On Sat, Feb 12, 2011 at 3:46 PM, clothears <[email protected]> wrote:
> > > It appears that if I set some value using CSS, then I am unable to
> > > read that value with JavaScript. I have, instead, to not bother
> > > setting it with CSS, but instead to initialise it (to the same value)
> > > with JavaScript, and then I find I can read it back correctly. Is this
> > > expected behaviour?
> >
> > Yes. I'm assuming you're trying to read these values through the el.style
> > object. This is safe for writing, but not for reading. To read (any
> > currently applied style for a specific element), there are two ways to
> go:
>
> Umm no. If I take as a specific example the left padding of a <div>,
> ...
> pad = parseInt (document.getElementById("xyz").style.paddingLeft);
>
Yeah. This is "trying to read these values through the el.style object". It
doesn't work that way. It works in some ways, but it's unreliable. The
computed styles is by far more reliable.
> But why can I not read it as above?
>
Because, simply put, that's not how browsers implement it. You need to get
the computed styles like I've shown you on IE and non-IE.
I wonder whether IE9 does getComputedStyle yet...
- peter
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