UploadQueue: refactor into proper ECMAScript class
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229fb9e5bf
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@ -1,215 +1,211 @@
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function UploadQueue(options) {
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this.queue = options.queue_element;
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this.preview_area = options.preview_area;
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this.upload_progress = [];
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this.upload_url = options.upload_url;
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this.submit = options.submit_button;
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this.addEvents();
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}
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class UploadQueue {
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constructor(options) {
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this.queue = options.queue_element;
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this.preview_area = options.preview_area;
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this.upload_progress = [];
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this.upload_url = options.upload_url;
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this.submit = options.submit_button;
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this.addEvents();
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}
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UploadQueue.prototype.addEvents = function() {
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var that = this;
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that.queue.addEventListener('change', function() {
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that.showSpinner(that.queue, "Generating previews (not uploading yet!)");
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that.clearPreviews();
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for (var i = 0; i < that.queue.files.length; i++) {
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var callback = (i !== that.queue.files.length - 1) ? null : function() {
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that.hideSpinner();
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that.submit.disabled = false;
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addEvents() {
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this.queue.addEventListener('change', event => {
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this.showSpinner(this.queue, "Generating previews (not uploading yet!)");
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this.clearPreviews();
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for (let i = 0; i < this.queue.files.length; i++) {
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const callback = (i !== this.queue.files.length - 1) ? null : () => {
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this.hideSpinner();
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this.submit.disabled = false;
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};
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if (this.queue.files[0].name.includes(".HEIC")) {
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alert('Sorry, the HEIC image format is not supported.\nPlease convert your photos to JPEG before uploading.');
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this.hideSpinner();
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this.submit.disabled = false;
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break;
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}
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this.addPreviewBoxForQueueSlot(i);
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this.addPreviewForFile(this.queue.files[i], i, callback);
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};
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if (that.queue.files[0].name.includes(".HEIC")) {
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alert('Sorry, the HEIC image format is not supported.\nPlease convert your photos to JPEG before uploading.');
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that.hideSpinner();
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that.submit.disabled = false;
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break;
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}
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that.addPreviewBoxForQueueSlot(i);
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that.addPreviewForFile(that.queue.files[i], i, callback);
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};
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});
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that.submit.addEventListener('click', function(e) {
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e.preventDefault();
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that.process();
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});
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this.submit.disabled = true;
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};
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UploadQueue.prototype.clearPreviews = function() {
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this.preview_area.innerHTML = '';
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this.submit.disabled = true;
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this.current_upload_index = -1;
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}
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UploadQueue.prototype.addPreviewBoxForQueueSlot = function(index) {
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var preview_box = document.createElement('div');
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preview_box.id = 'upload_preview_' + index;
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this.preview_area.appendChild(preview_box);
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};
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UploadQueue.prototype.addPreviewForFile = function(file, index, callback) {
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if (!file) {
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return false;
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}
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var preview = document.createElement('canvas');
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preview.title = file.name;
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var preview_box = document.getElementById('upload_preview_' + index);
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preview_box.appendChild(preview);
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var reader = new FileReader();
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var that = this;
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reader.addEventListener('load', function() {
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var original = document.createElement('img');
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original.src = reader.result;
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original.addEventListener('load', function() {
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// Preparation: make canvas size proportional to the original image.
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preview.height = 150;
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preview.width = preview.height * (original.width / original.height);
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// First pass: resize to 50% on temp canvas.
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var temp = document.createElement('canvas'),
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tempCtx = temp.getContext('2d');
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temp.width = original.width * 0.5;
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temp.height = original.height * 0.5;
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tempCtx.drawImage(original, 0, 0, temp.width, temp.height);
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// Second pass: resize again on temp canvas.
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tempCtx.drawImage(temp, 0, 0, temp.width * 0.5, temp.height * 0.5);
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// Final pass: resize to desired size on preview canvas.
