Pasted

$('textarea').on('keypress change blur',function(e)
{
    var tval = $('textarea').val(),
        tlength = tval.length,
        set = 250, // max chars number
        remain = parseInt(set-tlength);
    $('.remain').text(remain);
    if (remain<=0 && e.which!==0 && e.charCode!==0)
        $('textarea').val((tval).substring(0,tlength-1))
})