vBulletin CMS Widgets - United-Forum Nivo Slider Widget

Based on the Nivo Slider - all credit for slider awesomeness goes to them.
vB4 implementation goes to me.


What it is:
A slider for cms articles, it gets the articles via database, uses (if possible) the previewimage there and resizes it to slider size *update 1.1.0 cropping function included.

Livedemo on a Big Board (>2.000.000 posts)
the nivo slider on our site is customized to fit our heavily customized cms. Default look of this addon is shown in the picture below


facts about the nivo slider

Originally Posted by nivo slider homepage

- ~ 600.000 downloads
- 16 transition effects
- a ton of options
- different available themes
- ...

Installation

• upload all files (attached zip file) in the folder where you do need them - this has to be the same folder you will set via $slider_img_filepath (see picture)
  
  
  
• create a new php-widget and insert the following code:
  

  // DEBUG MODUS !
  $debug_modus = false;
  
  if($debug_modus === false)
  {
  	ob_start();
  }
  
  //nivo slider - uf - vb.org version
  //set these values as you need them:
  
  //your slider folder - has to be read and writeable
  //folder where all slider files are saved
  $slider_img_filepath = 'external/unitedforum/slider/';   
  
  //picture width and height !same as in the CSS FILE!
  $maxwidth = 650;                                  
  $maxheight = 250;    
  
  //do you want images without previewimage to be shown? slider is using the fallback then
  $show_articles_without_image = false;           
  
  //picture shown if your articles has no previewpicture
  $fallback_img = $slider_img_filepath . 'uf_fallback_slider.png';  
  
  //hardcoded maximum is 20 - if you want more just ask
  $number_of_articles_shown = 10;                                
              
  //lengh in characters of the article descriptions
  $description_length = 95;
  
  //stretch picture or crop them? false = strechting (default) true = cropping (beta)
  $crop = false;
  
  
  //Debug Messages
  if($debug_modus)
  {
  	echo "<span style='color:red;'>DEBUG MODE is ON! </span><br />";
  	echo "slider_img_filepath: $slider_img_filepath <br />";
  	echo "width: $maxwidth   height: $maxheight <br />";
  	echo "Strech or Crop? $crop <br />";
  	echo "show_articles_without_image: "; 
          var_dump($show_articles_without_image); 
          echo " <br />";
  	echo "fallback_img: $fallback_img <br />";
  	echo "#img: $number_of_articles_shown <br />";
  	echo "description_length: $description_length <br />";
  	echo 'directory ' . DIR . '<br />';
  
  }
  
  
  
  
  $article_type = vb_Types::instance()->getContentTypeID("vBCms_Article");
  $time = TIMENOW;
   
  if(!extension_loaded('gd'))
  {
  	echo '<span style="color:red">Error occurred:</span> Your System does not support the GD-Libary. Please install the GD-Libary.<br />';
  }
         
  	$article_get = vB::$db->query_read('
          SELECT
              article.pagetext,
              article.previewimage,
              node.url,
              node.publishdate,
              node.parentnode,
              parentnode.url AS parenturl,
              thread.replycount,
              info.title,
              node.nodeid,            
              GROUP_CONCAT( category.category )
          FROM
              '.TABLE_PREFIX.'cms_article AS article INNER JOIN
              '.TABLE_PREFIX.'cms_node AS node 
                  ON (node.contentid = article.contentid AND node.contenttypeid = ' . vb::$db->sql_prepare($article_type) .') INNER JOIN
              '.TABLE_PREFIX.'cms_nodeinfo AS info 
                  ON info.nodeid = node.nodeid INNER JOIN
              '.TABLE_PREFIX.'cms_node AS parentnode 
                  ON parentnode.nodeid = node.parentnode LEFT JOIN
              '.TABLE_PREFIX.'thread AS thread ON thread.threadid = info.associatedthreadid LEFT JOIN
              '.TABLE_PREFIX.'cms_nodecategory AS nodecategory ON nodecategory.nodeid = node.nodeid LEFT JOIN
              '.TABLE_PREFIX.'cms_category AS category ON nodecategory.categoryid = category.categoryid 
          WHERE
              node.setpublish = 1 AND
              node.publishdate > '. vb::$db->sql_prepare($time) .' -34560000 AND
  			node.publishdate < '. vb::$db->sql_prepare($time) .' 
          GROUP BY node.nodeid
          ORDER BY node.publishdate
          DESC LIMIT 20');
  
