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<!-- Copyright (c) 2015 Google Inc. All rights reserved. -->
<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../google-apis/google-maps-api.html">
<!--
Provides the Google Maps API Directions Service to provide directions
between a `startAddress` and `endAddress`.
See https://developers.google.com/maps/documentation/javascript/directions for more
information on the API.
#### Example:
<template is="dom-bind">
<google-map-directions map="{{map}}"
start-address="San Francisco"
end-address="Mountain View"
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travel-mode="TRANSIT"
waypoints="[{location: 'Palo Alto'}, {location: 'San Mateo'}]"></google-map-directions>
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<google-map map="{{map}}" latitude="37.779"
longitude="-122.3892"></google-map>
</template>
-->
<dom-module id="google-map-directions">
<style>
:host {
display: none;
}
</style>
<template>
<google-maps-api
api-key="[[apiKey]]"
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language="[[language]]"
on-api-load="_mapApiLoaded"></google-maps-api>
</template>
</dom-module>
<script>
Polymer({
is: 'google-map-directions',
/**
Fired whenever the directions service returns a result.
@event google-map-response
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@param {{response: Object}}} detail
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*/
properties: {
/**
* A Maps API key. To obtain an API key, see developers.google.com/maps/documentation/javascript/tutorial#api_key.
*/
apiKey: String,
/**
* The Google map object.
*
* @type google.maps.Map
*/
map: {
type: Object,
observer: '_mapChanged'
},
/**
* Start address or latlng to get directions from.
*
* @type string|google.maps.LatLng
*/
startAddress: {
type: String,
value: null
},
/**
* End address or latlng for directions to end.
*
* @type string|google.maps.LatLng
*/
endAddress: {
type: String,
value: null
},
/**
* Travel mode to use. One of 'DRIVING', 'WALKING', 'BICYCLING', 'TRANSIT'.
*/
travelMode: {
type: String,
value: 'DRIVING'
},
/**
* Array of intermediate waypoints. Directions will be calculated
* from the origin to the destination by way of each waypoint in this array.
* The maximum allowed waypoints is 8, plus the origin, and destination.
* Maps API for Business customers are allowed 23 waypoints,
* plus the origin, and destination.
* Waypoints are not supported for transit directions. Optional.
*
* @type google.maps.DirectionsWaypoint
*/
waypoints: {
type: Array,
value: function() { return []; }
},
/**
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* The localized language to load the Maps API with. For more information
* see https://developers.google.com/maps/documentation/javascript/basics#Language
*
* Note: the Maps API defaults to the preffered language setting of the browser.
* Use this parameter to override that behavior.
*/
language: {
type: String,
value: null
},
/**
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* Options for the display of results
*/
rendererOptions: {
type: Object,
value: function() { return {}; }
},
/**
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* The response from the directions service.
*
*/
response: {
type: Object,
observer: '_responseChanged',
notify: true
}
},
observers: [
'_route(startAddress, endAddress, travelMode, waypoints)'
],
_mapApiLoaded: function() {
this._route();
},
_responseChanged: function() {
if (this.directionsRenderer && this.response) {
this.directionsRenderer.setDirections(this.response);
}
},
_mapChanged: function() {
if (this.map && this.map instanceof google.maps.Map) {
if (!this.directionsRenderer) {
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this.directionsRenderer = new google.maps.DirectionsRenderer(this.rendererOptions);
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}
this.directionsRenderer.setMap(this.map);
this._responseChanged();
} else {
// If there is no more map, remove the directionsRenderer from the map and delete it.
if (this.directionsRenderer) {
this.directionsRenderer.setMap(null);
this.directionsRenderer = null;
}
}
},
_route: function() {
// Abort attempts to _route if the API is not available yet or the
// required attributes are blank.
if (typeof google == 'undefined' || typeof google.maps == 'undefined' ||
!this.startAddress || !this.endAddress) {
return;
}
// Construct a directionsService if necessary.
// Wait until here where the maps api has loaded and directions are actually needed.
if (!this.directionsService) {
this.directionsService = new google.maps.DirectionsService();
}
var request = {
origin: this.startAddress,
destination: this.endAddress,
travelMode: this.travelMode,
waypoints: this.waypoints
};
this.directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
this.response = response;
this.fire('google-map-response', {response: response});
}
}.bind(this));
}
});
</script>
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