Pure HTML5 file upload
HTML5 upload tutorial: today we will develop a great HTML5 file upload form with progress bar and preview (at client-side). We have already gave you jQuery based solution, but today’s application don’t require jQuery at all. All made in pure HTML5 Javascript. I’m going to use FileReader (html5) to implement live preview (without uploading to server), and, going to use XMLHttpRequest to send data to server.
Here are our demo and downloadable package:
Live Demo
Ok, download the sources and lets begin !
Step 1. HTML
At this page you can see out form for upload images
index.html
<html lang="en" >
<head>
<meta charset="utf-8" />
<title>Pure HTML5 file upload | Script Tutorials</title>
<link href="css/main.css" rel="stylesheet" type="text/css" />
<script src="js/script.js"></script>
</head>
<body>
<header>
<h2>Pure HTML5 file upload</h2>
<a href="https://www.script-tutorials.com/pure-html5-file-upload/" class="stuts">Back to original tutorial on <span>Script Tutorials</span></a>
</header>
<div class="container">
<div class="contr"><h2>You can select the file (image) and click Upload button</h2></div>
<div class="upload_form_cont">
<form id="upload_form" enctype="multipart/form-data" method="post" action="upload.php">
<div>
<div><label for="image_file">Please select image file</label></div>
<div><input type="file" name="image_file" id="image_file" onchange="fileSelected();" /></div>
</div>
<div>
<input type="button" value="Upload" onclick="startUploading()" />
</div>
<div id="fileinfo">
<div id="filename"></div>
<div id="filesize"></div>
<div id="filetype"></div>
<div id="filedim"></div>
</div>
<div id="error">You should select valid image files only!</div>
<div id="error2">An error occurred while uploading the file</div>
<div id="abort">The upload has been canceled by the user or the browser dropped the connection</div>
<div id="warnsize">Your file is very big. We can't accept it. Please select more small file</div>
<div id="progress_info">
<div id="progress"></div>
<div id="progress_percent"> </div>
<div class="clear_both"></div>
<div>
<div id="speed"> </div>
<div id="remaining"> </div>
<div id="b_transfered"> </div>
<div class="clear_both"></div>
</div>
<div id="upload_response"></div>
</div>
</form>
<img id="preview" />
</div>
</div>
</body>
</html>
Step 2. CSS
css/main.css
I have selected all necessary styles for our html5 upload form
css/main.css
.upload_form_cont {
background: -moz-linear-gradient(#ffffff, #f2f2f2);
background: -ms-linear-gradient(#ffffff, #f2f2f2);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #ffffff), color-stop(100%, #f2f2f2));
background: -webkit-linear-gradient(#ffffff, #f2f2f2);
background: -o-linear-gradient(#ffffff, #f2f2f2);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#f2f2f2');
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#f2f2f2')";
background: linear-gradient(#ffffff, #f2f2f2);
color:#000;
overflow:hidden;
}
#upload_form {
float:left;
padding:20px;
width:700px;
}
#preview {
background-color:#fff;
display:block;
float:right;
width:200px;
}
#upload_form > div {
margin-bottom:10px;
}
#speed,#remaining {
float:left;
width:100px;
}
#b_transfered {
float:right;
text-align:right;
}
.clear_both {
clear:both;
}
input {
border-radius:10px;
-moz-border-radius:10px;
-ms-border-radius:10px;
-o-border-radius:10px;
-webkit-border-radius:10px;
border:1px solid #ccc;
font-size:14pt;
padding:5px 10px;
}
input[type=button] {
background: -moz-linear-gradient(#ffffff, #dfdfdf);
background: -ms-linear-gradient(#ffffff, #dfdfdf);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #ffffff), color-stop(100%, #dfdfdf));
background: -webkit-linear-gradient(#ffffff, #dfdfdf);
background: -o-linear-gradient(#ffffff, #dfdfdf);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#dfdfdf');
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#dfdfdf')";
background: linear-gradient(#ffffff, #dfdfdf);
}
#image_file {
width:400px;
}
#progress_info {
font-size:10pt;
}
#fileinfo,#error,#error2,#abort,#warnsize {
color:#aaa;
display:none;
font-size:10pt;
font-style:italic;
margin-top:10px;
}
#progress {
border:1px solid #ccc;
display:none;
float:left;
height:14px;
border-radius:10px;
-moz-border-radius:10px;
-ms-border-radius:10px;
-o-border-radius:10px;
-webkit-border-radius:10px;
background: -moz-linear-gradient(#66cc00, #4b9500);
