1 files changed, 13 insertions, 1 deletions
diff --git a/app/assets/javascripts/preview_markdown.js b/app/assets/javascripts/preview_markdown.js
index 0e973cab4d2..0964baf8954 100644
--- a/app/assets/javascripts/preview_markdown.js
+++ b/app/assets/javascripts/preview_markdown.js
@@ -28,12 +28,16 @@ MarkdownPreview.prototype.ajaxCache = {};
 
 MarkdownPreview.prototype.showPreview = function ($form) {
   var mdText;
+  var markdownVersion;
+  var url;
   var preview = $form.find('.js-md-preview');
-  var url = preview.data('url');
   if (preview.hasClass('md-preview-loading')) {
     return;
   }
+
   mdText = $form.find('textarea.markdown-area').val();
+  markdownVersion = $form.attr('data-markdown-version');
+  url = this.versionedPreviewPath(preview.data('url'), markdownVersion);
 
   if (mdText.trim().length === 0) {
     preview.text(this.emptyMessage);
@@ -59,6 +63,14 @@ MarkdownPreview.prototype.showPreview = function ($form) {
   }
 };
 
+MarkdownPreview.prototype.versionedPreviewPath = function (markdownPreviewPath, markdownVersion) {
+  if (typeof markdownVersion === 'undefined') {
+    return markdownPreviewPath;
+  }
+
+  return `${markdownPreviewPath}${markdownPreviewPath.indexOf('?') === -1 ? '?' : '&'}markdown_version=${markdownVersion}`;
+};
+
 MarkdownPreview.prototype.fetchMarkdownPreview = function (text, url, success) {
   if (!url) {
     return;