nagix/chartjs-plugin-datasource

'use strict';

import Chart from 'chart.js';

var helpers = Chart.helpers;

// Base class for all data source (csv, json, etc)
var DataSource = function(chart, options) {
    this.initialize(chart, options);
};

helpers.extend(DataSource.prototype, {
    _defaultConfig: {},

    _responseType: null,

    initialize: function(chart, options) {
        var me = this;

        me._chart = chart;
        me._options = helpers.extend({}, me._defaultConfig, options);
    },

    request: function(callback) {
        var me = this;
        var url = me.getUrl();
        var xhr = new XMLHttpRequest();

        xhr.open('GET', url);
        xhr.responseType = me._responseType;
        xhr.onreadystatechange = function() {
            var data;

            if (xhr.readyState === 4) {
                if (xhr.status === 200) {
                    data = me.convert(xhr.response);
                }
                callback.call(me, {
                    success: xhr.status === 200,
                    data: data
                });
            }
        };
        xhr.send();
    },

    convert: function() {
        // noop
    },

    getType: function() {
        return this._options.type;
    },

    getUrl: function() {
        return this._options.url;
    }
});

DataSource.extend = helpers.inherits;

export default DataSource;