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https://github.com/BookStackApp/BookStack.git
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Migrated editor inputs to non-angular JS
This commit is contained in:
Dan Brown
293
resources/assets/js/components/markdown-editor.js
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293
resources/assets/js/components/markdown-editor.js
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@ -0,0 +1,293 @@
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const MarkdownIt = require("markdown-it");
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const mdTasksLists = require('markdown-it-task-lists');
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const code = require('../code');
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class MarkdownEditor {
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constructor(elem) {
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this.elem = elem;
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this.markdown = new MarkdownIt({html: true});
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this.markdown.use(mdTasksLists, {label: true});
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this.display = this.elem.querySelector('.markdown-display');
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this.input = this.elem.querySelector('textarea');
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this.htmlInput = this.elem.querySelector('input[name=html]');
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this.cm = code.markdownEditor(this.input);
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this.onMarkdownScroll = this.onMarkdownScroll.bind(this);
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this.init();
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}
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init() {
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// Prevent markdown display link click redirect
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this.display.addEventListener('click', event => {
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let link = event.target.closest('a');
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if (link === null) return;
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event.preventDefault();
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window.open(link.getAttribute('href'));
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});
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// Button actions
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this.elem.addEventListener('click', event => {
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let button = event.target.closest('button[data-action]');
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if (button === null) return;
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let action = button.getAttribute('data-action');
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if (action === 'insertImage') this.actionInsertImage();
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if (action === 'insertLink') this.actionShowLinkSelector();
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});
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window.$events.listen('editor-markdown-update', value => {
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this.cm.setValue(value);
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this.updateAndRender();
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});
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this.codeMirrorSetup();
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}
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// Update the input content and render the display.
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updateAndRender() {
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let content = this.cm.getValue();
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this.input.value = content;
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let html = this.markdown.render(content);
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window.$events.emit('editor-html-change', html);
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window.$events.emit('editor-markdown-change', content);
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this.display.innerHTML = html;
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this.htmlInput.value = html;
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}
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onMarkdownScroll(lineCount) {
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let elems = this.display.children;
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if (elems.length <= lineCount) return;
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let topElem = (lineCount === -1) ? elems[elems.length-1] : elems[lineCount];
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// TODO - Replace jQuery
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$(this.display).animate({
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scrollTop: topElem.offsetTop
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}, {queue: false, duration: 200, easing: 'linear'});
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}
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codeMirrorSetup() {
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let cm = this.cm;
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// Custom key commands
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let metaKey = code.getMetaKey();
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const extraKeys = {};
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// Insert Image shortcut
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extraKeys[`${metaKey}-Alt-I`] = function(cm) {
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let selectedText = cm.getSelection();
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let newText = ``;
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let cursorPos = cm.getCursor('from');
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cm.replaceSelection(newText);
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cm.setCursor(cursorPos.line, cursorPos.ch + newText.length -1);
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};
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// Save draft
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extraKeys[`${metaKey}-S`] = cm => {window.$events.emit('editor-save-draft')};
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// Show link selector
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extraKeys[`Shift-${metaKey}-K`] = cm => {this.actionShowLinkSelector()};
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// Insert Link
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extraKeys[`${metaKey}-K`] = cm => {insertLink()};
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// FormatShortcuts
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extraKeys[`${metaKey}-1`] = cm => {replaceLineStart('##');};
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extraKeys[`${metaKey}-2`] = cm => {replaceLineStart('###');};
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extraKeys[`${metaKey}-3`] = cm => {replaceLineStart('####');};
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extraKeys[`${metaKey}-4`] = cm => {replaceLineStart('#####');};
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extraKeys[`${metaKey}-5`] = cm => {replaceLineStart('');};
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extraKeys[`${metaKey}-d`] = cm => {replaceLineStart('');};
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extraKeys[`${metaKey}-6`] = cm => {replaceLineStart('>');};
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extraKeys[`${metaKey}-q`] = cm => {replaceLineStart('>');};
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extraKeys[`${metaKey}-7`] = cm => {wrapSelection('\n```\n', '\n```');};
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extraKeys[`${metaKey}-8`] = cm => {wrapSelection('`', '`');};
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extraKeys[`Shift-${metaKey}-E`] = cm => {wrapSelection('`', '`');};
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extraKeys[`${metaKey}-9`] = cm => {wrapSelection('<p class="callout info">', '</p>');};
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cm.setOption('extraKeys', extraKeys);
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// Update data on content change
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cm.on('change', (instance, changeObj) => {
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this.updateAndRender();
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});
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// Handle scroll to sync display view
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cm.on('scroll', instance => {
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// Thanks to http://liuhao.im/english/2015/11/10/the-sync-scroll-of-markdown-editor-in-javascript.html
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let scroll = instance.getScrollInfo();
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let atEnd = scroll.top + scroll.clientHeight === scroll.height;
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if (atEnd) {
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this.onMarkdownScroll(-1);
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return;
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}
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let lineNum = instance.lineAtHeight(scroll.top, 'local');
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let range = instance.getRange({line: 0, ch: null}, {line: lineNum, ch: null});
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let parser = new DOMParser();
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let doc = parser.parseFromString(this.markdown.render(range), 'text/html');
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let totalLines = doc.documentElement.querySelectorAll('body > *');
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this.onMarkdownScroll(totalLines.length);
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});
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// Handle image paste
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cm.on('paste', (cm, event) => {
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if (!event.clipboardData || !event.clipboardData.items) return;
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for (let i = 0; i < event.clipboardData.items.length; i++) {
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uploadImage(event.clipboardData.items[i].getAsFile());
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}
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});
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// Handle images on drag-drop
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cm.on('drop', (cm, event) => {
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event.stopPropagation();
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event.preventDefault();
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let cursorPos = cm.coordsChar({left: event.pageX, top: event.pageY});
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cm.setCursor(cursorPos);
