How to get JavaScript caller function line number and caller source URL

I am using the following for getting the JavaScript caller function name:

var callerFunc = arguments.callee.caller.toString();
callerFuncName = (callerFunc.substring(callerFunc.indexOf("function") + 8, callerFunc.indexOf("(")) || "anoynmous")

Is there a way to discover the line number from which the method was called?

Also, is there a way to get the name of the JavaScript file the method was called from? Or the source URL?

Solution 1:

This works for me in chrome/QtWebView

function getErrorObject(){
    try { throw Error('') } catch(err) { return err; }
}

var err = getErrorObject();
var caller_line = err.stack.split("\n")[4];
var index = caller_line.indexOf("at ");
var clean = caller_line.slice(index+2, caller_line.length);

Solution 2:

kangax's solution introduces unnecessary try..catch scope. If you need to access the line number of something in JavaScript (as long as you are using Firefox or Opera), just access (new Error).lineNumber.

Solution 3:

I was surprised that most of these answers assumed that you wanted to handle an error rather than just output helpful debug traces for normal cases as well.

For example, I like using a console.log wrapper like this:

consoleLog = function(msg) {//See https://stackoverflow.com/a/27074218/470749
    var e = new Error();
    if (!e.stack) {
        try {
            // IE requires the Error to actually be thrown or else the 
            // Error's 'stack' property is undefined.
            throw e;
        } catch (e) {
            if (!e.stack) {
                //return 0; // IE < 10, likely
            }
        }
    }
    var stack = e.stack.toString().split(/\r\n|\n/);
    if (msg === '') {
        msg = '""';
    }
    console.log(msg, '          [' + stack[1] + ']');        
}

This ends up printing an output such as the following to my console:

1462567104174 [getAllPosts@http://me.com/helper.js:362:9]

See https://stackoverflow.com/a/27074218/ and also A proper wrapper for console.log with correct line number?

Solution 4:

I realize this is an old question but there is now a method called console.trace("Message") that will show you the line number and the chain of method calls that led to the log along with the message you pass it. More info on javascript logging tricks are available here at freecodecamp and this medium blog post