Auto-populate input form field from URL parameters - php

Question

I have a button on a woocommerce page (http://.../product/abcd/) that has a button "Book Appointments Now" that links to another page with form fields to submit (http://.../booking-appointments/?id=1238&sku=1) which has ProductID and SKU on the URL of that product from the previous page.
I want it to auto-populate the ProductID field automatically each time this page loads from the URL parameters.
Any help is appreciated.

Answer 1

To auto populate the product ID and the product SKU in your booking form (page), you should try this (without any guaranty as it can be tested for real on your page form):
add_action( 'wp_footer', 'autopopulate_product_id_script' );
function autopopulate_product_id_script() {
if( isset( $_GET['id'] ) ):
?>
<script type="text/javascript">
(function($){
$('input[name="productid"]').val("<?php echo $_GET['id']; ?>");
$('input[name="productsku"]').val("<?php echo $_GET['sku']; ?>");
})(jQuery);
</script>
<?php
endif;
}
Code goes in function.php file of your active child theme (or theme) or also in any plugin file.
The product id and the product sku need to be passed in url something like: http//www.example.com/booking-page/?id=124&&sku=AH1584
And your <imput> text fields should be something like:
<input type="text" name="productid" val="">
<input type="text" name="productsku" val="">
So for the product sku is something similar, that you will be able to add with ease…
But as javascript is already very active in you "Easy Appointments" booking form, I don't know if this will work.
This answer is related to: Add custom "Booking" button to WooCommerce Product single pages

Answer 2

You can pass the product ID and SKU in the URL and get it via $_GET. Then load it into the input field. Here's an example:
http://www.example.com/?product-id=123&sku=abcd456
Then use $_GET to get the URL parameters:
$productId = $_GET['product-id'];
$sku = $_GET['sku'];
Your input field would be like this:
<label for="product-id">Product ID:</label> <input type="text" name="product-id" id="product-id" value="<?php echo $productId; ?>" disabled>
I even added a disabled attribute to prevent the user/customer from editing the product ID. You can use PHP to secure it from the backend when the form gets submitted.