btw: I've used the word "item" in the language file, and not "article".
I'll create two similar PRs for com_contact + com_newsfeeds soon, so we can reuse the language string...

It only works for saved articles (that have an ID)

Not 100% true - it only works for saved articles that have a status of published or archived.

Also the icon needs a bit of css love as the colour has little contrast to the background which is an a11y fail and the onhover is almost the same as the background

This PR is wrong as I explained here:
#10282 (comment)

FYI, this is the way we got the correct link using editor-xtd/article
6c97f43

Also we get a fatal error in multilang

( ! ) Fatal error: Call to undefined function array_column() in /Applications/MAMP/htdocs/testwindows/trunkgitnew/plugins/system/redirect/redirect.php on line 170

@pe7er

Here is a diff which will work when sef on or off, in multilang or not.
As JRoute does not work yet from admin to site, it will use a non-sef url.
I guess it is not very important as it is only to check the look of the article in frontend.
The Itemid is the one of the Home page for the language used by the item.
It will be very easy to modify when JRoute will work in admin.
No new lang string necessary as it picks the article title.

diff --git a/administrator/components/com_content/views/article/view.html.php b/administrator/components/com_content/views/article/view.html.php
index 9f58183..9e67513 100644
--- a/administrator/components/com_content/views/article/view.html.php
+++ b/administrator/components/com_content/views/article/view.html.php
@@ -87,6 +87,64 @@
        $canDo = $this->canDo;

+       $linkArticle = "";
+
+       if (!$isNew)
+       {
+            $lang = '';
+            $sef  = '';
+
+            // Get the home Itemid for the language
+           $db = JFactory::getDbo();
+           $query = $db->getQuery(true);
+
+           $query->select('id')
+               ->from($db->qn('#__menu'))
+               ->where($db->qn('home') . '= 1')
+               ->where($db->qn('published') . '= 1')
+               ->where($db->qn('client_id') . '= 0');
+
+           if (JLanguageMultilang::isEnabled())
+           {
+               $query->where($db->qn('language') . ' = ' . $db->q($this->item->language));
+           }
+           else
+           {
+               $query->where($db->qn('language') . ' = ' . $db->q('*'));
+           }
+           $db->setQuery($query);
+
+           $Itemid = '&Itemid=' . (int) $db->loadResult();
+
+           if ($this->item->language && JLanguageMultilang::isEnabled())
+           {
+               // Get the sef prefix for the language
+               $query->clear()
+                   ->select('sef')
+                   ->from($db->qn('#__languages'))
+                   ->where($db->qn('published') . '= 1')
+                   ->where($db->qn('lang_code') . ' = ' . $db->q($this->item->language));
+               $db->setQuery($query);
+
+               $sef = $db->loadResult();
+
+               if ($this->item->language != '*')
+               {
+                   $lang = '&lang=' . $sef;
+               }
+               else
+               {
+                   $lang = "";
+               }
+           }
+
+           $linkArticle = '<a href="' .
+                   JURI::root() . 'index.php?option=com_content&amp;view=article&amp;id=' . (int) $this->item->id
+                   . '&amp;catid=' . (int) $this->item->catid . $lang . $Itemid . '" title="' . $this->item->title
+                   . '" target="_blank"><span class="icon-out-2"></span></a>';
+       }
+
        JToolbarHelper::title(
-           JText::_('COM_CONTENT_PAGE_' . ($checkedOut ? 'VIEW_ARTICLE' : ($isNew ? 'ADD_ARTICLE' : 'EDIT_ARTICLE'))),
+           JText::_('COM_CONTENT_PAGE_' . ($checkedOut ? 'VIEW_ARTICLE' : ($isNew ? 'ADD_ARTICLE' : 'EDIT_ARTICLE')))
+           . " " . $linkArticle,
            'pencil-2 article-add'
        );

@infograf768 log a separate (release blocking) issue for the array_column() error. It's unrelated to this patch and it is a release blocker because per the documentation it only exists as of PHP 5.5. Either a polyfill for the method needs to be implemented (add the symfony/polyfill-php55 package via Composer) or the code rewritten to not use that function.

@mbabker
Done

Good idea but I am not a fan of the approach. Having a single icon next to the Toolbar title has no real meaning so people will not know what it does.

I think adding it below the textarea as show in the screenshot below would be better. The icon for the "toggle editor" button also really needs to change too:

An alert should also appear if the article requires saving before hand

That looks like you are previewing only description ?

but also i agree that an icon next to "Page title" is not best choice ?

• there should be a new button next to the buttions "save" , "close" etc

I agree about the icon - I will see what I can find (for another PR)

Brian Teeman
Co-founder Joomla! and OpenSourceMatters Inc.
http://brian.teeman.net/

I have tested this item ✅ successfully on b8805e7

I have tested this item ✅ successfully on b8805e7

RTC

Sorry I am removing the RTC at this time.

Indeed. Test were not done correctly. Once more, the language has to be included in the link... !!! See above.

