yii2 上传图片的示例代码

第一步： 搭建上传类基础工作，具体请看：//www.jb51.net/article/120242.htm

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frontend/web/css

.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 frontend/web/assets

$(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frontend/assets/AppAsset.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 = [    'yii/web/YiiAsset',    'yii/bootstrap/BootstrapAsset',  ];}

UploadController.php

<?PHPnamespace frontend/controllers;use Yii;use yii/web/Controller;use app/models/UploadForm;use yii/web/UploadedFile;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

<?PHPnamespace 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'],    ];  }}?>