267 lines
8.9 KiB
JavaScript
267 lines
8.9 KiB
JavaScript
/**
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* Copyright (c) 2016 Luminarys <postmaster@gensok.io>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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document.addEventListener('DOMContentLoaded', function() {
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/**
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* Sets up the elements inside file upload rows.
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*
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* @param {File} file
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* @return {HTMLLIElement} row
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*/
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function addRow(file) {
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var row = document.createElement('li');
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var name = document.createElement('span');
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name.textContent = file.name;
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name.className = 'file-name';
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var progressIndicator = document.createElement('span');
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progressIndicator.className = 'progress-percent';
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progressIndicator.textContent = '0%';
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var progressBar = document.createElement('progress');
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progressBar.className = 'file-progress';
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progressBar.setAttribute('max', '100');
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progressBar.setAttribute('value', '0');
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row.appendChild(name);
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row.appendChild(progressBar);
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row.appendChild(progressIndicator);
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document.getElementById('upload-filelist').appendChild(row);
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return row;
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}
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/**
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* Updates the page while the file is being uploaded.
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*
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* @param {ProgressEvent} evt
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*/
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function handleUploadProgress(evt) {
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var xhr = evt.target;
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var bar = xhr.bar;
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var percentIndicator = xhr.percent;
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/* If we have amounts of work done/left that we can calculate with
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(which, unless we're uploading dynamically resizing data, is always), calculate the percentage. */
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if (evt.lengthComputable) {
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var progressPercent = Math.floor((evt.loaded / evt.total) * 100);
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bar.setAttribute('value', progressPercent);
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percentIndicator.textContent = progressPercent + '%';
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}
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}
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/**
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* Complete the uploading process by checking the response status and, if the
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* upload was successful, writing the URL(s) and creating the copy element(s)
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* for the files.
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*
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* @param {ProgressEvent} evt
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*/
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function handleUploadComplete(evt) {
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var xhr = evt.target;
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var bar = xhr.bar;
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var row = xhr.row;
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var percentIndicator = xhr.percent;
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percentIndicator.style.visibility = 'hidden';
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bar.style.visibility = 'hidden';
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row.removeChild(bar);
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row.removeChild(percentIndicator);
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var respStatus = xhr.status;
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var url = document.createElement('span');
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url.className = 'file-url';
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row.appendChild(url);
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var link = document.createElement('a');
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if (respStatus === 200) {
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var response = JSON.parse(xhr.responseText);
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if (response.success) {
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link.textContent = response.files[0].url.replace(/.*?:\/\//g, '');
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link.href = response.files[0].url;
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url.appendChild(link);
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var copy = document.createElement('button');
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copy.className = 'upload-clipboard-btn';
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var glyph = document.createElement('img');
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glyph.src = 'img/glyphicons-512-copy.png';
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copy.appendChild(glyph);
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url.appendChild(copy);
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copy.addEventListener("click", function(event) {
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/* Why create an element? The text needs to be on screen to be
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selected and thus copied. The only text we have on-screen is the link
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without the http[s]:// part. So, this creates an element with the
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full link for a moment and then deletes it.
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See the "Complex Example: Copy to clipboard without displaying
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input" section at: https://stackoverflow.com/a/30810322 */
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var element = document.createElement('a');
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element.textContent = response.files[0].url;
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link.appendChild(element);
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var range = document.createRange();
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range.selectNode(element);
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window.getSelection().removeAllRanges();
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window.getSelection().addRange(range);
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document.execCommand("copy");
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link.removeChild(element);
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});
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} else {
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bar.innerHTML = 'Error: ' + response.description;
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}
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} else if (respStatus === 413) {
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link.textContent = 'File too big!';
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url.appendChild(link);
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} else {
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link.textContent = 'Server error!';
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url.appendChild(link);
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}
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}
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/**
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* Updates the page while the file is being uploaded.
