javascript - Dynamically append multiple options selected into one select jquery -


i'm trying add options selected 1 select element another. i'm guessing it'll this.

 var selected = $("#selectwithoptions").append("<option'>" +   options[selectedindex].value + "</option>");

this not work.

the logic pretty straight-forward , can follow inline comments in js function:

// fire function when dropdown item selected  $('#dd1').change(function() {    // grab text of selected item    var selectedoption = $('#dd1 :selected').text();    // if not in second dropdown list, append    if( $('#dd2 option').filter(function () { return $(this).text() == selectedoption; }).length <= 0 ) {        $('#dd2').append('<option>'+selectedoption);    }  });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <div>dropdown 1:     <select id="dd1">      <option selected disabled>select option</option>        <option>foo</option>      <option>bar</option>      <option>baz</option>      <option>xiyar</option>    </select>  </div>  <div>dropdown 2:    <select id="dd2">    </select>  </div>


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