Hello,
I’m using a select field in ACF, the field is for selecting a city in the UK, so I have a big list of cities in that custom field. I then use this field in pages, each page should have a city.
What I want to do is to make a filter option in the index page and I don’t want all the cities to be visible, I just want the cities that has been selected in a page.
Example: I have 20 pages, 10 pages selected “London” and the other 10 pages selected “Liverpool”, in the index I don’t want all the options to be visible in the select menu, I just want “London” and “Liverpool” that has been already selected in pages.
How can I do that?
Thanks.
You need to do a query of all of the posts where this field is used and then loop through all of the posts to collect a list of the values that are actually used. The only place that information is stored is in the _postmeta table related to each post.
For example:
global $post;
$cities = array();
$args = array(
'post_type' => 'page',
'posts_per_page' => -1
)
$query = new WP_Query($args);
if ($query->have_posts()) {
while ($query->have_posts()) {
$query->the_post();
$city= get_field('city-field-name');
if (!in_array($cities)) {
$cities[] = $city;
}
}
}
Thank you for the help, your code solved my question but there is a small error.
it should be if (!in_array($city, $cities)) { not if (!in_array($cities)) {
Thank you.
Sorry for the typo, that happens sometimes when I type code into the editor, I’m used to a coding tool that flags missing arguments like that.
