一种简单的JavaScript方式

var radios = document.getElementsByTagName('input');
var value;
for (var i = 0; i < radios.length; i++) {
    if (radios[i].type === 'radio' && radios[i].checked) {
        // get value, set checked flag or do whatever you need to
        value = radios[i].value;       
    }
}

表单

<form name="teenageMutant">
  <input type="radio" name="ninjaTurtles"/>
</form>

这个脚本

if(!document.teenageMutant.ninjaTurtles.checked){
  alert('get down');
}

小提琴:http://jsfiddle.net/PNpUS/

只是对马克·比克做了一点点修改;

HTML代码

<form name="frm1" action="" method="post">
  <input type="radio" name="gender" id="gender_Male" value="Male" />
  <input type="radio" name="gender" id="gender_Female" value="Female" / >
  <input type="button" value="test"  onclick="check1();"/>
</form>

和Javascript代码来检查单选按钮是否被选中

<script type="text/javascript">
    function check1() {            
        var radio_check_val = "";
        for (i = 0; i < document.getElementsByName('gender').length; i++) {
            if (document.getElementsByName('gender')[i].checked) {
                alert("this radio button was clicked: " + document.getElementsByName('gender')[i].value);
                radio_check_val = document.getElementsByName('gender')[i].value;        
            }        
        }
        if (radio_check_val === "")
        {
            alert("please select radio button");
        }        
    }
</script>

本页中的脚本帮助我想出了下面的脚本，我认为它更完整和通用。基本上，它将验证表单中的任意数量的单选按钮，这意味着它将确保为表单中的每个不同的单选组选择了一个单选选项。在下面的测试表格中:

   <form id="FormID">

    Yes <input type="radio" name="test1" value="Yes">
    No <input type="radio" name="test1" value="No">

    <br><br>

    Yes <input type="radio" name="test2" value="Yes">
    No <input type="radio" name="test2" value="No">

   <input type="submit" onclick="return RadioValidator();">

RadioValidator脚本将确保在提交之前已经为'test1'和'test2'给出了答案。您可以在表单中拥有任意多的无线电组，并且它将忽略任何其他表单元素。所有丢失的无线电答案将显示在一个单一的警告弹出。在这里，我希望它能帮助到人们。欢迎任何bug修复或有用的修改:)

<SCRIPT LANGUAGE="JAVASCRIPT">
function RadioValidator()
{
    var ShowAlert = '';
    var AllFormElements = window.document.getElementById("FormID").elements;
    for (i = 0; i < AllFormElements.length; i++) 
    {
        if (AllFormElements[i].type == 'radio') 
        {
            var ThisRadio = AllFormElements[i].name;
            var ThisChecked = 'No';
            var AllRadioOptions = document.getElementsByName(ThisRadio);
            for (x = 0; x < AllRadioOptions.length; x++)
            {
                 if (AllRadioOptions[x].checked && ThisChecked == 'No')
                 {
                     ThisChecked = 'Yes';
                     break;
                 } 
            }   
            var AlreadySearched = ShowAlert.indexOf(ThisRadio);
            if (ThisChecked == 'No' && AlreadySearched == -1)
            {
            ShowAlert = ShowAlert + ThisRadio + ' radio button must be answered\n';
            }     
        }
    }
    if (ShowAlert != '')
    {
    alert(ShowAlert);
    return false;
    }
    else
    {
    return true;
    }
}
</SCRIPT>

mootools (http://mootools.net/docs/core/Element/Element)

html:

<input type="radio" name="radiosname" value="1" />
<input type="radio" name="radiosname" value="2" id="radiowithval2"/>
<input type="radio" name="radiosname" value="3" />

js:

// Check if second radio is selected (by id)
if ($('radiowithval2').get("checked"))

// Check if third radio is selected (by name and value)
if ($$('input[name=radiosname][value=3]:checked').length == 1)


// Check if something in radio group is choosen
if ($$('input[name=radiosname]:checked').length > 0)


// Set second button selected (by id)
$("radiowithval2").set("checked", true)

该代码将在提交表单时提醒所选单选按钮。它使用jQuery来获取所选的值。

$("form").submit(function(e) { e.preventDefault(); $this = $(this); var value = $this.find('input:radio[name=COLOR]:checked').val(); alert(value); }); <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <form> <input name="COLOR" id="Rojo" type="radio" value="red"> <input name="COLOR" id="Azul" type="radio" value="blue"> <input name="COLOR" id="Amarillo" type="radio" value="yellow"> <br> <input type="submit" value="Submit"> </form>