leafletjs-datalet.html 5.17 KB
<!--
The MIT License (MIT)

Copyright (c) 2015 ROUTE-TO-PA CONSORTIUM

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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<link rel="import" href="../base-ajax-json-jsonpath-datalet/base-ajax-json-jsonpath-datalet.html">

<!--

`leafletjs-datalet` is a map datalet based on open source project leafletjs <http://leafletjs.com/>

Example:

<leafletjs-datalet data-url="http://ckan.routetopa.eu/api/action/datastore_search?resource_id=73e02092-85a1-434e-85fe-0c9a43aa9a52&amp;limit=10000"
                   query="$['result']['records'][*]['Lat']###$['result']['records'][*]['Lng']###$['result']['records'][*]['Link']">


-->

<dom-module name="leafletjs-datalet">
    <template>
        <link rel="stylesheet" href="leafletsjs/leaflet.css" />
        <style>
            #leafletjs { height: 600px; }
        </style>

        <div id="leafletjs"></div>
        <base-ajax-json-jsonpath-datalet data-url="{{dataUrl}}" fields="{{fields}}"></base-ajax-json-jsonpath-datalet>

    </template>

    <script src="leafletsjs/leaflet.js"></script>

    <script>

        var leafletjsBehavior = {

            /**
             * Read markers coordinates from the data object and add the marker to the map.
             * Call a method for the map redraw and set the viewport in order to fit all the markers in the viewport.
             *
             * @method transformData
             */
            transformData: function(){
            	            	             
				var coordinates = [];
				//var keys = Object.keys(this.properties.data.value[0]);

                for(var i=0; i<this.data[0].data.length; i++)
                {
                    coordinates.push([parseFloat(this.data[0].data[i]), parseFloat(this.data[1].data[i])]);
                    var marker = L.marker([coordinates[i][0], coordinates[i][1]]).addTo(this._component.map);

                    if(this.data[2])
                    {
                        var popup = L.popup().setContent('<image height="100" width="100" src="' + this.data[2].data[i] + '" />');
                        marker.bindPopup(popup);
                    }
                }

                this._component.map.invalidateSize();
                this._component.map.fitBounds(coordinates);            	
            	
            }
        };


        Polymer({

            is : 'leafletjs-datalet',

            properties : {

                /**
                 * Store a reference to the leafletjs map object created in 'ready' callback
                 * @attribute map
                 * @type Object
                 */
                map :
                {
                    type: Object,
                    value:null
                },

                /**
                 * An Array with all the markers extracted from the dataset
                 * @attribute markers
                 * @type Array
                 */
                markers :
                {
                    type : Array,
                    value : []
                }
            },

            /**
             * 'ready' callback create the map object, set the tileLayer to openstreetmap and the default icon image path.
             * Moreover extend the leafletjsComponentBehavior with BaseDataletBehavior, WorkcycleBehavior and leafletjsBehavior
             * and run the Datalet workcycle.
             *
             * @method ready
             */
            ready: function(){

				this.map = L.map(this.$.leafletjs).setView([0, 0], 13);

                L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
                    maxZoom: 18,
                    attribution: 'Map data © <a href="http://openstreetmap.org">OpenStreetMap</a> contributors'
                }).addTo(this.map);

                L.Icon.Default.imagePath = 'http://services.routetopa.eu/DEEalerProvider/COMPONENTS/datalets/leafletjs-datalet/leafletsjs/images';

                var leafletjsComponentBehavior =  $.extend(true, {}, BaseDataletBehavior, WorkcycleBehavior, AjaxJsonJsonPathBehavior, leafletjsBehavior);
                leafletjsComponentBehavior.init(this);
            }
        });
    </script>
</dom-module>