Some exceptions in dhtmlxTree can be captured and processed.

    function myErrorHandler(type, desc, erData){
            alert(erData[0].status)
    }
    dhtmlxError.catchError("ALL",myErrorHandler);
 

The handler gets the following parameters:

• type - supported error types (“All” or “LoadXML”);
• desc - error description (hardcoded in code);
• erData - error related array of objects ([0] - response object).