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php iframe实现无刷新文件上传(无需ajax)

Jun 13, 2016 am 11:26 AM
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本文章来介绍一下关于文件上传的方法,一个利用了php iframe来实现上传这个也是无刷新的哦,有需要的同学可以参考一下下哈。

首先ajax不能上传文件,这误导了我有段时间,今晚睡不着就照着说明做了个无刷新上传文件

其实原理很简单

 代码如下 复制代码


         
         


和一般的

标签相比多了一个target属性罢了,用于指定标签页在哪里打开以及提交数据。

如果没有设置该属性,就会像平常一样在本页重定向打开action中的url。

而如果设置为iframe的name值,即"upload"的话,就会在该iframe内打开,因为CSS设置为隐藏,因而不会有任何动静。若将display:none去掉,还会看到服务器的返回信息。

另外贴一下自己组织的类。

 代码如下 复制代码

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("并没有文件上传");
          
       $this->_file  = $_FILES[$name];
      
       if(!is_uploaded_file($this->_file['tmp_name']))
            throw new Exception("异常情况");
       if($this->_file['error'] !== 0)
            throw new Exception("错误代码:".$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($real_dir === false)
           throw new Exception("给定目录{$dir}不存在");
       if(!is_writable($real_dir))
           throw new Exception("给定目录{$dir}不可写");
       return $real_dir;
   }

}

调用示例:

 代码如下 复制代码

$inputName =  'uploadfile';
 // 即 中的name值,不填也行
$upload = new upload($inputName);
$new_dir = "/www";  // 将文件移动到的路径
$upload->moveTo($new_dir);


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