datalets/leafletjs-datalet/leafletjs-datalet.html

<!--
@license
    The MIT License (MIT)

    Copyright (c) 2015 Dipartimento di Informatica - Università di Salerno - Italy

    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.
-->

<!--
* 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">

<!--

`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=#"
        fields='["field1","field2"]'>
    </leafletjs-datalet>

@element leafletjs-datalet
@status v0.1
@demo demo/index.html
@group datalets
-->

<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-alasql-datalet data-url="{{dataUrl}}" fields="{{fields}}" data="{{data}}" title="{{title}}" description="{{description}}"></base-ajax-json-alasql-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
             */
            presentData: function(){

                var t = this;
                try{
                    this._component.map = L.map(this._component.$.leafletjs).setView([0, 0], 13, {reset:true});
                }catch(e){}


                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._component.map);


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

                var coordinates = [];
                var isArray = t.data[0].data[0].constructor === Array;

                for(var i=0; i<t.data[0].data.length; i++)
                {
                    if(isArray)
                        coordinates.push([parseFloat(t.data[0].data[i][0]), parseFloat(t.data[0].data[i][1])]);
                    else
                        coordinates.push([parseFloat(t.data[0].data[i]), parseFloat(t.data[1].data[i])]);

                    var marker = L.marker([coordinates[i][0], coordinates[i][1]]).addTo(t._component.map);

                    if(t.data.length > 2)
                    {
                        var popupText = "";
                        for(var j=2; j<t.data.length; j++)
                        {
                            if(t.data[j].data[i].toString().match(new RegExp("^(http[s]?:\\/\\/(www\\.)?|ftp:\\/\\/(www\\.)?|www\\.){1}([0-9A-Za-z-\\.@:%_\+~#=]+)+((\\.[a-zA-Z]{2,3})+)(/(.)*)?(\\?(.)*)?")))
                                    popupText += '<image height="100" width="100" src="' + t.data[j].data[i] + '" /><br/>';
                            else
                                    popupText += '<span>' + t.data[j].data[i] + '</span><br/>'
                        }

                        var popup = L.popup().setContent(popupText);
                        marker.bindPopup(popup);
                    }
                }

                t._component.map._onResize();
                t._component.map.invalidateSize(false);
                t._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 : []
                },
                /**
                 * It's the component behavior
                 *
                 * @attribute behavior
                 * @type Object
                 * @default {}
                 */
                behavior : {
                    type : Object,
                    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.behavior =  $.extend(true, {}, BaseDataletBehavior, WorkcycleBehavior, AjaxJsonAlasqlBehavior, leafletjsBehavior);
                this.async(function(){this.behavior.init(this)},100);
            }
        });
    </script>
</dom-module>