Idiomatic optional classes and attributes

[Byron Weber Becker]

I sometimes want to do something like the following:

val myClassAttr = `class` := if (someCondition) "doSomethingSpecial" else ""

...

p(myClassAttr)("The contents of my paragraph")

...

This works, but it generates <p class="">The contents of my paragraph</p>, which doesn't feel very elegant to me when someCondition is false.

I think my question boils down to whether there is a way to generate a null attribute that expands to nothing when the html is generate.

Thanks!

Byron

[Haoyi Li]

So far I've adopted this pattern:

scala> val someCondition = false

someCondition: Boolean = false

scala> val myClassAttr = if (someCondition) Some(`class` := "doSomethingSpecial") else None

myClassAttr: Option[scalatags.AttrPair] = None

scala> p(myClassAttr)("The contents of my paragraph")

res2: scalatags.HtmlTag = <p>The contents of my paragraph</p>

It would be better if there was a Boolean.toOption method, but that's somewhat beyond the scope of Scalatags. e.g. with scalaz you could write

val myClassAttr = someCondition.option(`class` := "doSomethingSpecial") 

Which looks considerably better.

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[Byron Weber Becker]

Nice!  Thank you.