Actively formats phone number into XXX-XXX-XXXX format

pmpro-format-phone-number.php

<?php   // do not copy this line.
/**
 * This recipe will Actively formats phone number into XXX-XXX-XXXX format
 * on the PMPro chekcout page. if not using the billing phone, change line 18 # to be the id of your custom field
 * 
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function format_phone_number()
{
	//Adapted from: http://stackoverflow.com/questions/26412623/jquery-or-javascript-to-autoformat-phone-mask
	
	echo
	"<script>
	<!--
	jQuery('#bphone').keyup(function(ev) {
		var key = ev.which;
		if (key < 48 || key > 57 || key != 45) {
		ev.preventDefault();
	}

	if (this.value.length > 12) {
		this.value = this.value.slice(0, -1);
		return;
	}

	this.value = this.value.replace(/^(\d{3})(\d)/, '$1-$2').replace(/^(\d{3}-\d{3})(\d)/, '$1-$2');
	});
	-->
	</script>";
}

add_action("pmpro_checkout_after_form", "format_phone_number");