      $database_articles = array();
      
      /* my version of sorting the articles via relevance - i'll keep it in case someone is interested*/
      while($article = vB::$db->fetch_array($article_get))
      {
          $article['value'] = ( 5 - ($time - $article['publishdate'] ) / 86400 ) * ( 5 - ($time - $article['publishdate'] ) / 86400 ) * ( 5 - ($time - $article['publishdate'] ) / 86400 ) + (10 * $article['replycount']);
          $database_articles[] = $article;        
      }
      
      foreach($database_articles as $c => $key)
      {
          $sort_value[] = $key['value'];
      }
      
      array_multisort($sort_value, SORT_DESC, $database_articles);    
      
      //
      $i = 0;
      $section_array = array();
      $featured_articles = array();
  	
      foreach($database_articles AS $article)
      {
          $section_array[$article['parentnode']]++;
  
          $categories = explode(',' , $article['GROUP_CONCAT( category.category )']);
       
          if($show_articles_without_image == true OR $article['previewimage'])
          {
              if($section_array[$article['parentnode']] < 50 AND $i < $number_of_articles_shown)
              {
  				if($debug_modus == true OR !file_exists($slider_img_filepath . 'slide_' . $article['nodeid'] . '.jpg'))
  				{
  					//rebuild image to the height and width we want in the slider 
  					//called sprite since i got the code from our sprite addon :P
  					$sprite = imagecreatetruecolor($maxwidth, $maxheight);
  					if(is_resource($sprite) AND $article['previewimage'] )
  					{                   				
  						$imageinfo = getimagesize($article['previewimage']);
  						if(is_array($imageinfo))
  						{   
  							$image = null;
  							switch($imageinfo[2])
  							{
  								case IMAGETYPE_PNG:
  								$image = imagecreatefrompng($article['previewimage']);
  								break;
  								case IMAGETYPE_GIF:
  								$image = imagecreatefromgif($article['previewimage']);
  								break;
  								case IMAGETYPE_JPEG:
  								$image = imagecreatefromjpeg($article['previewimage']);
  								break;
  								default:
  								echo '<span style="color:red">Error occurred:</span> Unknown image format. ' . $article['previewimage']. '<br />';
  								break;                        
  							}
  							
  							if(!is_resource($image))
  							{
  								//resiziing did not work - we are using the fallback image.
  								echo '<span style="color:red">Error occurred:</span> imagecreation failed. ' . $article['previewimage']. '<br />';
  								$article['previewimage'] = $fallback_img;
  							}
  							else
  							{
  								$img_width = $imageinfo[0];
  								$img_height = $imageinfo[1];							
  								
  								if($crop == false)
  								{									
  									imagecopyresampled($sprite, $image, 0, 0, 0, 0, $maxwidth, $maxheight, $img_width, $img_height );
  									imagedestroy($image);
  								}
  								else
  								{
  									//cropping
  									$ratiox = $maxheight / $img_height ;
  									$ratioy = $maxwidth / $img_width ;
  									$new_height = $img_height;
  									$new_width = $img_width;
  									
  									if ($maxheight > $img_height OR $maxwidth > $img_width)
  									{
  										if($ratiox > $ratioy)
  										{
  											$new_height = round($img_height * $ratiox);
  											$new_width = round($img_width * $ratiox);
  										}
  										else
  										{
  											$new_height = round($img_height * $ratioy);
  											$new_width = round($img_width * $ratioy);
  										}										
  									}
  									$cropx = $new_height - $maxheight;
  									$cropy = $new_width - $maxwidth;
  									
  									imagecopyresampled($sprite, $image, 0, 0, 0, 0, $new_width, $new_height, $img_width, $img_height);
  									imagedestroy($image);
  									
