A simple ajax call using scala-js

ScalaJSExample.scala

package example

import scala.language.dynamics

import scala.scalajs.js
import js.Dynamic.{ global => g }
import org.scalajs.jquery.{jQuery => jQ, JQueryXHR, JQueryAjaxSettings}
//import scala.scalajs.js.{Dictionary, String, Any}


//code by Benjamin Jackman published to the Scala.js mailing list on Dec 16
class  JsObjectBuilder extends scala.Dynamic {
  def applyDynamicNamed[A](name: String)(args: (String, js.Any)*): A = {
    println(s"applyDynamicNamed($name)(args: $args")
    if (name != "apply") {
      sys.error("Call jsObj like this jsObj(x=1, y=2) which returns a javascript object that is {x:1,y:2}")
    }
    val obj = js.Object().asInstanceOf[js.Dictionary]
    args.foreach { case (name, value) =>
      obj(name) = value
    }
    obj.asInstanceOf[A]
  }
  //Allows for jsObj()
  def applyDynamic[A](name : String)(args: Nothing*) = {
    if (args.nonEmpty) {
      sys.error("Call jsObj only with named parameters.")
    }
    js.Object().asInstanceOf[A]
  }

  //Note that jsObj can also be given a type parameter
  //that type will be used as the return type,
  //However it's just a NOP and doesn't do real type
  //safety

}


object ScalaJSExample {
  val console = js.Dynamic.global.console
  def main(): Unit = {
    console.log("hello")
    val title = jQ("#h1")
    title.replaceWith("<h2>New Title<h2>")
    val paragraph = g.document.createElement("p")
    paragraph.innerHTML = "<strong>It works now!</strong>"
    g.document.getElementById("playground").appendChild(paragraph)
     val ttl=jQ("#turtle")
    val jsObj = new JsObjectBuilder
    val json = jsObj(url = "http://www.w3.org/People/Berners-Lee/card",
            success =   (data: js.Any, textStatus: js.String, jqXHR: JQueryXHR) =>{
              console.log(s"data=$data,text=$textStatus,jqXHR=$jqXHR");
              js.Dictionary()
            },
            error =  ( jqXHR: JQueryXHR, textStatus: js.String, errorThrow: js.String) => {
              console.log(s"jqXHR=$jqXHR,text=$textStatus,err=$errorThrow");
              js.Dictionary()
            },
          `type` = "GET"
    )
    jQ.ajax(json)
//    jQ.ajax(js.Dictionary(
//      "url" -> {val str: js.Any = "http://www.w3.org/People/Berners-Lee/card"; str},
//      "success" ->  { val res: js.Any =  test _; res },
//      "error" -> { val res: js.Any = err _; res } ,
//      "type" -> { val str: js.Any = "GET"; str }
//    ).asInstanceOf[JQueryAjaxSettings]
//    )

  }

  private def test(data: js.Any, textStatus: js.String, jqXHR: JQueryXHR): js.Dynamic = {
    console.log(s"data=$data,text=$textStatus,jqXHR=$jqXHR");
    null
  }

  private def err(jqXHR: JQueryXHR,  textStatus: js.String, errorThrow: js.String) : js.Any = {
    console.log(s"jqXHR=$jqXHR,text=$textStatus,err=$errorThrow");
    js.Dictionary()
  }
}

The code above compiles but it gives me a

  Uncaught TypeError: Object #<Object> has no method 'scala_Nothing' 

It does go into the applyDynamicNamed part and write out to the JS Console

  applyDynamicNamed(apply)(args: WrappedArray((url,http://www.w3.org/People/Berners-Lee/card), (success,function () { [native code] }), (error,function () { [native code] }), (type,GET)) 

The code generated by compiler "2.11.0-M7" which is close to the 2.10 one ( which has the same problem) is:

var json = ScalaJS.as.scala_Nothing(jsObj.applyDynamicNamed__T__Lscala_collection_Seq__O("apply", ScalaJS.modules.scala_Predef().wrapRefArray__AO__Lscala_collection_mutable_WrappedArray(ScalaJS.asArrayOf.java_lang_Object(ScalaJS.makeNativeArrayWrapper(ScalaJS.data.scala_Tuple2.getArrayOf(), [new ScalaJS.c.scala_Tuple2().init___O__O("url", "http://www.w3.org/People/Berners-Lee/card"), new ScalaJS.c.scala_Tuple2().init___O__O("success", (function(data, textStatus, jqXHR) {

    return this.$anonfun$2__Lscala_scalajs_js_Any__Lscala_scalajs_js_String__Lorg_scalajs_jquery_JQueryXHR__Lscala_scalajs_js_Dictionary(data, textStatus, jqXHR)

  })["bind"](this)), new ScalaJS.c.scala_Tuple2().init___O__O("error", (function(jqXHR$2, textStatus$2, errorThrow) {

    return this.$anonfun$3__Lorg_scalajs_jquery_JQueryXHR__Lscala_scalajs_js_String__Lscala_scalajs_js_String__Lscala_scalajs_js_Dictionary(jqXHR$2, textStatus$2, errorThrow)

  })["bind"](this)), new ScalaJS.c.scala_Tuple2().init___O__O("type", "GET")]), 1))));

found the answer: I forgot to type the answer jsObj[org.scalajs.jquery.JQueryAjaxSettings. This compiles
and runs correctly:

    val json = jsObj[org.scalajs.jquery.JQueryAjaxSettings](url = "http://www.w3.org/People/Berners-Lee/card",
            success =   (data: js.Any, textStatus: js.String, jqXHR: JQueryXHR) =>{
              console.log(s"data=$data,text=$textStatus,jqXHR=$jqXHR");
              js.Dictionary()
            },
            error =  ( jqXHR: JQueryXHR, textStatus: js.String, errorThrow: js.String) => {
              console.log(s"jqXHR=$jqXHR,text=$textStatus,err=$errorThrow");
              js.Dictionary()
            },
          `type` = "GET"
    )
    jQ.ajax(json)

I'm building a cordova application using scalajs and these examples have been very useful ! Thanks.
But I can't get the scala named parameters to work... The compiler complains "Cannot resolve symbol url, success, error and type"
Any idea of what could be wrong ?

Sebastien gave a new response to this here: https://groups.google.com/d/msg/scala-js/im08n5nxVnI/d31ibVSI_iUJ