OpenLayers LayerSwitcher

Grouped layer list control for an OpenLayer v3/v4 map.

All layers should have a title property and base layers should have a type property set to base. Group layers (ol.layer.Group) can be used to visually group layers together. See examples/layerswitcher.js for usage.

Examples

The examples demonstrate usage and can be viewed online thanks to RawGit:

• Basic usage
  • Create a layer switcher control. Each layer to be displayed in the layer switcher has a title property as does each Group; each base map layer has a type: 'base' property.
• Add layer
  • Add a layer to an existing layer group after the layer switcher has been added to the map.
• Scrolling
  • Demonstrate the panel scrolling vertically, control the height of the layer switcher by setting the max-height (see examples/scroll.css) and it's position relative to the bottom of the map (see the .layer-switcher.shown selector in src/ol3-layerswitcher.css).
• Browserify
  • Example of using ol3-layerswitcher with Browserify (see examples/browserify/README.md for details of building.

The source for all examples can be found in examples.

Tests

To run the tests you'll need to install the dependencies via npm. In the root of the repository run:

npm install

Then run the tests by opening test/index.html in a browser.

API

new ol.control.LayerSwitcher(opt_options)

OpenLayers v3/v4 Layer Switcher Control. See the examples for usage.

Parameters:

Name	Type	Description
opt_options	Object	Control options, extends olx.control.ControlOptions adding: tipLabel String - the button tooltip.

Extends

ol.control.Control

Methods

showPanel()

Show the layer panel.

hidePanel()

Hide the layer panel.

renderPanel()

Re-draw the layer panel to represent the current state of the layers.

setMap(map)

Set the map instance the control is associated with.

Parameters:

Name	Type	Description
map	ol.Map	The map instance.

(static) ol.control.LayerSwitcher.forEachRecursive(lyr,fn)

Static Call the supplied function for each layer in the passed layer group recursing nested groups.

Parameters:

Name	Type	Description
lyr	ol.layer.Group	The layer group to start iterating from.
fn	function	Callback which will be called for each ol.layer.Base found under lyr. The signature for fn is the same as ol.Collection#forEach

(static) ol.control.LayerSwitcher.uuid()

Generate a UUID

License

MIT (c) Matt Walker.

Also see

If you find the layer switcher useful you might also like the ol3-popup.