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inputText("validationExample", "messages", required() ++ isNumber)

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inputText("validationExample", "messages", firstOnly(required(), isNumber))

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section(
  
  messages = "sectionText",       // the name of properties bundle containing section-level text
  
  nestingCheckboxes(          
    "myCheckboxes",               // the unique name of our widget
    "questionWording",            // the name of the properties bundle containing text for the widget
    required,                     // constraints applied to the widget
    "contactMethods",             // the name of the properties bundle containing the key and labels for each checkbox choice
    Map(                          // our nested widgets

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EMAIL=Email
PHONE=Phone
TEXT=Text message

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def nestedInput[M <: Messages[M]](name: String, ...)(...) = 
  Input(name, ..., layoutTemplateName = "nestedWidgetBoilerplate.mustache", ...)

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{{#choices}}
  <div class="multiple-choice">
    <input id="{{id}}_{{value}}" name="{{name}}" type="checkbox" value="{{value}}" {{#selected}} checked="checked" {{/selected}} />
    <label for="{{id}}_{{value}}">{{{text}}}</label>
  </div>
  {{{nestedWidget}}} <!-- addition to output the html of the already-rendered nested widget -->
{{/choices}}

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case class NestingCheckboxes[C <: Messages[C]](... nestedWidgets: Map[String, Widget]) extends NestingMultipleChoice[C] {
  
  override val nestingMultipleChoiceWidget = new Checkbox(...) {
    override def render(form: Form, errors: ValidationErrors, requestInfo: RequestInfo)(...): Future[String] = {
      ...
      // pass result of templateChoices(form, errors, requestInfo) to my template and return the rendered result
    }
  }
}

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case class NestingCheckboxes[C <: Messages[C]](... nestedWidgets: Map[String, Widget]) extends NestingMultipleChoice[C] {
  
  override val nestingMultipleChoiceWidget = new Checkbox(...)
}

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trait NestingMultipleChoice[C <: Messages[C]] extends WidgetGroup {
  
  def nestedWidgets: Map[String, Widget]
  
  def nestingMultipleChoiceWidget: MultipleChoice[C]
  
  override lazy val widgets: Seq[Widget] = nestingMultpleChoiceWidget +: nestedWidgets.values.toSeq
  
  def templateChoices(form: Form, errors: ValidationErrors, requestInfo: RequestInfo)(...): Future[List[Map[String, Any]]] = {
    nestingMultipleChoiceWidget.choicesForTemplate.map(...

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trait NestingMultipleChoice[C <: Messages[C]] extends WidgetGroup {
  
  def nestedWidgets: Map[String, Widget]
  
  def nestingMultipleChoiceWidget: MultipleChoice[C]
  
  override lazy val widgets: Seq[Widget] = nestingMultpleChoiceWidget +: nestedWidgets.values.toSeq
  
  def templateChoices(form: Form, errors: ValidationErrors, requestInfo: RequestInfo)(...): Future[List[Map[String, Any]]] = {
    nestingMultipleChoiceWidget.choicesForTemplate.map(...