yii2 上传图片的示例代码

第一步： 搭建上传类基础工作

第二步：建站一个product表，字段id,name,picurl.

第三步：生GII生成PRODUCT 模型，类，视图。

第四步：

main.css 放在frontendwebcss

  .onedialog{position:absolute; left: 300px; top: 500px; z-index: 10; width: 700px; height: 400px;border-radius:5px;box-shadow:5px 2px 6px #000; border: 2px solid #666}  .oneiframe{ width: 100%; height: 100% }

main.js 放在 frontendwebassets

  $(function(){   $('#product-picurl').click(function(){   $('#oneupload').remove();   $('<div>').appendTo($('body')).attr({"class":"onedialog",'id':"oneupload"});   $('<iframe>').appendTo($('#oneupload')).attr({"src":"?r=upload","class":"oneiframe"})   });    var v=$('#product-picurl').val();   if(v){   $('<img>').attr({"src":v,"style":"height:50px"}).insertAfter($('#product-picurl'));   }  });

然后在frontendassetsAppAsset.php中注册这两个文件

  class AppAsset extends AssetBundle  {    public $basePath = '@webroot';    public $baseUrl = '@web';    public $css = [      'css/site.css',      'css/main.css',    ];    public $js = [      'assets/main.js'    ];    public $depends = [      'yiiwebYiiAsset',      'yiibootstrapBootstrapAsset',    ];  }

UploadController.php

  <?PHP  namespace frontendcontrollers;    use Yii;  use yiiwebController;  use appmodelsUploadForm;  use yiiwebUploadedFile;    class UploadController extends Controller  {    public function actionIndex()    {      $model = new UploadForm();        if (Yii::$app->request->isPost) {        $model->file = UploadedFile::getInstance($model, 'file');          if ($model->file && $model->validate()) {          //$model->file->saveAs('uploads/' . $model->file->baseName . '.' . $model->file->extension);                $fileName='uploads/' . date("YmdHis") . '.' . $model->file->extension;          $model->file->saveAs($fileName);        }        echo "<script src='assets/upload.js'></script>;";        echo "<script>";        echo "var oneinput=parent.document.getElementById('product-picurl');";        echo "parent.document.getElementById('product-picurl').value='".$fileName."';";        echo "var oneupload = parent.document.getElementById('oneupload');";        echo "var img = document.createElement('img');";        echo "img.setAttribute('style', 'height:50px');";        echo "img.src ='".$fileName."';";        echo "insertAfter(img,oneinput);";        echo "oneupload.parentNode.removeChild(oneupload)";        echo "</script>";      }        return $this->render('upload', ['model' => $model]);    }  }  ?>

UploadForm.php

  <?PHP  namespace appmodels;    use yiibaseModel;  use yiiwebUploadedFile;    /**   * 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'],      ];    }  }  ?>

upload.php

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