The two functions below require you to first set the parent variable product ID and then, in the first function, assign each variation ID with a corresponding fixed quantity.
To dynamically set the input quantity based on each selected variation, the only way is to use Javascript (JQuery). This is achieved in the second function.
Here is the code:
add_filter( 'woocommerce_available_variation', 'custom_variation_min_max_qty', 10, 3 );
function custom_variation_min_max_qty( $data, $product, $variation ) {
// Set your variable product ID
$variable_id = 73;
if( $product->get_id() == $variable_id ) {
// Set 1st variation ID
if( $variation->get_id() == 1015 ){
$qty = 3; // Set the quantity
}
// Set 2nd variation ID
elseif( $variation->get_id() == 1014 ){
$qty = 6; // Set the quantity
}
// Set 3rd variation ID
elseif( $variation->get_id() == 1013 ){
$qty = 12; // Set the quantity
}
}
if( isset($qty) ) {
$data['min_qty'] = $qty;
$data['max_qty'] = $qty;
}
return $data;
}
add_action( 'woocommerce_after_single_variation', 'change_variation_input_quantity_script' );
function change_variation_input_quantity_script() {
global $product;
// Set your variable product ID
$variable_id = 73;
if( $product->get_id() != $variable_id ) return;
// Output Javascript
?>
<!-- JS Thankyou Script -->
<script type="text/javascript">
jQuery(function($) {
var a = 'div.quantity > input.qty';
// On load
setTimeout(function(){
$(a).val($(a).prop('min'));
}, 300);
// On change / select a variation
$('.variations_form select').on( 'blur', function(){
if( $('input[name="variation_id"]').val() > 0 )
$(a).val($(a).prop('min'));
})
});
</script>
<?php
}
Place this code in the function.php file of your active child theme (or active theme). It has been tested and proven to work.
It is possible to automate the correct variation detection based on specific product attribute values...
In the example given, this can be achieved by targeting the color product attribute value of a variation. In the function, you will need to define the "Color" product attribute taxonomy as pa_color.
Therefore, you would replace the first function with the following:
add_filter( 'woocommerce_available_variation', 'custom_variation_min_max_qty', 10, 3 );
function custom_variation_min_max_qty( $data, $product, $variation ) {
// Set your variable product ID
$variable_id = 73;
if( $product->get_id() == $variable_id ) {
// Define your product attribute (always start with "pa_" + the slug)
$taxonomy = 'pa_color';
foreach($data['attributes'] as $attribute => $value_slug ){
if( $attribute == 'attribute_' . $taxonomy ) {
// Set your color slugs below with the correct quantity
if ( $value_slug == 'red' )
{
$qty = 3; // Set the quantity for "Red" color
break;
}
elseif ( $value_slug == 'blue' )
{
$qty = 6; // Set the quantity for "Blue" color
break;
}
elseif ( $value_slug == 'green' )
{
$qty = 12; // Set the quantity for "Green" color
break;
}
}
}
}
if( isset($qty) ) {
$data['min_qty'] = $qty;
$data['max_qty'] = $qty;
}
return $data;
}
You should keep the second function as it is.
Place this code in the function.php file of your active child theme (or active theme). It has been tested and proven to work.