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var context = preview.getContext('2d');
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context.drawImage(temp, 0, 0, temp.width * 0.5, temp.height * 0.5,
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0, 0, preview.width, preview.height);
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if (callback) {
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callback();
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}
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});
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}, false);
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reader.readAsDataURL(file);
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};
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UploadQueue.prototype.process = function() {
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this.showSpinner(this.submit, "Preparing to upload files...");
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if (this.queue.files.length > 0) {
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this.submit.addEventListener('click', event => {
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event.preventDefault();
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this.process();
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});
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this.submit.disabled = true;
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this.nextFile();
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}
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};
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UploadQueue.prototype.nextFile = function() {
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var files = this.queue.files;
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var i = ++this.current_upload_index;
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if (i === files.length) {
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this.hideSpinner();
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} else {
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this.setSpinnerLabel("Uploading file " + (i + 1) + " out of " + files.length);
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this.sendFile(files[i], i, function() {
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clearPreviews() {
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this.preview_area.innerHTML = '';
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this.submit.disabled = true;
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this.current_upload_index = -1;
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}
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addPreviewBoxForQueueSlot(index) {
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const preview_box = document.createElement('div');
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preview_box.id = 'upload_preview_' + index;
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this.preview_area.appendChild(preview_box);
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}
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addPreviewForFile(file, index, callback) {
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if (!file) {
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return false;
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}
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const preview = document.createElement('canvas');
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preview.title = file.name;
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const preview_box = document.getElementById('upload_preview_' + index);
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preview_box.appendChild(preview);
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const reader = new FileReader();
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reader.addEventListener('load', event => {
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const original = document.createElement('img');
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original.src = reader.result;
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original.addEventListener('load', function() {
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// Preparation: make canvas size proportional to the original image.
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preview.height = 150;
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preview.width = preview.height * (original.width / original.height);
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// First pass: resize to 50% on temp canvas.
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const temp = document.createElement('canvas'),
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tempCtx = temp.getContext('2d');
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temp.width = original.width * 0.5;
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temp.height = original.height * 0.5;
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tempCtx.drawImage(original, 0, 0, temp.width, temp.height);
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// Second pass: resize again on temp canvas.
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tempCtx.drawImage(temp, 0, 0, temp.width * 0.5, temp.height * 0.5);
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// Final pass: resize to desired size on preview canvas.
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const context = preview.getContext('2d');
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context.drawImage(temp, 0, 0, temp.width * 0.5, temp.height * 0.5,
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0, 0, preview.width, preview.height);
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if (callback) {
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callback();
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}
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});
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}, false);
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reader.readAsDataURL(file);
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}
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process() {
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this.showSpinner(this.submit, "Preparing to upload files...");
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if (this.queue.files.length > 0) {
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this.submit.disabled = true;
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this.nextFile();
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}
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}
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nextFile() {
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const files = this.queue.files;
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const i = ++this.current_upload_index;
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if (i === files.length) {
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this.hideSpinner();
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} else {
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this.setSpinnerLabel("Uploading file " + (i + 1) + " out of " + files.length);
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this.sendFile(files[i], i, this.nextFile);
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}
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}
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sendFile(file, index, callback) {
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const request = new XMLHttpRequest();
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request.addEventListener('error', event => {
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this.updateProgress(index, -1);
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});
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}
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};
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UploadQueue.prototype.sendFile = function(file, index, callback) {
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// Prepare the request.
