解决了，我把相应的model,module,view,controller删除后重新做了一遍就好了

还有在这之上还用了一个datepicker,是不是datepicker影响到了js:this.value?

我的ajax提交出问题了，报HTTP 500可能是什么原因啊，说是Jquery.js 7829行有问题，该行的内容为

7826 // Do send the request
7827 // This may raise an exception which is actually
7828 // handled in jQuery.ajax (so no try/catch here)
7829 xhr.send( ( s.hasContent && s.data ) || null );
难道是Ajax中的data出问题了？

'ajax'=>array(                                                                                             'url'=>Yii::app()->createUrl('Issue/issue/dynamicProjectNumber'),
    'data'=>array( 'machine_sn' => 'js:this.value'),
    'update'=>'#Issue_project_number',
),

指向报错的地方是jquery.js的下面这段代码

// Do send the request
// This may raise an exception which is actually
// handled in jQuery.ajax (so no try/catch here)
xhr.send( ( s.hasContent && s.data ) || null );

PHP Error [2]

include(cHtml.php) [function.include]: failed to open stream: No such file or directory (D:\xampp\htdocs\X\framework\YiiBase.php:421)

#0 D:\xampp\htdocs\X\framework\YiiBase.php(421): CWebApplication->handleError()
#1 D:\xampp\htdocs\X\framework\YiiBase.php(421): autoload()
#2 unknown(0): autoload()
#3 D:\xampp\htdocs\X\yii_fox\protected\models\Issue.php(111): spl_autoload_call()
#4 D:\xampp\htdocs\X\yii_fox\protected\modules\Issue\controllers\IssueController.php(184): Issue->getProjectNumberList()
#5 unknown(0): IssueController->actionDynamicProjectNumber()
#6 D:\xampp\htdocs\X\framework\web\actions\CAction.php(104): ReflectionMethod->invokeArgs()
#7 D:\xampp\htdocs\X\framework\web\actions\CInlineAction.php(48): CInlineAction->runWithParamsInternal()
#8 D:\xampp\htdocs\X\framework\web\CController.php(300): CInlineAction->runWithParams()
#9 D:\xampp\htdocs\X\framework\web\filters\CFilterChain.php(134): IssueController->runAction()
#10 D:\xampp\htdocs\X\framework\web\filters\CFilter.php(41): CFilterChain->run()
#11 D:\xampp\htdocs\X\framework\web\CController.php(1144): CAccessControlFilter->filter()
#12 D:\xampp\htdocs\X\framework\web\filters\CInlineFilter.php(59): IssueController->filterAccessControl()
#13 D:\xampp\htdocs\X\framework\web\filters\CFilterChain.php(131): CInlineFilter->filter()
#14 D:\xampp\htdocs\X\framework\web\CController.php(283): CFilterChain->run()
#15 D:\xampp\htdocs\X\framework\web\CController.php(257): IssueController->runActionWithFilters()
#16 D:\xampp\htdocs\X\framework\web\CWebApplication.php(277): IssueController->run()
#17 D:\xampp\htdocs\X\framework\web\CWebApplication.php(136): CWebApplication->runController()
#18 D:\xampp\htdocs\X\framework\base\CApplication.php(158): CWebApplication->processRequest()
#19 D:\xampp\htdocs\X\yii_fox\index.php(13): CWebApplication->run()

然后在跑的时候能够执行actionDynamicProjectNumber,但是不能通过，会报错[attach]581[/attach]

老大帮我看看到底什么地方出问题了，我重新写过一遍你的DemoCity，细节都注意到，而且成功了。
但是想把这个结构应用到我这里来的时候就出问题了，报错PHP500

/*
 *  Give Dynamic Project Number List
 * 
 */
public function actionDynamicProjectNumber($machine_sn)
{
//    $model=Machine::model()->getMachineSnList();
      $model = Issue::model()->getProjectNumberList($machine_sn);
//    $model=Machine::model()->getMachineSnList1();               
         foreach($model as $value=>$name) 
         {
          echo CHtml::tag('option',array('value'=>$value),CHtml::encode($name),true);
                                     }
 }
<!-- machine _ s n drop down list-->
<div class="row">
<?php echo $form->labelEx($model,'machine_sn'); ?>
<?php 
     echo $form->dropDownList(
                   $model,
                   'machine_sn', 
                   Issue::model()->getMachineSnList(),
                   array(
                         'empty'=>'-请选择-',
                         'ajax'=>array(
                              'url'=>Yii::app()->createUrl('Issue/issue/dynamicProjectNumber'),                                                      
			      'data'=>array('machine_sn'=>'js:this.value'),
                              'update'=>'#Issue_project_number',
                               ),
                             )
                          );                                                
                                    ?>
<?php echo $form->error($model,'machine_sn'); ?>
</div>
array('allow',          // allow authenticated user to perform 'create' and 'update' actions
	 'actions'=>array('create','update','dynamicProjectNumber'),
	  'users'=>array('@'),
			), 
public function getMachineSnList () {
      $currMachineSnList=  Machine::model()->findAll();
      return cHtml::listData($currMachineSnList,'machine_sn','machine_sn');
       }
                 
 /*
  *  get Machine Project Number
  * 
  */
 public function getProjectNumberList ($machine_sn) {
       $currProjectNumber=  Machine::model()->findAllByAttributes(array('machine_sn'=>$machine_sn));
       return cHtml::listData($currProjectNumber,'machine_sn','project_number');
        }

谢谢舰长，先好好看看，再来问问

多谢舰长提醒，我看的就是这段代码，想改写，没改成功

为什么贴出来排版这么奇怪呢？
不管了，事情是这样的，这段代码是舰长在省份城市两级连动中的根据省份自动生成城市list的代码，用到了AJAX.我有以下几点不清楚，
a. 如果是module Issue中IssueController中的函数actionDynamicProjectNumber，是否应该改写成'url'=>Yii::app()->createUrl('Issue/issue/dynamicProjectNumber'),
b. 'update'=>'#Member_city',
是什么含义啊？