when the form is submitted, the form should submit empty values for the input elements with empty values

jquery-clearinput_empty_submit.js

// note: this is not tested, but gives you the idea :-)

// for a normal html form:
$('form').submit(function(){
  $(this).find('input.clear-input').each(function(i, elt){
    // for each clear-input field
    if ($(elt).val() === $(elt).initialValue()) {
      // value has not changed
      // empty the value
      $(elt).val('');
    }
  }
});