Yii2下拉空选项

Question

如何将以下Yii代码实现到Yii2:

<?php 
   echo $form->dropDownList($model, 
                           'project', 
                           $model->getProjectOptions(), 
                           array('empty' => 'Empty string')
   ); 
?>

Answer 1

为什么不

dropDownList($model, 'project', $model->getProjectOptions(), array('prompt'=>'Empty string'); ?>

• prompt:string,一个提示文本作为第一个选项显示;

这是旧的CHtml https://github.com/yiisoft/yii2/blob/master/framework/yii/helpers/base/Html.php

如果您需要更多东西,可以在那里找到.

Answer 2

使用以下代码获取yii2朋友的下拉列表.

<?php 
    //use app\models\Country;
    $countries=Country::find()->all();

    //use yii\helpers\ArrayHelper;
    $listData=ArrayHelper::map($countries,'code','name');

    echo $form->field($model, 'name')->dropDownList(
                                    $listData, 
                                    ['prompt'=>'Select...']);
    ?>

Answer 3

试试这个:如果你愿意,你可以删除模板.

<?php
  $form = ActiveForm::begin([
    'id' => 'test-form',
    'options' => ['class' => 'form-horizontal'],
    'enableClientValidation'=> true,
    'enableAjaxValidation'=> false,
    'validateOnSubmit' => true,
    'validateOnChange' => true,
    'validateOnType' => true,
    'action' => Yii::$app->homeUrl . 'your/url/path'
  ]);
?>

    echo $form->field($model, 
                'your_field_name', 
                ['template' => '<div class="col-md-3">
                                     {label}
                                </div>
                               <div class="col-md-9"> 
                                     {input}{error}{hint}
                               </div>'
                ])
                ->dropdownList($option_array, ['prompt' => '--Select--']);

<?php ActiveForm::end(); ?>