$(document).ready(function(){
 /**
  * Character Counter for inputs and text areas showing characters left.
  */
 $('.conta_palavras').each(function(){
     //maximum limit of characters allowed.
     var maxlimit = 290;
     // get current number of characters
     var length = $(this).val().length;
     if(length >= maxlimit) {
   $(this).val($(this).val().substring(0, maxlimit));
   length = maxlimit;
  }
     // update count on page load
     $(this).parent().find('.contador').html( (maxlimit - length) + ' caracteres restantes.');
     // bind on key up event
     $(this).keyup(function(){
  // get new length of characters
  var new_length = $(this).val().length;
  if(new_length >= maxlimit) {
    $(this).val($(this).val().substring(0, maxlimit));
    //update the new length
    new_length = maxlimit;
   }
  // update count
  $(this).parent().find('.contador').html( (maxlimit - new_length) + ' caracteres restantes.');
     });
 });

});