我有一个有Vars
约束力的声明,就像这样
val data: Vars[Contact] = Vars.empty[Contact]
我试图显示这样的元素数量:
<div>{data.all.bind.size}</div>
但这会产生一个复杂的错误
type mismatch;
[error] found : com.thoughtworks.binding.Binding[App.this.data.All[App.this.Contact]]
[error] (which expands to) com.thoughtworks.binding.Binding[scala.collection.mutable.Buffer[_ <: App.this.Contact]]
[error] required: com.thoughtworks.binding.Binding[scala.collection.mutable.Buffer[_$6]] where type _$6 <: App.this.Contact
[error] {this.data.all.bind.size}</div>
如何使这项工作?
更新
尝试String
用作Vars
绑定类型,结果相同
type mismatch;
[error] found : com.thoughtworks.binding.Binding[App.this.data.All[String]]
[error] (which expands to) com.thoughtworks.binding.Binding[scala.collection.mutable.Buffer[_ <: String]]
[error] required: com.thoughtworks.binding.Binding[scala.collection.mutable.Buffer[_$6]] where type _$6 <: String
[error] {this.data.all.bind.size}</div>
请注意,我使用的是 Scala.js 1.2、Scala 2.13.3,
libraryDependencies += "org.lrng.binding" %%% "html" % "latest.release"
不幸的是,由于它不支持 Scala 2.13,因此无法提供 scalafiddle,而是我在这里创建了一个副本项目 -
https://www.dropbox.com/ s/i9dpsa9pz0lejtj/bindingreplica.tar.gz?dl=0