number Property (Error) (JavaScript)

Object

Any instance of the Error object.

errorNumber

An integer representing an error.

An error number is a 32-bit value. The upper 16-bit word is the facility code, and the lower word is the error code. To determine the error code, use the & (bitwise And) operator to combine the number property with the hexadecimal number 0xFFFF.

The following example causes an exception to be thrown and displays the error code that is derived from the error number.

try
    {
    // Cause an error.
    var x = y;
    }
catch(e)
    {
    document.write ("Error Code: ");
    document.write (e.number & 0xFFFF)
    document.write ("<br />");
    
    document.write ("Facility Code: ")
    document.write(e.number>>16 & 0x1FFF)
    document.write ("<br />");
 
    document.write ("Error Message: ")
    document.write (e.message)
    }

The output of this code is as follows.

Error Code: 5009
Facility Code: 10
Error Message: 'y' is undefined

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards. Also supported in Windows Store apps. See Version Information.

Applies To: Error Object (JavaScript)

Reference