background: -ms-linear-gradient(#66cc00, #4b9500);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #66cc00), color-stop(100%, #4b9500));
background: -webkit-linear-gradient(#66cc00, #4b9500);
background: -o-linear-gradient(#66cc00, #4b9500);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#66cc00', endColorstr='#4b9500');
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr='#66cc00', endColorstr='#4b9500')";
background: linear-gradient(#66cc00, #4b9500);
}
#progress_percent {
float:right;
}
#upload_response {
margin-top: 10px;
padding: 20px;
overflow: hidden;
display: none;
border: 1px solid #ccc;
border-radius:10px;
-moz-border-radius:10px;
-ms-border-radius:10px;
-o-border-radius:10px;
-webkit-border-radius:10px;
box-shadow: 0 0 5px #ccc;
background: -moz-linear-gradient(#bbb, #eee);
background: -ms-linear-gradient(#bbb, #eee);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #bbb), color-stop(100%, #eee));
background: -webkit-linear-gradient(#bbb, #eee);
background: -o-linear-gradient(#bbb, #eee);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#bbb', endColorstr='#eee');
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr='#bbb', endColorstr='#eee')";
background: linear-gradient(#bbb, #eee);
}
Step 3. HTML5 JS
js/script.js
// common variables
var iBytesUploaded = 0;
var iBytesTotal = 0;
var iPreviousBytesLoaded = 0;
var iMaxFilesize = 1048576; // 1MB
var oTimer = 0;
var sResultFileSize = '';
function secondsToTime(secs) { // we will use this function to convert seconds in normal time format
var hr = Math.floor(secs / 3600);
var min = Math.floor((secs - (hr * 3600))/60);
var sec = Math.floor(secs - (hr * 3600) - (min * 60));
if (hr < 10) {hr = "0" + hr; }
if (min < 10) {min = "0" + min;}
if (sec < 10) {sec = "0" + sec;}
if (hr) {hr = "00";}
return hr + ':' + min + ':' + sec;
};
function bytesToSize(bytes) {
var sizes = ['Bytes', 'KB', 'MB'];
if (bytes == 0) return 'n/a';
var i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
return (bytes / Math.pow(1024, i)).toFixed(1) + ' ' + sizes[i];
};
function fileSelected() {
// hide different warnings
document.getElementById('upload_response').style.display = 'none';
document.getElementById('error').style.display = 'none';
document.getElementById('error2').style.display = 'none';
document.getElementById('abort').style.display = 'none';
document.getElementById('warnsize').style.display = 'none';
// get selected file element
var oFile = document.getElementById('image_file').files[0];
// filter for image files
var rFilter = /^(image\/bmp|image\/gif|image\/jpeg|image\/png|image\/tiff)$/i;
if (! rFilter.test(oFile.type)) {
document.getElementById('error').style.display = 'block';
return;
}
// little test for filesize
if (oFile.size > iMaxFilesize) {
document.getElementById('warnsize').style.display = 'block';
return;
}
// get preview element
var oImage = document.getElementById('preview');
// prepare HTML5 FileReader
var oReader = new FileReader();
oReader.onload = function(e){
// e.target.result contains the DataURL which we will use as a source of the image
oImage.src = e.target.result;
oImage.onload = function () { // binding onload event
// we are going to display some custom image information here
sResultFileSize = bytesToSize(oFile.size);
document.getElementById('fileinfo').style.display = 'block';
document.getElementById('filename').innerHTML = 'Name: ' + oFile.name;
document.getElementById('filesize').innerHTML = 'Size: ' + sResultFileSize;
document.getElementById('filetype').innerHTML = 'Type: ' + oFile.type;
document.getElementById('filedim').innerHTML = 'Dimension: ' + oImage.naturalWidth + ' x ' + oImage.naturalHeight;
};
};
// read selected file as DataURL
oReader.readAsDataURL(oFile);
}
function startUploading() {
// cleanup all temp states
iPreviousBytesLoaded = 0;
document.getElementById('upload_response').style.display = 'none';
document.getElementById('error').style.display = 'none';
document.getElementById('error2').style.display = 'none';
document.getElementById('abort').style.display = 'none';
document.getElementById('warnsize').style.display = 'none';
document.getElementById('progress_percent').innerHTML = '';
var oProgress = document.getElementById('progress');
oProgress.style.display = 'block';
oProgress.style.width = '0px';
// get form data for POSTing
