UTM to forms

main.js

/* UTM to Forms Begin */
document.addEventListener('DOMContentLoaded', function () {
	if (window.localStorage) {
		const params = new URLSearchParams(window.location.search);
		const utmParams = ['utm_source', 'utm_medium', 'utm_content', 'utm_campaign', 'utm_term'];
		utmParams.forEach(param => {
			const value = params.get(param);
			if (value !== null && value !== "") {
				localStorage.setItem(param, value);
			}
		});
	} else {
		console.error('No localStorage in window');
	}

	const forms = document.querySelectorAll('form');
	forms.forEach(form => {
		const utmParams = ['source', 'medium', 'content', 'term', 'campaign'];
		utmParams.forEach(param => {
			const input = document.createElement('input');
			input.type = 'hidden';
			input.name = `utm_${param}`;
			input.value = localStorage.getItem(`utm_${param}`) || '';
			form.appendChild(input);
		});
	});
});
/* UTM to Forms End */