html, body, #container {

    width: 100%;

    height: 100%;

    margin: 0;

    padding: 0;

}

anychart.onDocumentReady(function () {

    var data = anychart.data.set([

        ["Point A", 231],

        ["Point B", 131],

        ["Point C", 212],

        ["Point D", 94]

    ]);

    var view = data.mapAs();

    var iterator = view.getIterator();

    iterator.select(3);

    var chart = anychart.line(data);

    var getIndex = iterator.getIndex(); // get index

    chart.title("Index - " + getIndex + "," + " value: " + iterator.get("x"));

    chart.container("container");

    chart.draw();

});