Check if value is in select list with JQuery

Question

How can I, using JQuery, check if a value belongs to dropdown list or not?

Answer 1

Just in case you (or someone else) could be interested in doing it without jQuery:

var exists = false;
for(var i = 0, opts = document.getElementById('select-box').options; i < opts.length; ++i)
   if( opts[i].value === 'bar' )
   {
      exists = true; 
      break;
   }