jQuery Image Upload - CodeIgniter
Question: I use jQuery Image upload like this <http://blueimp.github.com/jQuery-File-
Upload/>

I get the thumbnail and after clicking the upload button I get the progress
bar, but then get 'SyntaxError: JSON.parse: unexpected character'

view page

    
    
    </body>
    </html>
    <head>
    <meta charset="utf-8">
    <title>jQuery File Upload Demo</title>
    
    <link rel="stylesheet" href="http://twitter.github.com/bootstrap/1.4.0/bootstrap.min.css">
    <link rel="stylesheet" href="http://blueimp.github.com/Bootstrap-Image-Gallery/bootstrap-image-gallery.min.css">
    <!--[if lt IE 7]><link rel="stylesheet" href="http://blueimp.github.com/Bootstrap-Image-Gallery/bootstrap-ie6.min.css"><![endif]-->
    <link rel="stylesheet" href="http://blueimp.github.com/jQuery-File-Upload/jquery.fileupload-ui.css">
    <style type="text/css">body {padding-top: 80px;}</style>
    <meta name="description" content="File Upload widget with multiple file selection, drag&amp;drop support, progress bar and preview images for jQuery. Supports cross-domain, chunked and resumable file uploads. Works with any server-side platform (Google App Engine, PHP, Python, Ruby on Rails, Java, etc.) that supports standard HTML form file uploads.">
    </head>
    <body>
    
    <div class="container">
    
    
        <?php echo form_open_multipart('upload/do_upload', array('id'=>'fileupload')); ?>
    
    
            <div class="row">
                <div class="span16 fileupload-buttonbar">
                    <div class="progressbar fileupload-progressbar fade"><div style="width:0%;"></div></div>
                    <span class="btn success fileinput-button">
                        <span>Add files...</span>
                        <input type="file" name="userfile[]" multiple>
                    </span>
                    <button type="submit" class="btn primary start">Start upload</button>
                    <button type="reset" class="btn info cancel">Cancel upload</button>
                    <button type="button" class="btn danger delete">Delete selected</button>
                    <input type="checkbox" class="toggle">
                </div>
            </div>
            <br>
            <div class="row">
                <div class="span16">
                    <table class="zebra-striped"><tbody class="files"></tbody></table>
                </div>
            </div>
        </form>
    
    </div>
    <!-- gallery-loader is the loading animation container -->
    <div id="gallery-loader"></div>
    <!-- gallery-modal is the modal dialog used for the image gallery -->
    <div id="gallery-modal" class="modal hide fade">
        <div class="modal-header">
            <a href="#" class="close">&times;</a>
            <h3 class="title"></h3>
        </div>
        <div class="modal-body"></div>
        <div class="modal-footer">
            <a class="btn primary next">Next</a>
            <a class="btn info prev">Previous</a>
            <a class="btn success download" target="_blank">Download</a>
        </div>
    </div>
    <script>
    var fileUploadErrors = {
        maxFileSize: 'File is too big',
        minFileSize: 'File is too small',
        acceptFileTypes: 'Filetype not allowed',
        maxNumberOfFiles: 'Max number of files exceeded',
        uploadedBytes: 'Uploaded bytes exceed file size',
        emptyResult: 'Empty file upload result'
    };
    
    </script>
    <script id="template-upload" type="text/html">
    {% for (var i=0, files=o.files, l=files.length, file=files[0]; i<l; file=files[++i]) { %}
        <tr class="template-upload fade">
            <td class="preview"><span class="fade"></span></td>
            <td class="name">{%=file.name%}</td>
            <td class="size">{%=o.formatFileSize(file.size)%}</td>
            {% if (file.error) { %}
                <td class="error" colspan="2"><span class="label important">Error</span> {%=fileUploadErrors[file.error] || file.error%}</td>
            {% } else if (o.files.valid && !i) { %}
                <td class="progress"><div class="progressbar"><div style="width:0%;"></div></div></td>
                <td class="start">{% if (!o.options.autoUpload) { %}<button class="btn primary">Start</button>{% } %}</td>
            {% } else { %}
                <td colspan="2"></td>
            {% } %}
            <td class="cancel">{% if (!i) { %}<button class="btn info">Cancel</button>{% } %}</td>
        </tr>
    {% } %}
    </script>
    <script id="template-download" type="text/html">
    {% for (var i=0, files=o.files, l=files.length, file=files[0]; i<l; file=files[++i]) { %}
        <tr class="template-download fade">
            {% if (file.error) { %}
                <td></td>
                <td class="name">{%=file.name%}</td>
                <td class="size">{%=o.formatFileSize(file.size)%}</td>
                <td class="error" colspan="2"><span class="label important">Error</span> {%=fileUploadErrors[file.error] || file.error%}</td>
            {% } else { %}
                <td class="preview">{% if (file.thumbnail_url) { %}
                    <a href="{%=file.url%}" title="{%=file.name%}" rel="gallery"><img src="{%=file.thumbnail_url%}"></a>
                {% } %}</td>
                <td class="name">
                    <a href="{%=file.url%}" title="{%=file.name%}" rel="{%=file.thumbnail_url&&'gallery'%}">{%=file.name%}</a>
                </td>
                <td class="size">{%=o.formatFileSize(file.size)%}</td>
                <td colspan="2"></td>
            {% } %}
            <td class="delete">
                <button class="btn danger" data-type="{%=file.delete_type%}" data-url="{%=file.delete_url%}">Delete</button>
                <input type="checkbox" name="delete" value="1">
            </td>
        </tr>
    {% } %}
    </script>
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
    <!-- The jQuery UI widget factory, can be omitted if jQuery UI is already included -->
    <script src="http://blueimp.github.com/jQuery-File-Upload/vendor/jquery.ui.widget.js"></script>
    <!-- The Templates and Load Image plugins are included for the FileUpload user interface -->
    <script src="http://blueimp.github.com/JavaScript-Templates/tmpl.min.js"></script>
    <script src="http://blueimp.github.com/JavaScript-Load-Image/load-image.min.js"></script>
    <!-- Bootstrap Modal and Image Gallery are not required, but included for the demo -->
    <script src="http://twitter.github.com/bootstrap/1.4.0/bootstrap-modal.min.js"></script>
    
