Collection of Javascript functions

functions.js

function getCookieValue(key) {
    currentcookie = document.cookie;
    if (currentcookie.length > 0)
    {
        firstidx = currentcookie.indexOf(key + "=");
        if (firstidx != -1)
        {
            firstidx = firstidx + key.length + 1;
            lastidx = currentcookie.indexOf(";",firstidx);
            if (lastidx == -1)
            {
                lastidx = currentcookie.length;
            }
            return unescape(currentcookie.substring(firstidx, lastidx));
        }
    }
    return "";
}

/**
 * Set a cookie.
 *
 * @param cookieName
 * @param value
 * @param expireDays Optional. Defaults to 1 day.
 * @param path       Optional. Defaults to /
 * @returns {boolean}
 */
function setCookie(cookieName, value, expireDays, path) {
	if(typeof cookieName === 'undefined' || typeof value == 'undefined') {
		return false;
	}

	if(typeof expireDays === 'undefined') {
		expireDays = 1;
	}

	if(typeof path === 'undefined') {
		path = '/';
	}

	var cookieExpireDays = expireDays * 24 * 60 * 60 * 1000;
	var currentDate = new Date();
	var expirationDate = new Date(currentDate.getTime() + cookieExpireDays);

	document.cookie = cookieName + '=' + value + ';'
						+ 'expires=' + expirationDate.toGMTString() + ';'
						+ 'path=' + path;

	return true;
}


/**
 * Opens a popup in the center of the screen
 *
 * @param url
 * @param title
 * @param width
 * @param height
 * @returns {window}
 */
function openPopupCenter(url, title, width, height) {
	var top  = (screen.height/2)-(height/2);
	var left = (screen.width/2)-(width/2);

	return window.open(
		url, title,
		'width='+width+',height='+height+',top='+top+',left='+left+',resizable=yes'
	);
}


function nl2br (str, is_xhtml) {
    var breakTag = (is_xhtml || typeof is_xhtml === 'undefined') ? '<br />' : '<br>';
    return (str + '').replace(/([^>\r\n]?)(\r\n|\n\r|\r|\n)/g, '$1' + breakTag + '$2');
}

/**
 * Get back a GET parameter, properly decoded. Or null if not found.
 *
 * @param string name
 * @returns string|null
 */
function getURLParameter(name) {
    return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)').exec(location.search)||[,""])[1].replace(/\+/g, '%20'))||null;
}

/**
 * Return a random value from the given non-associative array
 *
 * @param array
 * @returns {*}
 */
function getRandomArrayValue(array) {
	return array[Math.floor(Math.random() * array.length)];
}

/**
 * Send data to the given URL via a POST request. Or GET if specified.
 *
 * @param string path
 * @param object params
 * @param string method
 */
function postToURL(path, params, method) {
    method = method || "post"; // Set method to post by default if not specified.

    // The rest of this code assumes you are not using a library.
    // It can be made less wordy if you use one.
    var form = document.createElement("form");
    form.setAttribute("method", method);
    form.setAttribute("action", path);

    for(var key in params) {
        if(params.hasOwnProperty(key)) {
            var hiddenField = document.createElement("input");
            hiddenField.setAttribute("type", "hidden");
            hiddenField.setAttribute("name", key);
            hiddenField.setAttribute("value", params[key]);

            form.appendChild(hiddenField);
         }
    }

    document.body.appendChild(form);
    form.submit();
}


// ----------------------------------------------------------
// If you're not in IE (or IE version is less than 5) then:
// ie === undefined
// If you're in IE (>=5) then you can determine which version:
// ie === 7; // IE7
// Thus, to detect IE:
// if (ie) {}
// And to detect the version:
// ie === 6 // IE6
// ie > 7 // IE8, IE9, IE10 ...
// ie < 9 // Anything less than IE9
// ----------------------------------------------------------
var ie = (function(){
    var undef,rv = -1; // Return value assumes failure.
    if (navigator.appName == 'Microsoft Internet Explorer')
    {
        var ua = navigator.userAgent;
        var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
        if (re.exec(ua) != null)
            rv = parseFloat( RegExp.$1 );
    }

    return ((rv > -1) ? rv : undef);
}());