Rewrite markdown editor in vanilla Javascript
This commit is contained in:
Frederic Guillot
@@ -1,158 +1,140 @@
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Vue.component('texteditor', {
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props: ['text', 'name', 'labelPreview', 'labelWrite', 'placeholder', 'css', 'tabindex', 'required', 'autofocus'],
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template:
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'<div class="text-editor">' +
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'<div class="text-editor-toolbar">' +
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'<button v-if="!preview" v-on:click.prevent="togglePreview"><i class="fa fa-fw fa-eye"></i>{{ labelPreview }}</button>' +
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'<button v-if="preview" v-on:click.prevent="toggleEditor"><i class="fa fa-fw fa-pencil-square-o"></i>{{ labelWrite }}</button>' +
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'<button :disabled="isPreview" v-on:click.prevent="insertBoldTag"><i class="fa fa-bold fa-fw"></i></button>' +
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'<button :disabled="isPreview" v-on:click.prevent="insertItalicTag"><i class="fa fa-italic fa-fw"></i></button>' +
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'<button :disabled="isPreview" v-on:click.prevent="insertStrikethroughTag"><i class="fa fa-strikethrough fa-fw"></i></button>' +
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'<button :disabled="isPreview" v-on:click.prevent="insertQuoteTag"><i class="fa fa-quote-right fa-fw"></i></button>' +
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'<button :disabled="isPreview" v-on:click.prevent="insertBulletListTag"><i class="fa fa-list-ul fa-fw"></i></button>' +
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'<button :disabled="isPreview" v-on:click.prevent="insertCodeTag"><i class="fa fa-code fa-fw"></i></button>' +
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'</div>' +
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'<div v-show="!preview" class="text-editor-write-area">' +
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'<textarea ' +
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'v-model="text" ' +
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'name="{{ name }}" ' +
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'id="{{ getId }}" ' +
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'class="{{ css }}" ' +
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'tabindex="{{ tabindex }}" ' +
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':autofocus="hasAutofocus" ' +
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'placeholder="{{ placeholder }}" ' +
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'></textarea>' +
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'</div>' +
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'<div v-show="preview" class="text-editor-preview-area markdown">{{{ renderedText }}}</div>' +
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'</div>'
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,
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data: function() {
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return {
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id: null,
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preview: false,
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renderedText: '',
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textarea: null,
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selectionStart: 0,
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selectionEnd: 0
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};
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},
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ready: function() {
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this.textarea = document.getElementById(this.id);
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},
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computed: {
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hasAutofocus: function() {
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return this.autofocus === '1';
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},
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isPreview: function() {
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return this.preview;
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},
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getId: function() {
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if (! this.id) {
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var i = 0;
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var uniqueId;
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KB.component('text-editor', function (containerElement, options) {
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var textarea, viewModeElement, writeModeElement, previewElement, selectionStart, selectionEnd;
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while (true) {
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i++;
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uniqueId = 'text-editor-textarea-' + i;
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this.render = function() {
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writeModeElement = buildWriteMode();
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viewModeElement = buildViewMode();
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if (! document.getElementById(uniqueId)) {
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break;
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}
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containerElement.appendChild(KB.el('div')
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.attr('class', 'text-editor')
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.add(viewModeElement)
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.add(writeModeElement)
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.build());
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};
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function buildViewMode() {
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var toolbarElement = KB.el('div')
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.attr('class', 'text-editor-toolbar')
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.for('a', [
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{href: '#', html: '<i class="fa fa-pencil-square-o fa-fw"></i> ' + options.labelWrite, click: function() { toggleViewMode(); }}
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])
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.build();
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previewElement = KB.el('div')
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.attr('class', 'text-editor-preview-area markdown')
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.build();
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return KB.el('div')
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.attr('class', 'text-editor-view-mode')
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.add(toolbarElement)
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.add(previewElement)
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.hide()
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.build();
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}
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function buildWriteMode() {
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var toolbarElement = KB.el('div')
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.attr('class', 'text-editor-toolbar')
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.for('a', [
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{href: '#', html: '<i class="fa fa-eye fa-fw"></i> ' + options.labelPreview, click: function() { toggleViewMode(); }},
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{href: '#', html: '<i class="fa fa-bold fa-fw"></i>', click: function() { insertEnclosedTag('**'); }},
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{href: '#', html: '<i class="fa fa-italic fa-fw"></i>', click: function() { insertEnclosedTag('_'); }},
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{href: '#', html: '<i class="fa fa-strikethrough fa-fw"></i>', click: function() { insertEnclosedTag('~~'); }},
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{href: '#', html: '<i class="fa fa-quote-right fa-fw"></i>', click: function() { insertPrependTag('> '); }},
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{href: '#', html: '<i class="fa fa-list-ul fa-fw"></i>', click: function() { insertPrependTag('* '); }},
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{href: '#', html: '<i class="fa fa-code fa-fw"></i>', click: function() { insertBlockTag('```'); }}
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])
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.build();
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textarea = KB.el('textarea')
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.attr('name', options.name)
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.attr('tabindex', options.tabindex || '-1')
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.attr('required', options.required || false)
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.attr('autofocus', options.autofocus || null)
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.attr('placeholder', options.placeholder || '')
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.text(options.text)
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.build();
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return KB.el('div')
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.attr('class', 'text-editor-write-mode')
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.add(toolbarElement)
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.add(textarea)
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.build();
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}
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function toggleViewMode() {
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KB.el(previewElement).html(marked(textarea.value, {sanitize: true}));
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KB.el(viewModeElement).toggle();
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KB.el(writeModeElement).toggle();
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}
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function getSelectedText() {
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return textarea.value.substring(textarea.selectionStart, textarea.selectionEnd);
