jQuery show in one list that is selected in another

Hello, I have two multi select lists on a page that contain countries.  ListA and ListB  are populated with the countries.

In ListA the user selects only USA and Canada. Now in ListB I want to only show the countries selected in ListA.

How do you do that in jQuery
Scott BaldridgeAsked:
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Alexandre SimõesManager / Solutions ArchitectCommented:
Something like this?

$(document).ready(function() {
  var countries = ['USA', 'Canada', 'Portugal', 'Spain', 'France'],
    $sel1 = $('#sel1'),
    $sel2 = $('#sel2');

  var populateSelect = function($sel, options) {
    var html = '';
    for (var c = 0; c < options.length; c++) {
      html += '<option value="' + options[c] + '">' + options[c] + '</option>';


  $sel1.on('change', function() {

    var sel2Options = [];
    $sel1.find(':selected').each(function(i, selected) {

    populateSelect($sel2, sel2Options);

  populateSelect($sel1, countries);


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<select id="sel1" multiple></select>
<select id="sel2" multiple></select>

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Scott BaldridgeAuthor Commented:
Thank you! That was the nudge I needed.
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