How to implement the linkage event of dropDownList in Yii (code)

The content of this article is about how Yii implements the linkage event (code) of dropDownList. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Due to functional requirements, linkage needs to be used, hereby record and share

1. View

  = $form->field($model, 'cid')->dropDownList( \common\models\service\common\Category::getCateOptions(), [ 'prompt' => '请选择单位', 'onchange'=>' $.post("/carousel/main/cate?id='.'"+$(this).val(),function(data){ $("select#main-aid").html(data); });', ] )->hint('父级，必选') ?> = $form->field($model, 'aid')->dropDownList( \common\models\service\common\Category::getCateOptions(), ['prompt' => '请选择子级']) ?> 
 = Html::submitButton('Save', ['class' => 'btn btn-success']) ?> 
  

2. Controller

ublic function actionCate($id) { $departments = Category::find() ->where(['parent_id' => $id]) ->asArray() ->all(); if(!$departments){ echo "" . ""; } foreach ($departments as $department) { echo "" . $department['name'] . ""; } }

3. Realize the effect

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