JSFiddle - React, Tailwind, and code Playground

HTML

<html>
<body>
<form name="form1">
<select name="select1">
<option value="p1">p1</option>
<option value="p2">p2</option>
</select>
</form>


<script type="text/javascript">
    window.onload = function () {
        document.getElementsByName("select1")[0].onchange = function () {
            var sel = this.options[this.selectedIndex];
            var text = sel.text;
            var val = sel.value;
            
            switch (val)
            {
              case 'p1': window.location = 'http://www.yahoo.com'
                        break;
              case 'p2': window.location = 'http://www.google..com'
                        break;
            }
        }
    }
</script>
<p>Set the variable to different value and then try...</p>
</body>
</html>