User:Colin Hill/monobook.js

// BetterHistory v0.6

// Copyright (c) 2005 by Colin Hill (colin@colinhill.us)

// This is 100% free code. Use it for anything.

// Arrays to hold revision info

oldids=new Array(100);

revisions=new Array(100);

var title="Error";

var offset=0;

// Object that will soon be the slider button

var handleImg;

// Diff status (determines which pages to request)

// 0 Current revision html

// 1 Diff w/ most recent revision

// 2 Diff w/ previous revision

// 3 Raw wikicode (doesn't work in Opera yet)

var diffStatus = 0;

/* Updates diff status */

function ChangeDiffStatus(newStatus)

{

if(diffStatus != newStatus){

diffStatus=newStatus;

SetArticle(currentArticle);

}

else

diffStatus=newStatus;

}

/* Returns an XMLHttpRequest object */

function CreateXMLHTTPObject(){

var object=false;

// Internet Explorer

/*@cc_on @*/

/*@if (@_jscript_version >= 5)

try{

object = new ActiveXObject("Msxml2.XMLHTTP");

} catch(e){

try{

object = new ActiveXObject("Microsoft.XMLHTTP");

} catch(e2){

object = false;

}

}

@end @*/

// Other UAs

if(!object && typeof XMLHttpRequest!='undefined'){

object = new XMLHttpRequest();

}

return object;

}

function NullPage(){

return '

This is the end.

'+

'Go forward 100 revisions.
'+

'Go back 100 revisions.'+

'

';

}

/* Extract & format revision strings from history page */

function ExtractRevisions(string)

{

// Extract revision strings

var insideTagPair=false;

var substring="";

var currentRevision = 0;

for(i=0; i

// Start of tag pair?

if(!insideTagPair){

if((""+string.charAt(i)) == "<")

if(string.substr(i, 4) == "

"){

// Skip past the starting li tag

i+=3; // strlen("

")

insideTagPair=true;

continue;

}

}

// End of tag pair?

else{

// Check for ending tag

if((""+string.charAt(i)) == "<")

if(string.substr(i, 5) == "

"){

// Append the extracted revision to the array

revisions[currentRevision] = substring;

currentRevision++;

substring="";

insideTagPair=false;

continue;

}

}

// Append current char?

if(insideTagPair)

substring+=string.charAt(i);

}

// Remove all the radio buttons from the strings

for(x=0; x<100; x++){

var blanking=false;

var temp="";

currentRevision=revisions[x]

for(i=0; i

// Not blanking?

if(!blanking){

// Start blanking?

if(currentRevision.substr(i, 7) == "

blanking=true;

// Continue not blanking

else

temp+=currentRevision.charAt(i);

}

// Blanking

else {

// Check for ending tag

if((""+currentRevision.charAt(i)) == "/")

if((""+currentRevision.charAt(i+1)) == ">"){

// Skip last char of the tag

i++;

// Stop blanking chars

blanking=false;

}

}

}

revisions[x]=temp;

}

// Extract oldids, add to array

var matches=null;

var validRevision = new RegExp("oldid=([0-9]+)");

for(i=0; i<100; i++)

if(matches = validRevision.exec(revisions[i]))

oldids[i]=matches[1];

}

/* Extracts articles from surrounding html */

function ExtractArticle(string)

{

var firstChar = string.indexOf("");

var lastChar = string.indexOf("");

return string.substring(firstChar, lastChar);

}

var currentArticle;

/* Download & show an article */

function SetArticle(oldidIndex)

{

currentArticle=oldidIndex;

var xmlhttp = CreateXMLHTTPObject();

document.getElementById("articleHTML").innerHTML="

Loading...";

// Diff w/ most recent revision

if(diffStatus == 1)

xmlhttp.open("GET", "http://en.wikipedia.org/w/index.php?title="+title+"&diff=0&oldid="+oldids[oldidIndex], true);

// Diff w/ previous revision

else if((diffStatus == 2) && oldids[oldidIndex] && oldids[oldidIndex+1])

xmlhttp.open("GET", "http://en.wikipedia.org/w/index.php?title="+title+"&diff="+oldids[oldidIndex]+"&oldid="+oldids[oldidIndex+1], true);

// This revision's wikicode

else if(diffStatus == 3)

xmlhttp.open("GET", "http://en.wikipedia.org/w/index.php?title="+title+"&oldid="+oldids[oldidIndex]+"&action=raw", true);

// Selected revision

else

xmlhttp.open("GET", "http://en.wikipedia.org/w/index.php?title="+title+"&oldid="+oldids[oldidIndex], true);

// Function to handle results

xmlhttp.onreadystatechange=function() {

if (xmlhttp.readyState==4){

// Show raw if viewing wikicode

if(diffStatus != 3)

document.getElementById("articleHTML").innerHTML=ExtractArticle(xmlhttp.responseText);

else

document.getElementById("articleHTML").innerHTML="

"+xmlhttp.responseText+"

";

// Page resizes when new article loads. Snap onto notch again.

