title: Setting a boolean attribute with jquery
body: <p>I understand that jquery will allow you to modify attributes with the .attr() method. There are basically two methods:</p>
  
  <pre><code>$('#element').attr('attribute', 'value') // sets the attribute
  var attribute = $('#element').attr('attribute') // gets the attribute
  </code></pre>
  
  <p>My question is, how do you set a boolean attribute such as 'checked' on a checkbox or 'multiple' on a select tag?</p>
  
  <p>I've tried doing the following without success:</p>
  
  <pre><code>$('#element').attr('attribute', true)
  $('#element').attr('attribute', '')
  </code></pre>
  
  <p>All of these add the attribute but usually like this <code>&lt;tag attribute="attribute"&gt;</code>.</p>