About the multi-level linkage drop-down menu implemented by Yii

This article mainly introduces the multi-level linkage drop-down menu implemented by Yii, including the relevant implementation code of views, models and controllers, and involves related operation skills such as database query, array traversal and data display based on Yii. Friends in need You can refer to the example below

This article describes the multi-level linkage drop-down menu implemented by Yii. Share it with everyone for your reference, the details are as follows:

1. View file

<?php echo CHtml::activeDropDownList($model,&#39;zmg_id&#39;,MemGroup::model()->getMemGroup(),array(
    &#39;class&#39;=>&#39;s_ipt w_120&#39;,
    &#39;empty&#39;=>&#39;请选择会员组&#39;,
    &#39;ajax&#39; =>array(
          &#39;type&#39;=>&#39;GET&#39;,
          &#39;url&#39;=>CController::createUrl(&#39;cmpTemplates/getMemType&#39;),
          &#39;update&#39;=>&#39;#CmpTemplates_zmg_ids&#39;,
          &#39;data&#39;=>array(&#39;mid&#39;=>"js:this.value")
          ),
    ))?>
<?php echo $form->dropDownList($model,&#39;zmg_ids&#39;,array(),array(&#39;class&#39;=>&#39;s_ipt w_120&#39;,&#39;empty&#39;=>&#39;选择会员等级&#39;))?>

##2. Controller

/**
 * 获取会员组,对应的会员等级，用于下拉菜单
 */
public function actionGetMemType($mid=0)
{
  $criteria=new CDbCriteria;
  $criteria->compare('zmg_id',$mid);
  $memType = MemType::model()->findAll($criteria);
  $name = '选择会员等级';
  echo CHtml::tag('option', array('value'=>0), $name, true);
  foreach($memType as $val) {
    echo CHtml::tag('option', array('value'=>$val->zmt_id),CHtml::encode($val->zmt_title),true);
  }
}

3. Model

/*
* 取会员组信息
*/
public function getMemGroup($type=null){
  if($type==null){
    $criteria=new CDbCriteria;
    $criteria->compare('type','1');
    $memGroup = MemGroup::model()->findAll($criteria);
    return CHtml::listData($memGroup,'zmg_id','zmg_title');
  }else{
    $level = $this->getMemGroup();
    if(array_key_exists($type,$level)){
      return $level[$type];
    }
  }
}

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