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Setting In Stock filter to default to On

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The support doesn work on Saturdays and Sundays, so some Friday requests can be answered on Monday.
withsysad(@withsysad)
5 Posts
Customers
January 8, 2026, 16:47

Hi
Is it possible, and if so how, to default the In Stock filter/switch to on?

Many thanks

#1
Alex Dovlatov(@alexdev)
495 Posts
January 9, 2026, 13:42

Hello

Yes, it's possible to set the In Stock filter to be checked/enabled by default!

Solution

Add next code to your theme's functions.php file (child theme recommended):

add_filter('woof_get_request_data', 'woof_default_instock_on');
function woof_default_instock_on($data){
    $data['stock'] = 'instock';
    return $data;
}

How it works

This code uses the woof_get_request_data filter hook to automatically add stock=instock to the filter request data, making the In Stock checkbox checked by default when users land on your shop pages.

Where to add the code

  1. Recommended: Add to your child theme's functions.php file:
    • wp-content/themes/your-child-theme/functions.php
  2. Alternative: Use a plugin like"Code Snippets" to add the code safely

Important: Don't add this to the parent theme's functions.php as it will be overwritten when you update the theme!

This will make the In Stock filter active by default every time users visit your shop pages.

Also read: https://products-filter.com/manipulate-search-data-options/

#2
withsysad(@withsysad)
5 PostsTopic Author
Customers
January 9, 2026, 16:28

Hi Alex

thanks for the instructions. They were clear, easy to follow and did what I asked.

BUT...

The changes force the filter to be on, so it can no longer be turned off.

Is it possible to have it default to In Stock but allow it to be switched to the other setting - I am not sure what to call the opposite of In Stock in this circumstance.

Regards
John

#3