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On Wednesday, April 29, 2015 at 4:43:03 PM UTC+8, Adrian Aioanei wrote:
>
> Is there a built in way to have a dynamic class specified for a custom
> element?
> There's two places in the documentation that refers to this approach:
>
> 1. reflectToAttribute, which can be specified like this:
> properties: {
> class: {
> type: String,
> computed: 'computeClass(var1, var2)',
> reflectToAttribute: true
> }
> }
> However this issues the following error:
> Uncaught TypeError: Cannot read property '_xScopeSelector' of
> undefinedPolymer.Base._addFeature._scopeElementClass @
> x-styling.html:265Polymer.Base._addFeature.serializeValueToAttribute @
> x-styling.html:279Polymer.Base._addFeature.reflectPropertyToAttribute @
> attributes.html:107Polymer.Base.extend.reflectEffect @ effects.html:33
>
> 2. Another approach that I tried was using hostAttributes. This one works
> with static values, but doesn't work with binding or computed values, like:
> hostAttributes:{
> class: 'computeClass(var1, var2)'
> }
>
> The workaround now is to have a div as the parent of all elements in the
> template, and have a class property attached to it with data binding.
> But is there a way to dynamically change an element's class?
>
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