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$10
Display Default Image if Custom Field Empty

I have a custom field which is used to hold an image. The field outputs find when displayed as:

<img src="<?php global $post; echo get_post_meta($post->ID, 'custom_image_field', true); ?>" alt="Visit Product" title="Visit Product"/>


I am now trying to create a function so that if the field is left blank, a default image is displayed instead.

I have the following code so far, but just can't get it working:

function default_image() {

$image = get_post_meta($post->ID, 'custom_image_field', true);

	if(is_singular( 'reviews' ) && empty( $image ) ) { ?>

<a href="http://domain.com" title="Custom Field><img src="<?php echo $image; ?>" alt="Custom Field"/></a>

<? }

        else if(is_singular( 'reviews' ) && !empty( $image ) ) { ?>

<a href="http://domain.com" title="Default Image"><img src="http://domain.com/default-image.jpg" alt="Default Image" title="Default Image"/></a>

<? }

}

add_action('thesis_hook_before_sidebars', 'default_image', 1);

This question has been answered.

robster | 01/19/12 at 8:24am Edit


(6) Possible Answers Submitted...

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  • avatar
    Last edited:
    01/19/12
    8:52am
    Julio Potier says:

    Hello just reverse the "!" and add "$post" to global declaration.

    function default_image() {
    
global $post;
    
$image = get_post_meta($post->ID, 'custom_image_field', true);
    
	if(is_singular( 'reviews' ) && !empty( $image ) ) { ?>
    
<a href="http://domain.com" title="Custom Field><img src="<?php echo $image; ?>" alt="Custom Field"/></a>
    
<? }
    
        else if(is_singular( 'reviews' ) && empty( $image ) ) { ?>
    
<a href="http://domain.com" title="Default Image"><img src="http://domain.com/default-image.jpg" alt="Default Image" title="Default Image"/></a>
    
<? }
    
}
    
add_action('thesis_hook_before_sidebars', 'default_image', 1);

    Previous versions of this answer: 01/19/12 at 8:29am | 01/19/12 at 8:52am

    • 01/19/12 8:49am

      robster says:

      Thanks - just needed the global declaration and the new code now looks like Christianto posted below.

    • 01/19/12 8:53am

      Julio Potier says:

      edit :
      !empty( $image )
      instead of
      empty( !$image )
      misstyped ...

  • avatar
    Last edited:
    01/19/12
    8:28am
    Christianto says:

    add Global $post

    function default_image() {
    global $post;
    $image = get_post_meta($post->ID, 'custom_image_field', true);

    if(is_singular( 'reviews' ) && empty( $image ) ) { ?>

    <a href="http://domain.com" title="Custom Field><img src="<?php echo $image; ?>" alt="Custom Field"/></a>

    <? }

    else if(is_singular( 'reviews' ) && !empty( $image ) ) { ?>

    <a href="http://domain.com" title="Default Image"><img src="http://domain.com/default-image.jpg" alt="Default Image" title="Default Image"/></a>

    <? }

    }

    add_action('thesis_hook_before_sidebars', 'default_image', 1);

    • 01/19/12 8:50am

      robster says:

      Thanks - works brilliantly!

    • 01/19/12 9:08am

      Christianto says:

      I'm glad to help,

      its not only declare global but also turned around "!" before empty() like every one said..
      I think you should split the prize when vote...

      btw, from the hook it look like it run on sidebar?

      if you have some new query after your content this could be a problem.
      I don't know if the hook is running on post init or widget/sidebar call but just in case it run on widget/sidebar called the you should save var $post of main query into new variable and declare it inside the function..

      Hope this help..



  • avatar
    Last edited:
    01/19/12
    8:28am
    Jens Filipsson says:

    Haven't you turned it around? Shouldn't it be like this:

    function default_image() {
    

    
$image = get_post_meta($post->ID, 'custom_image_field', true);
    

    
	if(is_singular( 'reviews' ) && !empty( $image ) ) { ?>
    

    
<a href="http://domain.com" title="Custom Field><img src="<?php echo $image; ?>" alt="Custom Field"/></a>
    

    
<? }
    

    
        else if(is_singular( 'reviews' ) && empty( $image ) ) { ?>
    

    
<a href="http://domain.com" title="Default Image"><img src="http://domain.com/default-image.jpg" alt="Default Image" title="Default Image"/></a>
    

    
<? }
    

    
}
    

    
add_action('thesis_hook_before_sidebars', 'default_image', 1);

  • avatar
    Last edited:
    01/19/12
    8:29am
    Daniele Raimondi says:

    Try to invert the condition. You are using the default if the custom field is not empty.

    • 01/19/12 8:52am

      robster says:

      Well spotted - thanks Daniele!

  • avatar
    Last edited:
    01/19/12
    8:30am
    Arnav Joy says:

    try this

    $image = get_post_meta($post->ID, 'custom_image_field', true);

    if(!empty( $image ) ) { ?>

    <a href="http://domain.com" title="Custom Field><img src="<?php echo $image; ?>" alt="Custom Field"/></a>

    <? }

    else { ?>

    <a href="http://domain.com" title="Default Image"><img src="http://domain.com/default-image.jpg" alt="Default Image" title="Default Image"/></a>

    <? }

    • 01/19/12 8:37am

      Arnav Joy says:

      try this

      function default_image() {

      $image = get_post_meta($post->ID, 'custom_image_field', true);

      if(is_singular( 'reviews' ) && !empty( $image ) ) { ?>

      <a href="http://domain.com" title="Custom Field><img src="<?php echo $image; ?>" alt="Custom Field"/></a>

      <? }

      else { ?>

      <a href="http://domain.com" title="Default Image"><img src="http://domain.com/default-image.jpg" alt="Default Image" title="Default Image"/></a>

      <? }

      }

      add_action('thesis_hook_before_sidebars', 'default_image', 1);

  • avatar
    Last edited:
    01/19/12
    8:41am
    Gabriel Reguly says:

    Hi robster,

    Please try this code:


    
function default_image() {
    
	global $post;        
    
	if ( is_singular( 'reviews' ) {
    
		$image = get_post_meta($post->ID, 'custom_image_field', true);
    
		if ( $image ) ) {
    
 ?>
    
	<a href="http://domain.com" title="Custom Field><img src="<?php echo $image; ?>" alt="Custom Field"/></a>
    
<?php
    
		} else {  // empty( $image )
    
?>	 
    
	<a href="http://domain.com" title="Default Image"><img src="http://domain.com/default-image.jpg" alt="Default Image" title="Default Image"/></a>
    
<?php
    
		}
    
	}
    
}
    
add_action('thesis_hook_before_sidebars', 'default_image', 1);



    Regards,
    Gabriel

    Previous versions of this answer: 01/19/12 at 8:41am

This question has expired.



Gabriel Reguly, Charles Klycinski, Francisco Javier Carazo Gil, robster voted on this question.



Current status of this question: Completed



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