These examples show how to apply a floating (default) and pinned Resizable component to a standard element.
Note that the js is not minified so it is readable. See basic.js for the full source code.
    Basic Example
    This is a basic as you get. To resize the box, position your mouse anywhere near the bottom,
    right or border right edge of the box. This example uses the default "floating" handles.
var basic = new Ext.Resizable('basic', {
        width: 200,
        height: 100,
        minWidth:100,
        minHeight:50
});
    Wrapped Elements
    Some elements such as images and textareas don't allow child elements. In the past, you had
    to wrap these elements and set up a Resizable with resize child. Resizable will
    wrap the element, calculate adjustments for borders/padding and offset the handles for you. All you have to
    do is set "wrap:true". The manual way of specifying a "resizeChild" is still supported as well.
    Pinned Handles
    Notice this example has the resize handles "pinned". This is done by setting "pinned:true".
    Dynamic Sizing
    If you don't like the proxy resizing, you can also turn on dynamic sizing. Just set "dynamic:true".
Here's a textarea that is wrapped, has pinned handles and has dynamic sizing turned on.
var dwrapped = new Ext.Resizable('dwrapped', {
    wrap:true,
    pinned:true,
    width:450,
    height:150,
    minWidth:200,
    minHeight: 50,
    dynamic: true
});
Preserve Ratio
    For some things like images, you will probably want to preserve the ratio of width to height. Just set preserveRatio:true.
 
var wrapped = new Ext.Resizable('wrapped', {
    wrap:true,
    pinned:true,
    minWidth:50,
    minHeight: 50,
    preserveRatio: true
});
Transparent Handles
    If you just want the element to be resizable without any fancy handles, set transparent to true.
 
var transparent = new Ext.Resizable('transparent', {
    wrap:true,
    minWidth:50,
    minHeight: 50,
    preserveRatio: true,
    transparent:true
});
    Customizable Handles
    Resizable elements are resizable 8 ways. 8 way resizing for a static positioned element will cause the element to be positioned relative and taken out of the document flow. For resizing which adjusts the
    x and y of the element, the element should be positioned absolute. You can also control which handles are displayed by setting the "handles" attribute.
    The handles are styled using CSS so they can be customized to look however you would like them to. 
    This image has 8 way resizing, custom handles, is draggable and 8 way preserved ratio (that wasn't easy!).
    Double click anywhere on the image to hide it when you are done.
 
var custom = new Ext.Resizable('custom', {
    wrap:true,
    pinned:true,
    minWidth:50,
    minHeight: 50,
    preserveRatio: true,
    dynamic:true,
    handles: 'all', // shorthand for 'n s e w ne nw se sw'
    draggable:true
});
    Snapping
    Resizable also supports basic snapping in increments. 
var snap = new Ext.Resizable('snap', {
    pinned:true,
    width:250,
    height:100,
    handles: 'e',
    widthIncrement:50,
    minWidth: 50,
    dynamic: true
});
    Animated Transitions
    Resize operations can also be animated. Animations support configurable easing and duration.
    Here's a very basic clone of the first element, but with animation turned on. I used a "backIn"
    easing and made it a little slower than default.
var animated = new Ext.Resizable('animated', {
    width: 200,
    height: 100,
    minWidth:100,
    minHeight:50,
    animate:true,
    easing: 'backIn',
    duration:.6
});