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*
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* @param {File} file
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* @param {HTMLLIElement} row
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*/
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function uploadFile(file, row) {
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var bar = row.querySelector('.file-progress');
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var percentIndicator = row.querySelector('.progress-percent');
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var xhr = new XMLHttpRequest();
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xhr.open('POST', 'upload.php');
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xhr['row'] = row;
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xhr['bar'] = bar;
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xhr['percent'] = percentIndicator;
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xhr.upload['bar'] = bar;
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xhr.upload['percent'] = percentIndicator;
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xhr.addEventListener('load', handleUploadComplete, false);
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xhr.upload.onprogress = handleUploadProgress;
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var form = new FormData();
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form.append('files[]', file);
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xhr.send(form);
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}
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/**
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* Prevents the browser for allowing the normal actions associated with an event.
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* This is used by event handlers to allow custom functionality without
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* having to worry about the other consequences of that action.
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*
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* @param {Event} evt
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*/
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function stopDefaultEvent(evt) {
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evt.stopPropagation();
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evt.preventDefault();
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}
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/**
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* Adds 1 to the state and changes the text.
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*
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* @param {Object} state
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* @param {HTMLButtonElement} element
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* @param {DragEvent} evt
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*/
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function handleDrag(state, element, evt) {
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stopDefaultEvent(evt);
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if (state.dragCount == 1) {
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element.textContent = 'Drop it here~';
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}
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state.dragCount += 1;
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}
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/**
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* Subtracts 1 from the state and changes the text back.
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*
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* @param {Object} state
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* @param {HTMLButtonElement} element
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* @param {DragEvent} evt
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*/
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function handleDragAway(state, element, evt) {
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stopDefaultEvent(evt);
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state.dragCount -= 1;
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if (state.dragCount == 0) {
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element.textContent = 'Select or drop file(s)';
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}
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}
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/**
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* Prepares files for uploading after being added via drag-drop.
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*
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* @param {Object} state
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* @param {HTMLButtonElement} element
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* @param {DragEvent} evt
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*/
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function handleDragDrop(state, element, evt) {
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stopDefaultEvent(evt);
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handleDragAway(state, element, evt);
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var len = evt.dataTransfer.files.length;
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for (var i = 0; i < len; i++) {
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var file = evt.dataTransfer.files[i];
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var row = addRow(file);
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uploadFile(file, row);
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}
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}
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/**
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* Prepares the files to be uploaded when they're added to the <input> element.
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*
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* @param {InputEvent} evt
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*/
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function uploadFiles(evt) {
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var len = evt.target.files.length;
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// For each file, make a row, and upload the file.
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for (var i = 0; i < len; i++) {
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var file = evt.target.files[i];
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var row = addRow(file);
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uploadFile(file, row);
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}
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}
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/**
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* Opens up a "Select files.." dialog window to allow users to select files to upload.
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*
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* @param {HTMLInputElement} target
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* @param {InputEvent} evt
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*/
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function selectFiles(target, evt) {
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stopDefaultEvent(evt);
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target.click();
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}
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/* Set-up the event handlers for the <button>, <input> and the window itself
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and also set the "js" class on selector "#upload-form", presumably to
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allow custom styles for clients running javascript. */
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var state = { dragCount: 0 };
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var uploadButton = document.getElementById('upload-btn');
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window.addEventListener('dragenter', handleDrag.bind(this, state, uploadButton), false);
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window.addEventListener('dragleave', handleDragAway.bind(this, state, uploadButton), false);
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window.addEventListener('drop', handleDragAway.bind(this, state, uploadButton), false);
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window.addEventListener('dragover', stopDefaultEvent, false);
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var uploadInput = document.getElementById('upload-input');
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uploadInput.addEventListener('change', uploadFiles);
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uploadButton.addEventListener('click', selectFiles.bind(this, uploadInput));
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uploadButton.addEventListener('drop', handleDragDrop.bind(this, state, uploadButton), false);
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document.getElementById('upload-form').classList.add('js');
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});
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