MediaWiki:Common.js

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// @name        fixTalkArchiveToc
// @version     1.0
// @description Removes the "1 This is an Archive Page" element from the TOC on Talk Archives
// @copyright   (c) 2013, Cole Johnson <coleharrisjohnson@gmail.com>
function fixTalkArchiveToc() {
	// Is there a "This is an Archive Page" header block?
    if ($("table[id=archive-page-notice]").length != 0) {
        var toc = $("table[id=toc]"); // Is there a TOC?
		if (toc.length != 0) {
			// relocate to the children of the TOC table
			toc = toc[0].children;
			// MediaWiki is consistent, so don't check length first
			if (toc[0].localName == "tbody") {
				toc = toc[0].children; // skip the tbody tag
			}
			// Nav to the "ul"; 
			toc = toc[0].children[0].children[1].children; // "ul" -> "{li}"
			
			// remove "This is an Archive Page" entry
			toc[0].remove();
			
			// Cleanup
			fixTocSectionNums();
		}
    }
}

// @name        fixTocSectionNums
// @version     1.0
// @description Decrements the section number of each TOC entry
// @copyright   (c) 2013, Cole Johnson <coleharrisjohnson@gmail.com>
function fixTocSectionNums() {
	var sec = $("span[class=tocnumber]");
	var len = sec.length;
	var split;
	for (var i = 0; i < len; i++) {
		split = sec[i].innerText.split(".");
		split[0]--;
		sec[i].innerText = split.join(".");
	}
}

fixTalkArchiveToc();