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POCodeIgniter AJAX File Upload is not working
 

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    <p>I have written a mechanism to upload a file using AJAX technology (pure javascript) in CodeIgniter.</p> <p>Explanation:</p> <p><strong>1</strong>- I have written a script.js file which is responsible to handle AJAX/Javascript process of the upload.</p> <p><strong>2</strong>- I have written a controller in CodeIgniter which receives request from AJAX to upload the file.</p> <p><strong>3</strong>- I have written a simple HTML page</p> <p><strong>PROBLEM</strong>: When I hit the upload button, simply nothing happens! No error is shown. I think there is a problem with the transfer of data between javascript and php. Because I have used an almost similar code in regular php page and has been successful.</p> <p>Here are files:</p> <p>This is JAVASCRIPT</p> <pre><code>// JavaScript Document var doUpload = function(event){ // globally used variables in this function var progressBar = document.getElementById('progressBar'); event.preventDefault(); // prevents the default action of an element event.stopPropagation(); // get the file-input id var fileId = document.getElementById('file'); // this variable makes an object which accept key/value pairs which could be sent via ajax.send var formObj = new FormData(); // append currently selected file to the dataObject formObj.append('file', fileId.files[0]); // this is a variable to check in the php script (controller if the codeIgniter is used) formObj.append('error-check', true); formObj.append('finish-check', true); // let's make the ajax request object var ajaxReq = new XMLHttpRequest(); // PROGRESS OF THE FILE ///////////////////////////////////////////// // now trigger a function during the progress-process of the file-upload process ajaxReq.upload.addEventListener('progress', function(event){ console.log('this is a very good.'); // first let's get the amount of the file loaded. it is in decimals var percent = event.loaded / event.total; // get the name of the element that the progress-indicator is outputted there if(event.lengthComputable) // if a file is inserted and everything is just OK for uploading { if(progressBar.hasChildNodes()) // cleans the div container for a new progress to display { progressBar.removeChild(progressBar.firsChild); } progressBar.appendChild(document.createTextNode('The Progress So Far: '+percent*100+' %')); } // END OF PROGRESS OF THE FILE ///////////////////////////////////////////// // LOAD OF THE FILE ///////////////////////////////////////////// ajaxReq.upload.addEventListener('load', function(event){ progressBar.appendChild(document.createTextNode(" Completed!")); }); // END OF LOAD OF THE FILE ///////////////////////////////////////////// // ERROR OF THE FILE ///////////////////////////////////////////// ajaxReq.upload.addEventListener('error', function(event){ progressBar.removeChild(); progressBar.appendChild(document.createTextNode("Failed to Upload the File.")); }); // END OF THE ERROR OF THE FILE ///////////////////////////////////////////// // JSON // OPEN THE AJAX REQUEST ajaxReq.open('POST', 'upload/uploader'); // Set the header of the POST request ajaxReq.setRequestHeader('Cache-Control', 'no-cache'); // send the file. remember, we shoud pass a formData object as an argument to the ajaxRequest.send(); ajaxReq.send(formObj); }); } window.addEventListener('load', function(event) { // get the submit id of the form var submitButton = document.getElementById('submit'); submitButton.addEventListener('click', doUpload); }); </code></pre> <p>This is PHP Controller in CodeIgniter</p> <pre><code>&lt;?php class Upload extends CI_Controller { function index() { $this-&gt;load-&gt;view('pages/form'); } function uploader () { // define the required settings for the upload library to instanciate $config['upload_path'] = './uploads/'; $config['allowed_types'] = 'gif|jpg|png|doc|txt'; $config['max_size'] = 1024 * 8; $config['encrypt_name'] = TRUE; // load the upload library $this-&gt;load-&gt;library('upload', $config); if(!$this-&gt;upload-&gt;do_upload('file')) { $data['error'] = $this-&gt;upload-&gt;display_errors(); //$this-&gt;load-&gt;view('pages/form', $data); json_encode($data['error']); } else { $data['uploaded'] = $this-&gt;upload-&gt;data(); //$this-&gt;load-&gt;view('pages/form', $data); } } } </code></pre> <p>This is the HTML</p> <pre><code>&lt;!doctype html&gt; &lt;html&gt; &lt;head&gt; &lt;meta charset="utf-8"&gt; &lt;title&gt;Upload Form With Ajax&lt;/title&gt; &lt;script src="&lt;?php echo base_url(); ?&gt;js/script.js" type='text/javascript'&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;div id='error' style='color: red;height: 40px; width: 200px;'&gt; &lt;?php if(!empty($error)){echo $error; } ?&gt; &lt;/div&gt; &lt;form id='form' name='form' enctype="multipart/form-data" &gt; &lt;input type='file' name='file' id='file'/&gt; &lt;input type='submit' name='submit' id='submit' value='Upload File' /&gt; &lt;/form&gt; &lt;div style='height: 200px; width: 300px; color: red; padding: 10px; background-color: #CCC;' id='progressBar'&gt;&lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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