MediaWiki:Extensions/history.js

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// <pre>
// At http://openwetware.org/wiki/User:Austin/Extensions/history.js
// Author: Austin Che
//
// This only works with MediaWiki > 1.8 (which defines wgPageName as Javascript variable)
// Add the following line to User:YOURNAME/monobook.js
// document.write('<script type="text/javascript" src="http://openwetware.org/index.php?title=User:Austin/Extensions/history.js&action=raw&ctype=text/javascript"></script>');

if (document.getElementById && wgPageName && addOnloadHook)
    addOnloadHook(initVisitHistory);

var historyNumSaved = 20;
var historyExpiration = 30;     // days
var historyCookieName = "wikihist";
var historyList = new Array();

function setCookie(name, value, days)
{
    var expires = "";
	if (days) 
    {
		var date = new Date(); // current time
		date.setTime(date.getTime() + (days*24*60*60*1000));
		expires = "; expires=" + date.toGMTString();
	}
	document.cookie = name + "=" + escape(value) + expires + "; path=/";
}

function getCookie(name)
{
    // returns the value of the cookie with name

    if (! document.cookie.length)
        return null;

    // search for cookie
    var search = name + "=";
    var offset = document.cookie.indexOf(search);
    if (offset == -1)
        return null;            // no such cookie

    // set offset to the beginning of the cookie value
    offset += search.length;

    var end = document.cookie.indexOf(";", offset); // find end
    if (end == -1)
        end = document.cookie.length;

    return unescape(document.cookie.substring(offset, end));
}

function loadSaveHistory()
{
    var cookie = getCookie(historyCookieName);

    // using | as separator as it is not valid in wiki page name
    if (cookie)
        historyList = cookie.split('|');

    for (var i = 0; i < historyList.length; i++)
    {
        if (historyList[i] == wgPageName)
        {
            historyList.splice(i, 1);
            break;
        }
    }

    // add current page to beginning of history list
    if (historyList.length == 0 || historyList[0] != wgPageName)
        historyList.unshift(wgPageName);

    if (historyList.length > historyNumSaved) 
        historyList = historyList.slice(0, historyNumSaved);

    setCookie(historyCookieName, historyList.join('|'), historyExpiration);
}

function jumpToHistoryPage()
{    
    var hist = document.getElementById('visithistory');
    if (!hist.changed)
        return false;

    var page = hist.options[hist.selectedIndex].text;
    var s = new String(wgArticlePath);
    s = s.replace(/\$1/, page);
    var url = wgServer + encodeURI(s.toString());
    window.location = url;
    
    return true;
}

function historyClicked()
{
    this.changed = true;
}


function historyFocus()
{
    this.initValue = this.value;
    return true;
}

function historyKeydown(e)
{
    var theEvent;
    var keyCodeTab = "9";
    var keyCodeEnter = "13";
    var keyCodeEsc = "27";
    
    if (e)
        theEvent = e;
    else
        theEvent = event;

    if ((theEvent.keyCode == keyCodeEnter || theEvent.keyCode == keyCodeTab) && this.value != this.initValue)
    {
        this.changed = true;
        jumpToHistoryPage();
    }
    else if (theEvent.keyCode == keyCodeEsc)
        this.value = this.initValue;
    else
        this.changed = false;
    
    return true;
}

function addOption(text)
{
    var o = document.createElement('option');
    o.appendChild(document.createTextNode(text));
    return o;
}

function showHistory()
{
    if (!historyList || !historyList.length)
        return;

    var hist = document.createElement('select');
    hist.id = 'visithistory';
    // without removing text-transform, page names are lowercased
    hist.style.textTransform = "none";
    hist.style.width = "25%";
    hist.changed = false;
    hist.onchange = jumpToHistoryPage;
    hist.onfocus = historyFocus;
    hist.onkeydown = historyKeydown;
    hist.onclick = historyClicked;

    var o = addOption(historyList[0]);
    o.selected = true;
    hist.appendChild(o);

    for (var i = 1; i < historyList.length; i++)
    {
        hist.appendChild(addOption(historyList[i]));
    }

    var f = document.createElement('form');
    f.appendChild(hist);
    var li = document.createElement('li');
    li.appendChild(f);

    var personal = document.getElementById('p-personal').getElementsByTagName('ul')[0];
    personal.appendChild(li);

    document.getElementById('p-personal').style.zIndex = 1;
    document.getElementById('p-cactions').style.zIndex = 2;

}

function initVisitHistory()
{
    loadSaveHistory();
    showHistory();
}

// </pre>