// version: 2017-11-25
    /**
    * o--------------------------------------------------------------------------------o
    * | This file is part of the RGraph package - you can learn more at:               |
    * |                                                                                |
    * |                          http://www.rgraph.net                                 |
    * |                                                                                |
    * | RGraph is licensed under the Open Source MIT license. That means that it's     |
    * | totally free to use and there are no restrictions on what you can do with it!  |
    * o--------------------------------------------------------------------------------o
    */
    RGraph          = window.RGraph || {isRGraph: true,isRGraphSVG: true};
    RGraph.SVG      = RGraph.SVG || {};
    RGraph.SVG.AJAX = RGraph.SVG.AJAX || {};
// Module pattern
(function (win, doc, undefined)
{
    var RG  = RGraph,
        ua  = navigator.userAgent,
        ma  = Math;
    /**
    * Makes an AJAX call. It calls the given callback (a function) when ready
    * 
    * @param string   url      The URL to retrieve
    * @param function callback A function that is called when the response is ready, there's an example below
    *                          called "myCallback".
    */
    RG.SVG.AJAX = function (url, callback)
    {
        // Mozilla, Safari, ...
        if (window.XMLHttpRequest) {
            var httpRequest = new XMLHttpRequest();
        // MSIE
        } else if (window.ActiveXObject) {
            var httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
        }
        httpRequest.onreadystatechange = function ()
        {
            if (this.readyState == 4 && this.status == 200) {
                this.__user_callback__ = callback;
                this.__user_callback__(this.responseText);
            }
        }
        httpRequest.open('GET', url, true);
        httpRequest.send();
    };
    /**
    * Makes an AJAX POST request. It calls the given callback (a function) when ready
    * 
    * @param string   url      The URL to retrieve
    * @param object   data     The POST data
    * @param function callback A function that is called when the response is ready, there's an example below
    *                          called "myCallback".
    */
    RG.SVG.AJAX.POST = function (url, data, callback)
    {
        // Used when building the POST string
        var crumbs = [];
        // Mozilla, Safari, ...
        if (window.XMLHttpRequest) {
            var httpRequest = new XMLHttpRequest();
        // MSIE
        } else if (window.ActiveXObject) {
            var httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
        }
        httpRequest.onreadystatechange = function ()
        {
            if (this.readyState == 4 && this.status == 200) {
                this.__user_callback__ = callback;
                this.__user_callback__(this.responseText);
            }
        }
        httpRequest.open('POST', url, true);
        httpRequest.setRequestHeader("Content-type","application/x-www-form-urlencoded");
         
        for (i in data) {
            if (typeof i == 'string') {
                crumbs.push(i + '=' + encodeURIComponent(data[i]));
            }
        }
        httpRequest.send(crumbs.join('&'));
    };
    /**
    * Uses the above function but calls the call back passing a number as its argument
    * 
    * @param url string The URL to fetch
    * @param callback function Your callback function (which is passed the number as an argument)
    */
    RG.SVG.AJAX.getNumber = function (url, callback)
    {
        RG.SVG.AJAX(url, function ()
        {
            var num = parseFloat(this.responseText);
            callback(num);
        });
    };
    /**
    * Uses the above function but calls the call back passing a string as its argument
    * 
    * @param url string The URL to fetch
    * @param callback function Your callback function (which is passed the string as an argument)
    */
    RG.SVG.AJAX.getString = function (url, callback)
    {
        RG.SVG.AJAX(url, function ()
        {
            var str = String(this.responseText);
            callback(str);
        });
    };
    /**
    * Uses the above function but calls the call back passing JSON (ie a JavaScript object ) as its argument
    * 
    * @param url string The URL to fetch
    * @param callback function Your callback function (which is passed the JSON object as an argument)
    */
    RG.SVG.AJAX.getJSON = function (url, callback)
    {
        RG.SVG.AJAX(url, function ()
        {
            var json = eval('(' + this.responseText + ')');
            callback(json);
        });
    };
    /**
    * Uses the above RGraph.AJAX function but calls the call back passing an array as its argument.
    * Useful if you're retrieving CSV data
    * 
    * @param url string The URL to fetch
    * @param callback function Your callback function (which is passed the CSV/array as an argument)
    */
    RG.SVG.AJAX.getCSV = function (url, callback)
    {
        var seperator = (typeof arguments[2] === 'string'  ? arguments[2] : ','),
            lineSep   = (typeof arguments[3] === 'string' ? arguments[3] : "\r?\n");
        RG.SVG.AJAX(url, function ()
        {
            var text   = this.responseText,
                regexp = new RegExp(seperator),
                lines  = this.responseText.split(lineSep),
                rows   = [];
            for (var i=0; i<lines.length; ++i) {
                 
                var row = lines[i].split(seperator);
                 
                for (var j=0,len=row.length;j<len;++j) {
                    if (row[j].match(/^[0-9.]+$/)) {
                        row[j] = parseFloat(row[j]);
                    }
                }
     
                rows.push(row);
            }
            callback(rows);
        });
    };
// End module pattern
})(window, document);