Tips & Tricks
Pulling custom fields from outside the loop
In the last post “Creating a custom widget” I showed you how to create a custom widget. Well in this post I will show you how I used my custom widget to display all post with a certain custom field from outside the WordPress loop.
In the last post I used this tag:
<?php include(TEMPLATEPATH . '/includes/showcase.php'); ?>
Now I will show you what the file showcase.php has:
<ul> <?php global $wpdb; $sql = "SELECT wposts.* FROM $wpdb->posts wposts, $wpdb->postmeta wpostmeta WHERE wposts.ID = wpostmeta.post_id AND wpostmeta.meta_key = 'gallery-url' AND wposts.post_status = 'publish' AND wposts.post_type = 'post' ORDER BY wposts.post_date DESC LIMIT 8"; $pageposts = $wpdb->get_results($sql, OBJECT); $output = $pre_HTML; foreach ($pageposts as $post) : setup_postdata($post); ?> <li><a href="<?php echo get_post_meta($post->ID, "gallery-url", $single = true); ?>" title="Link to <?php the_title(); ?>"> <img src="<?php echo get_post_meta($post->ID, "image", $single = true); ?>" alt="<?php the_title(); ?>" /></a></li> <?php endforeach; ?> </ul>
That’s it! The most important item you may want to change for your own custom field is the line : AND wpostmeta.meta_key = 'gallery-url'. Where you would change the text in bold to match your own custom field value.
Update:
Check out Austin from PressedWords comment below.
With his great advise I was able to figure out why all my attempts to use the query_post weren’t working. it came down to this line of code: <?php echo get_post_meta($post->ID, "gallery-url", $single = true); ?>, that was what I had in my code, and the $post->ID is the reason my code would not echo or print the custom field’s value. Solution? replace $post->ID with get_the_ID(). HA, so simple.
Tips & Tricks
Remove spaces when echoing the_title
Ever wanted to print or echo the WordPress title attribute without spaces?
This little trick can be useful for calling custom functions and printing the title with out spaces for W3C compatibility. I used this trick in a new theme called Galleria, which will be out for public download in the coming days.
Using this comes in handy for a delicious text link:
<?php $title = get_the_title(); ?>
<a href="http://del.icio.us/post?url=<?php echo $title; ?>&<?php echo str_replace(" ", "%20", $title); ?>">
Bookmark This (<?php echo $title; ?>)</a>
What I am doing is calling $title = get_the_title(); and using str_replace(" ", "%20", $title); to replace empty spaces with a %20, which is used in URL encoding empty spaces.
Alternatively you can use a dash or underscore.
Thanks to Jason Boyle for his adaption.
Tips & Tricks
Display the_excerpt only if there is text
Have you ever wanted to display the excerpt only if you write one? A simple couple lines of code can display the_excerpt any where you like.
In my new theme, I am using this coded trick to display the excerpt on a single post only if I’ve got text inside. Usually if you use the_excerpt and you don’t have one, it will fake one for you.
This is not something that I wanted to do on the single post page. So I used the following code to check if the excerpt existed.
if ( !empty( $post->post_excerpt ) ) :
Once this action is taken into account, you can factor in what code you want to out put if the post_excerpt isn’t empty.
if ( !empty( $post->post_excerpt ) ) : the_excerpt(); else : false; endif;
The above code checks if there is an excerpt and print’s it to the screen. If there isn’t an except, it doesn’t do anything.
This is a simple one.
/**
* Your Blog title
*
*/
function my_blog_title() {
$blogname = get_bloginfo('name');
return '<span class="blog-title">' . $blogname . '</span>';
}
add_shortcode('blog-title', 'my_blog_title');
Just add this to your functions.php file and then add [blog-title] in any post or page and it will return your Blog Title. :)
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Austin
January 17, 2009 at 1:49 pm
No need to query the database directly. You can use the WordPress API to accomplish the same thing:
<ul>
<?php
query_posts(array(
'meta_key' => 'gallery-url',
'showposts' => 8,
));
while( have_posts() ) : the_post(); ?>
<li><a href="<?php echo get_post_meta(get_the_ID(), "gallery-url", $single = true); ?>" title="<?php echo attribute_escape(sprintf('Link to %s', get_the_title())); ?>">
<img src="<?php echo get_post_meta(get_the_ID(), "image", $single = true); ?>" alt="<?php echo attribute_escape(get_the_title()); ?>" /></a></li>
<?php endwhile; ?>
</ul>
If you can, it’s usually better to use the WordPress API, because your code won’t have to change if the underlying database structure in WordPress changes (as it has before), you get the benefits of the built-in object caching (or caching plugins, if they’re being used), and it tends to allow better compatibility with other plugins.
Austin’s last blog post..WordPress Use Declines Among Top 100 Bloggers
frosty
January 17, 2009 at 3:03 pm
Thanks for that, I will give that code a shot. I tried so many variations, and it wouldn’t show the custom fields, just the html code I input.
😉
P.S. If that works I will write a post based on your recommended code!
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Guennadi M
June 14, 2009 at 8:56 am
To display custom field outside the loop, you need to make the post ID available outside the loop, as per http://www.ausbusiness.net/review/wordpress-custom-fields-outside-loop/
Guennadi M