AttributeAppender seems to be ignored in AbstractAjaxBehavior.onComponentTag

[Thorsten Schöning <ts...@am-soft.de>]

Hi all,

I have a class extending AbstractAjaxBehavior and overriding
onComponentTag(ComponentTag tag), because I need a custom css class
added. I thought this would be an easy task by simply adding an
AttributeAppender like the following:

> tag.addBehavior(AttributeModifier.append("class", "murks2"));

But that doesn't work, the "class" attribute retains it's initial
value. If I add low level like the following the attribute's value
changes successfully:

> tag.append("class", "murks", " ");

I googled a bit and found one thread about AjaxLink and the same
problem, but no description on why using AttributeModifier doesn't
work and I don't even use AjaxLink at all.

Am I doing something wrong or is this intended behavior? In the latter
case, what should I do to let my AjaxBehavior change the "class"
attribute?

Thanks for your help!

Mit freundlichen Grüßen,

Thorsten Schöning

-- 
Thorsten Schöning       E-Mail: Thorsten.Schoening@AM-SoFT.de
AM-SoFT IT-Systeme      http://www.AM-SoFT.de/

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Re: AttributeAppender seems to be ignored in AbstractAjaxBehavior.onComponentTag

[Sven Meier <sv...@meiers.net>]

Hi Thorsten,

adding a behavior to the tag is nothing you would want to do in your 
behavior, because
it's too late to have any effect on the current rendering (see 
Component#renderComponentTag()).

Behaviors on markup tags are meant to be used to alter the markup 
independent of any component, see RelativePathPrefixHandler and 
WicketMessageTagHandler for inspiration.

 > what should I do to let my AjaxBehavior change the "class" attribute?

The following is just fine:

     tag.append("class", "murks", " ");

Regards
Sven

On 27.01.2015 19:25, Thorsten Schöning wrote:
> Hi all,
>
> I have a class extending AbstractAjaxBehavior and overriding
> onComponentTag(ComponentTag tag), because I need a custom css class
> added. I thought this would be an easy task by simply adding an
> AttributeAppender like the following:
>
>> tag.addBehavior(AttributeModifier.append("class", "murks2"));
> But that doesn't work, the "class" attribute retains it's initial
> value. If I add low level like the following the attribute's value
> changes successfully:
>
>> tag.append("class", "murks", " ");
> I googled a bit and found one thread about AjaxLink and the same
> problem, but no description on why using AttributeModifier doesn't
> work and I don't even use AjaxLink at all.
>
> Am I doing something wrong or is this intended behavior? In the latter
> case, what should I do to let my AjaxBehavior change the "class"
> attribute?
>
> Thanks for your help!
>
> Mit freundlichen Grüßen,
>
> Thorsten Schöning
>


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