    <script src="http://blueimp.github.com/Bootstrap-Image-Gallery/bootstrap-image-gallery.min.js"></script>
    <!-- The Iframe Transport is required for browsers without support for XHR file uploads -->
    <script src="http://blueimp.github.com/jQuery-File-Upload/jquery.iframe-transport.js"></script>
    <script src="http://blueimp.github.com/jQuery-File-Upload/jquery.fileupload.js"></script>
    <script src="http://blueimp.github.com/jQuery-File-Upload/jquery.fileupload-ui.js"></script>
    <script src="http://blueimp.github.com/jQuery-File-Upload/application.js"></script>
    <!-- The XDomainRequest Transport is included for cross-domain file deletion for IE8+ -->
    <!--[if gte IE 8]><script src="http://blueimp.github.com/jQuery-File-Upload/cors/jquery.xdr-transport.js"></script><![endif]-->
    
    
    </body> 
    </html>
    

controller page:

    
    
    class upload extends CI_Controller {
    
        function __construct()
        {
            parent::__construct();
            $this->load->helper(array('form', 'url'));
    
    
    
        }
    
        function index()
        {    
            $this->load->view('index');
        }
    
        function do_upload()
        {
            $config['upload_path'] = './uploads/'; // server directory
            $config['allowed_types'] = 'gif|jpg|png'; // by extension, will check for whether it is an image
            $config['max_size']    = '1000'; // in kb
            $config['max_width']  = '1024';
            $config['max_height']  = '768';
    
            $this->load->library('upload', $config);
            $this->load->library('Multi_upload');
    
            $files = $this->multi_upload->go_upload();
    
            if ( ! $files )        
            {
                $error = array('error' => $this->upload->display_errors());
                $this->load->view('index', $error);
            }    
            else
            {
                $data = array('upload_data' => $files);
                $this->load->view('upload_success', $data);
            }
        }    
    }
    

Any Help?


Answer: I also got this error even when the files were uploading successfully. The
issue I came across was what I was returning. More info can be found here
<https://github.com/blueimp/jQuery-File-Upload/wiki/Setup> and the section
labelled **Using jQuery File Upload (UI version) with a custom server-side
upload handler**

so it basically says: _"Note that the response should always be a JSON object
containing a files array even if only one file is uploaded."_ You should still
pass a files array back even if you get a server side error.

Here is an example of my Upload function (the keys part are the "echo
json_encode"):

    
    
    function upload_file($component_files_id = null,$thumb_width = 400)
    {
        $config['upload_path'] = ($component_files_id) ? './documents/component_files/'.$component_files_id : './documents/image_uploads';
        if (!file_exists($config['upload_path']))
            @mkdir($config['upload_path'], 0777, true);
    
        $config['allowed_types'] = 'gif|jpg|png|pdf|doc|docx|docm|odt|xls|xlsx|xlsm|ods|csv';
        $config['max_size'] = '10000'; #in KB
        $config['max_width']  = '5000';
        $config['max_height']  = '5000';
    
        $this->load->library('upload', $config);
        if (!$this->upload->do_upload())
        {
            $error = $this->upload->display_errors('','');
    
            if(is_ajax()){
                $file['error'] = $error;
                echo json_encode(array('files'=>array($file)));
            }
            else
                set_message($error,'error',true);
        }
        else
        {
            $file = $this->upload->data();
            $file['is_image'] =  ($file['is_image'] == '1') ? 'TRUE' : 'FALSE';
            $file['updated_by'] = get_user('user_id');
            $file['created_by'] = get_user('user_id');
            if($component_files_id)
                $file['component_files_id'] = $component_files_id;
            //save the file details to the database
            $file_id = $this->page_model->save_file($file); 
            if($file['is_image'] == 'TRUE'){    
                $thumb_width = ($component_files_id) ? 290 : $thumb_width; 
                $this->_create_thumbnail($file_id,$thumb_width);
            }
            //set the data for the json array   
            $info->id = $file_id;
            $info->name = $file['file_name'];
            $info->size = $file['file_size'];
            $info->type = $file['file_type'];
            if($file['is_image'] == 'TRUE'){
                $info->url =    base_url().'files/image/'.$file_id;
                $info->thumbnail_url = base_url().'files/image/'.$file_id.'/thumb';
            }
            else{
                $info->url =    base_url().'files/download/'.$file_id;
                $info->thumbnail_url = base_url().'images/document-icon.png';               
            }               
    
            $info->delete_url = base_url().'files/delete_document/'.$file_id;
            $info->delete_type = 'DELETE';  
            $files['files'] = array($info);
            header('Content-type: text/html');
            echo json_encode($files);
        }
    }
    

