Still me, Diego :-)
I was confused about the usage of cuntion inside the setAttribute.
As you know, it is a function by default, so this example works, but there
are still problems I was talking about:
onload = function(){
var img = document.createElement("img");
img.setAttribute("onerror", "alert([this, arguments.length])");
document.body.appendChild(img);
img.onerror();
document.body.removeChild(img);
};
To solve it we could simply use a function like this one:
globalEval = (function(Image){
Image.style.position = "absolute";
Image.style.left
Image.style.top = "-10000px";
return function(eval){
Image.setAttribute("onerror", eval);
with(document.body || document.documentElement){
appendChild(Image);
Image.onerror.call(null);
removeChild(Image)
}
}
})(new Image(1, 1));
But the arguments problem is still there:
arguments = [1,2,3];
globalEval("document.write([arguments.length, arguments.callee])");
0,function onerror(event, source, lineno) {
document.write([arguments.length, arguments.callee]); }
Kind Regards
On Thu, Sep 18, 2008 at 9:18 AM, Andrea Giammarchi <
[EMAIL PROTECTED]> wrote:
> Hi Diego,
>
> in my test cases your example does not work.
> At the same time, I am not sure you have to put the image in the DOM,
> before the event could be called.
>
> If you need to do it, the evaluation will be async, so as globalEval
> replacement, it is not that good.
>
> If not, you are still evaluating "whatever" inside a function and, as you
> know, this simply means that if you have a global scope variable, called
> arguments, you will never be able to use it as is, unless you specify the
> global object as prefix (window or self, because this will be the image
> itself)
>
> I wonder why you are still looking for a globalEval alternative. What I
> mean is: which kind of problem has the current solution?
>
> I would like to know it and try to fix it, if it is possible, since "I feel
> a bit responsible" for that code :-)
>
> Regards
>
>
> On Thu, Sep 18, 2008 at 1:23 AM, Diego Perini <[EMAIL PROTECTED]>wrote:
>
>>
>> Hi devs,
>> would like to leave a note on this, seem interesting and maybe can be
>> used as an alternative to globalEval.
>>
>> It turns out that we have another way to evaluate javascript strings
>> easily, namely by using setAttribute() to assign a string value to
>> some specific attribute like the DOM 0 (or in-line) event.
>>
>> So, at first I tried using the standard body "onload" attribute, but I
>> in IE that didn't work as in FF.
>>
>> Then I did some test with an image and that worked both in FF and in
>> IE (believe it works in other browsers too).
>>
>> var img = document.createElement('img'); // or just new Image();
>> img.setAttribute("onabort", "function () {}"); // onerror, onload also
>> works
>> alert(typeof img.onload); // yeld function instead of string...good.
>>
>> I was thinking to this while thinking to Air, Caja and similars.
>>
>> Evil...good...useful ?
>>
>> Your thoughts appreciated.
>>
>> --
>> Diego Perini
>>
>>
>> >>
>>
>
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