User:Scott.wheeler/relatedarticles.js

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Documentation for this user script can be added at User:Scott.wheeler/relatedarticles.

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function JSONP(url)
{
    this.url = url; 
    this.headTag = document.getElementsByTagName("head").item(0);
    this.scriptId = 'JscriptId' + JSONP.scriptCounter++;
}

JSONP.scriptCounter = 1;

JSONP.prototype.buildScriptTag = function ()
{
    this.script = document.createElement("script");
    this.script.setAttribute("type", "text/javascript");
    this.script.setAttribute("charset", "utf-8");
    this.script.setAttribute("src", this.url);
    this.script.setAttribute("id", this.scriptId);
}
 
JSONP.prototype.removeScriptTag = function ()
{
    this.headTag.removeChild(this.script);  
}

JSONP.prototype.addScriptTag = function ()
{
    this.headTag.appendChild(this.script);
}

var RelatedArticles =
{
    titles: null
}

RelatedArticles.fetch = function()
{
    if(mw.config.get('wgPageName').indexOf(":") >= 0 || mw.config.get('wgPageName') == "Main_Page")
    {
        return;
    }

    var url = "http://pedia.directededge.com/api.fcgi" +
   	      "?format=json&jsonp=RelatedArticles.callback&topic=" + encodeURI(mw.config.get('wgPageName'));

    var request = new JSONP(url);

    request.buildScriptTag();
    request.addScriptTag();
}

RelatedArticles.callback = function(titles)
{
    RelatedArticles.titles = titles;

    if(window.addEventListener)
    {
	window.addEventListener("load", RelatedArticles.insert, false);
    }
    else if(window.attachEvent)
    {
	window.attachEvent("onload", RelatedArticles.insert);
    }
    else
    {
	throw "No event to attach to.";
    }
}

RelatedArticles.insert = function()
{
    var column = document.getElementById("column-one");
    var search = document.getElementById("p-search");

    if(!column || !search)
    {
	throw "Could not find column and search elements.";
    }

    var related = document.createElement("div");
    related.setAttribute("class", "portlet");
    column.insertBefore(related, search);

    var label = document.createElement("h5");
    label.appendChild(document.createTextNode("related articles"));
    related.appendChild(label);

    var pBody = document.createElement("div");
    pBody.setAttribute("class", "pBody");
    related.appendChild(pBody);

    var list = document.createElement("ul");
    pBody.appendChild(list);

    var prefix = "http://en.wikipedia.org/wiki/";

    for(var i = 0; i < RelatedArticles.titles.length; i++)
    {
	var li = document.createElement("li");
	list.appendChild(li);

	var link = document.createElement("a");
	li.appendChild(link);

	link.setAttribute("href", prefix + escape(RelatedArticles.titles[i]));
	link.appendChild(document.createTextNode(RelatedArticles.titles[i]));
    }
}

RelatedArticles.fetch();