WooCommerce: Change Input Type @ Checkout Fields

This challenging task (yet very simple at the end…!) was requested by one of my WooCommerce Support clients. As they trade in USA only, they wanted to force “numbers only” in the ZIP input field, so that letters would not be allowed. Strange WooCommerce doesn’t do this out of the box!

WooCommerce: Change a Checkout Field Input Type
WooCommerce: Change a Checkout Field Input Type

WooCommerce Snippet: Change ZIP to Input Type = Number

 * @snippet       Change a Checkout Field Input Type
 * @how-to        Get CustomizeWoo.com FREE
 * @sourcecode    https://businessbloomer.com/?p=19109
 * @author        Rodolfo Melogli
 * @compatible    WooCommerce 2.4.7

// Change field type to number woocommerce checkout

function bbloomer_change_checkout_field_input_type() {
echo "<script>document.getElementById('billing_postcode').type = 'number';</script>";
add_action( 'woocommerce_after_checkout_form', 'bbloomer_change_checkout_field_input_type');

Where to add this snippet?

You can place PHP snippets at the bottom of your child theme functions.php file (before "?>" if you have it). CSS, on the other hand, goes in your child theme style.css file. Make sure you know what you are doing when editing such files - if you need more guidance, please take a look at my free video tutorial "Where to Place WooCommerce Customization?"

Does this snippet (still) work?

Please let me know in the comments if everything worked as expected. I would be happy to revise the snippet if you report otherwise (please provide screenshots). I have tested this code with Storefront theme, the WooCommerce version listed above and a WordPress-friendly hosting on PHP 7+.

If you think this code saved you time & money, please join other Business Bloomer supporters and avail of 365 days of WooCommerce benefits. Thank you in advance :)

Need Help with WooCommerce Customization?

Check out these free video tutorials. You can start learning how to customize WooCommerce without unnecessary plugins. Watch me code and learn by example!

  • how-to-edit-woocommerce-with-php-snippets
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  • woocommerce-customize-single-product-page-PHP

Rodolfo Melogli

Author, WooCommerce expert and WordCamp speaker, Rodolfo has worked as a WooCommerce freelancer since 2011. His goal is to help entrepreneurs and developers overcome their WooCommerce nightmares. Rodolfo loves travelling, chasing tennis & soccer balls and, of course, wood fired oven pizza.

6 thoughts on “WooCommerce: Change Input Type @ Checkout Fields

  1. Hey, amazing work!
    I want to make it required that numbers AND letters are written. So, I change

    type = 'number';

    “number” with? Thank you so much.

    1. “text”

  2. You can also edit form type by edit forn field array on form-edit-address.php

    1. Of course – however it’s not a great idea to override WooCommerce templates 🙂

  3. hi, its a great solution! it´s works for me very well.

    Now i need the billing_first_name only you can type letters, numbers not.

    How can i do thath!


    1. Mauricio, thanks so much for your comment! Yes, this is possible – but unfortunately this is custom work and I cannot provide a complementary solution here via the blog comments. Thanks a lot for your understanding! ~R

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