Last version:
globalEval = (function(Image){
Image.style.position = "absolute";
Image.style.left
Image.style.top = "-10000px";
return function(eval){
var body = document.body || document.documentElement;
(Image = Image.cloneNode(true)).setAttribute("onerror", eval);
body.appendChild(Image);
Image.onerror.call(null);
body.removeChild(Image);
}
})(new Image(1, 1));
But for described reason, all this stuff become the same of this one,
correct?
globalEval = function(){Function(arguments[0])()};
:-)
On Thu, Sep 18, 2008 at 11:57 AM, Andrea Giammarchi <
[EMAIL PROTECTED]> wrote:
> 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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