Saving data to WooCommerce session

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I’m attempting to save a simple text input to the WooCommerce session. The session is created when a user adds something to their cart.

My input field exists in custom page template that will be placed in the user flow after the cart but before the checkout: cart > my template > checkout.

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So far

Simple form to capture data (custom template file) 

<form name="group" method="post" class="checkout woocommerce-checkout" action="http://localhost:/site.dev/my-template">
    <div class="group-order">
        <p class="form-row form-row woocommerce-validated" id="create_new_group_field">
            <label for="create_new_group" class="">Join an existing group</label>
            <input type="text" class="input-text " name="create_new_group" id="create_new_group">
        </p>
    </div>
</form>

Receiving and setting data (I’m having trouble figuring out when/how to run this. in my custom page)

UPDATE
I’ve added the code below to the top of my page template so the page processes itself and then re-directs to the checkout.

function set_and_save_input_to_session() { 

if( !is_admin( ) ) {
    // User input
    if( ! empty( $_POST['create_new_group'] ) ) {
        $group_input_value =  $_POST['create_new_group']; 

        // Set session and save data
        WC()->session->set( 'group_order_data', $group_input_value );

        wp_redirect( 'http://localhost:28/site.dev/checkout' );
        exit();
    }
}
get_header();

add_action(‘woocommerce_checkout_process’, ‘set_and_save_input_to_session’);

Retrieving and saving data 

function retrieve_and_save_group_input_value_to_order_meta() {
    $retrived_group_input_value = WC()->session->get( 'group_order_data' );

    update_post_meta( $order_id, '_create_new_group', $retrived_group_input_value );
}
add_action('woocommerce_checkout_update_order_meta', 'retrieve_and_save_group_input_value_to_order_meta');

I’m currently working my way through what are to me, more complex solutions and therefore I’d appreciate if anyone could point out any major flaws with my process so far.

UPDATE

I can confirm that the form is receiving data and that the WC()->session->set is setting data. (Thanks to @Firefog for suggesting the use the $_SESSION global)

After further investigation and finding the right place to var_dump the session data I found that the data was being set to the session with my original method.

The data is set, but I can’t see why the data won’t save to the order.

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2 comments

  1. It’s more saying Thank you for solving my problem. But here is an answer, too:

    The post meta could not been updated because there is no $order_id parameter in your callback function. This should do the trick:

    function retrieve_and_save_group_input_value_to_order_meta( $order_id ) {
    $retrived_group_input_value = WC()->session->get( 'group_order_data' );

    update_post_meta( $order_id, '_create_new_group', $retrived_group_input_value );
}
add_action('woocommerce_checkout_update_order_meta', 'retrieve_and_save_group_input_value_to_order_meta');

  2. Here is another approach.

    1st page:

     session_start();//place this at the top of all code
 $data = $_POST['create_new_group'];
 $_SESSION['custom_create_new_group']=$data;

    Now in another page write the following to receive the value:

    session_start(); //optional     
$retrive_price =  $_SESSION['custom_create_new_group'];

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