/* Permet d'envoyer des données en GET ou POST en utilisant les XmlHttpRequest */
function sendData(page, data, method, idelement, scroll)
{
    if(document.all) { //Internet Explorer
        var XhrObj = new ActiveXObject("Microsoft.XMLHTTP") ;
    } else { //Mozilla
        var XhrObj = new XMLHttpRequest();
    }
    
    // Détection de la méthode à utiliser
    if(method == "POST") { //Ouverture du fichier en méthode POST
        XhrObj.open("POST", page);
	} else { // Ouverture du fichier en méthode GET
		if(data == 'null' || data == '') {
            XhrObj.open("GET", page);
		} else {
            XhrObj.open("GET", page+"?"+data);
        }
    }

    // Ok pour la page cible
    XhrObj.onreadystatechange = function() {
        if (XhrObj.readyState == 4 && XhrObj.status == 200) {
            if(idelement) {
				document.getElementById(idelement).innerHTML = XhrObj.responseText;
				if(scroll == 'scroll') document.getElementById(idelement).scrollTop = document.getElementById(idelement).scrollHeight + 40;
			}
		}
    }

    if(method == "POST") { // Envoi de la requete en POST
        XhrObj.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
        XhrObj.send(data);
    } else { // Envoi de la requete en GET
		XhrObj.send(null);
    }
}

// Envoi
function envoi_message(idelement) {
	message = document.getElementById(idelement).value;
	sendData ('/chat_exe.php', 'action=write&message=' + escape(message), 'GET');
	document.getElementById(idelement).value = '';
}

function refreshconnecteschat() { sendData('/chat_exe.php', 'action=connectes', 'GET', 'chat_connectes'); }
function refreshchat() { sendData('/chat_exe.php', 'action=read&lignes=32', 'GET', 'chat_messages', 'scroll'); }

function refreshchattop() { sendData('/chat_exe.php', 'action=read&lignes=4', 'GET', 'chat_messages_top', 'scroll'); }
function refreshconnectes() { sendData('/connectes.php', 'action=connectes', 'GET', 'barre_logo_info'); }

function URLEncode(chaine)
{
	// The Javascript escape and unescape functions do not correspond
	// with what browsers actually do...
	var SAFECHARS = "0123456789" +					// Numeric
					"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +	// Alphabetic
					"abcdefghijklmnopqrstuvwxyz" +
					"-_.!~*'()";					// RFC2396 Mark characters
	var HEX = "0123456789ABCDEF";

	var plaintext = chaine;
	var encoded = "";
	for (var i = 0; i < plaintext.length; i++ ) {
		var ch = plaintext.charAt(i);
	    if (ch == " ") {
		    encoded += "+";				// x-www-urlencoded, rather than %20
		} else if (SAFECHARS.indexOf(ch) != -1) {
		    encoded += ch;
		} else {
		    var charCode = ch.charCodeAt(0);
			if (charCode > 255) {
			    alert( "Unicode Character '" 
                        + ch 
                        + "' cannot be encoded using standard URL encoding.\n" +
				          "(URL encoding only supports 8-bit characters.)\n" +
						  "A space (+) will be substituted." );
				encoded += "+";
			} else {
				encoded += "%";
				encoded += HEX.charAt((charCode >> 4) & 0xF);
				encoded += HEX.charAt(charCode & 0xF);
			}
		}
	} // for

	return encoded;
};

function URLDecode(chaine)
{
   // Replace + with ' '
   // Replace %xx with equivalent character
   // Put [ERROR] in output if %xx is invalid.
   var HEXCHARS = "0123456789ABCDEFabcdef"; 
   var encoded = chaine;
   var plaintext = "";
   var i = 0;
   while (i < encoded.length) {
       var ch = encoded.charAt(i);
	   if (ch == "+") {
	       plaintext += " ";
		   i++;
	   } else if (ch == "%") {
			if (i < (encoded.length-2) 
					&& HEXCHARS.indexOf(encoded.charAt(i+1)) != -1 
					&& HEXCHARS.indexOf(encoded.charAt(i+2)) != -1 ) {
				plaintext += unescape( encoded.substr(i,3) );
				i += 3;
			} else {
				alert( 'Bad escape combination near ...' + encoded.substr(i) );
				plaintext += "%[ERROR]";
				i++;
			}
		} else {
		   plaintext += ch;
		   i++;
		}
	} // while
   return plaintext;
};

function postform(url,form,div) {
//alert(form);
	data = '';
	i = 0;
	//while(document.forms[0].elements[i]) {
	while(document.forms[form].elements[i]) {
//		alert(document.forms[form].elements[i].name + " : " + document.forms[form].elements[i].value)
		if(i>0) {
			data += '&';
		}
//		data += document.forms[form].elements[i].name + "=" + URLEncode(document.forms[form].elements[i].value);
		data += document.forms[form].elements[i].name + "=" + escape(document.forms[form].elements[i].value);
		i ++;
	}
	sendData(url, data, 'POST', div)
}