User:Alex Smotrov/wlunwatch.js

var wlUnwatch = new function(){
 
var unWatchLinks = [];
var watchMsg = window.wgAjaxWatch ? wgAjaxWatch.watchMsg : 'Watch';
var unwatchMsg = window.wgAjaxWatch ? wgAjaxWatch.unwatchMsg : 'Unwatch';
var wlForm;
var inProgress = null;
var timeoutID = null;
 
this.onLoad = function() { //public method
	if (!(wlForm = document.forms[0]) || !wlForm.namespace) return;
        var content = document.getElementById('content') || document.getElementById('mw_content')
	var links = content.getElementsByTagName('a');
	for (var i = 0; i < links.length; i++){ //append (x) links after history links
		if (!links[i].href.match(/[?&]action=history([&#]|$)/)) continue;
		var unwatch = document.createElement('a');
		unwatch.href = wgServer+wgScript+'?action=unwatch&title='+encodeURIComponent(links[i].title);
		unwatch.onclick = onClick;
		unWatchLinks.push(unwatch);
		var nextEl = links[i].nextSibling.nextSibling; //item after )
		nextEl.parentNode.insertBefore(document.createTextNode(' ('), nextEl);
		nextEl.parentNode.insertBefore(unwatch, nextEl);
		nextEl.parentNode.insertBefore(document.createTextNode(') '), nextEl);
		setUnwatchLink(unwatch, false);
	}
}
 
 
function setUnwatchLink (unwatchLink, state) {
	unwatchLink.innerHTML = state ? '+' : 'x';
	unwatchLink.title = state ? watchMsg : unwatchMsg;
}
 
function getPgName (unwatchLink){
	return decodeURIComponent(unwatchLink.href.match(/&title=(.+)/)[1]);
}
 
 
 function onClick(e) {
	if (inProgress) return false;
	if (!e) var e = window.event;
	if (e.target) var targ = e.target; else if (e.srcElement) var targ = e.srcElement;
	inProgress = getPgName(targ);
	timeoutID = window.setTimeout(	function() {inProgress = null},	10000	); 
	//call server
	var action = (targ.innerHTML == 'x') ? 'u' : 'w';
	sajax_do_call('wfAjaxWatch', [inProgress, action], showResult);
	return false;
}
 
 
function showResult (request) {
	if (timeoutID) window.clearTimeout(timeoutID);
	var response = request.responseText;
	if (window.wlUnwatchShowMsg) jsMsg (response.substr(4), 'watch');
	var name = inProgress, name2 = name, state, prefix, idx, ns = 0, pg, i, el; 
	inProgress = null;
	if (response.match(/^<u#>/))  
		state = true
	else if (response.match(/^<w#>/))
		state = false
	else return; //unrecognized response
	//find the name of "other page"
	if ((idx = name.indexOf(':')) != -1){ //not main namespace
		prefix = name.substring(0,idx);
		name2 = name.substring(idx + 1)
		for (i=2; i < wlForm.namespace.options.length; i++)
			if (wlForm.namespace.options[i].text == prefix)
				ns = i - 1;
		if (ns == 0) name2 = name; // guess : was a  part of the page name
	}
	if (ns % 2)	ns--; else ns++; //switch to  "other" namespace
	if (ns > 0) name2 = wlForm.namespace.options[ns+1].text + ':' +  name2;
	//now mark all pages that are either name or name2
	for (i=0; i<unWatchLinks.length; i++)
		if ((pg = getPgName(unWatchLinks[i])) && (pg==name || pg==name2)) {
			setUnwatchLink (unWatchLinks[i], state);
			el = unWatchLinks[i]; //now mark the whole line
			while ((el=el.previousSibling) && (el.nodeName!='DIV') && (el.nodeName!='BR')) 
				if (el.style) el.style.textDecoration = state ? 'line-through' : '';
		}
}
 
}//obj
 
 
if (wgCanonicalSpecialPageName && wgCanonicalSpecialPageName=='Watchlist' && wgAction=='view') {
	if (doneOnloadHook) wlUnwatch.onLoad(); //if imported dynamically
	else addOnloadHook (wlUnwatch.onLoad)
}