ember computed in input value from each loop

i have a input element on ember, while the value is come from each condition

        <div class="form-group">
          <label class="col-sm-3 control-label">Judul </label>
          <div class="col-sm-9 input-group">
            
            <span class="input-group-btn">
              <a class="btn btn-default remove_detail" type="button" onclick=><i class="fa fa-times"></i></a>
            </span>
          </div>
        </div>

i just wanna "watch" while the input in value=item.title has change from ember computed. how to do that ?