User:Joshurtree/multicat.js

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Documentation for this user script can be added at User:Joshurtree/multicat.

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//<pre><nowiki>

function PageQuery(q) {
    if (q.length > 1) 
        this.query = q.substring(1, q.length);
    else 
        this.query = null;

    this.values = new Object();

    if (q) {
         for (var i = 0; i < this.query.split("&").length; i++) {
             var pair = this.query.split("&")[i];
             this.values[pair.split("=")[0]] = pair.split("=")[1];
         }
         
    }
}

PageQuery.prototype.getValue = function(s) {
    return this.values[s];
}

PageQuery.prototype.getParameters = function() {
    return keys;
}

PageQuery.prototype.getLength = function() { 
    return this.values.length; 
}

PageQuery.create = function() {
    var retText =  prefix ? wgScriptPath + '/' + prefix + '?' : '';
 
    for (x in parameters) {
        if (parameters[x] != null)
            retText += x + '=' + parameters[x] + '&';
    }
 
    return retText.substring(0, retText.length - 1);
}

function CategoryIntersection() {
    var query = new PageQuery(location.search);
    this.category1 = wgTitle;
    this.category2 = query.getValue("intersection");
    this.from = query.getValue("from");
    this.request = sajax_init_object();
    this.request.parentObj = this;
    var query = {
        'action': 'query',
        'generator': 'categorymembers',
        'gcmtitle': this.category1,
        'gcmlimit': 500,
        'prop': 'categories',
        'clprop': 'sortkey'
    };

    this.request.open('GET', PageQuery.create(query), true);
    this.request.onload = function() { this.parentObj.handleCategoryQuery; };
    this.request.send();
}

CategoryIntersection.prototype.handleCategoryQuery = function() {
    var pages = this.request.responseXML.getElementsByTagName('page');
    XMLDocument output = 
    for (page in pages) {
        var sortkey;
        var intersection;
        var xmlDoc = loadXMLDoc();
    
        xmlDoc        
        for (category in page.firstChild.childNodes) {
            var title = category.getAttribute('title');
            if (title == this.category1)
                sortkey = category.getAttribute('sortkey');
            else if (title == this.category2)
                intersection = true;

            if (intersection) {
        }
       
                                       

function loadXMLDoc(fname)
{
    var xmlDoc;
    // code for IE
    if (window.ActiveXObject)
        xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
    // code for Mozilla, Firefox, Opera, etc.
    else if (document.implementation && document.implementation.createDocument)
        xmlDoc=document.implementation.createDocument("","",null);
    else
      alert('Your browser cannot handle this script');

    xmlDoc.async = false;
    
    if (fname)
        xmlDoc.load(fname);
    return(xmlDoc);
}

addOnLoadHook(function() {
    if (wgNamespaceNumber == 14 && location.URL.indexOf("&intersection=") > 0)
        new CategoryIntersection();
}

//</pre></nowiki>