MediaWiki:Timeless.js

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/* All JavaScript here will be loaded for users of the Timeless skin */

/* Sticky wiki tools and sidebar */
var siteTools = document.getElementById('site-tools');
var sideCatLinks = document.getElementById('catlinks-sidebar'); 

var sideCatLinksVisible = false;

// Check if catlinks-sidebar exists
if (sideCatLinks) {
    var visibleCats = sideCatLinks.querySelectorAll(".mw-normal-catlinks ul li");
    var hiddenCats = sideCatLinks.querySelectorAll(".mw-hidden-catlinks ul li");

    // Hide if no visible categories and some hidden ones
    if (visibleCats.length === 0 && hiddenCats.length > 0) {
        sideCatLinks.style.display = "none";
    }

    // Check if it's visible after all that
    sideCatLinksVisible = sideCatLinks.style.display !== "none";
}

// Apply sticky logic
if (sideCatLinksVisible) {
    // Make catlinks-sidebar sticky
    sideCatLinks.style.position = "sticky";
    sideCatLinks.style.top = "70px";

    // Remove sticky from site-tools
    if (siteTools) {
        siteTools.style.position = "";
        siteTools.style.top = "";
    }
	else {
    // Make site-tools sticky
    if (siteTools) {
        siteTools.style.position = "sticky";
        siteTools.style.top = "70px";
    }
	}
    // Remove sticky from catlinks-sidebar (if it exists)
    if (sideCatLinks) {
        sideCatLinks.style.position = "";
        sideCatLinks.style.top = "";
    }
}