条件校验器

有些情况下,需要启用或者禁用模型的指定验证规则。Yii2提供了一个机制来帮你做到这一点。

准备

按照官方指南http://www.yiiframework.com/doc-2.0/guide-start-installation.html的描述,使用Composer包管理器创建一个新的应用。

如何做...

  1. 创建一个表单文件@app/models/DeliveryForm.php
<?php
namespace app\models;
use app\components\WordsValidator;
use yii\base\Model;
class DeliveryForm extends Model
{
    const TYPE_PICKUP = 1;
    const TYPE_COURIER = 2;
    public $type;
    public $address;
    public function rules()
    {
        return [
            ['type', 'required'],
            ['type', 'in', 'range'=>[self::TYPE_PICKUP, self::TYPE_COURIER]],
            ['address', 'required', 'when' => function ($model)
            {
                return $model->type == self::TYPE_COURIER;
            }, 'whenClient' => "function (attribute, value) {return $('#deliveryform-type').val()=='".self::TYPE_COURIER."';}"]
        ];
    }
    public function typeList()
    {
        return [
            self::TYPE_PICKUP => 'Pickup',
            self::TYPE_COURIER => 'Courier delivery',
        ];
    }
}
  1. 创建一个控制器文件@app/controllers/ValidationController.php
<?php
namespace app\controllers;
use Yii;
use yii\web\Controller;
use app\models\DeliveryForm;
class ValidationController extends Controller
{
    public function actionIndex()
    {
        $model = new DeliveryForm();
        if ($model->load(Yii::$app->request->post()) && $model->validate()) {
            Yii::$app->session->setFlash('success',
                'The form was successfully processed!'
            );
        }
        return $this->render('index', array(
            'model' => $model,
        ));
    }
}
  1. 创建一个视图文件@app/views/validation/index.php
<?php
use yii\bootstrap\ActiveForm;
use yii\helpers\Html;
?>
    <h1>Delivery form</h1>
<?php if (Yii::$app->session->hasFlash('success')): ?>
    <div class="alert alert-success"><?= Yii::$app->session->getFlash('success'); ?></div>
<?php endif; ?>
<?php $form = ActiveForm::begin(); ?>
<?= $form->field($model, 'type')->dropDownList($model->typeList(), ['prompt'=>'Select delivery type']) ?>
<?= $form->field($model, 'address') ?>
    <div class="form-group">
        <?= Html::submitButton('Submit', ['class' => 'btn btn-primary']) ?>
    </div>
<?php ActiveForm::end(); ?>
  1. 运行validation控制器index.php?r=validation,选择courier delivery:

工作原理...

type属性被设置为DeliveryForm::TYPE_COURIER时,DeliveryForm address属性是必需的;否则是可选的。

此外,为了支持客户端条件验证,我们配置了whenClient属性,它使用了一个Javascript函数来决定是否应用这个规则。

参考

欲了解更多信息,参考http://www.yiiframework.com/doc-2.0/guideinputvalidation.html#conditional-validation

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