I'm experimenting with Kotlin/JS, building a web t...

# javascript

[Jon Shemitz]

I'm experimenting with Kotlin/JS, building a web toy. All the pure-Kotlin logic works fine (though unit testing is slower than on JVM, and it can't locate the lines that throw exceptions) and the HTML DSL was easy to pick up and extend, so long as I was just using old, old HTML - tables, divs, spans, and the like. But I can't seem to get more 'modern' CSS to work at all!

I'm trying to specify a transition. My expectation is that within a css {} block, I should either be setting transition or be setting transitionProperty + transitionDuration. But while the css.transition property is a Transition?, clicking through to the Transition source shows it as a sealed external interface, not a class with constructor parameters.

Similarly, I'd like to set a gradient background. Again, I expect that I should set backgroundImage within a css {} block, but BackgroundImage is also coming up as a sealed external interface.

Should these features be working as I expect, or are they still works in progress? Is it possible that my project configuration needs some tweaking? (The libraries do include Gradle: org.jetbrains.kotlin-wrappers:kotlin-csstype:klib:3.1.0-pre.3462.)

[Artem Kobzar]

@turansky ^^

[turansky]

For complex values we have factory functions.
For Transition we have 3 factories with same name.

[Jon Shemitz]

Thank you, @turansky, that makes sense. Is there any documentation that would tell me the names of these factory functions? Or is there an import I should add that would let IDEA auto-suggest these functions?

[turansky]

BackgroundImage

[turansky]

Main rule - we have safe factory functions for all.
asDynamic and unsafeCast aren't required.

[turansky]

For complex values, like Transition - functions we same name name.
For CSS functions, like url - functions with same name.
For primitives and array like functions we provide: string, integer, number , array, many

[turansky]

Predefined constant:
Auto.auto
None.none
and more.
And it's parent types of interface, which you need.
For example you can use constants from PropertyName for TransitionProperty