JavaScript表單（帶有單選按鈕）驗證不起作用
[英]Javascript form (with radio buttons) validation not working
問題描述
該代碼今天早些時候可以正常工作，然后被隨機停止，必須進行一些更改，但是我無法解決問題-請參見以下內容：
** UPDATE-下面的代碼更新。 現在，它可以正確識別是否選中了單選按鈕，但是，如果用戶在顯示警報后嘗試重新提交表單，則識別的狀態將無法更新。 是否需要某種循環？
function checkForm()
{
var x=document.forms["sdcomp"]["name"].value;
if (x==null || x=="")
{
alert("Name must be filled out");
return false;
}
var x=document.forms["sdcomp"]["email"].value;
var atpos=x.indexOf("@");
var dotpos=x.lastIndexOf(".");
if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length)
{
alert("Please enter a valid e-mail address");
return false;
}
if (document.getElementById("questionone").checked==false)
{
alert("Question one must be completed");
return false;
}
if (document.getElementById("questiontwo").checked==false)
{
alert("Question two must be completed");
return false;
}
if (document.getElementById("questionthree").checked==false)
{
alert("Question three must be completed");
return false;
}
if (document.getElementById("questionfour").checked==false)
{
alert("Question four must be completed");
return false;
}
}
表格第一個問題的示例：
<tr>
<td class="question" colspan="4"><p class="question">Usain Bolt is the current world record holder for the men's 100 meters, but what is his best time?</p></td>
</tr>
<tr>
<td class="answer">8.45 seconds<input type="radio" value="Aone" name="Qone" id="questionone"></td>
<td class="answer">9.58 seconds<input type="radio" value="Atwo" name="Qone" id="questionone"></td>
<td class="answer">10.12 seconds<input type="radio" value="Athree" name="Qone" id="questionone"></td>
<td class="answer">9.32<input type="radio" value="Afour" name="Qone" id="question one">
</td>
</tr>
** * ** 更新以下新代碼： ** * ** * ** * ** *
<link rel="stylesheet" href="style.css" type="text/css">
<!-- inclusion of fb config -->
<?php require_once('config.php'); ?>
<!-- client side validation for text fields -->
<script language="JavaScript" type="text/javascript">
function checkForm()
{
var x=document.forms["sdcomp"]["name"].value;
if (x==null || x=="")
{
alert("Name must be filled out");
return false;
}
var x=document.forms["sdcomp"]["email"].value;
var atpos=x.indexOf("@");
var dotpos=x.lastIndexOf(".");
if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length)
{
alert("Please enter a valid e-mail address");
return false;
}
/* HERE */
function isAnswered(name) {
var inputs = document.getElementsByTagName("input");
for (var i = 0; i < inputs.length; i++) {
var input = inputs[i];
if ((input.name === name) && (input.checked)) {
return true;
}
}
return false;
}
if (!isAnswered("Qone")) {
alert("Question one must be completed");
return false;
}
if (!isAnswered("Qtwo")) {
alert("Question two must be completed");
return false;
}
if (!isAnswered("Qthree")) {
alert("Question three must be completed");
return false;
}
if (!isAnswered("Qfour")) {
alert("Question four must be completed");
return false;
}
}
</script>
<?php
$con = mysql_connect("localhost","root","root");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("sdfbcomp", $con);
// some code
?>
<?php
$name = $_POST["name"];
$email = $_POST["email"];
$Qone = $_POST["Qone"];
$Qtwo = $_POST["Qtwo"];
$Qthree = $_POST["Qthree"];
$Qfour = $_POST["Qfour"];
?>
</head>
<body>
<div id="tablediv">
<table id="comptable">
<form name="sdcomp" method="post" action="insert.php" onSubmit="return checkForm();">
<tr class="userdetailfields">
<p>Name:</p><input type="text" size="12" maxlength="12" name="name"></br>
</tr>
<tr class="userdetailfields">
<p>Email:</p><input type="text" size="12" maxlength="30" name="email"></br>
</tr>
<tr>
<td class="question" colspan="4"><p class="question">Usain Bolt is the current world record holder for the men's 100 meters, but what is his best time?</p></td>
</tr>
<tr>
<td class="answer">8.45 seconds<input type="radio" value="Aone" name="Qone" id="questionone"></td>
