如何获得所选单选按钮的值？

问题描述

我到处寻找并试图从一组单选按钮中获取所选值。

以下是我的HTML：

 < div id =rates > 
< input type =radioid =r1name =ratevalue =Fixed Rate>固定利率
< input type =radioid =r2name =ratevalue =Variable Rate>可变比率
< input type =radioid =r3name =ratevalue =Multi Ratechecked =checked>多利率
< / div> 
  

以下是我的.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; 
  

我一直未定义。

解决方案

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

rates元素是 div ，所以它不会有价值。这可能是 undefined 来自的地方。

已检查 $ c $> $ c $> $ if $（$ document.getElementById（'r1'）。checked）$ c $> {
rate_value = document.getElementById（'r1'）。value;
}

I looked everywhere and tried everything to get the selected value from a group of radio buttons.

Here's my 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>

Here's my .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;

I keep getting undefined.

解决方案

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

The rates element is a div, so it won't have a value. This is probably where the undefined is coming from.

The checked property will tell you whether the element is selected:

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

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