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https://issues.apache.org/jira/browse/CLK-545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12705409#action_12705409
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Adrian A. commented on CLK-545:
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> If the link control does not already have a class already set we could render 
> this.
Classes can be additive. The nice thing about this approach is that the 
original style is kept (e.g. green colored links), but the opacity trick makes 
it look disabled.

> We may want to consider a class name like "controlDisabled" to make it less 
> likely that there 
> is a collision with an existing class
True. This is more error proof. "clickDisabled" would be an option too, but I 
think we should avoid
using the words "click" and "ad." in generated code as much as possible, 
because browser plug-ins
(like AdBlock et. co) seem to filter them many times :(.

> Isn't IE a bit more pick with opacity, I recall you need some funky IE script 
> for this. 
I'm not sure (on the browsers I could test, it was looking OK). I think this is 
why the redundant declaration of the opacity is there. 
I took the snippet (and it worked) from the stylesheet of the project Joseph 
mentioned here [#CLK-391]
http://github.com/devrieda/custom_buttons/tree/master


> Better rendering of disabled link controls
> ------------------------------------------
>
>                 Key: CLK-545
>                 URL: https://issues.apache.org/jira/browse/CLK-545
>             Project: Click
>          Issue Type: New Feature
>          Components: core
>            Reporter: Adrian A.
>
> Add better rendering of disabled link controls. Right now is a simple span 
> text and there's no visual hint that this might be a disabled Link (except 
> for that ActionButton).
> Possible improvements:
> - 50% opacity for images/icons
> - title on mouse over
> - href browser status bar hint on mouse over (but no click possible - since 
> the link is disabled)

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