Yii2使用表单上传文件的实例代码

2018-09-07 13:27

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  yii2用表单上传文件经常用到的,该怎样上传呢?

  1、单个文件上传

  首先建立一个模型models/UploadForm.php,内容如下

   namespace app\models; use yii\base\Model; use yii\web\UploadedFile; /** * UploadForm is the model behind the upload form. */ class UploadForm extends Model { /** * @var UploadedFile file attribute */ public $file; /** * @return array the validation rules. */ public function rules() { return [ [[file], file], ]; } }

  再建立一个视图文件,内容如下

   <?php use yii\widgets\ActiveForm; ?> <?php $form = ActiveForm::begin([options => [enctype => multipart/form-data]]) ?> <?= $form->field($model, file)->fileInput() ?> <button>Submit</button> <?php ActiveForm::end() ?>

  最后建立控制器文件,内容如下

   namespace app\controllers; use Yii; use yii\web\Controller; use app\models\UploadForm; use yii\web\UploadedFile; class SiteController extends Controller { public function actionUpload() { $model = new UploadForm(); if (Yii::$app->request->isPost) { $model->file = UploadedFile::getInstance($model, file); if ($model->file && $model->validate()) { $model->file->saveAs(uploads/ . $model->file->baseName . . . $model->file->extension); } } return $this->render(upload, [model => $model]); } }

  注意这里我们没有用model->load(...),而是用了UploadedFile::getInstance(...)。区别是后者不会执行$model->validate(),所以需要手动的去执行$model->validate()来检验数据的合法性。如果检验通过了,上传的文件保存在uploads文件夹下,即web目录下的uploads里。

  一些可选的配置选项

  上传文件不能为空

   public function rules() { return [ [[file], file, skipOnEmpty => false], ]; }

  上传类型,不仅可以根据扩展名检验,还可以根据文件的内容进行检验

   public function rules() { return [ [[file], file, extensions => jpg, png, mimeTypes => image/jpeg, image/png,], ]; }

  2、多文件上传

  如果你想一次上传多个文件,只需调节几个参数就可以达到目的

  Model:

   class UploadForm extends Model { /** * @var UploadedFileNull file attribute */ public $file; /** * @return array the validation rules. */ public function rules() { return [ [[file], file, maxFiles => 10], // <--- here! ]; } }

  View:

   <?php use yii\widgets\ActiveForm; $form = ActiveForm::begin([options => [enctype => multipart/form-data]]); ?> <?= $form->field($model, file[])->fileInput([multiple => true]) ?> <button>Submit</button> <?php ActiveForm::end(); ?>

  与单文件上传不同的是下面这句

   $form->field($model, file[])->fileInput([multiple => true])

  Controller:

   namespace app\controllers; use Yii; use yii\web\Controller; use app\models\UploadForm; use yii\web\UploadedFile; class SiteController extends Controller { public function actionUpload() { $model = new UploadForm(); if (Yii::$app->request->isPost) { $model->file = UploadedFile::getInstances($model, file); if ($model->file && $model->validate()) { foreach ($model->file as $file) { $file->saveAs(uploads/ . $file->baseName . . . $file->extension); } } } return $this->render(upload, [model => $model]); } }

  这样就可以实现多文件上传了。

  参考

  以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。


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