else{
                _store(o.alsoResizeReverse);
            }
        },

        resize: function(event, ui){
            var self = $(this).data("resizable"), o = self.options, os = self.originalSize, op = self.originalPosition;

            var delta = {
                height: (self.size.height - os.height) || 0, width: (self.size.width - os.width) || 0,
                top: (self.position.top - op.top) || 0, left: (self.position.left - op.left) || 0
            },

            _alsoResizeReverse = function(exp, c) {
                $(exp).each(function() {
                    var el = $(this), start = $(this).data("resizable-alsoresize-reverse"), style = {}, css = c && c.length ? c : ['width', 'height', 'top', 'left'];

                    $.each(css || ['width', 'height', 'top', 'left'], function(i, prop) {
                        var sum = (start[prop]||0) - (delta[prop]||0);
                        if (sum && sum >= 0)
                            style[prop] = sum || null;
                    });

                    //Opera fixing relative position
                    if...