main.js

/**
 * Copyright (C) 2012  Brien Coffield, coffbr01@gmail.com
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details:
 * <http://www.gnu.org/licenses/gpl-3.0.html>.
 */

/**
 * Converts xml DOM to json.
 * Note: no attributes are converted.
 * Result will contain only nodeNames and node.data where applicable.
 * Also skips all whitespace.
 */
xmlToJson = function(xml, json) {
    if (json === undefined) {
        // Should only happen on the first call.
        json = {};
    }

    if (typeof(xml) === "string") {
        // Typically you want to pass xml that has already been parsed.
        // From an xmlhttpresponse, use xmlhttpresponse.responseXML instead
        // of responseText to skip this branch.
        xml = (new DOMParser()).parseFromString(xml, "text/xml");
    }

    var i = 0;
    for (; i < xml.childNodes.length; i++) {
        var childNode = xml.childNodes[i];
        if (childNode.data !== undefined) {
            if (childNode.data.trim() !== "") {
                json.data = childNode.data;
            }
            continue;
        }

        var dataStructure = {};
        if (json[childNode.nodeName] === undefined) {
            // Node has not been seen before. Pass empty object as json.
            json[childNode.nodeName] = dataStructure;
        }
        else if (json[childNode.nodeName].length === undefined) {
            // Node has been seen once before. Convert to array.
            var old = json[childNode.nodeName];
            json[childNode.nodeName] = [];
            json[childNode.nodeName].push(old);
            json[childNode.nodeName].push(dataStructure);
        }
        else {
            // Node has been seen at least twice now. Just push new object to array.
            json[childNode.nodeName].push(dataStructure);
        }

        // Mutate json recursively.
        xmlToJson(childNode, dataStructure);
    }

    // All mutations finished, return result.
    return json;
};

fakeData = function() {
    var xml = "<root>";
    xml += "<events>";
    xml += "<event>";
    xml += "event1";
    xml += "</event>";
    xml += "<event>";
    xml += "event2";
    xml += "</event>";
    xml += "</events>";
    xml += "</root>";
    return xml;
};

console.log(xmlToJson(fakeData()));