Very weird array problem

[victorsk]

Hello,

I have a very strange problem. I've defined an global array 'cursor' like this:
cursor = new Array(5);
and then my function doSomething(evt, current) gets the value of 'current' and is supposed to access 'cursor[current].setAttribute()'
BUT, for some reason, when I try to do that I get:
"Type Error: cursor[current] has no properties" error.

So, then I tried to force 'cursor' array recognize index using conventional for-loop like this:
for (var i = 0; i < 5; i++) {
if (current == i) {
cursor.setAttributeNS(null, "x", cur_x);
cursor.setAttributeNS(null, "y", cur_y);
}
}

Still, I am getting error "cursor has no properties. BUT, if I access 'cursor' like this:
//use 1 here
cursor[1].setAttributeNS(null, "y", cur_y);

everything works fine. Could somebody please tell me what is going on here? It flies against rules of common sense as far I see. Thank you very much.

Victor.

 

[rac2]

Quite interesting question.

What is that method setAttributeNS()?

I have never seen that before.

What kind of things are you storing in the array?

Is cursor a pointer to an object with a method setAttributeNS()?

 

[victorsk]

Hi,

Thanks for replying. I am working with SVG and so I am trying to set the properties of an SVG image. I presume 'cursor' is a pointer to an SVG document image:
In my Init(evt) {
cursor[1] = svgDocument.getElementById("image_url0");
}
So, here I am setting it to point(C++ term?) to an image and then set its attributes in my doSomething() method.

Thank you,
Victor.

 

[trollacious]

It sounds like you don't have as many cursor objects as you are trying to reference in your loop. Have you tried:

alert(cursor.length);

to see if you're trying to go beyond the end of the array?

And why aren't you using:

for (var i = 0; i < cursor.length; i++)

? Are you declaring the cursor array before or after you try to access the individual elements?

Lee

 

[victorsk]

Hi,

Thank you very much for replying. Yes, you were right, I didn't have enough objects and that was the problem, my cursor size was 5 while I assigned values only to cursor[1] - It's been a looooong day

Thanks,
Victor.