To start using the leaflet-rails gem, follow the steps below (assuming you use the default asset pipeline):
First, add the following code to your Gemfile.
gem 'leaflet-rails'Then, run bundle install from within your project to download the necessary files. Following that, open your application-wide CSS file (app/assets/stylesheets/application.css) and add the following line as a comment:
= require leaflet
After that, open your application-wide Javascript file (typically app/assets/javascripts/application.js) and add the following line before requiring files which depend on Leaflet:
= require leaflet
At this point, you may skip the first two steps of the Leaflet Quick Start guide and start at the third step (adding the map div to a view).
leaflet-rails keeps version parity with the upstream leaflet.js library. Before v0.7.7 the versions were not always in sync, as noted in the table below.
| leaflet-rails | leaflet.js | Reason |
|---|---|---|
| 0.7.4 | 0.7.3 | Requested in #33 because of large gap between master and rubygems.org. |
| 0.7.5 | 0.7.5 | leaflet.js 0.7.4 was reverted. |
| 0.7.6 | ---- | Skipped to sync with upstream. |
| 0.7.7 | 0.7.7 | Sync version numbers with upstream. |
To get you up and running quickly, you can also use the gem's helper. To get started, add the following lines to a file called leaflet.rb in config/initializers:
Leaflet.tile_layer = "http://{s}.tile.cloudmade.com/YOUR-CLOUDMADE-API-KEY/997/256/{z}/{x}/{y}.png"
# You can also use any other tile layer here if you don't want to use Cloudmade - see http://leafletjs.com/reference.html#tilelayer for more
Leaflet.attribution = "Your attribution statement"
Leaflet.max_zoom = 18If you are using a tile layer which requires non-default subdomains such as MapQuest-OSM Tiles, you can set the subdomains like this:
Leaflet.tile_layer = "http://{s}.mqcdn.com/tiles/1.0.0/map/{z}/{x}/{y}.png"
Leaflet.subdomains = ['otile1', 'otile2', 'otile3', 'otile4']You will then be able to call the #map helper method in a view, and make sure that the helper method is inside an erb tag like so:
<%= map(:center => {
:latlng => [51.52238797921441, -0.08366235665359283],
:zoom => 18
}) %>You can also add any number of markers like so:
map(:center => {
:latlng => [51.52238797921441, -0.08366235665359283],
:zoom => 18
},
:markers => [
{
:latlng => [51.52238797921441, -0.08366235665359283],
}
]
)Adding a :popup element to a marker hash will also generate a popup for a maker:
map(:center => {
:latlng => [51.52238797921441, -0.08366235665359283],
:zoom => 18
},
:markers => [
{
:latlng => [51.52238797921441, -0.08366235665359283],
:popup => "Hello!"
}
]
)If you want to override the map settings you have set in the initializer, you can also add them to the helper method:
map(:center => {
:latlng => [51.52238797921441, -0.08366235665359283],
:zoom => 18
},
:tile_layer => "http://{s}.somedomain.com/somepath/{z}/{x}/{y}.png",
:attribution => "Some other attribution text",
:max_zoom => 4
)If you want to have multiple maps on same page , you should add unique container_id in helper method for each map:
map(:container_id => "first_map", :center => {
:latlng => [51.52238797921441, -0.08366235665359283],
:zoom => 18
})
map(:container_id => "second_map", :center => {
:latlng => [51.52238797921441, -0.08366235665359283],
:zoom => 18
})
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