Example analysis of the usage of Yii2 frame dropDownList dropdown menu

This article describes the usage of the dropDownList drop-down menu of the Yii2 framework. Share it for your reference, as follows:

dropDownList is a dropdown function that comes with yii framework. We can directly use dropDownList to implement the select menu of html. Let’s take a look below.

Yii2.0's default dropdownlist usage method.

Copy the codeThe code is as follows:

<?php echo $form->field($model, 'name[]')->dropDownList(['a' => 'Item A', 'b' => 'Item B', 'c' => 'Item C']); ?>

Add the drop-down menu in yii2

Copy the codeThe code is as follows:

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

DropDownList is used in the model

<?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...']);
?>

The default value setting for the drop-down menu is used to use prompt keyword

Example:

Copy the codeThe code is as follows:

$form->field($searchmodel, 'moneytype')->dropDownList($soucetype, ['prompt' => 'Please select the amount source')])

OK. The default value setting of the drop-down menu is so simple. Let’s talk about how the default value of the text box with plug-in is set.

I will now take the two text fields that use the time plugin at the end of this form as an example. Here the prompt keyword is not possible. We need to use the placeholder keyword

Copy the codeThe code is as follows:

$form->field($searchmodel, 'startdate')->widget(DatePicker::className(),['clientOptions' => ['dateFormat' => 'yy-mm-dd']])->textInput(['placeholder' => Yii::t('app', 'Start time')])

The dropDownList method of ActiveForm class (advantage, the style of yii is used by default)
1. In the controller method, we need to get the data, which must be the data of the findAll() or all() method. Examples are as follows:

public function actionIndex()
{
    $model = new UserModel();
    $data = Customer::find()->all();
    return $this->render('index', [
      'model' => $model,
      'data' => $data,
    ]);
}

On the view page, we use yii's form generator.

Copy the codeThe code is as follows:

$form->field($model, 'username')->dropDownList(ArrayHelper::map($data,'id', 'customer_name'));

2.1. dropDownList          -->     yii2.0 Method of drop-down list
2.2. ArrayHelper::map()     -->     Construct a one-dimensional or multi-dimensional array of (key => value)
2.3.1. $data            -->     Data Source
2.3.2. id
2.3.3. Customer_name      --->       option tag value

The activeDropDownList method of the Html class (advantage, you can customize any style)

1. Just like the first step of the first method, get the data. But I have explained more.
2. The \yii\helpers\Html class provides us with the implementation method of the drop-down list activeDropDownList method

Copy the codeThe code is as follows:

Html::activeDropDownList($model, 'username', ArrayHelper::map($data,'id', 'customer_name'), ['style' => 'border:1px solid red;']);

I didn't write the php tag. I believe programmers who have written Sina blog know that after writing the php tag, the entire code has been filtered, so I copied the code and added the tag myself.

The parameters and parameters of the first method have the same meaning and will not be explained.

For more information about Yii, readers who are interested in this site can view the topic:Yii framework introduction and common techniques summary》、《Summary of excellent development framework for php》、《Basic tutorial on getting started with smarty templates》、《PHP object-oriented programming tutorial》、《Summary of usage of php strings》、《PHP+mysql database operation tutorial"and"Summary of common database operation techniques for php》

I hope that this article will be helpful to everyone's PHP programming based on the Yii framework.