If you define a function as a member of the window object in IE7, the keyword this obviously refers to the wrong object:
window.myFunction = function() {
return (this === window);
}
A call to myfunction() in IE7 would incorrecty yield false. This problem also affects exception handling. Predefined event-handlers like onload are not affected.
Test page Workaround is included
Reported by: Arnold Konrad.
Explorer 5-6 Windows, Explorer 7 | Reported on 20 March 2007.
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2 Posted by Arnold Konrad on 24 March 2007 | Permalink
The really annoying thing about this bug is that it affects exception handling:
function Z(){
window.a = function(){
throw new Error("Something went wrong!");
}
}
Z();
try {
a();
} catch(e) {
alert(e.message);
}
The above example won't work in IE.
3 Posted by Eric Gerds on 25 March 2007 | Permalink
Yep, definitely a bug.
Add: "var a = null" in front of your code, then it works for me.
Don't know why though.
1 Posted by Eric Gerds on 23 March 2007 | Permalink
The 'this' keyword does indeed point to the window object. The problem is that (this==window) gives the wrong result, whereas (window==this) gives the correct result. Definitely a bug, though.
function Z(){
window.a = function(){
alert((this==window) + "\n" + (window==this) + "\n" + this.Z)
}
}
Z();
a()