  								}
  								
  								
  								$img_filepath = $slider_img_filepath . 'slide_' . $article['nodeid'] . '.jpg';
  								$success = imagejpeg($sprite, DIR  . ($img_filepath[0] != DIRECTORY_SEPARATOR ?  DIRECTORY_SEPARATOR : '') . $img_filepath);
  								imagedestroy($sprite);
  								if($success)
  								{
  									$article['previewimage'] = $img_filepath;
  								}
  								else
  								{
  									$img_filepath = DIR  . ($img_filepath[0] != DIRECTORY_SEPARATOR ?  DIRECTORY_SEPARATOR : '') . $img_filepath;
  									echo '<span style="color:red">Error occurred:</span> imagejpeg failed. ' . $article['previewimage']. '<br />
  									directory: '. $img_filepath ;
  									
  									$article['previewimage'] = $fallback_img;
  								}
  							}
  							
  						}
  						else
  						{
  							//resiziing did not work - we are using the fallback image.
  							echo '<span style="color:red">Error occurred:</span> picture is not readable.' . $article['previewimage']. '<br /> ';
  							$article['previewimage'] = $fallback_img;
  						}                  
  					}
  					else
  					{
  						//resiziing did not work - we are using the fallback image.
  						echo '<span style="color:red">Warning:</span> article has no previewimage or sprite is no ressource. ' . $article['previewimage']. '<br />';
  						$article['previewimage'] = $fallback_img;
  					}
  				}
  				else
  				{
  					//we already have the image, no need to resize or crop anything
  					$article['previewimage'] = $slider_img_filepath . 'slide_' . $article['nodeid'] . '.jpg';
  				}
  
                  /*remove everything from the previewtext - html and bb. I do not want bold or colored text there. Cut to a decent length.*/        
                  $article['pagetext'] = strip_bbcode($article['pagetext'], true, true, false, true, false);
  
                  $article['previewtext'] = strip_tags($article['pagetext'], '<a>');
                      
                  $len = $description_length;
                  if ( strlen($article['previewtext']) > $len )
                  {                    
                      $article['previewtext'] = substr( $article['previewtext'] , 0 , strrpos( substr( $article['previewtext'], 0, $len), ' ' ));
                  }   
  
                  $i++;
                  //Build Array
                  $article_neu = array();
                  $article_neu['description'] = '<h2 style="font-weight:bold; font-size: 14px">'. $article['title'].'</h2><span>'. $article['previewtext'] .'</span> <a href="/content.php?r=' . $article['nodeid'] . '-' . $article['url'] . '">read on</a>';
                  $article_neu['htmlcaptionname'] = 'htmlcaption' . $article['nodeid'] ;
                  $article_neu['picture'] = '<a href="/content.php?r=' . $article['nodeid'] . '-' . $article['url'] . '"><img src="'.$article['previewimage'].'" alt="" title="#htmlcaption'. $article['nodeid'] . '" /></a>';
                  
                  $featured_articles[] = $article_neu;
              }
          }
      }
      
      //Randomize Array
      //shuffle($featured_articles);
  
  	//Debug Messages
  	if($debug_modus)
  	{
  		echo '#articles - featured and databasepull ';
  		var_dump(count($featured_articles));
  		var_dump(count($database_articles));
  	}
  
      
  $output_bits = '
      <link rel="stylesheet" href="' .$slider_img_filepath. 'nivo-slider.css" type="text/css" media="screen" />
      <link rel="stylesheet" href="' .$slider_img_filepath. 'nivo-slider_uf_theme.css" type="text/css" media="screen" />
      <div style="height:' . $maxheight . 'px;">
      <div id="wrapper">
          <div class="slider-wrapper theme-uf">
              <div class="ribbon"></div>
              <div id="slider" class="nivoSlider">';
              
                  foreach($featured_articles AS $article)
                  {
                      $output_bits .= $article['picture'];
                  }
              $output_bits .= '
              </div>';
              
              foreach($featured_articles AS $article)
              {
                  $output_bits .= '<div id="' . $article['htmlcaptionname'] . '" class="nivo-html-caption">' . $article['description'] .'</div>';
              }
              
