why jquery autocomplete doesnt work on https (secure pages)?

Question

I am trying to make jquery autocomplete to be work on https (secured pages) pages but its not showing any dropdown. I searched on this issue and found that its security issu

Answer 1

As I looked into the service provider they are supporting jsonp and the following sample worked

$("input").autocomplete({
    source: function (request, response) {
        $.getJSON("http://ws.geonames.org/postalCodeSearchJSON?callback=?", 
          { 'postalcode_startsWith': request.term, maxRows: 12, style: "full" }, 
          function(data) {
              if(data.postalCodes){
                  var x = $.map(data.postalCodes, function(v, i){
                      console.log(v)
                      return {
                          label: v.placeName + ' - ' + v.postalCode, 
                          v: v.postalCode
                      }
                  });
                  response(x);
              }
          }
        );        
    }
});

Demo: Fiddle