How to add default value in custom taxonomy field in wordpress - wordpress

Question

I've created custom taxonomy name "Front List" using Custom Post Type UI then add a custom field called "Order". I'm trying to set a default value for order. When I create any frontlist using the frontlist panel,
it's adding a default value, but when I create frontlist from "Add Post" page it's not adding any default value for "Order field".
How to I add default value when "Front List" created from "Add Post" page?
This is the code for adding a custom field to Frontlist taxonomy.
<?php
/**
* Adding Custom Field to Taxonomy
* #return void
*/
function frontlists_add_order( $term ) {
?>
<div class="form-field">
<label for="taxOrder"><?php _e( 'Order', 'yourtextdomain' ); ?></label>
<input type="text" name="taxOrder" id="taxOrder" value="">
<p>Your front List item will be sorted by this "Order". The default value is "1".</p>
</div>
<?php
}
add_action( 'frontlists_add_form_fields', 'frontlists_add_order', 10, 2 );
/**
* Adding Custom Field to Taxonomy in Edit Panel
* #return void
*/
function frontlists_edit_order( $term ) {
$term_order = get_term_meta( $term->term_id, 'order', true );
?>
<tr class="form-field">
<th><label for="taxOrder"><?php _e( 'Order', 'yourtextdomain' ); ?></label></th>
<td>
<input type="text" name="taxOrder" id="taxOrder" value="<?php echo esc_attr( $term_order ) ? esc_attr( $term_order ) : ''; ?>">
<p>Your front List item will be sorted by this "Order".</p>
</td>
</tr>
<?php
}
add_action( 'frontlists_edit_form_fields', 'frontlists_edit_order', 10 );
/**
* Saving Custom Field to Taxonomy
*/
function frontlists_save_order( $term_id ) {
if ( isset( $_POST['taxOrder'] ) ) {
$term_order = $_POST['taxOrder'];
if( $term_order ) {
update_term_meta( $term_id, 'order', $term_order );
} else {
update_term_meta( $term_id, 'order', 1 );
}
}
}
add_action( 'edited_frontlists', 'frontlists_save_order' );
add_action( 'create_frontlists', 'frontlists_save_order' );

Answer 1

You can use the created_term action hook to add the new taxonomy term once it's already been added to the database. This action hook is inside the wp_insert_term function. Either put this in your theme (not advised), or inside a plugin.
function so_add_order_field( $term_id, $tt_id, $taxonomy ) {
// The default order value
$default = 1;
// Stop if it's not the right taxonomy
if ( 'frontlists' != $taxonomy ) {
return false;
}
// Get the existing value if exists
$order = get_term_meta( $term_id, 'taxOrder', true );
if ( false === $order ) {
// Add the term meta default
add_term_meta( $term_id, 'taxOrder', $default );
}
}
add_action( 'created_term', 'so_add_order_field', 10, 3 );
Then change the $default value to whatever you'd like it to be. This uses the add_term_meta function which safely adds the meta data to the database for you. Check out the documentation for further info.