如何获取所选单选按钮的值?

我想从一组单选按钮中获得选定的值。

这是我的HTML:

<div id="rates">
  <input type="radio" id="r1" name="rate" value="Fixed Rate"> Fixed Rate
  <input type="radio" id="r2" name="rate" value="Variable Rate"> Variable Rate
  <input type="radio" id="r3" name="rate" value="Multi Rate" checked="checked"> Multi Rate  
</div>

这是我的js:

var rates = document.getElementById('rates').value;
var rate_value;
if(rates =='Fixed Rate'){
    rate_value = document.getElementById('r1').value;
    
}else if(rates =='Variable Rate'){
    rate_value = document.getElementById('r2').value;
    
}else if(rates =='Multi Rate'){
    rate_value = document.getElementById('r3').value;
}  

document.getElementById('results').innerHTML = rate_value;

我一直没有定义。

当前回答

https://codepen.io/anon/pen/YQxbZJ

HTML

<div id="rates">
<input type="radio" id="x1" name="rate" value="Fixed Rate"> Fixed Rate
<input type="radio" id="x2" name="rate" value="Variable Rate" 
checked="checked"> Variable Rate
<input type="radio" id="x3" name="rate" value="Multi Rate" > Multi Rate
</div>

<button id="rdio"> Check Radio </button>
<div id="check">

</div>

JS的

var x ,y;
var x = document.getElementById("check");
function boom()
{
if (document.getElementById("x1").checked)
  y = document.getElementById("x1").value;

else if(document.getElementById("x2").checked)
  y = document.getElementById("x2").value;

else if (document.getElementById("x3").checked)
  y = document.getElementById("x3").value;
else
  y = "kuch nhi;"
x.innerHTML = y;
}

var z = document.getElementById('rdio');
z.addEventListener("click", boom);`

2017-06-24 12:54:21

其他回答

您可以使用checked属性来获取该值。

var rates = document.getElementsByName('rate');
var rate_value;
for(var i = 0; i < rates.length; i++){
    if(rates[i].checked){
        rate_value = rates[i].value;
    }
}

2013-04-05 16:48:22

HTML代码:

<输入类型=“无线电” 名称=“rdoName” 值=“是”/> <输入类型=“无线电” 名称=“rdoName” 值=“NO”/>

JQUERY代码:

var value= $("input:radio[name=rdoName]:checked").val();

$（“#btnSubmit”）.click（function（）{ var value=$（“input：radio[name=rdoName]：checked”）.val（）; 控制台.log（值）; 警报（值）; }) <script src=“https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js”></script> <输入类型=“无线电” 名称=“rdoName” 值=“是”/> 是 <输入类型=“无线电” 名称=“rdoName” 值=“否”/> 否 <br/> <input type=“button”id=“btnSubmit”value=“哪一个选择了”/>

你会得到

value="YES" //if checked Radio Button with the value "YES"
value="NO" //if checked Radio Button with the value "NO"

2018-05-25 12:49:33

var rates = document.getElementById('rates').value;

rates元素是一个div，所以它没有值。这可能就是未定义的来源。

checked属性会告诉你元素是否被选中:

if (document.getElementById('r1').checked) {
  rate_value = document.getElementById('r1').value;
}

$("input[type='radio'][name='rate']:checked").val();

2013-04-05 16:50:19

https://codepen.io/anon/pen/YQxbZJ

HTML

<div id="rates">
<input type="radio" id="x1" name="rate" value="Fixed Rate"> Fixed Rate
<input type="radio" id="x2" name="rate" value="Variable Rate" 
checked="checked"> Variable Rate
<input type="radio" id="x3" name="rate" value="Multi Rate" > Multi Rate
</div>

<button id="rdio"> Check Radio </button>
<div id="check">

</div>

JS的

var x ,y;
var x = document.getElementById("check");
function boom()
{
if (document.getElementById("x1").checked)
  y = document.getElementById("x1").value;

else if(document.getElementById("x2").checked)
  y = document.getElementById("x2").value;

else if (document.getElementById("x3").checked)
  y = document.getElementById("x3").value;
else
  y = "kuch nhi;"
x.innerHTML = y;
}

var z = document.getElementById('rdio');
z.addEventListener("click", boom);`

2017-06-24 12:54:21

你可以使用.find()来选择选中的元素:

var radio = Array.from(document.querySelectorAll('#rate input'))

var value = radio.length && radio.find(r => r.checked).value

2016-10-18 11:16:07

如何获取所选单选按钮的值?

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