隱藏iframe無刷新上傳文件，iframe刷新上傳文件

隱藏iframe無刷新上傳文件，iframe刷新上傳文件

首先ajax不能上傳文件，這誤導了我有段時間，今晚睡不著就照著說明做了個無刷新上傳文件

其實原理很簡單

<form enctype="multipart/form-data" method="POST" target="upload" action="http://localhost/class.upload.php" >
          <input type="file" name="uploadfile" />
          <input type="submit" /> 
</form>
<iframe name="upload">
class upload
{
   public $_file;

   public function __construct( $name =null)
   {
       if(is_null($name) || !isset($_FILES[$name]))
            $name = key($_FILES);
            
       if(!isset($_FILES[$name]))
           throw new Exception("並沒有文件上傳");
           
       $this->_file  = $_FILES[$name];
       
       if(!is_uploaded_file($this->_file['tmp_name']))
            throw new Exception("異常情況");
       if($this->_file['error'] !== 0)
            throw new Exception("錯誤代碼:".$this->_file['error']);     
   }
   public function moveTo( $new_dir)
   {
       $real_dir = $this->checkDir($new_dir);
       return move_uploaded_file($this->_file['tmp_name'], $real_dir.'/'.$this->_file['name']);
   }
   private function checkDir($dir)
   {
       $real_dir = realpath($dir);
       if($real_dir === false)
           throw new Exception("給定目錄{$dir}不存在");
       if(!is_writable($real_dir))
           throw new Exception("給定目錄{$dir}不可寫");
       return $real_dir;
   }
}


調用示例：

$inputName =  'uploadfile'; 
 // 即<input type=“file" name="uploadfile" /> 中的name值，不填也行
$upload = new upload($inputName);
$new_dir = "/www";  // 將文件移動到的路徑
$upload->moveTo($new_dir);