168 lines
5 KiB
JavaScript
168 lines
5 KiB
JavaScript
/* eslint-disable func-names, no-var, object-shorthand, comma-dangle, prefer-arrow-callback */
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// MarkdownPreview
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//
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// Handles toggling the "Write" and "Preview" tab clicks, rendering the preview,
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// and showing a warning when more than `x` users are referenced.
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//
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(function () {
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var lastTextareaPreviewed;
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var lastTextareaHeight = null;
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var markdownPreview;
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var previewButtonSelector;
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var writeButtonSelector;
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window.MarkdownPreview = (function () {
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function MarkdownPreview() {}
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// Minimum number of users referenced before triggering a warning
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MarkdownPreview.prototype.referenceThreshold = 10;
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MarkdownPreview.prototype.ajaxCache = {};
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MarkdownPreview.prototype.showPreview = function ($form) {
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var mdText;
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var preview = $form.find('.js-md-preview');
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if (preview.hasClass('md-preview-loading')) {
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return;
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}
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mdText = $form.find('textarea.markdown-area').val();
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if (mdText.trim().length === 0) {
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preview.text('Nothing to preview.');
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this.hideReferencedUsers($form);
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} else {
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preview.addClass('md-preview-loading').text('Loading...');
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this.fetchMarkdownPreview(mdText, (function (response) {
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preview.removeClass('md-preview-loading').html(response.body);
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preview.renderGFM();
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this.renderReferencedUsers(response.references.users, $form);
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}).bind(this));
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}
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};
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MarkdownPreview.prototype.fetchMarkdownPreview = function (text, success) {
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if (!window.preview_markdown_path) {
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return;
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}
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if (text === this.ajaxCache.text) {
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success(this.ajaxCache.response);
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return;
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}
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$.ajax({
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type: 'POST',
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url: window.preview_markdown_path,
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data: {
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text: text
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},
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dataType: 'json',
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success: (function (response) {
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this.ajaxCache = {
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text: text,
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response: response
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};
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success(response);
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}).bind(this)
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});
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};
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MarkdownPreview.prototype.hideReferencedUsers = function ($form) {
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$form.find('.referenced-users').hide();
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};
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MarkdownPreview.prototype.renderReferencedUsers = function (users, $form) {
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var referencedUsers;
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referencedUsers = $form.find('.referenced-users');
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if (referencedUsers.length) {
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if (users.length >= this.referenceThreshold) {
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referencedUsers.show();
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referencedUsers.find('.js-referenced-users-count').text(users.length);
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} else {
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referencedUsers.hide();
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}
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}
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};
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return MarkdownPreview;
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}());
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markdownPreview = new window.MarkdownPreview();
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previewButtonSelector = '.js-md-preview-button';
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writeButtonSelector = '.js-md-write-button';
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lastTextareaPreviewed = null;
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$.fn.setupMarkdownPreview = function () {
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var $form = $(this);
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$form.find('textarea.markdown-area').on('input', function () {
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markdownPreview.hideReferencedUsers($form);
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});
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};
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$(document).on('markdown-preview:show', function (e, $form) {
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if (!$form) {
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return;
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}
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lastTextareaPreviewed = $form.find('textarea.markdown-area');
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lastTextareaHeight = lastTextareaPreviewed.height();
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// toggle tabs
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$form.find(writeButtonSelector).parent().removeClass('active');
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$form.find(previewButtonSelector).parent().addClass('active');
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// toggle content
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$form.find('.md-write-holder').hide();
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$form.find('.md-preview-holder').show();
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markdownPreview.showPreview($form);
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});
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$(document).on('markdown-preview:hide', function (e, $form) {
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if (!$form) {
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return;
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}
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lastTextareaPreviewed = null;
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if (lastTextareaHeight) {
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$form.find('textarea.markdown-area').height(lastTextareaHeight);
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}
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// toggle tabs
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$form.find(writeButtonSelector).parent().addClass('active');
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$form.find(previewButtonSelector).parent().removeClass('active');
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// toggle content
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$form.find('.md-write-holder').show();
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$form.find('textarea.markdown-area').focus();
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$form.find('.md-preview-holder').hide();
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});
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$(document).on('markdown-preview:toggle', function (e, keyboardEvent) {
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var $target;
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$target = $(keyboardEvent.target);
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if ($target.is('textarea.markdown-area')) {
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$(document).triggerHandler('markdown-preview:show', [$target.closest('form')]);
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keyboardEvent.preventDefault();
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} else if (lastTextareaPreviewed) {
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$target = lastTextareaPreviewed;
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$(document).triggerHandler('markdown-preview:hide', [$target.closest('form')]);
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keyboardEvent.preventDefault();
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}
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});
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$(document).on('click', previewButtonSelector, function (e) {
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var $form;
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e.preventDefault();
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$form = $(this).closest('form');
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$(document).triggerHandler('markdown-preview:show', [$form]);
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});
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$(document).on('click', writeButtonSelector, function (e) {
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var $form;
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e.preventDefault();
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$form = $(this).closest('form');
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$(document).triggerHandler('markdown-preview:hide', [$form]);
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});
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}());
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