/**
 * Zikula Application Framework
 *
 * @copyright (c) 2001, Zikula Development Team
 * @link http://www.zikula.com
 * @version $Id: pnajax.js 24339 2008-06-05 18:06:52Z markwest $
 * @license GNU/GPL - http://www.gnu.org/copyleft/gpl.html
 * @package Zikula_Core
 * @subpackage Javascript
*/

/**
 * pndejsonize
 * unserializes an array
 *
 *@param jsondata JSONized array in utf-8 (as created by AjaxUtil::output
 *@return array
 */
function pndejsonize(jsondata)
{
    var result;
    try {
        result = eval('(' + jsondata + ')');
    } catch(error) {
        alert('illegal JSON response: \n' + error + 'in\n' + jsondata);
    }
    return result;
}

/**
 * pnshowajaxerror
 * shows an error message with alert()
 *
 * todo: beautify this
 *
 *@param errortext the text to show
 *@return void
 *
 */
function pnshowajaxerror(errortext)
{
    alert(errortext); 
    return;
}

/**
 * pnsetselectoption
 * sets a select to a given value
 *
 *@param id select id or object
 *@param sel the value that should be selected 
 *@return void
 *
 */
function pnsetselectoption(id, sel)
{
    $A($(id).options).each(function(opt){ opt.selected = (opt.value == sel);});
}

/**
 * pngetcheckboxvalue
 * gets the value of a checkbox depending on the state
 *
 *@param id checkbox id or object
 *@return string
 *
 */
function pngetcheckboxvalue(id)
{
    try {
        if($(id)) {
            if($(id).checked==true) {
                return $(id).value;
            }
            return '';
        }
    } catch(error) {
        alert("pngetcheckboxvalue: unknown checkbox '" + id +"'");
    }
}

/** 
 * pnupdateauthids
 * updates all hidden authid fields with a new authid obtained with an ajax call
 *
 *@param authid the new authid
 *@return void
 *
 */
function pnupdateauthids(authid)
{
    if(authid.length != 0) {
        for(var i=0; i<document.forms.length; i++) {
            for(var j=0; j<document.forms[i].elements.length; j++) {
                if(document.forms[i].elements[j].type=='hidden' && document.forms[i].elements[j].name=='authid') {
                    document.forms[i].elements[j].value = authid;
                }
            }
        }
    }
    return;
}

/** 
 * Ajax timeout detection. We set the time out to 5 seconds
 * taken from http://codejanitor.com/wp/2006/03/23/ajax-timeouts-with-prototype/
 *
 *@param none
 *@return void
 *
 */
function callInProgress(xmlhttp) {
    switch (xmlhttp.readyState) {
        case 1: 
        case 2: 
        case 3:
            return true;
            break;
        // Case 4 and 0
        default:
            return false;
            break;
    }
}

// Register global responders that will occur on all AJAX requests
Ajax.Responders.register({
    onCreate: function(request) {
        if($('ajax_indicator')) {
            Element.show('ajax_indicator');
        }
        request['timeoutId'] = window.setTimeout(
            function() {
                // If we have hit the timeout and the AJAX request is active, abort it and let the user know
                if (callInProgress(request.transport)) {
                    request.transport.abort();                           
                    if($('ajax_indicator') && $('ajax_indicator').tagName == 'IMG') {
                        $('ajax_indicator').src = document.baseURI + 'images/icons/extrasmall/error.gif';
                    }
                    pnshowajaxerror('Ajax connection time out!');
                    // Run the onFailure method if we set one up when creating the AJAX object
                    if (request.options['onFailure']) {
                        request.options['onFailure'](request.transport, request.json);
                    }
                }
            },
            5000 // Five seconds - change your timeout here if needed!!
        );
    },
    onComplete: function(request) {
        if($('ajax_indicator')) {
            Element.hide('ajax_indicator');
        }
        // Clear the timeout, the request completed ok
        window.clearTimeout(request['timeoutId']);
    }
});


/**
 * recolor
 * set pn-odd / pn-even on each li after append, move and delete
 *
 *@params  string listclass class applied to the list of items
 *@params  string headerclass class applied to the header of the list
 *@returns none;
 *@author  Frank Schummertz
 */
function pnrecolor(listclass, headerclass )
{
    var pnodd = true;
    
    $A($(listclass).childNodes).each(
        function(node)
        {
            if(Element.hasClassName(node, headerclass)) {
            } else {
                Element.removeClassName(node, 'pn-odd');
                Element.removeClassName(node, 'pn-even');

                if(pnodd == true) {
                    Element.addClassName(node, 'pn-odd');
                } else {
                    Element.addClassName(node, 'pn-even');
                }
                pnodd = !pnodd;
            }
        }
        );
}

/**
 * switchdisplaystate
 * change the display attribute of an specific object
 *
 * @params  string id of the object to hide/show
 * @returns none;
 * @author  Axel Guckelsberger
 * @author  Mateo Tibaquira
 */
function switchdisplaystate(id)
{
    var pntmpobj = $(id);

    if (pntmpobj.getStyle('display') == 'none') {
        if(typeof(Effect) != "undefined") {
            Effect.BlindDown(pntmpobj);
        } else {
            pntmpobj.show();
        }
    } else {
        if(typeof(Effect) != "undefined") {
            Effect.BlindUp(pntmpobj);
        } else {
            pntmpobj.hide();
        }
    }
}