---
layout: example.html
title: Lazy Source
shortdesc: Example of setting a layer source after construction.
docs: >
  <p>Typically, the source for a layer is provided to the layer constructor.
  If you need to set a layer source after construction, this can be
  done with the <code>layer.setSource()</code> method.</p>
  <p>The layer in the map above is constructed with no source.  Use the
  links below to set/unset the layer source.  A layer is not rendered
  until its source is set.</p>
tags: "source"
---
<div id="map" class="map"></div>
<button id="set-source" class="code">layer.setSource(source)</button>
<button id="unset-source" class="code">layer.setSource(null)</button>