var editor;
var httpRequest;

// --- costruttore della classe H_editor ---
function H_editor (id, level) {
   // --- Inizializza le proprietà
   this.status = false;
   this.id = id;
   this.level = level;
   this.docId = 'h_edi_'+id;
   this.code = '';

   // --- Inizializza i metodi ---
   this.edit = editArea;
   this.save = saveArea;
}

// --- metodi della classe H_editor ---
function editArea(style){
   if(this.status) return;

// Recupero via Ajax del block-code originale
   editor = this;
   getCode('POST','?','h_getcode='+this.id+'&h_level='+this.level);

// Costruzione della TEXTAREA per l'edit del block-code
   var text = '<textarea id="'+this.docId+'_txtarea" onBlur="eval(\''+this.docId+'.save()\');" wrap="off" style="'+style+'">';
   text += this.code;
   text += '</textarea>';
   text += '<br/>';
   text += '<div class="edit_area"><input type="button" onClick="eval(\''+this.docId+'.save()\');" value="modifica" class="button"/></div>';
  
// Scrittura della TEXTAREA
   document.getElementById(this.docId).innerHTML = text;

// Attivazione dello stato 'IN EDIT'
   this.status = true;
}

function saveArea(){
   if(!this.status) return;
   var content="";
   if (document.all) content = document.getElementById(this.docId+'_txtarea').innerHTML;
   else content = document.getElementById(this.docId+'_txtarea').value;
   if (document.all) document.getElementById(this.docId).innerHTML = content;
   else document.getElementById(this.docId).value= content;
   editor = this;
   pars = 'h_setcode='+this.id+'&h_level='+this.level+'&h_bodycode='+escape(content);

   send('POST', '?', true, pars); // Richiesta Ajax ASINCRONA
}
// FINE metodi della classe 'H_editor'


// Metodo CALLBACK request AJAX
function setCode() {
   if(httpRequest.readyState == 4 && httpRequest.status == 200) {
         var text = unescape(httpRequest.responseText);
         editor.code = text;
   }
}

// Metodo CALLBACK request AJAX
function displayArea() {
   if(httpRequest.readyState == 4 && httpRequest.status == 200) {
         var text = unescape(httpRequest.responseText);
         document.getElementById(editor.docId).innerHTML = text;
         editor.status = false;
   }
}

// metodo di LANCIO request AJAX
function getCode(mode, url, pars) {
      httpRequest = new XMLHttpRequest();

      httpRequest.onreadystatechange=setCode;
      httpRequest.open(mode,url,false)
      httpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
      httpRequest.send(pars)
}

// metodo di LANCIO request AJAX
function send(mode, url, flag, pars) {
      httpRequest = new XMLHttpRequest();

      httpRequest.onreadystatechange=displayArea
      httpRequest.open(mode,url,flag)
      httpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
      httpRequest.send(pars)
}

function writetostatus(text){
    window.status = text;
    return true;
}