title: check checkbox by clicking button
body: <p>I got a problem with checking checkboxes by clicking a separate button. For example I want to check the Mercedes SLK checkbox by clicking the button unterneath. How can I implement that?</p>
  
  <p>Thanks in advance for your feedbacks.</p>
  
  <p>Example code:</p>
  
  <pre><code>&lt;form action=""&gt;
  &lt;input type="checkbox" name="vehicle" value="volvo"&gt;Volvo XC90&lt;br&gt;
  &lt;input type="checkbox" name="vehicle" value="bmw"&gt;BMW 325i&lt;br&gt; 
  &lt;input type="checkbox" name="vehicle" value="mercedes"&gt;Mercedes SLK
  &lt;/form&gt;
  &lt;button type="button"&gt;Check Mercedes SLK&lt;/button&gt; 
  </code></pre>