yii2框架中使用下拉菜单的自动搜索yii-widget-select2

github中源代码地址：https://github.com/kartik-v/yii2-widget-select2

利用composer.phar安装此插件：

php composer.phar require kartik-v/yii2-widget-select2 "*"

引用方法：

use kartikselect2Select2;

源代码：

 <?= $form->field($model, "companies_company_id")->widget(Select2::classname(), [
    "data" => ArrayHelper::map(Companies::find()->all(),"company_id","company_name"),
    "language" => "en",
    "options" => ["placeholder" => "Select a state ..."],
    "pluginOptions" => [
        "allowClear" => true
    ],
]); ?>

相关内容的详细解释：http://demos.krajee.com/widget-details/select2