datalets/highcharts-datalet/highcharts-datalet.html

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@license
    The MIT License (MIT)

    Copyright (c) 2015 Dipartimento di Informatica - Universit� di Salerno - Italy

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    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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<!--
* Developed by :
* ROUTE-TO-PA Project - grant No 645860. - www.routetopa.eu
*
-->

<link rel="import" href="../base-ajax-json-alasql-datalet/base-ajax-json-alasql-datalet.html">

<!--
The `highcharts-datalet` uses the base-ajax-json-jsonpath-datalet as data retriving and selection mechanism. It defines the common properties
for all the highchart datalets : categories, series and series_type. Overmore override the transformData method
to create and populate categories and series array. Every specific highchart chart implementation (eg linechart, barchart, columnchart ...)
will use highcharts-datalet properties to create the appropriate chart.

Example :

    <dom-module id="highcarts-chart-datalet">
        <template>
            ...
            <highcharts-datalet id="charts" data-url="{{dataUrl}}" fields="{{fields}}"></highcharts-datalet>
            ...
        </template>
    </dom-module>

@element highcharts-datalet
@status v0.1
@homepage
@group datalets
-->

<dom-module id="highcharts-datalet">

    <template>
        <div id="container" style="width:auto; height:auto;"></div>
        <base-ajax-json-alasql-datalet data-url="{{dataUrl}}" fields="{{fields}}" data="{{data}}" title="{{title}}" description="{{description}}" export_menu="{{export_menu}}"></base-ajax-json-alasql-datalet>
    </template>

    <script src="static/js/highcharts.js"></script>
    <script src="static/js/highcharts-more.js"></script>
    <script src="static/themes/themes.js"></script>

    <script>
        var HighchartsBehavior = {

            properties: {
                categories: {
                    type: Array,
                    value: []
                },
                series: {
                    type: Array,
                    value: []
                }
            },

            transformData: function () {
                if(this.data.length == 0)
                    return;

                var selectedFields = JSON.parse(this._component.getAttribute("selectedfields"));

                var inputs = [];
                if(selectedFields) { /*if deprecated*/
                    for (var i=0; i < selectedFields.length; i++)
                        if (selectedFields[i])
                            inputs.push(selectedFields[i].field);
                }

                var cat_index = inputs.indexOf("Categories");

                if(cat_index == -1) {
                    categories = this.data[0].data;
                    series = [];
                    for (var i = 1; i < this.data.length; i++)
                        series.push(this.data[i]);

                    this.properties.categories.value = categories;
                    this.properties.series.value = series;
                }
                else {
                    var x = this.data[0]["data"];
                    var y = this.data[1]["data"];
                    var cat = this.data[cat_index]["data"];

                    var categories = x.filter(function(item, pos) {
                        return x.indexOf(item) == pos;
                    });

                    var s = cat.filter(function(item, pos) {
                        return cat.indexOf(item) == pos;
                    });

                    var series = [];
                    for(var i = 0; i < s.length; i++) {
                        series.push({name: s[i], data: new Array(categories.length+1).join('0').split('').map(parseFloat)});
                    }

                    for(var i = 0; i < y.length; i++){
                        var index = categories.indexOf(x[i]);
                        var s = series.filter(function( obj ) {
                            return obj.name == cat[i];
                        });
                        s[0]["data"][index] = y[i];
                    }

                    this.properties.categories.value = categories;
                    this.properties.series.value = series;
                }
            },

            redraw: function () {
                $(this._component.$.charts.$.container).highcharts().reflow();
            }

        };

        var HighchartsComponentBehavior = $.extend(true, {}, BaseDataletBehavior, WorkcycleBehavior, AjaxJsonAlasqlBehavior, HighchartsBehavior);

        HighchartsDatalet = Polymer({
            is : 'highcharts-datalet'
        });
    </script>

</dom-module>