This is MooTools Plugin provides a countdown of text in an input field. Inspired by the way Twitter counts down the ramaining characters in a tweet.
window.addEvent('domready', function() {
new charCounter({
elem: 'myCounter',
count: 140,
target: 'myTextarea',
warnAt: 20,
alertAt: 10,
stopAtLimit: true,
description: ''
})
new charCounter({
elem: 'myCounter2',
count: 50,
target: 'myTextarea2',
warnAt: 20,
alertAt: 10,
stopAtLimit: true,
description: ''
})
});