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How can I set up number of characters to start loading data from server?

Hi!

How can I set up number of characters to start loading data from server i.e. when user types 2nd (3d) char data from server will be filtered and loaded?

You can be done by modification in the dhtmlxcombo.js _fetchOptions method:

dhtmlXCombo.prototype._fetchOptions=function(ind,text){
if(text.length < 2) return; /*added line - where 2 is number of character when the loading starts*/
          if (text=="") { this.closeAll();  return this.clearAll();   }
         var url=this._xml+((this._xml.indexOf("?")!=-1)?"&":"?")+"pos="+ind+"&mask="+encodeURIComponent(text);
         this._lasttext=text;
         if (this._load) this._load=url;
         else this.loadXML(url);
    }