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    dhtmlxmenu:event_oncheckboxclick    [DHX documentation]
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<h2><a name="oncheckboxclick_event" id="oncheckboxclick_event">onCheckboxClick Event</a></h2>
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<p>

By default this event changes the state of the clicked checkbox item. The visible sub-polygon won&#039;t be hidden after this action.
onCheckboxClick event can call user-defined handler (if there is any) and pass the following parameters:
</p>
<ul>
<li class="level1"><div class="li">  id - id of the clicked checkbox item;</div>
</li>
<li class="level1"><div class="li">  state - state of the clicked checkbox item. Defines whether the item is checked or not;</div>
</li>
<li class="level1"><div class="li">  zoneId (only for Contextual Menu) - id of the contextual menu zone;</div>
</li>
<li class="level1"><div class="li">  casState - whether the key “Ctrl”, “Alt”, or “Shift” was pressed with click or not.</div>
</li>
</ul>
<pre class="code javascript">        menu.<span class="me1">attachEvent</span><span class="br0">&#40;</span><span class="st0">&quot;onCheckboxClick&quot;</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">&#40;</span>id<span class="sy0">,</span> state<span class="sy0">,</span> zoneId<span class="sy0">,</span> casState<span class="br0">&#41;</span><span class="br0">&#123;</span>
            ...
            <span class="co1">// user-defined handler</span>
            <span class="co1">// ctrl</span>
            <span class="kw1">if</span> <span class="br0">&#40;</span>casState<span class="br0">&#91;</span><span class="st0">&quot;ctrl&quot;</span><span class="br0">&#93;</span> <span class="sy0">==</span> <span class="kw2">true</span><span class="br0">&#41;</span> <span class="br0">&#123;</span>
                    <span class="co1">// ctrl key was pressed with click</span>
            <span class="br0">&#125;</span> <span class="kw1">else</span> <span class="br0">&#123;</span>
                    <span class="co1">// ctrl key was not pressed with click</span>
            <span class="br0">&#125;</span>
            <span class="co1">// alt</span>
            <span class="kw1">if</span> <span class="br0">&#40;</span>casState<span class="br0">&#91;</span><span class="st0">&quot;alt&quot;</span><span class="br0">&#93;</span> <span class="sy0">==</span> <span class="kw2">true</span><span class="br0">&#41;</span> <span class="br0">&#123;</span>
                    <span class="co1">// alt key was pressed with click</span>
            <span class="br0">&#125;</span> <span class="kw1">else</span> <span class="br0">&#123;</span>
                    <span class="co1">// alt key was not pressed with click</span>
            <span class="br0">&#125;</span>
            <span class="co1">// shift</span>
            <span class="kw1">if</span> <span class="br0">&#40;</span>casState<span class="br0">&#91;</span><span class="st0">&quot;shift&quot;</span><span class="br0">&#93;</span> <span class="sy0">==</span> <span class="kw2">true</span><span class="br0">&#41;</span> <span class="br0">&#123;</span>
                    <span class="co1">// shift key was pressed with click</span>
            <span class="br0">&#125;</span> <span class="kw1">else</span> <span class="br0">&#123;</span>
                    <span class="co1">// shift key was not pressed with click</span>
            <span class="br0">&#125;</span>
            <span class="kw1">return</span> <span class="kw2">true</span>;
        <span class="br0">&#125;</span><span class="br0">&#41;</span>;</pre>
<p>
When the user attaches a user-defined handler to this event, the state of the item can no longer be changed automatically. The user can control this by returning true|false from a user-defined handler. That&#039;s why, return true should be added after a user-defined handler in order to let the script know that the state of the item should be changed.

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