How to convert scala list to javascript array?
Question
Is there a simpler way of doing this?
$(document).ready(function () {
var jsArray = []
@if(scalaList != null) {
@for(id <- scalaList) {
jsArray.push('@id');
}
}
...
}
4 answers
solution1
8 2013-03-20 17:27:44
It's as simple as the following:
import play.api.libs.json.Json
val jsArr: JsValue = Json.toJson(scalaList)
You can also do that within a template:
@(list: List[Any])
@import play.api.libs.json.Json
<script type="text/javascript">
$(document).ready(function () {
var jsArr = @Json.toJson(list);
console.log(jsArr);
});
</script>
solution2
3 2013-03-20 10:57:11
You can use mkString for this.
$(document).ready(function () {
var jsArray = @if(scalaList != null) {
[ @scalaList.mkString(",") ]}
else {[]};
}
You should omit this if statement in view. Instead of this, check null in controller and put empty list to view, so this code can be more simpler in view
$(document).ready(function () {
var jsArray = [ @scalaList.mkString(",") ];
}
You don't need this quotes ' ' around id. In javascript 1 == '1' is true
solution3
2 2013-03-20 10:56:13
Have you tried something like:
var jsArray = new Array(@scalaList.map(x => "\"" + x + "\"").mkString(","));
or you can use a literal like
var jaArray = [ var jsArray = [@scalaList.map(x => "\"" + x + "\"").mkString(",")];
Also the if check is not required. For comprehensions are smart like that
$(document).ready(function () {
var jsArray = [@scalaList.map(x => "\"" + x + "\"").mkString(",")];
...
}
solution4
2 2013-03-20 12:54:57
I think every answer are good but still not safe because every answers don't care about value which including ' or ". Fortunately play framework support json, so you should use json to convert to javascript array.
@(json: String)
<html>
<head>
</head>
<body>
<script>
var json = @Html(json);
var list = json.list;
</script>
</body>
</html>
package controllers
import play.api._
import play.api.libs.json._
import play.api.mvc._
object Application extends Controller {
def index = Action {
val list = List( "hoge\"hoge", "moge'mo\"ge" )
val json = Json.stringify( Json.obj(
"list" -> JsArray( list.map( JsString(_) ) )
))
Ok(views.html.index(json))
}
}
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