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if (!event.dataTransfer || !event.dataTransfer.files) return;
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for (let i = 0; i < event.dataTransfer.files.length; i++) {
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uploadImage(event.dataTransfer.files[i]);
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}
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});
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// Helper to replace editor content
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function replaceContent(search, replace) {
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let text = cm.getValue();
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let cursor = cm.listSelections();
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cm.setValue(text.replace(search, replace));
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cm.setSelections(cursor);
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}
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// Helper to replace the start of the line
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function replaceLineStart(newStart) {
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let cursor = cm.getCursor();
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let lineContent = cm.getLine(cursor.line);
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let lineLen = lineContent.length;
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let lineStart = lineContent.split(' ')[0];
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// Remove symbol if already set
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if (lineStart === newStart) {
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lineContent = lineContent.replace(`${newStart} `, '');
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cm.replaceRange(lineContent, {line: cursor.line, ch: 0}, {line: cursor.line, ch: lineLen});
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cm.setCursor({line: cursor.line, ch: cursor.ch - (newStart.length + 1)});
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return;
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}
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let alreadySymbol = /^[#>`]/.test(lineStart);
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let posDif = 0;
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if (alreadySymbol) {
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posDif = newStart.length - lineStart.length;
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lineContent = lineContent.replace(lineStart, newStart).trim();
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} else if (newStart !== '') {
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posDif = newStart.length + 1;
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lineContent = newStart + ' ' + lineContent;
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}
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cm.replaceRange(lineContent, {line: cursor.line, ch: 0}, {line: cursor.line, ch: lineLen});
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cm.setCursor({line: cursor.line, ch: cursor.ch + posDif});
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}
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function wrapLine(start, end) {
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let cursor = cm.getCursor();
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let lineContent = cm.getLine(cursor.line);
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let lineLen = lineContent.length;
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let newLineContent = lineContent;
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if (lineContent.indexOf(start) === 0 && lineContent.slice(-end.length) === end) {
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newLineContent = lineContent.slice(start.length, lineContent.length - end.length);
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} else {
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newLineContent = `${start}${lineContent}${end}`;
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}
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cm.replaceRange(newLineContent, {line: cursor.line, ch: 0}, {line: cursor.line, ch: lineLen});
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cm.setCursor({line: cursor.line, ch: cursor.ch + start.length});
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}
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function wrapSelection(start, end) {
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let selection = cm.getSelection();
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if (selection === '') return wrapLine(start, end);
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let newSelection = selection;
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let frontDiff = 0;
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let endDiff = 0;
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if (selection.indexOf(start) === 0 && selection.slice(-end.length) === end) {
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newSelection = selection.slice(start.length, selection.length - end.length);
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endDiff = -(end.length + start.length);
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} else {
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newSelection = `${start}${selection}${end}`;
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endDiff = start.length + end.length;
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}
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let selections = cm.listSelections()[0];
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cm.replaceSelection(newSelection);
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let headFirst = selections.head.ch <= selections.anchor.ch;
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selections.head.ch += headFirst ? frontDiff : endDiff;
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selections.anchor.ch += headFirst ? endDiff : frontDiff;
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cm.setSelections([selections]);
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}
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// Handle image upload and add image into markdown content
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function uploadImage(file) {
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if (file === null || file.type.indexOf('image') !== 0) return;
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let ext = 'png';
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if (file.name) {
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let fileNameMatches = file.name.match(/\.(.+)$/);
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if (fileNameMatches.length > 1) ext = fileNameMatches[1];
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}
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// Insert image into markdown
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let id = "image-" + Math.random().toString(16).slice(2);
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let placeholderImage = window.baseUrl(`/loading.gif#upload${id}`);
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let selectedText = cm.getSelection();
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let placeHolderText = ``;
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cm.replaceSelection(placeHolderText);
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let remoteFilename = "image-" + Date.now() + "." + ext;
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let formData = new FormData();
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formData.append('file', file, remoteFilename);
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window.$http.post('/images/gallery/upload', formData).then(resp => {
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replaceContent(placeholderImage, resp.data.thumbs.display);
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}).catch(err => {
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events.emit('error', trans('errors.image_upload_error'));
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replaceContent(placeHolderText, selectedText);
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console.log(err);
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});
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}
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function insertLink() {
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let cursorPos = cm.getCursor('from');
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let selectedText = cm.getSelection() || '';
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let newText = `[${selectedText}]()`;
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cm.focus();
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cm.replaceSelection(newText);
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let cursorPosDiff = (selectedText === '') ? -3 : -1;
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cm.setCursor(cursorPos.line, cursorPos.ch + newText.length+cursorPosDiff);
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}
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this.updateAndRender();
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}
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actionInsertImage() {
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let cursorPos = this.cm.getCursor('from');
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window.ImageManager.show(image => {
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let selectedText = this.cm.getSelection();
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let newText = "![" + (selectedText || image.name) + "](" + image.thumbs.display + ")";
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this.cm.focus();
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this.cm.replaceSelection(newText);
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this.cm.setCursor(cursorPos.line, cursorPos.ch + newText.length);
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});
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}
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// Show the popup link selector and insert a link when finished
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actionShowLinkSelector() {
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let cursorPos = this.cm.getCursor('from');
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window.EntitySelectorPopup.show(entity => {
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let selectedText = this.cm.getSelection() || entity.name;
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let newText = `[${selectedText}](${entity.link})`;
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this.cm.focus();
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this.cm.replaceSelection(newText);
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this.cm.setCursor(cursorPos.line, cursorPos.ch + newText.length);
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});
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}
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}
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module.exports = MarkdownEditor ;
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