MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
document.addEventListener("DOMContentLoaded", function() {
    // Check if search box exists in the sidebar already
    if (!document.querySelector("#p-search")) {
        var sidebar = document.querySelector("#mw-panel"); // Find the sidebar
        if (sidebar) {
            var searchBox = document.createElement("div");
            searchBox.id = "p-search";
            searchBox.innerHTML = `
                <form action="/index.php" method="get">
                    <input type="hidden" name="title" value="Special:Search">
                    <input type="search" name="search" placeholder="Search..." required>
                </form>
            `;
            sidebar.insertBefore(searchBox, sidebar.firstChild); // Add search box to the top of the sidebar
        }
    }
});