Ajax的把手按钮ID

Imagine I have a handlebar template like this:

       {{#each this}}
           {{username}}
           <form method="post" id="form-id-{{tirID}}">
              <input type="button" id="btn-id-{{tirID}}">
           </form>
       {{/each}}

This one loops through data and works great with AJAX get method. However I would like to also use the button inside this template. I can give it a ID like I do above in the template. But how can I target the specific button to activate a AJAX post method ? The following wont work because I am not operating in the template anymore so {{ x }} can not be found:

       $('#btn-id-{{tirID}}').on('click', '.mydiv', function(event) {

           $.ajax({
                 type:'POST',
                 url: 'and so on....

       } 

Hope someone have a suggestion!