jquery div resizer like stackoverflow one

I 开发者_C百科have a vertical only resizable div in my page. I'd like to put a handle "grip" like what there is in this page at the bottom of the textarea in the section "Your Answer". How can I do it?

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How about jQuery UI's resizable interaction?

$('some-selector').resizable({
    handles: 's',
    maxWidth: 300,
    minWidth: 300
});

Demo: http://jsfiddle.net/mattball/6H4Nc/

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The textarea comes with that functionality, but you could look into jQuery UI Resizable