File: tagcloud.js

/*
* Tag Cloud JS-library
*
* @package Tag Cloud
* @author $Author: sheiko $  
* @version $Id: tagcloud.js, v 1.0 sheiko Exp $ 
* @since v.1.0 
* @copyright (c) Dmitry Sheiko http://www.cmsdevelopment.com 
*/  

var TagCloudContent = '';

/**
 * Output new content into the cloud
 */	
var showList = function(obj) { 
		var respondStructure = eval( '(' + obj.responseText + ')' ); 
		if(TagCloudContent == '') TagCloudContent = document.getElementById('TagCloud').innerHTML;	
		document.getElementById('TagCloud').innerHTML = respondStructure.content;
};  
/**
 * Show global message about process results
 */	
var ShowResultMessage = function(obj) { 
		var respondStructure = eval( '(' + obj.responseText + ')' ); 
		document.getElementById('GlobalMessageContent').innerHTML = respondStructure.content;
		window.setTimeout('GlobalMessage.style.display = "none";', 1800); 
};  
/**
 * Show message about RSs importing results and reload interface
 */	
var RedirectAndShowResultMessage= function(obj) { 
		var respondStructure = eval( '(' + obj.responseText + ')' ); 
		document.getElementById('GlobalMessageContent').innerHTML = respondStructure.content;
		window.setTimeout('GlobalMessage.style.display = "none"; document.location.href="admin.php";', 2100); 
};  

/**
 * Controller of authorization
 */	
var AuthorizationController = function(obj) { 
		var respondStructure = eval( '(' + obj.responseText + ')' ); 
		if(respondStructure.errorcode==0) {
			document.location.href = "admin.php";
		}
		document.getElementById('GlobalMessageContent').innerHTML = respondStructure.content;
		window.setTimeout('GlobalMessage.style.display = "none";', 1800); 
};  

/**
 * Get limited list of tag's records
 *
 * @param string tag
 * @param integer offset
 */	
function getList(tag, offset) {
	serverRequest("showcloud.php", "action=browsetag&tag="+tag+"&offset="+offset, showList);
	return false;
}
/**
 * Prepare global message window (justifying)
 *
 * @param string message
 */	
function initGlobalMessageWindow(message) {
		var GlobalMessage = document.getElementById('GlobalMessage');
		if (window.innerHeight) windowHeight2=window.innerHeight/2;
			else windowHeight2=window.document.body.offsetHeight/2;
		if (window.innerWidth) windowWidth2=window.innerWidth/2;
			else windowWidth2=window.document.body.offsetWidth/2;
		GlobalMessage.style.top = document.body.scrollTop+windowHeight2-GlobalMessage.clientHeight/2;
		GlobalMessage.style.left = document.body.scrollLeft+windowWidth2-GlobalMessage.clientWidth/2-50;		
		if(GlobalMessage.style.top=="0px") GlobalMessage.style.top="158px";
		document.getElementById('GlobalMessageContent').innerHTML = message;
		GlobalMessage.style.display = "block";	
}

/**
 * Return main tag cloud menu
 */	
function ReturnTagCloud() {
	document.getElementById('TagCloud').innerHTML = TagCloudContent;
	return false;
}

/**
 * Create request object
 */	
function createRequestObject() {
    var request = null;
    if(!request) try {
        request=new ActiveXObject('Msxml2.XMLHTTP');
    } catch (e){}
    if(!request) try {
        request=new ActiveXObject('Microsoft.XMLHTTP');
    } catch (e){}
    if(!request) try {
        request=new XMLHttpRequest();
    } catch (e){}
    return request;
}  


/**
 * Apply server request
 *
 * @param string link - request address
 * @param string data - parameters
 * @param string callback - (facultative) a callback-function
 */	
function serverRequest(url, data, callback) {
    var request = createRequestObject();
    if(!request) return false;
    request.onreadystatechange  = function() { 
            if(request.readyState == 4 && callback) callback(request);
    };
    if (data.length != undefined){
		request.open('POST', url, true);
    	request.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
		request.setRequestHeader("Content-Length",data.length);
	} else {
		
		request.open('GET', url, true);
		data='';
	}
	try {
		request.send(data);
	} catch (e){
		alert('The server does not respond');
	}
    return true;
}