datalets/leafletjs-datalet/leafletjs-datalet.html

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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
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

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
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-->

<link rel="import" href="../base-datalet/base-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-datalet data-url="{{dataUrl}}" query="{{query}}" fields-order="{{fieldsOrder}}"></base-datalet>

    </template>

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

    <script>

        var leafletjsBehavior = {

            /**
             * Extract all the data from the dataset according to the queries.
             *
             * @method selectData
             */
            selectData: function(){

                var queries =  this._component.query.split("###");

                for (var i = 0; i < queries.length; i++) {
                        var propName = this.getPropertyName(queries[i]);

                        temp = jsonPath(this.properties.json_results.value, queries[i]);
                        for (j = 0; j < temp.length; j++) {
                            if (i == 0) this.properties.data.value[j] = {};
                            currObj = {};
                            currObj[propName] = temp[j];
                            jQuery.extend(this.properties.data.value[j], currObj);
                        }
               }
            },

            /**
             * 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 index in this.properties.data.value)
                {
                    coordinates.push([parseFloat(this.properties.data.value[index][keys[0]]), parseFloat(this.properties.data.value[index][keys[1]])]);
                    var marker = L.marker([coordinates[index][0], coordinates[index][1]]).addTo(this._component.map);
                    var popup = L.popup().setContent('<image height="100" width="100" src="'+this.properties.data.value[index][keys[2]]+'" />');
                    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, AjaxJsonDataRequestBehavior, leafletjsBehavior);
                leafletjsComponentBehavior.init(this);
            }
        });
    </script>
</dom-module>