问如何将jQuery ()隔离到起始元素的父容器的子容器中

EN

jQuery(document).ready(function(){

        //iterate through each textboxes and add keyup
        //handler to trigger sum event
        jQuery("#tab-5 input.text.long-field").each(function() {

            jQuery(this).keyup(function(){
                calculateSum();
            });
        });

    });

    function calculateSum() {

        var sum = 0;
        //iterate through each textboxes and add the values
        jQuery("#tab-5 input.text.long-field").each(function() {

            //add only if the value is number
            if(!isNaN(this.value) && this.value.length!=0 && this.id !== "customfield_11071") {
                sum += parseFloat(this.value);
            }

        });
        //.toFixed() method will roundoff the final sum to 2 decimal places
        jQuery("#customfield_11071").val(sum.toFixed(2));
    }

  <div class="tabs-pane active-pane" id="tab-5">
    <div class="field-group">
      <label for="customfield_12370">
        Test Case Estimate
      </label>
      <input class="text long-field" id="customfield_12370" name="customfield_12370" type="text" value="">
      <div class="description">
        Will hold all QA estimates for Test Case preparation/creation efforts.
      </div>
    </div>
    <div class="field-group">
      <label for="customfield_12371">
        Test Analysis Estimate
      </label>
      <input class="text long-field" id="customfield_12371" name="customfield_12371" type="text" value="">
      <div class="description">
        Will hold all QA estimates for testing analysis efforts.
      </div>
    </div>
    <div class="field-group">
      <label for="customfield_11071">
        QA Estimate Total
      </label>
      <input class="text long-field" id="customfield_11071" name="customfield_11071" type="text" value="">
      <div class="description">
        Estimated LOE in Hours
      </div>
    </div>
  </div>