Chrome JS debugging help... where was function called?

Question

I'm using console.log(var_name); to debug JS code in chrome and am wondering, is there a way to output to the console the line at which the current function was called?

I've just solved my bug everyone... thanks to all who replied!!! — flea whale
– flea whale, Commented Nov 30, 2011 at 16:13

pimvdb · Accepted Answer · 2011-11-30 15:43:48Z

2

You can get the stack trace with the following:

(new Error).stack;

You could then use a regular expression to filter out the line number: http://jsfiddle.net/8wA74/.

var stack = (new Error).stack.split("\n"),
    line = /:(\d+):/.exec(stack[1]); // 1 is stack depth, format is "url:line:char"

console.log("Current function was called on line " + line[1]);
// this 1 is the number of the group in regexp

answered Nov 30, 2011 at 15:43

pimvdb

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2 Comments

flea whale Over a year ago

thanks @pimvdb, this is helpful to an extent although it's actually giving me the line where (new Error) is, not the line where the function that encompasses that was called.

pimvdb Over a year ago

@Jimmy_Bob: Then you can try changing stack[1] to stack[2], which is one level deeper in the stack trace.

TJHeuvel · Accepted Answer · 2011-11-30 15:43:03Z

1

Not that i know of, but wouldnt it be possible to set a breakpoint instead? That surely has a stacktrace visible.

Just try to click the linenumber in the dev. console, it'll show a blue arrow and next time it hits it'll show you the stacktrace.

answered Nov 30, 2011 at 15:43

TJHeuvel

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1 Comment

flea whale Over a year ago

thanks for this, I'm sure breakpoints will be easier than console logging when I get the hang of them

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