open-map/open-circle.html at master · tdtm/open-map · GitHub

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<polymer-element name="open-circle"
  attributes="latitude longitude radius">
  <template>
    <style>
      :host{
        display: none;
      }
    </style>
  </template>
  <script>
    (function(){
      'use strict';
      Polymer({
        map: null,
        latitude: null,
        longitude: null,
        radius: null,
        circle: null,
        observe:{
          latitude: 'updateCircle',
          longitude: 'updateCircle',
          radius: 'updateCircle',
        },

        created: function(){
          this.opts = {};
        },

        renderCircle: function(){
          this.circle = L.circle([Number(this.latitude),
                                  Number(this.longitude)],
                                  Number(this.radius), this.opts)
                                  .addTo(this.map);
        },

        updateCircle: function(){
          var canUpdate = this.map &&
              this.latitude &&
              this.longitude &&
              this.radius;
          if(this.circle) { this.removeLayer(true); }
          if(canUpdate) { this.renderCircle(); }
        },
        removeLayer: function(keep){
          this.map.removeLayer(this.circle);
          if(!keep) { this.remove(); }
        }
      });
    })();
  </script>
</polymer-element>