JSFiddle - React, Tailwind, and code Playground

by dactivo

HTML

<select id="1">
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="mercedes">Mercedes</option>
</select>

<select id="2">
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="mercedes">Mercedes</option>
</select>

JavaScript

$("select").change(function()
 {

        $("select option").attr("disabled",""); //enable everything
     
     //collect the values from selected;
     var  arr = $.map
     (
        $("select option:selected"), function(n)
         {
              return n.value;
          }
      );
    

    $("select option").filter(function()
    {
             
        return $.inArray($(this).val(),arr)>-1;
     }).attr("disabled","disabled");   

});