              $output_bits .= '         
          </div>
  
      </div>
      <script type="text/javascript" src="' .$slider_img_filepath. 'jquery-1.6.1.min.js"></script>
      <script type="text/javascript" src="' .$slider_img_filepath. 'jquery.nivo.slider.pack.js"></script>
      <script type="text/javascript">
      $(window).load(function() {
          $("#slider").nivoSlider();
      });
      </script>
      </div>
      ';
          $output = $output_bits;
   
  if($debug_modus === false)
  {
  	ob_end_clean();        
  }

• set refresh time to something big!
• save - add the widget to your layout - enjoy

Custom settings:

At the top of the php-widget code you can see the following:

// DEBUG MODUS !
$debug_modus = false;

if($debug_modus === false)
{
	ob_start();
}

//nivo slider - uf - vb.org version
//set these values as you need them:

//your slider folder - has to be read and writeable
//folder where all slider files are saved
$slider_img_filepath = 'external/unitedforum/slider/';   

//picture width and height !same as in the CSS FILE!
$maxwidth = 650;                                  
$maxheight = 250;    

//do you want images without previewimage to be shown? slider is using the fallback then
$show_articles_without_image = false;           

//picture shown if your articles has no previewpicture
$fallback_img = $slider_img_filepath . 'uf_fallback_slider.png';  

//hardcoded maximum is 20 - if you want more just ask
$number_of_articles_shown = 5;                                
            
//lengh in characters of the article descriptions
$description_length = 95;

If you change $maxwidth and $maxheight you need to edit the nivo-slider_uf_theme.css file, here:

.theme-uf #slider {
    margin:0px auto 0 auto;
    width:650px; /* Make sure your images are the same size */
    height:250px; /* Make sure your images are the same size */
}

Width and height have to be the same value in your php-widget and in the css file.

In additon to these settings i also included a "value/relevance function". Meaning the slider doesn't show your latest 5 articles, but instead weights them based on age and comments.

As older an article is the less likely it will show up in the slider.
More comments make it more likely.

This behaviour can be easily changed. I didn't include an if condition cause every board has different needs and i don't know whats best for you.
In addition conditions like "articles just from this section - or these sections, or this category, with a minimum of 10 posts" can be included via one single if condition. Again, i don't know what your board needs or what your category names are.

You can also modify the preview length (more words, less words), the preview style (color fontsize, fontweight .... Again different forums different needs. It's highly customizable.

Support:

Support and requests for the slider itself should be asked here http://nivo.dev7studios.com/
Same goes for different slider themes - a lot is possible, even thumbnails - again this is part of the nivo slider and not the vb4 implementation.

If you have any questions regarding the settings - or want different settings (which have to do with vb4) - ask, and i'll try to come up with some code // show you where you have to put what.

Slider not working. No idea why?

You will find a FAQ in the first comment, which will be kept up to date:
FAQ

The widget here is completely free. No charge, no branding.
But, we do not mind donations either. If you want to give us something. Since we are advertising free and fan based we are happy about every small donation.
( On Forumhome bottom right paypal button: http://www.united-forum.de/forum.php )



That's all
Hope it works for you.
Regards Mooff

[Mooff]

0.9.1 (21.07.2011)

• added $description_length variable
• reworked description cutting code. Now using a word sensitive substring function. Cutpoint is easier on the eye now.
• removed some slashes '/' in the code which might have caused pictures not beeing shown
• changed description title to h2 instead of span - might have a small effect on beeing more seo friendly
• removed a bug in the image resizing code (code was wrongly placed outside an else condition)

@Morpheus NS
Your issue could be the slashes. Meaning the path ending up at /http/slider//picture.jpg which could break it. Please try 0.9.1.

If that isn't the problem check whether the pictures are saved in the folder you chose and if you can look them up manually in your browser.

