使用Javascript验证单选按钮
[英]Validation of radio buttons with Javascript
问题描述
I've combed a ton of the pages on here, and still am incapable to get my explicit validator to work. 
我已经在这里梳理了大量的页面，但仍然无法让我的显式验证器工作。 Basically, when the submit button is clicked, I want the script to verify a radio is checked, if one is checked to do nothing. 基本上，当单击提交按钮时，我希望脚本验证是否检查了无线电，如果检查了无线电。 If one isn't checked I want it to post an alert message. 如果未选中，我希望它发布警报消息。
roughly my html looks like: 大致我的HTML看起来像：
<form id="myForm" onsubmit = "check()">
<input type = "radio" name = "c" id = "1" value = "1" />
<input type = "radio" name = "c" id = "2" value = "2" />
<input type = "radio" name = "c" id = "3" value = "3" />
<input type = "submit" value = "Submit" />
my JS page looks like: 我的JS页面看起来像：
function check() {
var r = document.getElementsByName("c")
var c = 0
for(var i=0; i < r.length; i++){
if(c[i].checked) {
c = i; }
}
alert("please select radio");
}
5 个解决方案
解决方案1
4 2013-02-08 20:03:35
try this one 试试这个
function check() {
var r = document.getElementsByName("c")
var c = -1
for(var i=0; i < r.length; i++){
if(r[i].checked) {
c = i;
}
}
if (c == -1) alert("please select radio");
}
解决方案2
1 2013-02-08 20:01:54
this 这个
c[i].check
should be 应该
c[i].checked
and you're not actually doing anything with the result, you're just always alerting. 而你实际上并没有对结果做任何事情，你只是总是提醒你。
解决方案3
0 2013-02-08 20:52:27
<html>
<head>
<script language="javascript">
function check() {
chosen = ""
len = document.myform.chk.length
for (i = 0; i <len; i++) {
if (document.myform.chk[i].checked) {
chosen = document.myform.chk[i].value
}
}
if (chosen == "") {
alert("No Option selected");
return false;
}
else {
alert("option selected");
return true;
}
}
</script>
</head>
<body>
<form name="myform" onsubmit = "return check();">
<input type = "radio" name = "chk" id = "1" value = "1" >
<input type = "radio" name = "chk" id = "2" value = "2" >
<input type = "radio" name = "chk" id = "3" value = "3" >
<input type="submit" value="submit">
</form>
</body>
</html>
Check for this validation hope its may also help you . 检查此验证希望它也可以帮助您。 Also check it in jsfiddle 还可以在jsfiddle中查看
解决方案4
0 2013-10-31 10:45:19
function ShowMsg() {
if (fnSpeciality() == false)
{
document.getElementById("myform").focus();
return false;
}
function fnSpeciality()
{
return fnRblfnSpeciality();
}
function fnSpeciality() {
return fnRblfnSpeciality();
}
function fnRblfnSpeciality() {
var list = document.getElementById('myform'); //Client ID of the radiolist
var inputs = list.getElementsByTagName("input");
var isItemChecked = false;
for (var i = 0; i < inputs.length; i++) {
var listItem = inputs[i];
if (listItem.checked) {
//alert(listItem.value);
isItemChecked = true;
break;
}
}
if (isItemChecked == false) {
if (isItemChecked =="") {
alert('Please select a speciality.');
return false;
}
// else return true;
}
return true;
}
解决方案5
-1 2015-10-07 09:20:01
CreditCard DebitCard By Cash CreditCard DebitCard现金
</td>
</tr>
Am using radio button list ..pls share if have java script validation for this radio button 使用单选按钮列表..pls共享如果有此单选按钮的java脚本验证
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