yii2 怎么上传图片

第一步：搭建上传类基础工作，具体请看：http://www.yiichina.com/tutorial/328

第二步：建站一个product表，字段id,name,picurl.

第三步：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() ?>

PHP中文网，有大量免费的Yii入门教程，欢迎大家学习！