Once #11060 is merged, the right code would be:

diff --git a/administrator/components/com_content/views/article/view.html.php b/administrator/components/com_content/views/article/view.html.php
index 9f58183..6bc8cce 100644
--- a/administrator/components/com_content/views/article/view.html.php
+++ b/administrator/components/com_content/views/article/view.html.php
@@ -87,6 +87,65 @@
        $canDo = $this->canDo;

+       $link        = "";
+       $linkArticle = "";
+
+       if (!$isNew)
+       {
+            $lang = '';
+            $sef  = '';
+
+            // Get the home Itemid for the language
+           $db = JFactory::getDbo();
+           $query = $db->getQuery(true);
+
+           $query->select('id')
+               ->from($db->qn('#__menu'))
+               ->where($db->qn('home') . '= 1')
+               ->where($db->qn('published') . '= 1')
+               ->where($db->qn('client_id') . '= 0');
+
+           if (JLanguageMultilang::isEnabled())
+           {
+               $query->where($db->qn('language') . ' = ' . $db->q($this->item->language));
+           }
+           else
+           {
+               $query->where($db->qn('language') . ' = ' . $db->q('*'));
+           }
+           $db->setQuery($query);
+
+           $Itemid = '&Itemid=' . (int) $db->loadResult();
+
+           if ($this->item->language && JLanguageMultilang::isEnabled())
+           {
+               // Get the sef prefix for the language
+               $query->clear()
+                   ->select('sef')
+                   ->from($db->qn('#__languages'))
+                   ->where($db->qn('published') . '= 1')
+                   ->where($db->qn('lang_code') . ' = ' . $db->q($this->item->language));
+               $db->setQuery($query);
+
+               $sef = $db->loadResult();
+
+               if ($this->item->language != '*')
+               {
+                   $lang = '&lang=' . $sef;
+               }
+               else
+               {
+                   $lang = "";
+               }
+           }
+
+           $link = JRoute::_('index.php?option=com_content&view=article&id=' . (int) $this->item->id
+                   . '&catid=' . (int) $this->item->catid . $lang . $Itemid , true, null, 'site');
+           $linkArticle = '<a href="' . $link . '" title="' . $this->item->title
+                   . '" target="_blank"><span class="icon-out-2"></span></a>';
+       }
+
        JToolbarHelper::title(
-           JText::_('COM_CONTENT_PAGE_' . ($checkedOut ? 'VIEW_ARTICLE' : ($isNew ? 'ADD_ARTICLE' : 'EDIT_ARTICLE'))),
+           JText::_('COM_CONTENT_PAGE_' . ($checkedOut ? 'VIEW_ARTICLE' : ($isNew ? 'ADD_ARTICLE' : 'EDIT_ARTICLE')))
+           . " " . $linkArticle,
            'pencil-2 article-add'
        );

@andrepereiradasilva
As you see in my code above, I did not need
JRoute::_(ContentHelperRoute::getArticleRoute

@andrepereiradasilva
As you see in my code above, I did not need
JRoute::_(ContentHelperRoute::getArticleRoute

true, but if already exists why not just reuse it like i did in my comment?

Indeed. :)

This would be enough:|

        $linkArticle = "";
        $url         = "";

        if (!$isNew)
        {
            JLoader::register('ContentHelperRoute', JPATH_SITE . '/components/com_content/helpers/route.php');
            $url = JRoute::_(ContentHelperRoute::getArticleRoute((int) $this->item->id, (int) $this->item->catid, $this->item->language), true, null, 'site');
            $linkArticle = '<a href="' . $url . '" title="' . htmlspecialchars($this->item->title, ENT_COMPAT, 'UTF-8') . '" target="_blank"><span class="icon-out-2"></span></a>';
        }

        JToolbarHelper::title(
            JText::_('COM_CONTENT_PAGE_' . ($checkedOut ? 'VIEW_ARTICLE' : ($isNew ? 'ADD_ARTICLE' : 'EDIT_ARTICLE')))
            . " " . $linkArticle,
            'pencil-2 article-add'
        );

I have tested this item ✅ successfully on b8805e7

@pe7er will you be updating this to work with multilingual as mentioned by @infograf768 above?

Actually, I prefer @C-Lodder his approach, with adding a button below the article.
Could you please create a PR for your suggestion?

I can do tonight. Would it not be best to submit a PR against the 3.7 branch so that #11060 will be merged too?

@c-lodder any update?

@brianteeman - will do now. So I assume this is going into staging then?

PR: #12367

@pe7er not sure what the status is on this PR - can you clarify please

I have tested this item 🔴 unsuccessfully on b8805e7

How comes this was never implemented? Seems like a no-brainer.

@AndySDH - It's already in J4.x (display in a modal) so people are more than welcome to copy it into 3.x

@C-Lodder haven't seen the new "Preview"-Button before.

@franz-wohlkoenig https://gyazo.com/3f79759488413cc5acd3d6f0daf479ad

@C-Lodder i meant: Havent seen before your comment;-)

@pe7er I am going to close this issue as it is already implemented in Joomla 4 and Joomla 4 is on the horizon. This may not be worth the effort.

Ok, thanks @roland-d

@roland-d @pe7er Hello from 2020! Almost 3 years have passed, and we still do not see this function, just as we do not even see the beta version of Joomla 4.

How many articles could be created using this feature over the last 3 years...