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function addRow(file) {
var row = document.createElement('li');
var name = document.createElement('span');
name.textContent = file.name;
name.className = 'file-name';
var progressIndicator = document.createElement('span');
progressIndicator.className = 'progress-percent';
progressIndicator.textContent = '0%';
var progressBar = document.createElement('progress');
progressBar.className = 'file-progress';
progressBar.setAttribute("max", "100");
progressBar.setAttribute("value", "0");
row.appendChild(name);
row.appendChild(progressBar);
row.appendChild(progressIndicator);
document.getElementById('upload-filelist').appendChild(row);
return row;
}
function handleUploadProgress(evt) {
var xhr = evt.target;
var bar = xhr.bar;
var percentIndicator = xhr.percent;
if (evt.lengthComputable) {
var progressPercent = Math.floor((evt.loaded / evt.total) * 100);
bar.setAttribute("value", progressPercent);
percentIndicator.textContent = progressPercent + '%';
}
}
function handleUploadComplete(evt) {
var xhr = evt.target;
var bar = xhr.bar;
var row = xhr.row;
var percentIndicator = xhr.percent;
percentIndicator.style.visibility = "hidden";
bar.style.visibility = "hidden";
row.removeChild(bar);
row.removeChild(percentIndicator);
var respStatus = xhr.status;
var url = document.createElement('span');
url.className = 'file-url';
row.appendChild(url);
var link = document.createElement('a');
if (respStatus === 200) {
var response = JSON.parse(xhr.responseText);
if (response.success) {
link.textContent = response.files[0].url.replace(/.*?:\/\//g, "");
link.href = response.files[0].url;
url.appendChild(link);
} else {
bar.innerHTML = 'Error: ' + response.reason;
}
} else if (respStatus === 413) {
link.textContent = 'File Too big!';
url.appendChild(link);
} else {
link.textContent = 'Server error!';
url.appendChild(link);
}
}
function uploadFile(file, row) {
var bar = row.querySelector('.file-progress');
var percentIndicator = row.querySelector('.progress-percent');
var xhr = new XMLHttpRequest();
xhr.open('POST', '/upload.php');
xhr["row"] = row;
xhr["bar"] = bar;
xhr["percent"] = percentIndicator;
xhr.upload["bar"] = bar;
xhr.upload["percent"] = percentIndicator;
xhr.addEventListener('load', handleUploadComplete, false);
xhr.upload.onprogress = handleUploadProgress;
var form = new FormData();
form.append('files[]', file);
xhr.send(form);
}
function stopDefaultEvent(evt) {
evt.stopPropagation();
evt.preventDefault();
}
function handleDrag(state, element, evt) {
stopDefaultEvent(evt);
if (state.dragCount == 1) {
element.textContent = "Drop it here~";
}
state.dragCount += 1;
}
function handleDragAway(state, element, evt) {
stopDefaultEvent(evt);
state.dragCount -= 1;
if (state.dragCount == 0) {
element.textContent = "Select or drop file(s)";
}
}
function handleDragDrop(state, element, evt) {
stopDefaultEvent(evt);
handleDragAway(state, element, evt);
var len = evt.dataTransfer.files.length;
for (var i = 0; i < len; i++) {
var file = evt.dataTransfer.files[i];
var row = addRow(file);
uploadFile(file, row);
}
}
function uploadFiles(evt) {
var len = evt.target.files.length;
for (var i = 0; i < len; i++) {
var file = evt.target.files[i];
var row = addRow(file);
uploadFile(file, row);
}
}
function selectFiles(target, evt) {
stopDefaultEvent(evt);
target.click();
}
var state = { dragCount: 0 };
var uploadButton = document.getElementById('upload-btn');
window.addEventListener('dragenter', handleDrag.bind(this, state, uploadButton), false);
window.addEventListener('dragleave', handleDragAway.bind(this, state, uploadButton), false);
window.addEventListener('drop', handleDragAway.bind(this, state, uploadButton), false);
window.addEventListener('dragover', stopDefaultEvent, false);
var uploadInput = document.getElementById('upload-input');
uploadInput.addEventListener('change', uploadFiles);
uploadButton.addEventListener('click', selectFiles.bind(this, uploadInput));
uploadButton.addEventListener('drop', handleDragDrop.bind(this, state, uploadButton), false);
document.getElementById('upload-form').classList.add('js');
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