How to assign an event handler to proto.io on/off switch?
<p>Proto.io has a great solution for on/off switches and they're super easy to use. However, I'm having trouble figuring out how I add an event handler to the switch after I click it. Specifically, I'm asking how to determine the state that the switch is in after I click it.</p>

<p>I've tried checking the state of the <code>&lt;input&gt;</code> element checkbox but it doesn't seem to change using proto.io.</p>

<p><strong>HTML and CSS follow:</strong></p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>.onoffswitch {
    position: relative; width: 90px;
    -webkit-user-select:none; -moz-user-select:none; -ms-user-select: none;
}
.onoffswitch-checkbox {
    display: none;
}
.onoffswitch-label {
    display: block; overflow: hidden; cursor: pointer;
    border: 2px solid #999999; border-radius: 20px;
}
.onoffswitch-inner {
    display: block; width: 200%; margin-left: -100%;
    transition: margin 0.3s ease-in 0s;
}
.onoffswitch-inner:before, .onoffswitch-inner:after {
    display: block; float: left; width: 50%; height: 30px; padding: 0; line-height: 30px;
    font-size: 14px; color: white; font-family: Trebuchet, Arial, sans-serif; font-weight: bold;
    box-sizing: border-box;
}
.onoffswitch-inner:before {
    content: "ON";
    padding-left: 10px;
    background-color: #34A7C1; color: #FFFFFF;
}
.onoffswitch-inner:after {
    content: "OFF";
    padding-right: 10px;
    background-color: #EEEEEE; color: #999999;
    text-align: right;
}
.onoffswitch-switch {
    display: block; width: 18px; margin: 6px;
    background: #FFFFFF;
    position: absolute; top: 0; bottom: 0;
    right: 56px;
    border: 2px solid #999999; border-radius: 20px;
    transition: all 0.3s ease-in 0s; 
}
.onoffswitch-checkbox:checked + .onoffswitch-label .onoffswitch-inner {
    margin-left: 0;
}
.onoffswitch-checkbox:checked + .onoffswitch-label .onoffswitch-switch {
    right: 0px; 
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="onoffswitch"&gt;
  &lt;input type="checkbox" name="onoffswitch" class="onoffswitch-checkbox" id="myonoffswitch" checked&gt;
  &lt;label class="onoffswitch-label" for="myonoffswitch"&gt;
    &lt;span class="onoffswitch-inner"&gt;&lt;/span&gt;
    &lt;span class="onoffswitch-switch"&gt;&lt;/span&gt;
  &lt;/label&gt; 
&lt;/div&gt;</code></pre>
</div>
</div>
</p>

<p>Thanks!</p>