Yii2 implements three-level linkage examples of provinces and municipalities in China

Yii2 realizes the three-level linkage instance of China's provinces and municipalities

Installation

Add to your composer.json file

"chenkby/yii2-region": "dev-master"

Switch to the project Directory

composer update;

3. Configuration

1) Add the following method in the model of the region

public static function getRegion($parentId=0)
{
  $result = static::find()->where(['parent_id'=>$parentId])->asArray()->all();
  return ArrayHelper::map($result, 'id', 'name');
}

2) In the controller Add the following action

public function actions()
{
  $actions=parent::actions();
  $actions['get-region']=[
    'class'=>\chenkby\region\RegionAction::className(),
    'model'=>\app\models\Region::className()
  ];
  return $actions;
}

3) Add enablePrettyUrl of urlManager in main.php in common/config, that is, hide index.php

"urlManager" => [ 
  //用于表明urlManager是否启用URL美化功能，在Yii1.1中称为path格式URL， 
  // Yii2.0中改称美化。 
  // 默认不启用。但实际使用中，特别是产品环境，一般都会启用。 
  "enablePrettyUrl" => true, 
  // 是否启用严格解析，如启用严格解析，要求当前请求应至少匹配1个路由规则， 
  // 否则认为是无效路由。 
  // 这个选项仅在 enablePrettyUrl 启用后才有效。 
  "enableStrictParsing" => false, 
  // 是否在URL中显示入口脚本。是对美化功能的进一步补充。 
  "showScriptName" => false, 
  // 指定续接在URL后面的一个后缀，如 .html 之类的。仅在 enablePrettyUrl 启用时有效。 
  "suffix" => "", 
  "rules" => [   
    "<controller:\w+>/<id:\d+>"=>"<controller>/view",
    "<controller:\w+>/<action:\w+>"=>"<controller>/<action>" 
  ],
],

4. Use

<?= $form->field($model, &#39;district&#39;)->widget(\chenkby\region\Region::className(),[
  &#39;model&#39;=>$model,
  &#39;url&#39;=> \yii\helpers\Url::toRoute([&#39;get-region&#39;]),
  &#39;province&#39;=>[
    &#39;attribute&#39;=>&#39;province&#39;,
    &#39;items&#39;=>Region::getRegion(),
    &#39;options&#39;=>[&#39;class&#39;=>&#39;form-control form-control-inline&#39;,&#39;prompt&#39;=>&#39;选择省份&#39;]
  ],
  &#39;city&#39;=>[
    &#39;attribute&#39;=>&#39;city&#39;,
    &#39;items&#39;=>Region::getRegion($model[&#39;province&#39;]),
    &#39;options&#39;=>[&#39;class&#39;=>&#39;form-control form-control-inline&#39;,&#39;prompt&#39;=>&#39;选择城市&#39;]
  ],
  &#39;district&#39;=>[
    &#39;attribute&#39;=>&#39;district&#39;,
    &#39;items&#39;=>Region::getRegion($model[&#39;city&#39;]),
    &#39;options&#39;=>[&#39;class&#39;=>&#39;form-control form-control-inline&#39;,&#39;prompt&#39;=>&#39;选择县/区&#39;]
  ]
]);
?>

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