Reply To: Query posts based on radio button field

• Elliot

• November 7, 2013 at 10:18 am

Hi @bounty_digital

I don’t think your code is following the correct logic path for this to work.
Your code needs to be spit up into 2 parts:

1. Create the radio button where a user can select the category and then be redirected to the archive url with the $_GET param

2. hook into the pre_get_posts filter and look for the $_GET param. If it exists, add the meta query in.

I should really write a tutorial for this one, so I’m happy to write the code. This is the most simple way to get it working:

<?php 

$field = get_field_object("field_5039a99716d1d");

?>
<form action="<?php echo home_url('slug/to/archive'); ?>" method="get">
	<ul>
	<?php foreach( $field['choices'] as $k => $v ): ?>
		<li>
			<label><input type="radio" name="acf_category" value="<?php echo $k; ?>" /><?php echo $v; ?></label>
		</li>
	<?php endforeach; ?>
	</ul>
	<input type="submit" value="Go" />
</form>

<?php 

add_filter( 'pre_get_posts', 'my_pre_get_posts' );

function my_pre_get_posts( $query ) {
	
	if( isset($_GET['my_custom_category']) )
	{
		// $query is the WP_Query object, set is simply a method of the WP_Query class that sets a query var parameter
		$query->set( 'meta_key', 'acf_field_name' );
		$query->set( 'meta_value', $_GET['acf_category'] );
	}
	return $query;
}

 ?>

This code has not been tested, you can see the 2 parts of code. The rest will be up to you to test it and fix any issues it contains!

Good luck

Thanks
E