title: How to get an EmberJs checkbox to send an action with multiple parameters
body: <p>How do you get a checkbox using the <code>{{input}}</code> helper in EmberJs to send an action with multiple parameters?</p>
  
  <p>Here is the current template:</p>
  
  <pre><code>&lt;input
    type="checkbox" 
    class="t-dtd-field-checkbox" 
    checked="checked" 
    {{action "updateRequest" option field ticket}}
  &gt;
  </code></pre>
  
  <p>I'd like to do something like this:</p>
  
  <pre><code>{{input
    type="checkbox" 
    class="t-dtd-field-checkbox" 
    checked={{option.checked}} 
    {{action "updateRequest" option field ticket}}
  }}
  </code></pre>
  
  <p>However, this is causing a syntax error, and not sure how to get the syntax correct?</p>
  
  <p>Also, how do you get the checkbox's value to update in the DOM on keypress?</p>
  
  <p>Thanks in advance!</p>