Sync douban to goodreads

syncDoubanToGoodreads.js

isReading = false;
isWishing = false;
isRead = false;
xmlHttp = new XMLHttpRequest(); 
trySyncGoodReads();

state = document.getElementsByClassName("mr10")[0];

if (state == undefined)
{
	// not marked
    return;
}

info = document.getElementById("info");
isbn = info.lastElementChild.previousSibling;
isbn = isbn.data.substr(1);

isReading = state.innerText == "我最近在读这本书";
isWishing = state.innerText == "我想读这本书";
isRead = state.innerText == "我读过这本书";

url = "http://www.goodreads.com/book/isbn_to_id/"+ isbn + "?key=[GOODREADS_APIKEY]";
xmlHttp.onreadystatechange = ProcessRequest;
xmlHttp.open( "GET", url, true );
xmlHttp.send( null );

function ProcessRequest() 
{
    if ( xmlHttp.readyState == 4 && xmlHttp.status == 200 ) 
    {
        if ( xmlHttp.responseText != "No book with that ISBN" ) 
        {
        	shelfName = null
        	if (isReading)
        		shelfName = "currently-reading";
        	if (isWishing)
        		shelfName = "to-read";
        	if (isRead)
        		shelfName = "read";

			bookId = xmlHttp.responseText;	
        	url = "http://www.goodreads.com/shelf/add_to_shelf.xml?name=" + shelfName + "&book_id=" + bookId        	
		    xmlHttp.onreadystatechange = Result;
		    xmlHttp.open( "GET", url, true );
		    xmlHttp.send( null );
        } else 
        {
        	state.innerText += " ( Not found in goodreads )"
        }
    }
}

function Result()
{
	if ( xmlHttp.readyState == 4 && xmlHttp.status == 200 ) 
    {
    	state.innerText += " ( Synced with goodreads )"
    }
}