Integrating ajax-upload with CodeIgniter

mycontroller.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');



class Mycontroller extends Controller {
	
	
	function __construct()
		{


           }



function myuploader(){
		
	$this->load->library('qquploadedfilexhr');
	
	// list of valid extensions, ex. array("jpeg", "xml", "bmp")
	$allowedExtensions = array('png', 'jpeg', 'jpg', 'gif', 'bmp');
	// max file size in bytes
	$sizeLimit = 1 * 1024 * 1024;
	
	$uploader = new qqFileUploader($allowedExtensions, $sizeLimit);
	$result = $uploader->handleUpload('/path/to/your/upload/folder/');
	// to pass data through iframe you will need to encode all html tags
	echo htmlspecialchars(json_encode($result), ENT_NOQUOTES);
	
	
	} 



}

myview.php

//you need to include the jquery and the fileuploader.js before this part. 

 
                    <div id="logos-uploader" class="file-uploader">		
		<noscript>			
			<p>Please enable JavaScript to use image uploader.</p>
			<!-- or put a simple form for upload here -->
		</noscript>         
	</div>
    




 <script>        
        function createuploader(){            
            var logo_uploader = new qq.FileUploader({
                element: document.getElementById('logos-uploader'),
                action: '<?=base_url()?>mycontroller/myuploader',
                debug: true,
		//params: { },
		//onSubmit: function(file, ext) {
		
		//},
		allowedExtensions: ['png', 'jpeg', 'jpg', 'gif', 'bmp'],  
		sizeLimit: 1 * 1024 * 1024,  
		onComplete: function(id, fileName, responseJSON){
			if( responseJSON.success ){
				

				//do something 
                                $.log(responseJSON.filename, responseJSON.filesize);
				
				
				}
		}
	
		
            });           
        }
        
	
	
	$(document).ready(function() {
		
		createuploader();
	
	 });	// end of function
	
        
    </script>

Qquploadedfilexhr.php

<?php

/**
 * Handle file uploads via XMLHttpRequest
 */
class qqUploadedFileXhr {
    /**
     * Save the file to the specified path
     * @return boolean TRUE on success
     */
    function save($path) {    
        $input = fopen("php://input", "r");
        $temp = tmpfile();
        $realSize = stream_copy_to_stream($input, $temp);
        fclose($input);
        
        if ($realSize != $this->getSize()){            
            return false;
        }
        
        $target = fopen($path, "w");        
        fseek($temp, 0, SEEK_SET);
        stream_copy_to_stream($temp, $target);
        fclose($target);
        
        return true;
    }
    function getName() {
        return $_GET['qqfile'];
    }
    function getSize() {
        if (isset($_SERVER["CONTENT_LENGTH"])){
            return (int)$_SERVER["CONTENT_LENGTH"];            
        } else {
            throw new Exception('Getting content length is not supported.');
        }      
    }   
}

/**
 * Handle file uploads via regular form post (uses the $_FILES array)
 */
class qqUploadedFileForm {  
    /**
     * Save the file to the specified path
     * @return boolean TRUE on success
     */
    function save($path) {
        if(!move_uploaded_file($_FILES['qqfile']['tmp_name'], $path)){
            return false;
        }
        return true;
    }
    function getName() {
        return $_FILES['qqfile']['name'];
    }
    function getSize() {
        return $_FILES['qqfile']['size'];
    }
}

class qqFileUploader {
    private $allowedExtensions = array();
    private $sizeLimit = 10485760;
    private $file;

    function __construct(array $allowedExtensions = array(), $sizeLimit = 10485760){        
        $allowedExtensions = array_map("strtolower", $allowedExtensions);
            
        $this->allowedExtensions = $allowedExtensions;        
        $this->sizeLimit = $sizeLimit;
        
        $this->checkServerSettings();       

        if (isset($_GET['qqfile'])) {
            $this->file = new qqUploadedFileXhr();
        } elseif (isset($_FILES['qqfile'])) {
            $this->file = new qqUploadedFileForm();
        } else {
            $this->file = false; 
        }
    }
    
    private function checkServerSettings(){        
        $postSize = $this->toBytes(ini_get('post_max_size'));
        $uploadSize = $this->toBytes(ini_get('upload_max_filesize'));        
        
        if ($postSize < $this->sizeLimit || $uploadSize < $this->sizeLimit){
            $size = max(1, $this->sizeLimit / 1024 / 1024) . 'M';             
            die("{'error':'increase post_max_size and upload_max_filesize to $size'}");    
        }        
    }
    
    private function toBytes($str){
        $val = trim($str);
        $last = strtolower($str[strlen($str)-1]);
        switch($last) {
            case 'g': $val *= 1024;
            case 'm': $val *= 1024;
            case 'k': $val *= 1024;        
        }
        return $val;
    }
    
    /**
     * Returns array('success'=>true) or array('error'=>'error message')
     */
    function handleUpload($uploadDirectory, $replaceOldFile = FALSE){
        
        
        
        if (!is_writable($uploadDirectory)){
            return array('error' => "Server error. Upload directory isn't writable.");
        }
        
        if (!$this->file){
            return array('error' => 'No files were uploaded.');
        }
        
        $size = $this->file->getSize();
        
        if ($size == 0) {
            return array('error' => 'File is empty');
        }
        
        if ($size > $this->sizeLimit) {
            return array('error' => 'File is too large');
        }
        
        $pathinfo = pathinfo($this->file->getName());
        $filename = $pathinfo['filename'];
        //$filename = md5(uniqid());
        $ext = $pathinfo['extension'];
        
        
        if($this->allowedExtensions && !in_array(strtolower($ext), $this->allowedExtensions)){
            $these = implode(', ', $this->allowedExtensions);
            return array('error' => 'File has an invalid extension, it should be one of '. $these . '.');
        }
        
        if(!$replaceOldFile){
            /// don't overwrite previous files that were uploaded
            while (file_exists($uploadDirectory . $filename . '.' . $ext)) {
                $filename .= rand(10, 99);
            }
        }
        
        if ($this->file->save($uploadDirectory . $filename . '.' . $ext)){
            //return array('success'=>true);
            return array('success'=>true, 'filename'=>$filename . '.' . $ext, 'filezise'=>$size);
        } else {
            return array('error'=> 'Could not save uploaded file.' .
                'The upload was cancelled, or server error encountered');
        }
        
    }    
}

thanks

Phew - got me going after 3 hours...