Dynamic image source

Developers
1

I need to display an ACF image field via the php function in the dynamic control, but I’m not sure I understand the format to get it.
The field is in a post pointing at by a parameter in the URL E.G. //http:…com/?post_id=123

So Im working on a snippet as follows:

$passed_postId = “”;
if ( isset($_GET[‘photo_id’])) {
$passed_postId = $_GET[‘photo_id’];
if ( get_field( ‘featured_image’, $passed_postId ) ) :
echo the_field( ‘featured_image’, $passed_postId );
else :
echo “No Image”;
endif;
else {
echo “No Post_ID in URL”;
}
endif;
}

however I don’t know how I’d implement this in the dynamic field in the builder

2

So investigating further, I found an example that used {echo:a_function()}, so I tried the following in the dynamic content field
{echo: getphoto( {url_parameter:photo_id} )}

with my function as

function getphoto($passed_postId) {

if ( get_field( 'featured_image', $passed_postId ) ) : 
        return the_field( 'featured_image', $passed_postId ); 
else :
		return "No Featured Image";
endif;

}

didn’t work, then I tried

{echo: get_the_post_thumbnail( {url_parameter:photo_id}, ‘large’ )}

still nothing. I tried hust using {url_parameter:photo_id} in a text element, and it shows the url parameter properly, so I’m not sure why I cannot get this to work.

I haven’t found any documentation about using dynamic data in an image widget to try.

3

So again, I’m getting closer. I found a warning that to use the {echo:} I had to declare the function names that I want to use. OK, at least it’s being called now, but not returning an image!

OR so I thought, it definately was called and then it’s no longer being called. I don’t understand why or how to debug it other than with echos

4

Hi

I modified your code (replace ‘bild_fur_kopf’ with the name of your ACF image field):

function getphoto() {
$passed_postId = htmlspecialchars($_GET["post_id"]);
if ( get_field( 'bild_fur_kopf', $passed_postId ) ) : 
    $image = get_field( 'bild_fur_kopf', $passed_postId );
     return esc_url($image['url']); 
     else :
		return "No Featured Image";
endif;
}

To use it, use an image element from Bricks and enter

{echo:getphoto()}

into the dynamic field like this:

Dyna
Dyna342×545 17.5 KB

The advantage of this is that you can use the normal image element functions of Bricks to format your image.

Cheers

Patric

5

By the way, the return format of the ACF image field must be image-array:

Dyna2
Dyna2415×668 25.5 KB

6

Thanks Patric,
I just don’t know why it’s not returning the featured image (yes I’ve checked the post has a featured image)

I’ve even echo’d out the post title, and it’s correct

function getphoto() {
$passed_postid = htmlspecialchars($_GET[“photo_id”]);
echo get_the_title($passed_postid); <<<<<<<<<<<<<<this works
if ( get_field( ‘featured_image’, $passed_postid ) ) :
$image = get_field( ‘featured_image’, $passed_postid );
return esc_url($image[‘url’]);
else :
return “No Featured Image”;<<<<<<<<<<but I always get this!
endif;
}

7

well, you want the featured image or an ACF image? your mistake is that the get_field function is for retrieving ACF fields. The post thumbnail is a standard wordpress field and you cannot retrieve it with the get_field function.

You wrote about the ACF image in your post… that’s why I made you the code for an ACF image field.

This is the code to get the Thumbnail:

function getphoto() {
if(isset($_GET['post_id'])){
$passed_postId = htmlspecialchars($_GET['post_id']);
$image = get_the_post_thumbnail_url($passed_postId);
if ( !empty($image) ) : 
     return $image; 
     else :
	 return "No Featured Image";
endif;
}
}

Cheers

Patric

8

Sorry Partic, I’ve called the field “image” in the ACF field group, of type “featured_image”.

Thanks again, it’s working now.

Regards
Pete