slidePresenter Code

/*
    This file is part of slidePresenter: real-time slideshow presentations via web browser

    Copyright (C) 2006  Allen Shaw

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    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.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

    $Id$
*/


var requestIncrement = 0;

function makeRequest(args, raw, rawErrorMsg) {
    var http_request = false;
    if (window.XMLHttpRequest) { // Mozilla, Safari,...
        http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType) {
            http_request.overrideMimeType('text/xml');
        }
    } else if (window.ActiveXObject) { // IE
        try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
            http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
        }
    }
    if (!http_request) {
        alert('Giving up :( Cannot create an XMLHTTP instance');
    }

    http_request.onreadystatechange = function() { processResponse(http_request, raw, rawErrorMsg); };
    if (raw) {
        http_request.open('GET', args, true);
    } else {
        http_request.open('GET', 'index.php?service=1&' + random + requestIncrement + '=&' + args, true);
    }

    http_request.send(null);
    requestIncrement = requestIncrement + 1;
}

function processResponse(http_request, raw, rawErrorMsg) {
    if (http_request.readyState == 4) {
        if (http_request.status == 200) {
        var response = $.parseJSON(http_request.responseText, true);
            if (response['error']) {
                alert(response['error'])
            } else if (response['nofunction'] == true) {
                return;
            } else if (!response['function']) {
                alert ('No handling function dictated in response[\'function\']. Try setting $response[\'nofunction\']=true; Response:'+ http_request.resposeText)
            } else {
                window[response['function']](response);
            }
        } else {
            if (raw) {
                if (confirm('Error. A new window will open with more details on the error. Is this okay?')) {
                    var winRef = window.open('','Error','width=400,height=500,scrollbars=yes,location=no,directories=no,status=no,menubar=no');
                    winRef.document.documentElement.innerHTML = rawErrorMsg + http_request.responseText;
                }
            } else {
                alert('There was a problem with the request.' + http_request.status + ';'+ http_request.responseText);
            }
        }
    }
}