显示隐藏HTML5隐藏文本字段的错误

Question

如何为显示隐藏(无(的字段发出错误消息

例如：

<form>
<td style="display:none;">
<input id="put_supp" type="text" autocomplete="false" class="form-control" name="supplier[0]" placeholder=""  required>
</td>
</form>

Answer 1

更改

function myFunction() {
var x = document.getElementById("get_supp").value;
document.getElementById("put_supp").value = x;
document.getElementById("put_supp1").value = x;
}

至

function myFunction() {
var x = document.getElementById("get_supp").value;
if (x == "") { alert("PLEASE FILL OUT ALL FIELDS"); }
else {
document.getElementById("put_supp").value = x;
document.getElementById("put_supp1").value = x;
}
}