Display The Drop Down List Value Automatically In Update By Ajax

Yii 1.1 General Discussion
1

hi, i tried to apply the n level drop down list based on this link.


echo CHtml::dropDownList('CycleID','', CHtml::listData(Usersectionsecurity::model()->findAll(), 'Group_Code', 'E_Group_Desc'),

			array(

				'prompt'=>'Select Cycle',

					'ajax' => array(

						'type'=>'POST', //request type

						'url'=>CController::createUrl('Usersectionsecurity/getClassByCycle'), //url to call.

						'update'=>'#stclass', 

					)

				));			


			echo CHtml::dropDownList('stclass', '', array(), 

			array(

				'prompt'=>'Select Class',

					'ajax' => array(

						'type'=>'POST', //request type

						'url'=>CController::createUrl('Assignment/getStudentByClass'), //url to call.

						'update'=>'#'.CHtml::activeId($model,'studentID'), 

					)));

					

			echo $form->dropDownList($model,'studentID',array(), array('empty'=>'Select Student'));

the code is working fine, when i select the cycle, automatically the appropriate value of the classes including in this cycle are displayed. for example if i select the cycle 1 from cycle list, class grade 1, 2,… appears and grade 1 at the top.

to get the student of the grade 1, i have to select another value from the list and then re-select grade 1 to make the student name appears in the list.

why this? can anyone give me a solution. is there is select instead of update or something else?

thank you…

2

make the first value as “‘prompt’=>‘Select Class’,”

this should be in the controller action as first value

3

example




public function actionLoadcities()

{

   $data=RegionCity::model()->findAll('region_id=:region_id', 

   array(':region_id'=>(int) $_POST['region_id']));

 

   $data=CHtml::listData($data,'id','city_name');

 

   echo "<option value=''>Select City</option>";

   foreach($data as $value=>$city_name)

   echo CHtml::tag('option', array('value'=>$value),CHtml::encode($city_name),true);

}

note this line




echo "<option value=''>Select City</option>";
4

it works, thank you

5

thank you