我需要有人解释一下当您单击网页底部的“重置”时，下面的代码如何将单选按钮重置为空白
如有任何帮助，我将不胜感激，我对 javascript 和 HTML 还很陌生
这里有一个 fiddle - http://jsfiddle.net/jamiepollard28/sDLV4/8/
<html>
<head>
<title>Exam entry</title>
<script language="javascript" type="text/javascript">
window.onload=function(){
window.validateForm=function() {
var result = true;
var msg = "";
var focusname="";
if (document.ExamEntry.name.value == "") {
msg += "You must enter your name \n";
focusname="name";
//document.ExamEntry.name.focus();
document.getElementById('name1').style.color = "red";
//result = false;
}
if (document.ExamEntry.subject.value == "") {
msg += "You must enter the subject \n";
// document.ExamEntry.subject.focus();
if (focusname=="")
{
focusname="subject";
}
document.getElementById('subject1').style.color = "red";
//result = false;
}
var Number = document.ExamEntry.Exam_Number.value
if (Number == "") {
msg += "You must enter the exam Number \n";
//document.ExamEntry.Exam_Number.focus();
if (focusname=="")
{
focusname="Exam_Number";
}
document.getElementById('Exam_Number1').style.color = "red";
//result = false;
}else if (Number.length != 4) {
msg += "You must enter at least Four Numbers in the Exam Number \n";
if (focusname=="")
{
focusname="Exam_Number";
}
//document.ExamEntry.Exam_Number.focus();
document.getElementById('Exam_Number1').style.color = "red";
//result = false;
}
else if (isNaN(Number)) {
msg += "You must enter at least four numeric characters in the Exam Number feild \n";
if (focusname=="")
{
focusname="Exam_Number";
}
// document.ExamEntry.Exam_Number.focus();
document.getElementById('Exam_Number1').style.color = "red";
//result = false;
}
var valchecked = '';
var len = document.getElementsByName('examtype').length;
for (i = 0; i < len; i++) {
if ( document.ExamEntry.examtype[i].checked ) {
valchecked = document.ExamEntry.examtype[i].value;
break;
}
}
if (valchecked == '') {
msg += "Select Exam Type";
document.getElementById('Exam_Type').style.color = "red";
if (focusname=="")
{
focusname="examtype_GCSE";
}
}
if (msg != ""){
alert(msg)
document.getElementById(focusname).focus();
return false;
}else{
return confirm('You have chosen ' + valchecked + ' is this correct?');
}
}
}//]]>
</script>
</head>
<body>
<h1>Exam Entry Form</h1>
<form name="ExamEntry" method="post" action="success.html">
<table width="50%" border="0">
<tr>
<td id="name1">Name</td>
<td><input type="text" name="name" id="name" /></td>
</tr>
<tr>
<td id="subject1">Subject</td>
<td><input type="text" name="subject" id="subject"/></td>
</tr>
<tr>
<td id="Exam_Number1">Exam Number</td>
<td><input type="text" name="Exam_Number" id="Exam_Number" ><font size="3">(Maximum characters: 4)</font> </td>
</tr>
<tr>
<table><form action="">
<td id="Exam_Type">Exam Type</td>
<tr><td><input type="radio" id="examtype_GCSE" name="examtype" value="GCSE" /> : GCSE<br /></tr>
<tr><td><input type="radio" id="examtype_AS" name="examtype" value="AS"/> : AS<br /></tr>
<tr><td><input type="radio" id="examtype_A2" name="examtype" value="A2" /> : A2<br /></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>
</body>
</html>
最佳答案
<input type="reset" />是 HTML 表单的内置功能。它将简单地清除或形成字段并将其他控件设置回默认值。
关于javascript - 解释一下部分代码，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22245723/