debian-mirror-gitlab/app/assets/javascripts/behaviors/preview_markdown.js

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JavaScript
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/* eslint-disable func-names */
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import $ from 'jquery';
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import createFlash from '~/flash';
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import axios from '~/lib/utils/axios_utils';
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import { __ } from '~/locale';
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// MarkdownPreview
//
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// Handles toggling the "Write" and "Preview" tab clicks, rendering the preview
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// (including the explanation of quick actions), and showing a warning when
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// more than `x` users are referenced.
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//
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let lastTextareaHeight;
let lastTextareaPreviewed;
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function MarkdownPreview() {}
// Minimum number of users referenced before triggering a warning
MarkdownPreview.prototype.referenceThreshold = 10;
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MarkdownPreview.prototype.emptyMessage = __('Nothing to preview.');
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MarkdownPreview.prototype.ajaxCache = {};
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MarkdownPreview.prototype.showPreview = function ($form) {
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const preview = $form.find('.js-md-preview');
const url = preview.data('url');
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if (preview.hasClass('md-preview-loading')) {
return;
}
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const mdText = $form.find('textarea.markdown-area').val();
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if (mdText === undefined) {
return;
}
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if (mdText.trim().length === 0) {
preview.text(this.emptyMessage);
this.hideReferencedUsers($form);
} else {
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preview.addClass('md-preview-loading').text(__('Loading...'));
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this.fetchMarkdownPreview(mdText, url, (response) => {
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let body;
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if (response.body.length > 0) {
({ body } = response);
} else {
body = this.emptyMessage;
}
preview.removeClass('md-preview-loading').html(body);
preview.renderGFM();
this.renderReferencedUsers(response.references.users, $form);
if (response.references.commands) {
this.renderReferencedCommands(response.references.commands, $form);
}
});
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}
};
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MarkdownPreview.prototype.fetchMarkdownPreview = function (text, url, success) {
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if (!url) {
return;
}
if (text === this.ajaxCache.text) {
success(this.ajaxCache.response);
return;
}
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axios
.post(url, {
text,
})
.then(({ data }) => {
this.ajaxCache = {
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text,
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response: data,
};
success(data);
})
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.catch(() =>
createFlash({
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message: __('An error occurred while fetching Markdown preview'),
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}),
);
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};
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MarkdownPreview.prototype.hideReferencedUsers = function ($form) {
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$form.find('.referenced-users').hide();
};
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MarkdownPreview.prototype.renderReferencedUsers = function (users, $form) {
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const referencedUsers = $form.find('.referenced-users');
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if (referencedUsers.length) {
if (users.length >= this.referenceThreshold) {
referencedUsers.show();
referencedUsers.find('.js-referenced-users-count').text(users.length);
} else {
referencedUsers.hide();
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}
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}
};
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MarkdownPreview.prototype.hideReferencedCommands = function ($form) {
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$form.find('.referenced-commands').hide();
};
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MarkdownPreview.prototype.renderReferencedCommands = function (commands, $form) {
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const referencedCommands = $form.find('.referenced-commands');
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if (commands.length > 0) {
referencedCommands.html(commands);
referencedCommands.show();
} else {
referencedCommands.html('');
referencedCommands.hide();
}
};
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const markdownPreview = new MarkdownPreview();
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const previewButtonSelector = '.js-md-preview-button';
const writeButtonSelector = '.js-md-write-button';
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lastTextareaPreviewed = null;
const markdownToolbar = $('.md-header-toolbar');
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$(document).on('markdown-preview:show', (e, $form) => {
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if (!$form) {
return;
}
lastTextareaPreviewed = $form.find('textarea.markdown-area');
lastTextareaHeight = lastTextareaPreviewed.height();
// toggle tabs
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$form.find(writeButtonSelector).parent().removeClass('active');
$form.find(previewButtonSelector).parent().addClass('active');
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// toggle content
$form.find('.md-write-holder').hide();
$form.find('.md-preview-holder').show();
markdownToolbar.removeClass('active');
markdownPreview.showPreview($form);
});
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$(document).on('markdown-preview:hide', (e, $form) => {
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if (!$form) {
return;
}
lastTextareaPreviewed = null;
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if (lastTextareaHeight) {
$form.find('textarea.markdown-area').height(lastTextareaHeight);
}
// toggle tabs
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$form.find(writeButtonSelector).parent().addClass('active');
$form.find(previewButtonSelector).parent().removeClass('active');
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// toggle content
$form.find('.md-write-holder').show();
$form.find('textarea.markdown-area').focus();
$form.find('.md-preview-holder').hide();
markdownToolbar.addClass('active');
markdownPreview.hideReferencedCommands($form);
});
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$(document).on('markdown-preview:toggle', (e, keyboardEvent) => {
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let $target;
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$target = $(keyboardEvent.target);
if ($target.is('textarea.markdown-area')) {
$(document).triggerHandler('markdown-preview:show', [$target.closest('form')]);
keyboardEvent.preventDefault();
} else if (lastTextareaPreviewed) {
$target = lastTextareaPreviewed;
$(document).triggerHandler('markdown-preview:hide', [$target.closest('form')]);
keyboardEvent.preventDefault();
}
});
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$(document).on('click', previewButtonSelector, function (e) {
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e.preventDefault();
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const $form = $(this).closest('form');
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$(document).triggerHandler('markdown-preview:show', [$form]);
});
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$(document).on('click', writeButtonSelector, function (e) {
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e.preventDefault();
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const $form = $(this).closest('form');
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$(document).triggerHandler('markdown-preview:hide', [$form]);
});
export default MarkdownPreview;