本篇文章主要介绍了Yii2使用表单上传文件的实例代码,小编觉得挺不错的,现在分享给大家,也给大家做个参考。一起跟随小编过来看看吧

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 UploadedFile|Null 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。

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