FAQ - ThoughtWorksInc/Binding.scala GitHub Wiki

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I get the error each instructions must be inside a SDE block, how can I fix this? (Moved to Stack Overflow)

The code that causes this error is that your bind expression must not be outside of the scope of the @dom macro. This can happen when creating a closure (for example someCollection.map { item => <div>{item.bind}</div> }) and can be resolved by:

  • Refactoring the code in the closure into its own @dom annotated method.

  • Converting someCollection to a BindingSeq, for example:

    Constants(someCollection: _*).map { item => <div>{item.bind}</div> }

  • Provide a scalaz.Traverse type class for the collection (Run this example on ScalaFiddle)

    @dom def renderList(data: List[Binding[String]]) = <ol>{
  import scalaz.std.list._ // Type classes for List
  for (b <- data) yield {
    <li>{b.bind}</li>
  }
}</ol>

How do I create a Binding of HTML node with empty HTML content? (Moved to StackOverflow)

Wrap an HTML comment:

@dom def maybeEmpty: Binding[Node] = {
  if (math.random > 0.5) {
    <div>non-empty content</div>
  } else {
    <!-- empty content -->
  }
}

My input html forms misses focus/empties when a Var changes (Moved to Stack Overflow)

Maybe you defined the <input ...> and .bind in the same @dom method and the <input ...> is after .bind. Try to refactor the .bind and <input ...> into separate @dom methods or let the .bind expression nested in another DOM.

For example:

@dom def render(data: Binding[Int]) = {
  val className: String = s"class-name-for-div-${data.bind}"

  // <div> and <input> will be recreated once data changes.
  <div class={className}>
    <input type="text"/>
  </div>
}
@dom def render(data: Binding[Int]) = {
  val myInput = <input type="text"/>
 
  val className: String = s"class-name-for-div-${data.bind}"

  // <div> will be recreated once data changes.
  // <input> will not be recreated.
  <div class={className}>
    {myInput}
  </div>
}
@dom def render(data: Binding[Int]) = {
  // <div> and <input> will not be recreated when data changes.
  // Only the class attribute will be changed.
  <div class={s"class-name-for-div-${data.bind}"}>
    <input type="text"/>
  </div>
}
@dom def render(data: Binding[Int]) = {
  @dom val className: Binding[String] = s"class-name-for-div-${data.bind}"

  // <div> and <input> will not be recreated when dataValue changes,
  // only the class attribute will be changed.
  <div class={className.bind}>
    <input type="text"/>
  </div>
}

I am getting Stack Overflow when compiling. (See Stack Overflow)

For complex web views, stack size is not enough. You need to increase it for the compiler. For sbt you can do it adding a .sbtopts in the root of your project with the line:

-J-Xss5m

Intellij complains that I should have Binding[Node] instead of Elem (Moved to Stack Overflow)

Intellij doesn't support macro annotation. To make it happy, bring the following implicit into the scope

implicit def makeIntellijHappy(x: scala.xml.Node): Binding[org.scalajs.dom.raw.Node] = ???

This code is never actually executed.

How do I declare embedded css? (Moved to Stack Overflow)

Use a CDATA section in the style element.

@dom def css = <style>
  <![CDATA[
    body {
      background-color: lightblue;
    }
  ]]>
</style>
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