//var vFD = document.getElementById('upload_form').getFormData(); // for FF3
var vFD = new FormData(document.getElementById('upload_form'));
// create XMLHttpRequest object, adding few event listeners, and POSTing our data
var oXHR = new XMLHttpRequest();
oXHR.upload.addEventListener('progress', uploadProgress, false);
oXHR.addEventListener('load', uploadFinish, false);
oXHR.addEventListener('error', uploadError, false);
oXHR.addEventListener('abort', uploadAbort, false);
oXHR.open('POST', 'upload.php');
oXHR.send(vFD);
// set inner timer
oTimer = setInterval(doInnerUpdates, 300);
}
function doInnerUpdates() { // we will use this function to display upload speed
var iCB = iBytesUploaded;
var iDiff = iCB - iPreviousBytesLoaded;
// if nothing new loaded - exit
if (iDiff == 0)
return;
iPreviousBytesLoaded = iCB;
iDiff = iDiff * 2;
var iBytesRem = iBytesTotal - iPreviousBytesLoaded;
var secondsRemaining = iBytesRem / iDiff;
// update speed info
var iSpeed = iDiff.toString() + 'B/s';
if (iDiff > 1024 * 1024) {
iSpeed = (Math.round(iDiff * 100/(1024*1024))/100).toString() + 'MB/s';
} else if (iDiff > 1024) {
iSpeed = (Math.round(iDiff * 100/1024)/100).toString() + 'KB/s';
}
document.getElementById('speed').innerHTML = iSpeed;
document.getElementById('remaining').innerHTML = '| ' + secondsToTime(secondsRemaining);
}
function uploadProgress(e) { // upload process in progress
if (e.lengthComputable) {
iBytesUploaded = e.loaded;
iBytesTotal = e.total;
var iPercentComplete = Math.round(e.loaded * 100 / e.total);
var iBytesTransfered = bytesToSize(iBytesUploaded);
document.getElementById('progress_percent').innerHTML = iPercentComplete.toString() + '%';
document.getElementById('progress').style.width = (iPercentComplete * 4).toString() + 'px';
document.getElementById('b_transfered').innerHTML = iBytesTransfered;
if (iPercentComplete == 100) {
var oUploadResponse = document.getElementById('upload_response');
oUploadResponse.innerHTML = '<h1>Please wait...processing</h1>';
oUploadResponse.style.display = 'block';
}
} else {
document.getElementById('progress').innerHTML = 'unable to compute';
}
}
function uploadFinish(e) { // upload successfully finished
var oUploadResponse = document.getElementById('upload_response');
oUploadResponse.innerHTML = e.target.responseText;
oUploadResponse.style.display = 'block';
document.getElementById('progress_percent').innerHTML = '100%';
document.getElementById('progress').style.width = '400px';
document.getElementById('filesize').innerHTML = sResultFileSize;
document.getElementById('remaining').innerHTML = '| 00:00:00';
clearInterval(oTimer);
}
function uploadError(e) { // upload error
document.getElementById('error2').style.display = 'block';
clearInterval(oTimer);
}
function uploadAbort(e) { // upload abort
document.getElementById('abort').style.display = 'block';
clearInterval(oTimer);
}
Most of code is already commented. So I will hope that you will understand all this code. Anyway – how it working: when we select file – function ‘fileSelected’ is executing. We filter all unnecessary formats (allow to upload next formats: bmp, gif, jpg, png, tif), in case of huge file – we will draw warning message. Then, through FileReader::readAsDataURL we will draw live preview of selected file. Plus, we will display another information about image: its name, size, type, and dimensions. Process of uploading is a little complicated. But generally, we have to prepare XMLHttpRequest object, add event listeners to next events: progress, load, error and abort. And after – post form data (I have used FormData class) to our ‘upload.php’ receiver.
Step 4. PHP
upload.php
<?php
function bytesToSize1024($bytes, $precision = 2) {
$unit = array('B','KB','MB');
return @round($bytes / pow(1024, ($i = floor(log($bytes, 1024)))), $precision).' '.$unit[$i];
}
$sFileName = $_FILES['image_file']['name'];
$sFileType = $_FILES['image_file']['type'];
$sFileSize = bytesToSize1024($_FILES['image_file']['size'], 1);
echo <<<EOF
<p>Your file: {$sFileName} has been successfully received.</p>
<p>Type: {$sFileType}</p>
<p>Size: {$sFileSize}</p>
EOF;
As you can see – I’m not uploading file. But, ‘echo’ back all info about accepted file. This information will appear in our <div id="upload_response"></div> element.
Live Demo
Conclusion
Welcome back to read new awesome and unique articles about HTML5. Good luck!