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：

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

<?php
namespace 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

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

upload.php

<?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() ?>

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。