Correct Facebook share thumbnail and description - Joomla 2.5 & Virtuemart 2.0

This is a great way to add Open Graph meta tags to the flypage of Virtuemart, to specify the image used by Facebook like, share, send, etc buttons 
I have made some little improvements to your code though, so that it will not be necessary to hard code the domain name of your site and also i added the og::site_name meta tag.
Also I wanted the generated html code to be valid (http://validator.w3.org/) so i had to use addCustomTag() instead of setMetaData() to generate "meta property" instead of "meta name" .

Code: 

$og_type = 'article';
$og_url = JURI::current();
$og_image =  JRoute::_(JURI::base().$this->product->images[0]->file_url);
$og_desc = $this->product->product_s_desc;
$og_title = $this->product->product_name;

$app =& JFactory::getApplication();
$og_sitename = $app->getCfg('sitename');

$doc = JFactory::getDocument();
$doc->addCustomTag('<meta property="og:type" content="article"/>');
$doc->addCustomTag('<meta property="og:url" content="'.$og_url.'"/>');
$doc->addCustomTag('<meta property="og:site_name" content="'.$og_sitename.'"/>');
$doc->addCustomTag('<meta property="og:image" content="'.$og_image.'"/>');
$doc->addCustomTag('<meta property="og:description" content="'.$og_desc.'"/>');
$doc->addCustomTag('<meta property="og:title" content="'.$og_title.'"/>');

This piece of code has to be inserted at the first lines of file "components/com_virtuemart/views/productdetails/tmpl/default.php" just after the line:

Code: 

defined('_JEXEC') or die('Restricted access');
It would be even better if you copy this file at your template directory (folder: templates/my_Joomla_template/html/com_virtuemart/productdetails/) so that it will not be modified by any Virtuemart upgrades.


Check this Change by link:
https://developers.facebook.com/tools/debug

Product sort order on browse/category view - ascending to descending

Problem:
When i show virtuemart home page the product will show in ASC order , (the oldest first) how can i change this with the newest first ?
In the configuration i use date_created_on , if i press this option (in selectbox) is correct but i would that was by default

Solution:
change file: /administrator/components/com_virtuemart/models/product.php
Find the following code:

Code: [Select]

/* invert order value set*/
if ($order =='ASC') {
$orderlink ='&order=DESC';
$orderTxt = JText::_('COM_VIRTUEMART_SEARCH_ORDER_DESC');
} else {
$orderTxt = JText::_('COM_VIRTUEMART_SEARCH_ORDER_ASC');
$orderlink ='';
}
and just switch the order. Be AWARE that this will change all your default sort by to descend.

ALSO, Do you have SEF on or off?

if SEF on, then go to /components/com_virtuemart/router.php.
Inside the file, move the following:

Code: [Select]

if ( isset($query['order']) ) {
if ($query['order'] =='DESC') $segments[] = $helper->lang('orderDesc') ;
unset($query['order']);
}to after 

Code: [Select]

if ( isset($query['orderby']) ) {
$segments[] = $helper->lang('by').','.$helper->lang( $query['orderby']) ;
unset($query['orderby']);
}

Apply Watermark image into Product Image of Virtuemart

Problem: When Creating an shopping website, we would like to apply a watermark image - logo and website name - on every picture of products. It is seem easy by this way: use an watermark program to apply icon on product picture, then upload that picture on hosting. Take a long time if you have over 50 products.
I want to do this work automatically, It means watermark picture will be applied in to all picture (old and new) of website

Solve: I do this work on Joomla 2.5 and Virtuemart 2.0. But I think it is comfortable for every happen load and show Image.

• Step 1: Create file .htaccess on folder contain image, with Virtuemart 2.0, this folder is <your_domain>/images/stories/virtuemart/product.
  
  RewriteRule ^(resized)($|/) - [L]
  RewriteEngine On
  RewriteCond %{REQUEST_FILENAME} -f
  RewriteRule \.(gif|jpeg|jpg|png)$ watermark.php [QSA,NC]
• Step 2: Create file watermark.php at same folder of .htaccess with content:
  
  
  <?php
  // watermark.php
  // Path the the requested file
  $path = $_SERVER['DOCUMENT_ROOT'].$_SERVER['REQUEST_URI'];
  // Load the requested image
  $image = imagecreatefromstring(file_get_contents($path));$w = imagesx($image);$h = imagesy($image);
  // Load the watermark image
  $watermark = imagecreatefrompng('watermark.png');$ww = imagesx($watermark);$wh = imagesy($watermark);
  // Merge watermark upon the original image (centred)
  imagecopy($image, $watermark, (($w/2)-($ww/2)), (($h/2)-($wh/2)), 0, 0, $ww, $wh);
  // Send the image
  header('Content-type: image/jpeg');imagejpeg($image,null,95);
  exit();?>
• Step 3: Create an watermark.png with transparent background and upload to that folder.

Done.

Now you can test all image file in folder <your_domain>/images/stories/virtuemart/product have watermark if you call them on your website

Note: the code line RewriteRule ^(resized)($|/) - [L] in .htaccess file ensure that all thumbnail file in resized folder will be not watermarked. If you want to watermark on both thumbnail and large picture, you can remove that line

Demo