Using javascript in play template

Question

I\'m using the Play! Framework. And I have a scala.html template file.

I\'m trying to add a Google javascript library to add graphs to the Web app.

Basiclly

Answer 1

First thing: you should use your browser inspection tool to read the error(s) anyway, collecting data like this by simple loop isn't good idea as - as you can see you have an orphan comma char after last item - JavaScript doesn't accept this.

The best option is building JSON object in the controller's action and then passing it as param to the view. It guarantees that you won't have any syntax errors, like orphan commas, unclosed brackets, etc. Also if no items it will generate valid JS code like
var data = google.visualization.arrayToDataTable([]); (empty array)

The Java pseudo code looks like this (of course in your case you need to iterate your collection to fill the myValues List

public static Result chartData() {

    // For JS you need an array of arrays, so use a List of Lists in Java
    List<List<Object>> myValues = new ArrayList<>();

    // Add the header
    myValues.add(new ArrayList<Object>(Arrays.asList("Date", "Sale")));

    // Inserting dummy data, 
    // in this place you should iterate your `currentPage.getList()` instead
    myValues.add(new ArrayList<Object>(Arrays.asList("2010", 1000)));
    myValues.add(new ArrayList<Object>(Arrays.asList("2011", 1030)));
    myValues.add(new ArrayList<Object>(Arrays.asList("2012", 1530)));
    myValues.add(new ArrayList<Object>(Arrays.asList("2013", 3507)));


    // Convert the values to JSON 
    // and wrap it with play.twirl.api.Html, so you won't need to do this within the template
    Html chartData = new Html(Json.toJson(myValues).toString());

    return ok(views.html.myChart.render(chartData));
}

and your myChart.scala.html view

@(chartData: Html)

<script>
    var chartData = @chartData;
    console.log(chartData);

    // Or in your case...
    var data = google.visualization.arrayToDataTable(@chartData);
</script>

The result HTML code in browser is:

<script>
    var chartData = [["Date","Sale"],["2010",1000],["2011",1030],["2012",1530],["2013",3507]];
    console.log(chartData);

    // Or in your case...
    var data = google.visualization.arrayToDataTable([["Date","Sale"],["2010",1000],["2011",1030],["2012",1530],["2013",3507]]);
</script>

Answer 2

I think you need to add a quotation marks around the date:

@for(run <- currentPage.getList) {
  ['@run.runDate.format("yyyy")', @run.successPercentage],
 }