Is JSF h:outputStylesheet converter the solution for creating dynamic CSS?

Recently, I came across the <h:outputStylesheet/> tag with a converter attribute. I tried attaching a dummy (pass-through) converter to it, but to my surprise, nothing happened. Upon further investigation, it appears that the converter is not even invoked when refreshing the browser.

I am curious - does this attribute serve any useful purpose? Or is it simply a byproduct of various design choices?

The reason for my inquiry is that I was hoping to utilize this attribute for client- or server-side CSS processing using technologies like less. I thought this attribute might facilitate such functionality.

javacssjsf-2

Answer №1

What purpose does this attribute serve? Is it simply a byproduct of various design choices?

It is intentionally included in the component as part of its extension from UIOutput. The converter associated with it is not utilized in any way.

I am curious because I was hoping to use this attribute for client- or server-side CSS manipulation using less or similar technologies.

You can leverage EL conventionally in CSS resources loaded via <h:outputStylesheet>. This feature was primarily added to ensure proper resolution of background image resources.

.some {
    background-image: url(#{resource[images/some.png]});
}

In the above example, it assumes that the image is located at /resources/images/some.png. In case you are using a library, remember to prefix the resource name with libraryname:.

.some {
    background-image: url(#{resource[somelibrary:images/some.png]});
}

This assumes the image is located at 

/resources/somelibrary/images/some.png
.

Other than that, EL can be used in CSS resources for various purposes like dynamically resolving colors, fonts, and more.

.some {
    color: #{theme.color};
    font: #{theme.font};
}

Here, #{theme} could refer to a session or application scoped managed bean.

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