n</a></code> - in case the event source has already been opened earlier.</dd>
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<h3><a id="isOpen()">isOpen</a></h3>
<div class="memberSignature"><span class="returnType">boolean</span>&nbsp;<span class="memberName">isOpen</span>()</div>
<div class="block">Check if this event source instance has already been <a href="#open()"><code>opened</code></a>.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if thi