本文实例讲述了Yii2使用dropdownlist实现地区三级联动功能的方法。分享给大家供大家参考，具体如下：

视图部分：

<?php use yiihelpersUrl; use yiiwidgetsActiveForm; use yiihelpersArrayHelper; use yiihelpersHtml; /* @var $this yiiwebView */ /* @var $model commonsearchserviceItemSearch */ /* @var $form yiiwidgetsActiveForm */ ?> <div> <div> <?php $form = ActiveForm::begin([ 'action' => ['index'], 'method' => 'get', 'options' => ['class' => 'form-inline'] ]); ?> <?= $form->field($model, 'cityName', ['options' => ['class' => 'form-group col-lg-2']])->dropDownList(ArrayHelper::map($cities, 'id', 'name'), ['prompt' => '请选择城市'])->label('请选择城市', ['class' => 'sr-only']) ?> <?= $form->field($model, 'areaName', ['options' => ['class' => 'form-group col-lg-2']])->dropDownList(ArrayHelper::map($areas, 'id', 'name'), ['prompt' => '请选择区县'])->label('请选择区县', ['class' => 'sr-only']) ?> <?= $form->field($model, 'communityName', ['options' => ['class' => 'form-group col-lg-2']])->dropDownList(ArrayHelper::map($communities, 'id', 'name'), ['prompt' => '请选择小区'])->label('请选择小区', ['class' => 'sr-only']) ?> <div> <input id="keyword" placeholder="请输入小区名" value="" /> </div> <div> <button type="button" id="search-community">搜索</button> </div> <p></p> <div> <?= Html::submitButton('搜索', ['class' => 'btn btn-primary']) ?> </div> <?php ActiveForm::end(); ?> </div> </div> <p></p> <?php $this->registerJs(' //市地址改变 $("#itemsearch-cityname").change(function() { //市id值 var cityid = $(this).val(); $("#itemsearch-areaname").html("<option value="0">请选择区县</option>"); $("#itemsearch-communityname").html("<option value="0">请选择小区</option>"); if (cityid > 0) { getArea(cityid); } }); //区地址改变 $("#itemsearch-areaname").change(function() { //区id值 var areaid = $(this).val(); $("#itemsearch-communityname").html("<option value="0">请选择小区</option>"); if (areaid > 0) { getCommunity(areaid); } }); //获取市下面的区列表 function getArea(id) { var href = "' . Url::to(['/service/base/get-area-list'], true). '"; $.ajax({ "type" : "GET", "url" : href, "data" : {id : id}, success : function(d) { $("#itemsearch-areaname").append(d); } }); } //获取区下面的小区列表 function getCommunity(id) { var href = "' . Url::to(['/service/base/get-community-list'], true) . '"; $.ajax({ "type" : "GET", "url" : href, "data" : {id : id}, success : function(d) { $("#itemsearch-communityname").append(d); } }); } //搜索小区 $("#search-community").click(function() { var word = $("#keyword").val(); var areaid = $("#itemsearch-areaname option:selected").val(); var href = "' . Url::to(['/service/base/search-community'], true) . '"; if (areaid > 0) { $.ajax({ "type" : "GET", "url" : href, "data" : {id : areaid, word : word}, success : function(d) { $("#itemsearch-communityname").html(d); } }); } }); '); ?>

模型部分：

就是我们常用的ajax请求,当然php中需要直接组合成<option value=""></option>这样的结构直接用,$form->field($model, $var)中的变量数据表中不一定有,得在模型中自己定义,并设置安全字段,而且搜索模型也可能需要修改成自己需要的样子,模型可能要这样：

class HuangYeError extends yiidbActiveRecord { public $cityName; public $areaName; public $communityName; public $group; public $cate; /** * @inheritdoc */ public static function tableName() { return 'll_hy_huangye_error'; } public static function getDb() { return Yii::$app->get('dbnhuangye'); } }

之前是多表,需要使用jjoinWith()连表,后来被我全部转化为单表了,多表实在是慢,能转化成单表就用单表吧：

class HuangYeErrorSearch extends HuangYeError { const PAGE_SIZE = 20; public $communityName; public $startTime; public $endTime; /** * @inheritdoc */ public function rules() { return [ [['id', 'serviceid', 'userid', 'categoryid', 'communityid', 'sortorder', 'ctime', 'utime', 'status'], 'integer'], [['username', 'name', 'logo', 'phone', 'address', 'content', 'error', 'communityName', 'startTime', 'endTime'], 'safe'], ]; } /** * @inheritdoc */ public function scenarios() { // bypass scenarios() implementation in the parent class return Model::scenarios(); } /** * Creates data provider instance with search query applied * * @param array $params * * @return ActiveDataProvider */ public function search($params) { $query = HuangYeError::find(); //status == 9 删除状态 $condition = ' `status` != :status'; $p[':status'] = 9; $query->where($condition, $p); $dataProvider = new ActiveDataProvider([ 'query' => $query, 'pagination' => [ 'pageSize' => self::PAGE_SIZE, ], ]); $this->load($params); if (!$this->validate()) { // uncomment the following line if you do not want to any records when validation fails // $query->where('0=1'); return $dataProvider; } $query->andFilterWhere([ 'userid' => $this->userid ]); $query->andFilterWhere(['like', 'username', $this->username]) ->andFilterWhere(['like', 'name', $this->name]) ->andFilterWhere(['like', 'phone', $this->phone]) ->andFilterWhere(['like', 'address', $this->address]) ->andFilterWhere(['like', 'content', $this->content]) ->andFilterWhere(['ll_hy_huangye_error.status' => $this->status]) ->andFilterWhere(['ll_hy_huangye_error.categoryid' => $this->categoryid]) ->andFilterWhere(['between', 'ctime', strtotime($this->startTime . '0:0:0'), strtotime($this->endTime . '23:59:59')]) ->andFilterWhere(['like', 'error', $this->error]); if (intval($this->communityName)) { $query->andFilterWhere(['ll_hy_huangye_error.communityid' => intval($this->communityName)]); } $order = ' `ctime` DESC'; $query->orderBy($order); return $dataProvider; } }

控制器中写比较简单一点,直接调用就行了：

/** * ajax请求小区 * * @param $id * @return string */ public function actionGetCommunityList($id) { $option = ''; $result = self::getCommunity($id); if ($result) { foreach ($result as $value) { $option .= '<option value="' . $value['id'] . '">' . $value['name'] . '</option>'; } } else { $option .= '<option value="0">暂未开通可选择的小区</option>'; } echo $option; }

希望本文所述对大家基于Yii框架的PHP程序设计有所帮助。