How can I check whether a option already exist in select by JQuery

Question

How can I check whether a option already exist in select by JQuery?

I want to dynamically add options into select and so I need to check whether the option is alread

Answer 1

It's help me :

  var key = 'Hallo';

   if ( $("#chosen_b option[value='"+key+"']").length == 0 ){
   alert("option not exist!");

    $('#chosen_b').append(""+key+"");
    $('#chosen_b').val(key);
   $('#chosen_b').trigger("chosen:updated");
                         }
  });