Label">Returns:</span></dt>
<dd>script that provides the client-side behavior, or null if no script is required.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang" class="externalLink">NullPointerException</a></code> - if <code>behaviorContext</code> is <code>null</code></dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2