我正在处理一份HTML文档,这是一份考试提交表单。我已经完成了几乎所有的设置任务,但是我在验证单选按钮时遇到了问题。我搜索了stackoverflow但是,答案不符合问题的标准。我完成的代码如下所示。
我在完成这项任务的大胆部分时遇到了麻烦:
向表单添加一组单选按钮以接受GCSE,AS或A2等条目。 编写一个功能,在警告框中显示用户的输入级别,以便确认或拒绝级别。
以下代码正常工作,不包括单选按钮的验证。 Seperatley,我的代码在函数validateForm()中实现时不起作用。
<html>
<head>
<title>Exam entry</title>
<script language="javascript" type="text/javascript">
function validateForm() {
var result = true;
var msg = "";
if (document.ExamEntry.name.value == "") {
msg += "You must enter your name \n";
document.ExamEntry.name.focus();
document.getElementById('name').style.color = "red";
result = false;
}
if (document.ExamEntry.subject.value == "") {
msg += "You must enter the subject \n";
document.ExamEntry.subject.focus();
document.getElementById('subject').style.color = "red";
result = false;
}
if (document.ExamEntry.examno.value == "") {
msg += "You must enter your Examination Number \n";
document.ExamEntry.examno.focus();
document.getElementById('examinationno').style.color = "red";
result = false;
}
if (document.ExamEntry.examno.value.length!== 4) {
msg+="Your Examination Number should be 4 digits.\n";
document.ExamEntry.examno.focus();
document.getElementById('examinationno').style.color="red";
result = false;
}
if(msg==""){
return result;
}
{
alert(msg)
return result;
}
}
</script>
</head>
<body>
<h1>Exam Entry Form</h1>
<form name="ExamEntry" method="post" action="success.html">
<table width="50%" border="0">
<tr></tr>
<tr>
<td id="name">Name</td>
<td>
<input type="text" name="name" />
</td>
</tr>
<tr>
<td id="subject">Subject</td>
<td>
<input type="text" name="subject" />
</td>
</tr>
<tr>
<td id="examinationno">Examination Number</td>
<td>
<input type="text" name="examno" />
</td>
</tr>
<tr>
<td>
<input type="radio" name="examtype" value="GCSE" />GCSE</td>
</tr>
<tr>
<td>
<input type="radio" name="examtype" value="AS" />AS</td>
</tr>
<tr>
<td>
<input type="radio" name="examtype" value="A2" />A2</td>
</tr>
<tr>
<td>
<input type="submit" name="Submit" value="Submit" onClick="return validateForm();" />
</td>
<td>
<input type="reset" name="Reset" value="Reset" />
</td>
</tr>
</table>
</form>
根据当前代码,为什么在添加到函数中时不会进行以下验证?:
if(document.getElementById('GCSE').checked)
{examtype = "GCSE";
}
if(document.getElementById('AS').checked)
{examtype = "AS";
}
if(document.getElementById('A2').checked)
{examtype = "A2";
}
if(confirm("You have selected"+examtype+.Continue?")){
if(msg==""){
return result;
}
{
alert(msg)
return result;
}
}
else{
alert("Action cancelled");
return false;
}
答案 0 :(得分:0)
// Retrieving the checked radio button value
function getRadioValue (frmName, rbGroupName)
{
var radios = document[frmName].elements[rbGroupName];
for (var i=0; i <radios.length; i++)
{
if (radios[i].checked)
{
return radios[i].value;
}
}
return false;
}
在 validateForm()
中调用 getRadioValue() // examtype gets false or GCSE or AS or A2
var examtype = getRadioValue ("ExamEntry", "examtype");
答案 1 :(得分:0)
“继续”是一个关键字。所以你必须将它包装在撇号(“)中。我无法得到if语句的结构,我做了一些修改。我希望这就是你要找的......
if(confirm("You have selected"+examtype+". Continue?")){
if(msg==""){
alert(msg);
return result;
}
else{
alert("Action cancelled");
return false;
}
}