iframe adaptive height php+iframe implements hidden upload files without refreshing

First of all, ajax cannot upload files, which misled me for a while. I couldn’t sleep tonight so I followed the instructions and uploaded files without refreshing. In fact, the principle is very simple. Copy the code. The code is as follows:

< form enctype="multipart/form-data" method="POST" target="upload" action="http://localhost/class.upload.php" >

is similar to the general

tag There is just one more target attribute, which is used to specify where the tab page should be opened and data submitted.
If this attribute is not set, the URL in the action will be redirected and opened on this page as usual.
If it is set to the name value of the iframe, that is, "upload", it will be opened in the iframe. Because the CSS is set to hidden, there will be no movement. If you remove display:none, you will also see the return information from the server.
Also post the categories of your own organization.

Copy code

The code is as follows:

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("No file uploaded");
$this->_file = $_FILES[$name];
if(!is_uploaded_file($this->_file['tmp_name']))
throw new Exception("Exception");
if($this->_file['error '] !== 0)
throw new Exception("Error code:".$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($real_dir === false)
throw new Exception("The given directory {$dir} does not exist");
if(!is_writable( $real_dir))
throw new Exception("The given directory {$dir} is not writable");
return $real_dir;
}}


Call example:



Copy the code

The code is as follows:

$inputName = 'uploadfile'; // That is the name value in , you can leave it blank $upload = new upload($inputName); $new_dir = "/www"; // The path to move the file to $upload->moveTo($new_dir);

The above introduces the adaptive height of iframe using php+iframe to hide uploaded files without refreshing, including the adaptive height of iframe. I hope it will be helpful to friends who are interested in PHP tutorials.