woocommerce_wp_select()
function does not support multiselect, you can open the wc-meta-box-functions.php
file in /woocommerce/includes/admin
directory to see the default behavior.
But what's stopping you to create your own function that will be based on the default Woo function, and add the required features, or even change the default function ( but still, modifying the plugin files is not the best practice ). Here's an example of how to write a new function with multiple support, the only changes from original are added support for name and multiple attributes, and different logic for the selected items ( since post meta is now an array ).
function woocommerce_wp_select_multiple( $field ) {
global $thepostid, $post, $woocommerce;
$thepostid = empty( $thepostid ) ? $post->ID : $thepostid;
$field['class'] = isset( $field['class'] ) ? $field['class'] : 'select short';
$field['wrapper_class'] = isset( $field['wrapper_class'] ) ? $field['wrapper_class'] : '';
$field['name'] = isset( $field['name'] ) ? $field['name'] : $field['id'];
$field['value'] = isset( $field['value'] ) ? $field['value'] : ( get_post_meta( $thepostid, $field['id'], true ) ? get_post_meta( $thepostid, $field['id'], true ) : array() );
echo '<p class="form-field ' . esc_attr( $field['id'] ) . '_field ' . esc_attr( $field['wrapper_class'] ) . '"><label for="' . esc_attr( $field['id'] ) . '">' . wp_kses_post( $field['label'] ) . '</label><select id="' . esc_attr( $field['id'] ) . '" name="' . esc_attr( $field['name'] ) . '" class="' . esc_attr( $field['class'] ) . '" multiple="multiple">';
foreach ( $field['options'] as $key => $value ) {
echo '<option value="' . esc_attr( $key ) . '" ' . ( in_array( $key, $field['value'] ) ? 'selected="selected"' : '' ) . '>' . esc_html( $value ) . '</option>';
}
echo '</select> ';
if ( ! empty( $field['description'] ) ) {
if ( isset( $field['desc_tip'] ) && false !== $field['desc_tip'] ) {
echo '<img class="help_tip" data-tip="' . esc_attr( $field['description'] ) . '" src="' . esc_url( WC()->plugin_url() ) . '/assets/images/help.png" height="16" width="16" />';
} else {
echo '<span class="description">' . wp_kses_post( $field['description'] ) . '</span>';
}
}
echo '</p>';
}
Example of how to use the function:
woocommerce_wp_select_multiple( array(
'id' => 'newoptions',
'name' => 'newoptions[]',
'class' => 'newoptions',
'label' => __('Testing Multiple Select', 'woocommerce'),
'options' => array(
'1' => 'User1',
'2' => 'User2',
'3' => 'User3',
))
);