Re: Cross-browser setOpacity() without browser sniffing?

Hi Richard,

Richard Cornford wrote:
petermichaux@xxxxxxxxx wrote:
Does anyone have a a cross-browser setOpacity function
that does not use browser sniffing? I looked at the Yahoo!
UI function and it detects IE by looking for
window.ActiveXObject. I also looked at Scriptaculous and
it uses navigator.userAgent.
<snip>

You should not need to ask this question.

It seems like in the browser scripting world there are always suprises
due to bugs. I don't know about all the bugs. Also the Yahoo! UI guys
do know a thing or two and the fact that they double up with the
following two checks makes me wonder if something else is going on.

if (window.ActiveXObject && typeof el.style.filter == 'string')


The general principle of
feature detection is to devise a test that is as closely related
(preferably directly related) to the question that needs to be answered.
If your question is whether a browser supports IE-style filters then
test for the manifestation of filters; the - filters - collection of the
element:-

if(el.filters){
... //has filters collection.
}

- or the - filters - property of the style object:-

if(typeof el.style.filters == 'string'){
...//has filters property on style object..
}

(the latter being the most direct test)

Richard, you have helped me much in the past months. I do appreciate it
greatly. Due to your persistance, I am currently trying to get myself
off the Yahoo! UI code and also ultimately rid my Rails code of
Prototype.js. I am moving to the layered library approach that you
described previously.

Thank you,
Peter

.

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