<p><span class="left" style="width: 100px;">经销商区域：</span><input type="text" class="tb" id="chldealerarea"  name="chldealerarea" value="${clubHotLeads.chldealerarea }" readonly="readonly"/>(只读)</p>
<p><span class="left" style="width: 100px;">经销商小区：</span><input type="text" class="tb" id="chlzonename" name="chlzonename" value="${clubHotLeads.chlzonename }" readonly="readonly"/>(只读)</p>

即使textbox只读，也能通过js来修改value 

function checkDealCode() {
    var chldealercode = $('chldealercode').value;
    var ajax = new Ajax.Request('checkDealCode.action', {
          method: 'post',
          parameters: {
            'chldealercode': chldealercode
          },
          onSuccess: function(transport){
              var json = transport.responseText.evalJSON() || false;
              if (json) {
                  if (json.msg) {
                      alert(json.msg);
                  } else {
                    $('chlzonename').setValue(json.chlzonename);
                    $('chldealerarea').setValue(json.chldealerarea);
                  }
              } else {
                  alert('数据获取失败。');
              }
          },
          onFailure: function(){
              alert('服务器连接失败。');
          }
      });
  }

后端JAVA:

//小区名
  private String chlzonename;
  //大区名
  private String chldealerarea;

两个属性的 get() set()

@Action(value = "checkDealCode",
      results={@Result(type = "json", name = SUCCESS)}
  )
  public String checkDealCode(){
    log.info("method begin:checkDealCode()");
    try{
      if (!StrUtils.checkEmpty(chldealercode)) {
        log.info("method end:checkDealCode()");
        return SUCCESS;
      }
      ClubDealer clubDealer = clubDealerMng.getClubDealerBySalecode(chldealercode);
      if (clubDealer == null) {
        msg = "此经销商CODE不存在。";
      } else {
        chlzonename = clubDealer.getClubDealerSmallArea().getDlzonename();
        chldealerarea = clubDealer.getDlaname();
      }
    } catch (DataAccessException ex) {
      log.error("", ex);
      msg = ex.getMessage();
    } catch (BusinessAccessException ex) {
      log.error("", ex);
      msg = ex.getMessage();
    } catch (Exception ex) {
      log.error("", ex);
      msg = ex.getMessage();
    } catch (Throwable ex) {
      log.error("", ex);
      msg = ex.getMessage();
    }
    log.info("method end:checkDealCode()");
    return Constants.SUCCESS;
  }