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}
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function replaceTextRange(s, start, end, substitute) {
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return s.substring(0, start) + substitute + s.substring(end);
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}
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function insertEnclosedTag(tag) {
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var selectedText = getSelectedText();
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insertText(tag + selectedText + tag);
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setCursorBeforeClosingTag(tag);
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}
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function insertBlockTag(tag) {
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var selectedText = getSelectedText();
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insertText('\n' + tag + '\n' + selectedText + '\n' + tag);
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setCursorBeforeClosingTag(tag, 2);
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}
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function insertPrependTag(tag) {
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var selectedText = getSelectedText();
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if (selectedText.indexOf('\n') === -1) {
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insertText('\n' + tag + selectedText);
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} else {
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var lines = selectedText.split('\n');
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for (var i = 0; i < lines.length; i++) {
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if (lines[i].indexOf(tag) === -1) {
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lines[i] = tag + lines[i];
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}
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this.id = uniqueId;
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}
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return this.id;
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}
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},
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methods: {
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toggleEditor: function() {
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this.preview = false;
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},
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togglePreview: function() {
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this.preview = true;
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this.renderedText = marked(this.text, {sanitize: true});
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},
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insertBoldTag: function() {
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this.insertEnclosedTag('**');
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},
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insertItalicTag: function() {
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this.insertEnclosedTag('_');
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},
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insertStrikethroughTag: function() {
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this.insertEnclosedTag('~~');
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},
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insertQuoteTag: function() {
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this.insertPrependTag('> ');
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},
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insertBulletListTag: function() {
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this.insertPrependTag('* ');
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},
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insertCodeTag: function() {
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this.insertBlockTag('```');
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},
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replaceTextRange: function(s, start, end, substitute) {
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return s.substring(0, start) + substitute + s.substring(end);
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},
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getSelectedText: function() {
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return this.text.substring(this.textarea.selectionStart, this.textarea.selectionEnd);
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},
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insertEnclosedTag: function(tag) {
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var selectedText = this.getSelectedText();
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this.insertText(tag + selectedText + tag);
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this.setCursorBeforeClosingTag(tag);
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},
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insertPrependTag: function(tag) {
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var selectedText = this.getSelectedText();
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if (selectedText.indexOf('\n') === -1) {
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this.insertText('\n' + tag + selectedText);
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} else {
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var lines = selectedText.split('\n');
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for (var i = 0; i < lines.length; i++) {
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if (lines[i].indexOf(tag) === -1) {
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lines[i] = tag + lines[i];
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}
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}
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this.insertText(lines.join('\n'));
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}
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},
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insertBlockTag: function(tag) {
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var selectedText = this.getSelectedText();
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this.insertText('\n' + tag + '\n' + selectedText + '\n' + tag);
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this.setCursorBeforeClosingTag(tag, 2);
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},
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insertText: function(replacedText) {
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var result = false;
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this.selectionStart = this.textarea.selectionStart;
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this.selectionEnd = this.textarea.selectionEnd;
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this.textarea.focus();
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if (document.queryCommandSupported('insertText')) {
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result = document.execCommand('insertText', false, replacedText);
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}
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if (! result) {
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try {
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document.execCommand("ms-beginUndoUnit");
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} catch (error) {}
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this.textarea.value = this.replaceTextRange(this.text, this.textarea.selectionStart, this.textarea.selectionEnd, replacedText);
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try {
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document.execCommand("ms-endUndoUnit");
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} catch (error) {}
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}
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},
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setCursorBeforeClosingTag: function(tag, offset) {
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var position = this.selectionEnd + tag.length + offset;
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this.textarea.setSelectionRange(position, position);
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insertText(lines.join('\n'));
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}
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}
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function insertText(replacedText) {
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var result = false;
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selectionStart = textarea.selectionStart;
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selectionEnd = textarea.selectionEnd;
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textarea.focus();
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if (document.queryCommandSupported('insertText')) {
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result = document.execCommand('insertText', false, replacedText);
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}
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if (! result) {
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try {
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document.execCommand('ms-beginUndoUnit');
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} catch (error) {}
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textarea.value = replaceTextRange(text, textarea.selectionStart, textarea.selectionEnd, replacedText);
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try {
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document.execCommand('ms-endUndoUnit');
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} catch (error) {}
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}
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}
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function setCursorBeforeClosingTag(tag, offset) {
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offset = offset || 0;
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var position = selectionEnd + tag.length + offset;
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textarea.setSelectionRange(position, position);
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}
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});
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