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File Upload Progress Bar Meter Tutorial Ajax PHP

In this programming lesson you can learn to use HTML + Ajax + PHP to render an elegant file upload progress bar in your file upload forms. It is desirable to render a file upload progress bar when users upload files to your server, much like the way YouTube renders a file upload progress bar every time we upload a video to their network. The new HTML5 progress element has been made specifically for developers to use in scenarios such as this, it automatically matches the specific browser software visually, but you can customize your loading bar graphics for branding or consistency in all the different browsers. Due to the fact that we are using a new HTML5 element, this application may not work as intended in old versions of browser software. Use a modern popular browser software when experimenting with this code. upload_form.html <!DOCTYPE html> <html> <head> <script> /* Script written by Adam Khoury @ DevelopPHP.com */ /* Video Tutorial: http://www.youtube.com/watch?v=EraNFJiY0Eg */ function _(el){ return document.getElementById(el); } function uploadFile(){ var file = _("file1").files[0]; // alert(file.name+" | "+file.size+" | "+file.type); var formdata = new FormData(); formdata.append("file1", file); var ajax = new XMLHttpRequest(); ajax.upload.addEventListener("progress", progressHandler, false); ajax.addEventListener("load", completeHandler, false); ajax.addEventListener("error", errorHandler, false); ajax.addEventListener("abort", abortHandler, false); ajax.open("POST", "file_upload_parser.php"); ajax.send(formdata); } function progressHandler(event){ _("loaded_n_total").innerHTML = "Uploaded "+event.loaded+" bytes of "+event.total; var percent = (event.loaded / event.total) * 100; _("progressBar").value = Math.round(percent); _("status").innerHTML = Math.round(percent)+"% uploaded... please wait"; } function completeHandler(event){ _("status").innerHTML = event.target.responseText; _("progressBar").value = 0; } function errorHandler(event){ _("status").innerHTML = "Upload Failed"; } function abortHandler(event){ _("status").innerHTML = "Upload Aborted"; } </script> </head> <body> <h2>HTML5 File Upload Progress Bar Tutorial</h2> <form id="upload_form" enctype="multipart/form-data" method="post"> <input type="file" name="file1" id="file1"><br> <input type="button" value="Upload File" onclick="uploadFile()"> <progress id="progressBar" value="0" max="100" style="width:300px;"></progress> <h3 id="status"></h3> <p id="loaded_n_total"></p> </form> </body> </html> file_upload_parser.php <?php $fileName = $_FILES["file1"]["name"]; // The file name $fileTmpLoc = $_FILES["file1"]["tmp_name"]; // File in the PHP tmp folder $fileType = $_FILES["file1"]["type"]; // The type of file it is $fileSize = $_FILES["file1"]["size"]; // File size in bytes $fileErrorMsg = $_FILES["file1"]["error"]; // 0 for false... and 1 for true if (!$fileTmpLoc) { // if file not chosen echo "ERROR: Please browse for a file before clicking the upload button."; exit(); } if(move_uploaded_file($fileTmpLoc, "test_uploads/$fileName")){ echo "$fileName upload is complete"; } else { echo "move_uploaded_file function failed"; } ?>
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