[Alfa1]

The new version work much better for me. No more errors and I now see titles and text. No images yet though. If I outcomment the 1st and last line, then I get these errors:

Warning: fopen() [function.fopen]: URL file-access is disabled in the server configuration in [path]/packages/vbcms/widget/execphp.php(191) : eval()'d code on line 110

Warning: fopen(http://www.mysite.org/attachment.php?attachmentid=79&cid=18) [function.fopen]: failed to open stream: no suitable wrapper could be found in [path]/packages/vbcms/widget/execphp.php(191) : eval()'d code on line 110

Warning: fopen() [function.fopen]: URL file-access is disabled in the server configuration in [path]/packages/vbcms/widget/execphp.php(191) : eval()'d code on line 110

Warning: fopen(http://www.mysite.org/attachment.php?attachmentid=90&cid=18) [function.fopen]: failed to open stream: no suitable wrapper could be found in [path]/packages/vbcms/widget/execphp.php(191) : eval()'d code on line 110

Warning: fopen() [function.fopen]: URL file-access is disabled in the server configuration in [path]/packages/vbcms/widget/execphp.php(191) : eval()'d code on line 110

Warning: fopen(http://www.mysite.org/attachment.php?attachmentid=93&cid=18) [function.fopen]: failed to open stream: no suitable wrapper could be found in [path]/packages/vbcms/widget/execphp.php(191) : eval()'d code on line 110

Warning: fopen() [function.fopen]: URL file-access is disabled in the server configuration in [path]/packages/vbcms/widget/execphp.php(191) : eval()'d code on line 110

Warning: fopen(http://www.mysite.org/attachment.php?attachmentid=92&cid=18) [function.fopen]: failed to open stream: no suitable wrapper could be found in [path]/packages/vbcms/widget/execphp.php(191) : eval()'d code on line 110

[Mooff]

We are using the fopen() function to check whether the file does still exist on the external server before we start our image manipulation.

Seems like url file access is blocked on your server. I don't know whether this is done via your provider or if you can switch it on in your php.ini
http://www.php.net/manual/en/filesys...figuration.php

That would be your first option.

Second option ist to replace this code:

                    $filehandle = fopen($article['previewimage'], 'r');
                    if(is_resource($filehandle))
                    {
                        fclose($filehandle);

with the curl based file check (your server needs to have cUrl for that.

                    $can_open_file = false;                    
                    if(strpos($article['previewimage'], 'http://') === false)
                    {
                        $can_open_file = is_readable($article['previewimage']);
                    }
                    else
                    {
                         // initialize a new curl resource
                         $ch = curl_init();

                         // set the url to fetch
                        curl_setopt($ch, CURLOPT_URL, $article['previewimage']);

                        //exclude the header
                        curl_setopt($ch, CURLOPT_HEADER, FALSE);
                        
                        //exclude the body
                        curl_setopt($ch, CURLOPT_NOBODY, TRUE);
                        
                        // return the value instead of printing the response to browser
                        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);


                        //take the content as a instance
                        //$filehandle = curl_exec($ch);
                        if(!curl_errno($ch))
                        {
                            $can_open_file = true;
                        }
                                              
                        curl_close($ch); 
                    }
                    if($can_open_file)
                    {

If that doesn't work you can try to ignore the file_check and see if the GD url access isn't blocked (like fopen() is).
So the third option would be:
Replace

                    $filehandle = fopen($article['previewimage'], 'r');
                    if(is_resource($filehandle))
                    {
                        fclose($filehandle);

with

                    if(true)
                    {

If that doesn't work i'm out of options.



P.S.: On my testsite i have the curl option running right now.

[Alfa1]

Yes, fopen is blocked on purpose due to the major security risks involved. Curl is active though, so that should work. But for some reason it doesn't. Would you mind checking it out?

[Mooff]

Please check if the folder you specified here:
$slider_img_filepath = 'external/unitedforum/slider/';
is writeable and whether the addon does save slides in there.

[Alfa1]

Its 777 writable, but the addon does not save anything.

[Mooff]

Oh geez i'm so stupid. It doesn't work with attachments right now - i'll fix that bug and post a new version later today.

[Alfa1]

Thanks!

[Mooff]

0.9.2 (23.07.2011)

• fixed a bug which caused the slider to not find attachements
• removed the fopen() function. Now checking via a GD function whether given ressource is an image

There you go - code in first post updated.
That should do the trick. =)

[SECTalk.com]

Add-on works insofar as it resizes the images and writes them into the folder. It also displays the little background image. But it won't display anything else.

Any ideas?

When I comment out the first and last lines, same thing. No errors.

Thanks