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暗藏iframe无刷新上传文件

Jun 13, 2016 pm 12:28 PM
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隐藏iframe无刷新上传文件

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

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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。

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class upload<br>{<br>   public $_file;<br><br>   public function __construct( $name =null)<br>   {<br>       if(is_null($name) || !isset($_FILES[$name]))<br>            $name = key($_FILES);<br>            <br>       if(!isset($_FILES[$name]))<br>           throw new Exception("并没有文件上传");<br>           <br>       $this->_file  = $_FILES[$name];<br>       <br>       if(!is_uploaded_file($this->_file['tmp_name']))<br>            throw new Exception("异常情况");<br>       if($this->_file['error'] !== 0)<br>            throw new Exception("错误代码:".$this->_file['error']);     <br>   }<br>   public function moveTo( $new_dir)<br>   {<br>       $real_dir = $this->checkDir($new_dir);<br>       return move_uploaded_file($this->_file['tmp_name'], $real_dir.'/'.$this->_file['name']);<br>   }<br>   private function checkDir($dir)<br>   {<br>       $real_dir = realpath($dir);<br>       if($real_dir === false)<br>           throw new Exception("给定目录{$dir}不存在");<br>       if(!is_writable($real_dir))<br>           throw new Exception("给定目录{$dir}不可写");<br>       return $real_dir;<br>   }
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}
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调用示例:

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