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up vote 3 down vote favorite
1

The title is pretty self-explanatory..

Is there a way to read whatever's been output to the console.log up until the moment you decide to read it, using Javascript?

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1  
Not standard, no. One could monkey-patch console.log to use an internal queue (and also write-through) - or perhaps look into browser/extension specific support (e.g. any Firebug hook?). –  user2246674 Sep 19 '13 at 21:42
1  
Maybe this could help you move in the right direction? stackoverflow.com/questions/601363/… –  Sandeep Bansal Sep 19 '13 at 21:43
    
@user2246674 I think your comment is good enough to be an answer. –  Renan Sep 19 '13 at 21:45

1 Answer 1

up vote 6 down vote accepted

You can make a proxy around it, such as :

(function(win){
    var ncon = win.console;

    var con = win.console = {
        backlog: []
    };

    for(var k in ncon) {
        if(typeof ncon[k] === 'function') {
            con[k] = (function(fn) {
                return function() {
                    con.backlog.push([new Date(), fn, arguments]);
                    ncon[fn].apply(ncon, arguments);
                };
            })(fn);
        }
    }
})(window);
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But I have to be quick enough to override the console before some script for example starts using it, otherwise I'll lose whatever that script logged up until the moment I start overriding the console. Also, if a script uses "delete console;" my override will be lost, correct? So I'll need to set an interval to keep overriding the console, hoping that no logs are lost between those intervals, right? –  Sprout Coder Sep 19 '13 at 21:52
    
I don't think you can actually loop over the properties of console. –  Rocket Hazmat Sep 19 '13 at 21:53
    
@SproutCoder: delete console; is not a common line of code. If a script did that, I'd be worried what else it was doing. I wouldn't waste your time with an interval. As for being "quick enough", just load this as the 1st script on your page, that way you can be sure it's first. –  Rocket Hazmat Sep 19 '13 at 21:54
    
for(var k in console) if(typeof console[k] === 'function') console.log(k) seems to work at least in chrome. –  OneOfOne Sep 19 '13 at 21:54
    
@OneOfOne: It wasn't working for me before for some reason. Worked this time :) –  Rocket Hazmat Sep 19 '13 at 21:55

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