<td class="answer">9.58 seconds<input type="radio" value="Atwo" name="Qone" id="questionone"></td>
<td class="answer">10.12 seconds<input type="radio" value="Athree" name="Qone" id="questionone"></td>
<td class="answer">9.32<input type="radio" value="Afour" name="Qone" id="question one"> </td>
</tr>
<tr>
<td class="question" colspan="4"><p class="question">Question two:</p></td>
</tr>
<tr>
<td class="answer">Answer one<input type="radio" value="Bone" name="Qtwo" id="questiontwo"></td>
<td class="answer">Answer two<input type="radio" value="Btwo" name="Qtwo" id="questiontwo"></td>
<td class="answer">Answer three<input type="radio" value="Bthree" name="Qtwo" id="questiontwo"></td>
<td class="answer">Answer four<input type="radio" value="Bfour" name="Qtwo" id="questiontwo"></td>
</tr>
<tr>
<td class="question" colspan="4"><p class="question">Question three:</td></p>
</tr>
<tr>
<td class="answer">Answer one<input type="radio" value="Cone" name="Qthree" id="questionthree"></td>
<td class="answer">Answer two<input type="radio" value="Ctwo" name="Qthree" id="questionthree"></td>
<td class="answer">Answer three<input type="radio" value="Cthree" name="Qthree" id="questionthree"></td>
<td class="answer">Answer four<input type="radio" value="Cfour" name="Qthree" id="questionthree"></td>
</tr>
<tr>
<td class="question" colspan="4"><p class="question">Question four:</td></p>
</tr>
<tr>
<td class="answer">Answer one<input type="radio" value="Done" name="Qfour" id="questionfour"></td>
<td class="answer">Answer two<input type="radio" value="Dtwo" name="Qfour" id="questionfour"></td>
<td class="answer">Answer three<input type="radio" value="Dthree" name="Qfour" id="questionfour"></td>
<td class="answer">Answer four<input type="radio" value="Dfour" name="Qfour" id="questionfour"></td>
</tr>
<tr><td><input type="submit" value="submit" name="submit" id="submit"><br /></td></tr>
</form><br />
</table>
</div>
</body>
仍然有一個問題，你能幫我嗎？ 再次感謝！
2 個解決方案
解決方案1
3 已采納 2012-06-21 08:33:35
首先，在您的問題中，所有答案都具有相同的id ='questionone'。 您需要刪除這些ID。
要檢查是否選中了特定的名稱組，可以使用：
function isAnswered(name) {
var inputs = document.getElementsByTagName("input");
for (var i = 0; i < inputs.length; i++) {
var input = inputs[i];
if ((input.name === name) && (input.checked)) {
return true;
}
}
return false;
}
然后，您可以使用以下代碼測試每個問題組：
if (!isAnswered("Qone")) {
alert("Question one must be completed");
return false;
}
解決方案2
0 2012-06-21 08:24:13
您能顯示整個表格嗎？ 同時，請嘗試以下操作：
function checkForm() {
var x=document.forms["sdcomp"]["name"].value;
if (x==null || x=="") {
alert("Name must be filled out");
return false;
}
var x=document.forms["sdcomp"]["email"].value;
var atpos=x.indexOf("@");
var dotpos=x.lastIndexOf(".");
if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length) {
alert("Please enter a valid e-mail address");
return false;
}
if (document.getElementById("questionone").checked) {
alert("Option one is selected");
} else if (document.getElementById("questiontwo").checked) {
alert("Option two is selected");
} else if (document.getElementById("questionthree").checked) {
alert("Option three is selected");
} else if (document.getElementById("questionfour").checked) {
alert("Option four is selected");
} else {
alert("No option is selected");
}
}
這就是我想要告訴您的，在您的輸入上放置唯一的ID以在函數中獲取其值：
<tr>
<td class="answer">
<label>8.45 seconds</label>
<input type="radio" value="Aone" name="Qone" id="questionone" />
</td>
<td class="answer">
<label>9.58 seconds</label>
<input type="radio" value="Atwo" name="Qtwo" id="questiontwo" />
</td>
<td class="answer">
<label>10.12 seconds</label>
<input type="radio" value="Athree" name="Qthree" id="questionthree" />
</td>
<td class="answer">
<label>9.32 seconds</label>
<input type="radio" value="Afour" name="Qfour" id="questionfour" />
</td>
</tr>
javascript 驗證表單中的單選按鈕
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