Character countdown like on twitter

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Make a span and textarea and give them unique selectors (using an ID or class) like so:

<textarea class="message" rows="2" cols="30"></textarea>
<span class="countdown"></span>

And then make an update function like so:

function updateCountdown() {
    // 140 is the max message length
    var remaining = 140 - jQuery('.message').val().length;
    jQuery('.countdown').text(remaining + ' characters remaining.');
}

And make that function run when the page is loaded and whenever the message is changed:

jQuery(document).ready(function($) {
    updateCountdown();
    $('.message').change(updateCountdown);
    $('.message').keyup(updateCountdown);
});

Visit an example and view the source. jQuery makes things like this very simple.

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