title: Get data attribute from radio button with jQuery
body: <p>I have the following html convertd to haml:</p>
  
  <pre><code>%input#insurance_isp_payment{ checked: "checked", type: "radio", name: "insurance_isp_payment", price: 27.22, value: "single"}
  27,22 €
  </code></pre>
  
  <p>And now I want to get this price value from radio button which is checked. I tried something like that:</p>
  
  <pre><code>$('input[name=insurance_isp_payment]:checked').data("price")
  </code></pre>
  
  <p>But this not work. How can I solve this problem?</p>