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var that = this;
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var request = new XMLHttpRequest();
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request.addEventListener('error', function(event) {
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that.updateProgress(index, -1);
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});
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request.addEventListener('progress', function(event) {
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that.updateProgress(index, event.loaded / event.total);
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});
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request.addEventListener('load', function(event) {
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that.updateProgress(index, 1);
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if (request.responseText !== null && request.status === 200) {
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var obj = JSON.parse(request.responseText);
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if (obj.error) {
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alert(obj.error);
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return;
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request.addEventListener('progress', event => {
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this.updateProgress(index, event.loaded / event.total);
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});
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request.addEventListener('load', event => {
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this.updateProgress(index, 1);
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if (request.responseText !== null && request.status === 200) {
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const obj = JSON.parse(request.responseText);
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if (obj.error) {
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alert(obj.error);
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return;
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}
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else if (callback) {
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callback.call(this, obj);
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}
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}
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else if (callback) {
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callback.call(that, obj);
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});
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const data = new FormData();
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data.append('uploads', file, file.name);
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request.open('POST', this.upload_url, true);
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request.send(data);
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}
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addProgressBar(index) {
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if (index in this.upload_progress) {
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return;
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}
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const progress_container = document.createElement('div');
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progress_container.className = 'progress';
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const progress = document.createElement('div');
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progress_container.appendChild(progress);
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const preview_box = document.getElementById('upload_preview_' + index);
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preview_box.appendChild(progress_container);
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this.upload_progress[index] = progress;
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}
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updateProgress(index, progress) {
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if (!(index in this.upload_progress)) {
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this.addProgressBar(index);
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}
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const bar = this.upload_progress[index];
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if (progress >= 0) {
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bar.style.width = Math.ceil(progress * 100) + '%';
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} else {
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bar.style.width = "";
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if (progress === -1) {
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bar.className = "error";
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}
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}
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});
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var data = new FormData();
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data.append('uploads', file, file.name);
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request.open('POST', this.upload_url, true);
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request.send(data);
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};
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UploadQueue.prototype.addProgressBar = function(index) {
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if (index in this.upload_progress) {
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return;
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}
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var progress_container = document.createElement('div');
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progress_container.className = 'progress';
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showSpinner(sibling, label) {
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if (this.spinner) {
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return;
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}
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var progress = document.createElement('div');
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progress_container.appendChild(progress);
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this.spinner = document.createElement('div');
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this.spinner.className = 'spinner';
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sibling.parentNode.appendChild(this.spinner);
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var preview_box = document.getElementById('upload_preview_' + index);
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preview_box.appendChild(progress_container);
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this.upload_progress[index] = progress;
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};
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UploadQueue.prototype.updateProgress = function(index, progress) {
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if (!(index in this.upload_progress)) {
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this.addProgressBar(index);
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}
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var bar = this.upload_progress[index];
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if (progress >= 0) {
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bar.style.width = Math.ceil(progress * 100) + '%';
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} else {
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bar.style.width = "";
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if (progress === -1) {
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bar.className = "error";
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if (label) {
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this.spinner_label = document.createElement('span');
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this.spinner_label.className = 'spinner_label';
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this.spinner_label.innerHTML = label;
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sibling.parentNode.appendChild(this.spinner_label);
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}
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}
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};
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UploadQueue.prototype.showSpinner = function(sibling, label) {
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if (this.spinner) {
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return;
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setSpinnerLabel(label) {
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if (this.spinner_label) {
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this.spinner_label.innerHTML = label;
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}
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}
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this.spinner = document.createElement('div');
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this.spinner.className = 'spinner';
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sibling.parentNode.appendChild(this.spinner);
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if (label) {
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this.spinner_label = document.createElement('span');
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this.spinner_label.className = 'spinner_label';
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this.spinner_label.innerHTML = label;
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sibling.parentNode.appendChild(this.spinner_label);
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}
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};
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UploadQueue.prototype.setSpinnerLabel = function(label) {
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if (this.spinner_label) {
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this.spinner_label.innerHTML = label;
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hideSpinner() {
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if (this.spinner) {
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this.spinner.parentNode.removeChild(this.spinner);
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this.spinner = null;
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}
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if (this.spinner_label) {
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this.spinner_label.parentNode.removeChild(this.spinner_label);
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this.spinner_label = null;
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}
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}
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}
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UploadQueue.prototype.hideSpinner = function() {
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if (this.spinner) {
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this.spinner.parentNode.removeChild(this.spinner);
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this.spinner = null;
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}
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if (this.spinner_label) {
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this.spinner_label.parentNode.removeChild(this.spinner_label);
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this.spinner_label = null;
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}
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};
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