javascript if else statement

 <script type="text/javascript">

    function ShowHideDiv() {

        var approvalatt = document.getElementById("approvalatt");

        var Attachmail = document.getElementById("Attachmail");

        if (approvalatt.value === "No"){

        Attachmail.style.display = "block";

        }else {

        Attachmail.style.display = "none";

    }

    }

</script>



This section will work on java script 

<select class="form-select rounded-pill bg-light" aria-label="approvalatt" name="approvalatt" id="approvalatt" onchange=ShowHideDiv() required>

                        <option value="No" selected>No</option>

                        <option value="Yes">Yes</option>

                        </select>


Demo

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