rDrama/files/assets/js/post_navigation.js

let post_permalinks = sessionStorage.getItem("post_permalinks")

if (post_permalinks) {
	post_permalinks = post_permalinks.split(', ');
	const current_index = post_permalinks.indexOf(`'${location.href}'`)
	if (current_index > -1) {
		const permalink_after = post_permalinks[current_index+1]

		if (permalink_after) {
			for (const btn of document.getElementsByClassName('post_navigation')) {
				btn.classList.remove('d-none')
				btn.href = permalink_after.slice(1, -1)
			}
		}
	}
}