Stack Overflow answer Jquery

by lopisan

HTML

<select id="a">
    <option value="1">one</option>
    <option value="2">two</option>
    <option value="3">three</option>
</select>
<select id="b">
    <option value="1">one</option>
    <option value="2">two</option>
    <option value="3">three</option>
</select>
<button id="switch">Switch</button>

JavaScript

$("#switch").click(function(){
    var valA = $("#a").val();
    var valB = $("#b").val();
    $("#a").val(valB);
    $("#b").val(valA);
});