Handling PhantomJS errors

PhantomJS scripts are not compiled, so we do expect that both runtime- and syntax-related errors could be thrown during script execution. These types of errors can be handled using the phantom object's onError callback.

If PhantomJS encounters a syntax error in the script, it will call the function defined for this callback; if there is no function defined for this callback, it will perform the default implementation and output the errors in the console as shown in the following screenshot:

PhantomJS will display the error message followed by a series of lines, which denotes the stack of the error call. It will also display the function or method with a source line number.

This information is also passed to any function that we've defined for the onError callback. The onError callback definition is as follows:

phantom.onError = function(msg, trace) {
  // code handling 
};

The onError callback will accept two parameters as shown in the preceding code. The...