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以下是驗證具有單選按鈕，文本框和下拉列表的表單的代碼。驗證單選按鈕和文本框的JavaScript工作。但是，下拉式JavaScript不起作用。你能告訴我我做錯了什麼嗎？驗證下拉列表不起作用
請幫忙！
在此先感謝。
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function validateForm()
{
var checked = null;
var name1 = document.forms["information"]["firstname"].value;
var n=name1.split(" ");
var name = n[0];
var sex = document.forms["information"]["sex"];
var e = document.getElementById("prof1");
var strUser = e.options[e.selectedIndex].value;
var strUser1 = e.options[e.selectedIndex].text;
if(name == null || name== "")
{
alert('Enter First Name');
return false;
}
for (var i=0;i<2;i++)
{
if(sex[i].checked)
{
checked = sex[i];
return true;
}
}
if (checked == null)
{
alert(' Enter Sex');
return false;
}
if(strUser==0)
{
alert("Enter Profession");
return false;
}
}
</script>
</head>
<body>
<form name="information" onsubmit="return validateForm()" method="post">
<text style="color:red">*</text> First Name: <input type="text" name="firstname"><br><br>
Last Name: <input type="text" name="lastname"><br><br>
<text style="color:red">*</text> Sex: <input type="radio" name="sex" value="Male"> Male
<input type="radio" name="sex" value="Female"> Female <br><br>
<text style="color:red">*</text> Profession:
<select id="prof1">
<option value="0"> Select </option>
<option value="1"> Engineer </option>
<option value="2"> Doctor </option>
<option value= "3"> Lawyer </option>
<option value="4"> Others </option>
</select>
<input type="submit" value="Submit" />
</form>
</body>
</html>
上請詳細說明 「不工作」。 –