Image submit buttons on Drupal 5.10

I follow this useful howto by Tom Constant on how to add image submit buttons on Drupal forms. Since I got a JavaScript error on drupal.js (line 31: button is undefined), I rewrite Tom’s implementation, and now it works fine on Drupal 5.10:

function phptemplate_button($element) {
  // Make sure not to overwrite classes.
  if (isset($element['#attributes']['class'])) {
    $element['#attributes']['class'] = 'form-'. $element['#button_type'] .' '.
 $element['#attributes']['class'];
  }
  else {
    $element['#attributes']['class'] = 'form-'. $element['#button_type'];
  }

  // here the novelty begins: check if #button_type is normal submit
  // button or image button
  switch($element['#button_type']) {
	case 'image': $button_type = 'image';
	break;
	default: $button_type = 'submit';
	break;
  }
  return '<input id="'. $element['#id'].'" name="'. $element['#name'] .'"
 type="' . $button_type . '" value="'. check_plain($element['#value']) .'" />

PDF cover thumbnails for attached files

This howto has been superseded by http://drupal.org/node/815816 (patch for Upload preview module).
Tested on:

• Drupal 5.x
• Content Templates module
• ImageMagick 6.3.7
• GhostScript 8.15.3

Using ImageMagick + GhostScript you can convert the first page of a PDF into a thumbnail image linking to file. You can cut and paste this function on your theme main script: you have to manually create the thumb directory and grant write permission by scripts. Check also the path to ImageMagick convert command.

function pdf_thumb_attachments(){
 $allowed_mime = array("application/pdf");
	foreach($files as $file){
	if(in_array(strtolower($file->filemime),$allowed_mime) && strstr(strtolower($file->description),"classifica")){
		$title = $file->description;
		if(substr($title,-4)==".pdf"){
			# create link title from file name (Transliteration module suggested)
			$title = str_replace("_"," ",substr($title,0,strlen($title)-4));
		}
		$img = "";
		$local_src_path = getcwd() . "/" . $file->filepath;
		$destfilename = substr($file->filename,0,strlen($file->filename)-4) . ".gif";
		# YOUR-FILES-DIRECTORY/pdfgen will hosts the generated thumbnails
		$local_dest_path = getcwd() . "/" . file_directory_path() . "/pdfgen/" . $destfilename;
		$imageurl = base_path() . file_directory_path() . "/pdfgen/" . $destfilename;
		/* create thumbnail on node reading if file doesn't exist */
		if(!file_exists($local_dest_path)){
			# choose the first page of the PDF, scale to 90x90px and convert to GIF
			$exec = '/usr/bin/convert -scale 90x90 "'.$local_src_path.'"[0] "'.$local_dest_path . '"';
			shell_exec($exec);
			/* delete this line if you cannot read the generated file
			$exec = "chmod 777 ".$local_src_path;
			shell_exec($exec);
			//*/
		}
		$img = '<img src="'.$imageurl.'" alt="'.$title.'" />';
		$output .= "<li>". l($img." ".$title,$file->filepath, $attributes = array("title"=>$title), $query = NULL, $fragment = NULL, $absolute = TRUE, $html = TRUE) . "</li>";
	}
	}
 if(!empty($output)){
	$output = '<div class="my-attachments"><ul>' . $output . "</ul></div>";
 }
 return $output;
}

Update

You can alternatively use imagemagick function provided by image.module (the image.imagemagick.inc file on drupal/includes):

function file_preview_path($filename, $filepath = 'filepreview') {
  /** generate jpg thumbnails **/
  return $filepath . "/" . substr($filename,0,strlen($filename)-4) . ".jpg";
}

 function file_preview(&$file, $pages = Array(1)) {
   $allowed_mime = array("application/pdf");
   if(in_array(strtolower($file->filemime),$allowed_mime)){
	$local_src_path = getcwd() . "/" . $file->filepath;
	$local_dest_path = getcwd() . "/" . file_directory_path() . "/" . file_preview_path($file->filename);
	# create thumbnail only when needed
	$imagemagick = getcwd() . '/includes/' . 'image.imagemagick.inc';
	if(!file_exists($local_dest_path) && file_exists($imagemagick)){
		include_once($imagemagick);
               _image_imagemagick_convert($local_src_path.'[0]',
                                                       $local_dest_path, array('-colorspace RGB'));
		# all can read thumbnail files
		if(file_exists($local_dest_path))
			chmod($local_dest_path, 0777);
	}
	return file_preview_path($file->filename);
    }
    else{
	return FALSE;
    }
 }

Image rollover on primary links Drupal howto

Tested on:

• Drupal 5.x
• Zen theme
• Requirements: JQuery Update

Do you remember my Customize links menu in Drupal mini-howto? You can use it to change text links in image links renaming and customizing theme_links function (from theme.inc) and adding it to your template.php.

On your template.php file, you have something like this:
$imglink_path = path_to_theme() . “/my_zen_subtheme/menu/” . str_replace(” “,”_”,strtolower($link['title']) . $imgsuffix . “.gif”);
$imglink = theme_image($imglink_path, $alt = $link['title'], $title = $link['title'], $attributes = NULL, $getsize = FALSE);
if(empty($imglink))
$imglink = $link['title'];

1. Search for images in a defined folder by link title: if link title is “My Nice Link”, a “my_nice_link.gif” image is used.
2. Generate HTML code for “my_nice_link.gif”. Note: getsize is set to FALSE to avoid errors on rollover
3. If Drupal cannot generate HTML code for image (e.g. file not found) link is rendered as plain text

If you want to add a rollover effect on primary links images, you have to add this JQuery javascript code on page.tpl.php:

<script type="text/javascript">// <![CDATA[
$(document).ready(function()
{
$("#primary a").mouseover(function ()
{
$rollsrc = $(this).children("img").attr("src");
$matches = $rollsrc.match(/_active.gif$/);
if (!$matches) {
$rollON = $rollsrc.replace(/.gif$/,"_active.gif");
$(this).children("img").attr("src", $rollON);
}
});

$("#primary a").mouseout(function ()
{
$(this).children("img").attr("src", $rollsrc);
});
});
// ]]></script>

Where "_active" is the rollover image.

See also:

• Easy, Reusable Image Rollovers with jQuery (JQuery rollover tips used for this mini-howto)

Update:

• A module for Drupal 6.x named Signwriter allows to generate text from images even for menus.