How to get the code line number where function is called

Question

I searched a lot but could not get correct / updated answer (arguments.caller.callee does not exist it seems). I want to know the code line number where a particular function is called. I got this solution where function caller name can be retrieved .

But I am calling my function in JQuery UI droppable. For eg:

$("#id").droppable({

stop: function(e,u){

   main(); // I want this line number
}

});

Thats the reason I wanted to know the line number . Is there any way ?

i used `try{throw new error("line")}catch(e){console.log(e.stack.split(" at ")[1])}` — Mamdouh Saeed, Oct 31 '16 at 13:52
@epascarello : console.log() but where ? If I already knew where the the line of code is then only I can place console.log() over there . Function is being called at many places. — Amar Singh, Oct 31 '16 at 14:17

Gerardo Furtado · Answer 1 · 2016-10-31T14:02:31.470

1

If you use console.error(), it will show the call stack and the line numbers (at least in Chrome, when you click the small black arrow):

function foo(){
    bar();
}

function bar(){
    console.error("hello");
}

foo();

Will show:

Check this fiddle (console.error doesn't work properly in the snippet): https://jsfiddle.net/fs1qqe77/

edited Oct 31 '16 at 14:02

answered Oct 31 '16 at 13:55

Gerardo Furtado

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I think this is good for chrome . But can it be used in all browsers ? – Amar Singh Nov 01 '16 at 05:53
I'm not sure, but I think you only need it in the browser you're using for debugging, am I right? – Gerardo Furtado Nov 01 '16 at 05:56

score 0 · Answer 2 · answered Oct 31 '16 at 14:10

I have try with try catch throw

Note: snippet works inside a iframe so line wont be correctly.

var i = 2016;
i++;
var str = "Happy new year "+i;

try{
clog();throw new error("l"); 
}catch(e){
console.log("current line: "+e.stack.split(" at ")[1]);//current file and line
}


function clog(){
console.log(str);
}

How to get the code line number where function is called

2 Answers2