Easily Track Javascript File and line number which has error

When all else fails, the issue may be caused by errors in your JavaScript application. A helpful way to determine this is to use the window.onerror function to track down your errors.

Easily Track Javascript File and line number which has error

window.onerror = function (err, fileName, lineNumber) {

   // alert or console.log a message

   alert(fileName, 'Line:', lineNumber, 'Error:', e.message);

};

Parameter info: 

// err: error message

// fileName: which file error occurs in

// lineNumber: what line error occurs on