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United-Forum Nivo Slider Widget · **Released**: 07-17-2011

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

Quote:

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:

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:
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 = 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:
Code:
.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

wombycat · #**292** 10-16-2011, 07:12 AM

This is a great mod!

Is there a way to control which attachment is displayed? I have an image I want the slider to use for each article as I write them, though I don't want to display the slider image in the article itself. What i have been doing is adding the attachment to the article though not displaying it in the article which works fine. The problem is that when I add an image I do want displayed in the article but not in the slider it takes precedence over the old slider image and is displayed in the slider.

Is it possible for the slider to pull say an image with a particular name? So that the slider always looks for a imaged named 'slider.png' and pulls that for the slider as opposed to the first image in the article?

bintoro · #**293** 10-16-2011, 12:50 PM

Please excuse my noob question.

I install the slider and it's work in the header of frontpage CMS.

The small display of information about the article is display in the bottom area. However, the picture is not showing at all. All the 5 article in spider is showing "uf_fallback_slider.png"

Does it means that my article is not having any picture. I normally include picture by using url reference only.

After that, I upload picture to my article. However, this picture is still not show in the slider too.
My site: http://www.komunitasparfum.com

Any advise to repair it ???? Thanks in advance.

Mooff · #**294** 10-19-2011, 12:50 PM

@bintoro
please go through the faq in the second post.
Your site isn't loading for me - i'm getting a 500 internal server error when trying.

@wombycat
Then you do not need the resizing part. Just manually upload the slider-images you want to show in your slider-img-filepath-folder and change the following code (untested):

Code:

                //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.
                            $article['previewimage'] = $fallback_img;
                            echo '<span style="color:red">Error occurred:</span> imagecreation failed. ' . $article['previewimage']. '<br />';
                        }
                        else
                        {
                            $img_width = $imageinfo[0];
                            $img_height = $imageinfo[1];
                            
                            imagecopyresampled($sprite, $image, 0, 0, 0, 0, $maxwidth, $maxheight, $img_width, $img_height );
                            imagedestroy($image);

                            $img_filepath = $slider_img_filepath . 'slide_' . $i . '.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.
                        $article['previewimage'] = $fallback_img;
                        echo '<span style="color:red">Error occurred:</span> picture is not readable.' . $article['previewimage']. '<br /> ';
                    }                  
                }
                else
                {
                    //resiziing did not work - we are using the fallback image.
                    $article['previewimage'] = $fallback_img;
                    echo '<span style="color:red">Warning:</span> article has no previewimage or sprite is no ressource. ' . $article['previewimage']. '<br />';
                }

to

Code:

$filename = $slider_img_filepath . 'slide_' . $article['nodeid'] . '.jpg';
if (file_exists($filename))
{$article['previewimage'] = $filename;}
else
{$article['previewimage'] = $fallback_img;}

What it does:
It does look for a file named slide_342.jpg in your slider folder. Where 342 is your articleID. If that file does exist it is used as the sliderimage. If not the fallback image is used.

If you want to use a different folder manipulate the $filename variable to your needs.

Cheers Mooff

bintoro · #**295** 10-19-2011, 01:37 PM

@Mooff
Thanks for your info. Frankly, I don't understand with 500 internal server error ???
I just check my website and loading is fine.
Mind to recheck once again please....... Thanks.

Zervesa · #**296** 10-23-2011, 03:23 PM

Hi,

I installed the Nivo Slider Widget on my Site.

I write some Articels with Images but the Slider dont show this images.

The Slider shows the articel Title, and the backup Picture, but not the pictures from my articles.

zapiy · #**297** 10-24-2011, 10:10 AM

Can this mod be used to pull images from a folder as apposed from articles and so on?

Valker · #**298** 10-26-2011, 10:53 AM

Hi ! I hope someone can help me ;S

I installed the Slider as said on my page:

http://www.trinitas-gilde.com/content.php

but the article-images do not show up -_-
i checked about the query etc, but its exaclty as Zervesa descibed.

I?ll hope for help xD

Mooff · #**299** 10-26-2011, 01:06 PM

@bintoro
It's loading, but really slow, like 15sec before anything happens for me.

@Zervesa, Valker
please go through the faq in post 2.

@zapiy
it can be used for such a behaviour, but that does need recoding. If you come up with some php-code which cycles through a folder and pulls images i can tell you where to put that.

Valker · #**300** 10-27-2011, 07:23 PM

works fine now thanks

i failed with the link cause we have a temprary domain (we?ll have an other in a few weeks)

Valker · #**301** 10-28-2011, 10:16 AM

Hi again :P

So i got a question about the "read on".
I want to change it, and seached for this phrase in the data, but found nothing.
I even tried to find the answer by the nivo slider, but there was no explenation.

Do you have a clue bout it ?

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