Snap(true);

}

}

// Send request

xmlhttp.send(null);

}

// Keeps track of the mouse button's status

var mousedown=false;

/* Returns the x coordinate of a specific notch */

function NotchCoord(notch){

return 6*notch;

}

/* Returns the number of the nearest slider notch */

function NearestNotch(x){

return Math.round(x/6.0);

}

// Current x pos on the track

currentX = NotchCoord(100);

/* Snaps slider button onto the nearest notch */

function Snap(butDontLoad){

// Get X position of the track

var object=document.getElementById("track");

var trackPos = 0;

while (object.offsetParent){

trackPos += object.offsetLeft

object = object.offsetParent;

}

// Snap to the nearest notch

handleImg.style.left=""+(trackPos+NotchCoord(NearestNotch(currentX))-(12/2))+"px";

// Update the currentX position

currentX=NotchCoord(NearestNotch(currentX));

// Null page

if(NearestNotch(currentX) == 0)

document.getElementById("articleHTML").innerHTML=NullPage();

// Older revision

else

if(!butDontLoad) SetArticle(100-NearestNotch(currentX));

}

/* Moves the slider button to a new position */

function Slideto(x)

{

// If the the mouse isn't dragging the button, return.

if(!mousedown)

return;

// Get X position of the track

var object=document.getElementById("track");

var trackPos = 0;

while (object.offsetParent){

trackPos += object.offsetLeft

object = object.offsetParent;

}

// Too far to the left?

if(x

currentX=0;

handleImg.style.left=""+(trackPos-6)+"px"; // on the mouse pointer

}

// Too far to the right?

else if(x>(trackPos+600)){

currentX=600;

handleImg.style.left=""+(trackPos+600-6)+"px";

}

else{

currentX=x-trackPos;

handleImg.style.left=""+(x-7)+"px";

}

// Show the current revision string

if(NearestNotch(currentX) != 0)

document.getElementById('link').innerHTML = revisions[100-NearestNotch(currentX)];

else

document.getElementById('link').innerHTML = "Change offset?";

}

/* Handles all mouse movement */

function onmousemove_Handler(event){

// Firefox

if(event)

Slideto(event.clientX);

// Internet Explorer & Opera

else

Slideto(window.event.clientX);

}

document.onmousemove=onmousemove_Handler;

/* Handles mouseup events */

function onmouseup_Handler(){

if(mousedown)

Snap(false);

mousedown=false;

}

document.onmouseup=onmouseup_Handler;

function onmousedown_Handler(e){

var focusObject = !document.all ? e.target : event.srcElement;

var topElement = !document.all ? "HTML" : "BODY";

if (focusObject.id=="handleImg"){

mousedown = true;

return false;

}

}

document.onmousedown=onmousedown_Handler;

/* Takes over the page if URL is for certain pages */

function CheckPage(){

// Put a link on the normal history page

var validHistoryURL = new RegExp(".+action=history.*");

if(validHistoryURL.exec(location.href)){

// What article?

var matches;

var titleExp = new RegExp("title=([^&]+)");

if(matches = titleExp.exec(location.href))

title = matches[1];

// Offset?

var matches;

var offsetExp = new RegExp("offset=([^&]+)");

if(matches = offsetExp.exec(location.href))

offset = matches[1];

document.getElementById("contentSub").innerHTML+='  BetterHistory';

}

validHistoryURL = new RegExp(".+Special:BetterHistory.*");

if(validHistoryURL.exec(location.href)){

// What article to request?

var matches;

var titleExp = new RegExp("article=([^&]+)");

if(matches = titleExp.exec(location.href))

title = matches[1];

// Offset?

var matches;

var offsetExp = new RegExp("offset=([^&]+)");

if(matches = offsetExp.exec(location.href))

offset = matches[1];

// Set window title

document.title=title+" - BetterHistory - Wikipedia, the free encyclopedia"

// Update weird little tab thingie

document.getElementById("ca-article").innerHTML="BetterHistory";

document.getElementById("content").style.position="relative";

document.getElementById("content").innerHTML =

// Start of new body content

''+

'

'+ ' This revision Diff w/ most recent Diff w/ previous Raw wikicode '+ '

'+

''+

'

Downloading...

'+

''+

'

'+

''+

'

'+

''+

'

';

// End of body content

}

// Get X position of the track

var object=document.getElementById("track");

var xPos=0;

var yPos=0;

while (object.offsetParent){

xPos += object.offsetLeft

yPos += object.offsetTop

object = object.offsetParent;

}

// Create the slider button

handleImg=document.createElement('img');

handleImg.style.position="absolute";

handleImg.id="handleImg";

handleImg.style.left=""+(594+xPos)+"px";

handleImg.style.top=""+(6+yPos)+"px";

handleImg.style.zIndex="10000";

handleImg.setAttribute("src", "http://gladstone.uoregon.edu/~chill1/betterhistory/slider_button.gif");

handleImg.ondragstart=function(){window.event.returnValue = false;}

document.body.appendChild(handleImg);

// Create XMLHttpRequest object

var xmlhttp = CreateXMLHTTPObject();

document.getElementById("articleHTML").innerHTML="

Loading...";

// Make request for history page

xmlhttp.open("GET", "http://en.wikipedia.org/w/index.php?title="+title+"&action=history&limit=100&offset="+offset);

// Function to handle results

xmlhttp.onreadystatechange=function() {

if (xmlhttp.readyState==4){

ExtractRevisions(xmlhttp.responseText);

document.getElementById('link').innerHTML = revisions[0];

// Set article to current revision

SetArticle(0);

}

}

// Send request

xmlhttp.send(null);

}

window.onload=CheckPage;