nextcloud/php/public/base_path.js

// SPDX-FileCopyrightText: 2025 Nextcloud GmbH <https://nextcloud.com>
// SPDX-License-Identifier: AGPL-3.0-only

document.addEventListener("DOMContentLoaded", function() {
    basePath = document.getElementById("base_path")
    if (basePath) {
        // Remove '/containers' from the end of the path, to get the base path only
        basePath.value = window.location.pathname.slice(0, -11);
    }
});