post2.js

$(function(){
    'use strict';
    var payload;

    function getPlotlyGraphData() {
        return [{x:[1,2,3],y:[2,4,3]},{x:[1,2,3],y:[9,7,8]}];
    }

    function getPlotlyGraphLayout() {
        return {};
    }

    function postCallback (body) {

        var res = JSON.parse(body);

        if ('url' in res) window.open(res.url);

    }

    payload = {
        data: getPlotlyGraphData(),
        layout: getPlotlyGraphLayout()
    };


    $('#plotly-graph-export').click( function () {

        $.post(
            'https://stage.plot.ly/datacache/',
            {payload: JSON.stringify(payload)},
            postCallback
        );

    });


    return;

});