yii2学习笔记 ---- Yii2上下联动下拉框功能

在模型上添加代码

public $grade;
public $userGrade=[
        '1'=>'等级1',
        '2'=>'等级2',
        '3'=>'等级3',
        '4'=>'等级4',
        '5'=>'等级5',
        '6'=>'等级6',
        '7'=>'等级7',
    ];
public function getUserGrade(){
        $arr=[];
        foreach ($this->userGrade as $key=>$value){
            $arr[]=['id'=>$key,'name'=>$value];
        }
        return \yii\helpers\ArrayHelper::map($arr,'id','name');
    }

控制器添加代码

public function actionCreate()
$model = new Model();
$userGrade = $model->getUserGrade();
return $this->render('create', [
            'userGrade' => $userGrade,
            'model' => $model
        ]);

视图

<?php echo $form->field($model, 'grade')->dropDownList($userGrade); ?>