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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<!--
* Developed by :
* ROUTE-TO-PA Project - grant No 645860. - www.routetopa.eu
*
-->

<link rel="import" href="../base-ajax-json-jsonpath-datalet/base-ajax-json-jsonpath-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-jsonpath-datalet data-url="{{dataUrl}}" fields="{{fields}}" data="{{data}}"></base-ajax-json-jsonpath-datalet>
    </template>

    <script src="static/js/highcharts.js"></script>
    <script src="static/js/exporting.js"></script>

    <script>
        var HighchartsBehavior = {

            properties: {

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

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

                series_type:{
                    type: String,
                    value: "line"//spline,time
                }
            },
            /**
             * Normalizes a number in agreement with javascript's conventions. Delete all NaN characters. Exception: number representing lat & long remain unchanged.
             */
            jNumConverter: function(num) {
                //lat-long
                if(num.charAt(num.length-7) == "." && (num.match(/[\.,]/g) || []).length == 1)
                    return num;

                var jNum = "";
                for (var i = 0; i < num.length; i++) {
                    if(num[i].match(/[\.,]/g))
                        if (i == num.length - 3)
                            jNum += ".";
                        else
                            ;
                    else if (!isNaN(num[i]))
                        jNum += num[i];
                }

                return jNum;
            },
            /**
             * Populate the categories and the series array.
             *
             * @method transformData
             *
             * @param {Event} e
             */
            transformData: function () {

                if(this.data.length == 0) return;

                this.properties.categories.value = this.data[0].data;

                for (var i = 1; i < this.data.length; i++)
                {

                    this.data[i].data.every(function (element, index, array) {
                        try {
                            var e = HighchartsBehavior.jNumConverter(element);
                            (isNaN(element)) ? array[index] = parseFloat(HighchartsBehavior.jNumConverter(element)) :
                                    array[index] = parseFloat(element);
                        }catch(e){
                            //console.log("Parsing data error. Highchart-datalet.selectData");
                        }
                        return true;
                    });

                    this.properties.series.value.push(this.data[i]);
                }
            },

            setParameters: function(params)
            {
                var chart = $(this._component.$.charts.$.container).highcharts();

                chart.setTitle({text: params['title']});
                chart.xAxis[0].setTitle({text: params['x-axis-label']});
                chart.yAxis[0].setTitle({text: params['y-axis-label']});

                chart.tooltip.options.formatter = function() {
                    return this.x + '<br/><br/><span style="fill:#7cb5ec" x="8" dy="15">●</span> ' + this.series.name + ': <b>' + this.y + ' ' + params['suffix'] + '</b>';
                }

            },
        };

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

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

</dom-module>