CODEWITHSUNDEEP
javascripthtmlradio-button
ZombieBatman
ZombieBatman

Reputation: 4883

How to get the value of a selected radio button

I want 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 JavaScript code:

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.

Upvotes: 488

Views: 1774275

Answers (28)

P.Tsiros
P.Tsiros

Reputation: 11

if you want to know which radio is checked and which unchecked to take some actions ...

<input type="radio" id="a" onclick="changed(this)" name="radios" >one
<input type="radio" id="b" onclick="changed(this)" name="radios">two
<input type="radio" id="c" onclick="changed(this)" name="radios" >three
<input type="radio" id="d" onclick="changed(this)" name="radios" checked>four

radios = document.getElementsByName("radios")
var temp = setit()

function setit(){
    var tmp = null
    for (i=0;i<radios.length;++i)
        if (radios[i].checked)
            tmp=radios[i].id
    return tmp
}

function changed(obj){
    if(temp != obj.id){
        if(temp)
            previous(temp)
        current(obj.id)
        temp=obj.id
    }
}

function previous(id){
    alert("unchecked "+id)
}

function current(id){
    alert("checked "+id)
}

Upvotes: 0

JHS
JHS

Reputation: 1428

Another (apparently older) option to retrieve the value is to use the format: "document.forms.nameOfTheForm.nameOfTheInput.value;" e.g. document.forms.mainForm.rads.value;

document.mainForm.onclick = function(){
    var radVal = document.forms.mainForm.rads.value;
    result.innerHTML = 'You selected: '+radVal;
}
<form id="mainForm" name="mainForm">
    <input type="radio" name="rads" value="1" />
    <input type="radio" name="rads" value="2" />
    <input type="radio" name="rads" value="3" />
    <input type="radio" name="rads" value="4" />
</form>
<span id="result"></span>

You can refer to the element by its name within a form. Your original HTML does not contain a form element though.

ref: Document: forms property - Web APIs | MDN

Fiddle here (works in Chrome and Firefox): https://jsfiddle.net/Josh_Shields/23kg3tf4/1/

Upvotes: 18

Daniel
Daniel

Reputation: 5024

RadioNodeList is now supported by all major browsers.

Accessing its value property will return the value of the currently checked input. This will remove the necessity of first filtering out the 'checked' input as we see in many of the posted answers.

Example Form

<form id="test">
    <label><input type="radio" name="test" value="A"> A</label>
    <label><input type="radio" name="test" value="B" checked> B</label>
    <label><input type="radio" name="test" value="C"> C</label>
</form>

To retrieve the checked value, you could do something like this:

var form = document.getElementById("test");
alert(form.elements["test"].value);

The JSFiddle to prove it: http://jsfiddle.net/vjop5xtq/

Please note this was implemented in Firefox 33 (all other major browser seems to support it). Older browsers will require a polyfill for RadioNodeList for this to properly function.

Upvotes: 59

Wadih M.
Wadih M.

Reputation: 13452

If you don't want it to fail if no value is checked yet, you can use the Optional chaining operator ?.:

document.querySelector('input[name="rate"]:checked')?.value

Optional chaining operator works in 92.35% of the browsers as per writing of this post August 22 2023 as per caniuse.

Upvotes: 5

user8590818
user8590818

Reputation:

HTML code

<input type="radio" name="rdoName" value="YES"/>
<input type="radio" name="rdoName" value="NO"/>

jQuery code

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


$("#btnSubmit").click(function() {
    var value = $("input:radio[name=rdoName]:checked").val();
    console.log(value);
    alert(value);
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="radio" name="rdoName" value="YES"/> YES
<input type="radio" name="rdoName" value="NO"/> NO
<br/>
<input type="button"id="btnSubmit"value="Which one Selected"/>

You will get

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

Upvotes: 11

Beweelam
Beweelam

Reputation: 1126

If you are using JavaScript without jQuery, you can use this command:

document.querySelector("input[type='radio'][name=rate]:checked").value;

Upvotes: 41

pongi
pongi

Reputation: 399

My take on this problem with pure JavaScript is to find the checked node, find its value and pop it out from the array.

var Anodes = document.getElementsByName('A'),
    AValue = Array.from(Anodes)
       .filter(node => node.checked)
       .map(node => node.value)
       .pop();
console.log(AValue);

Note that I'm using arrow functions. See this fiddle for a working example.

Upvotes: 2

pawan vedak
pawan vedak

Reputation: 167

Use document.querySelector('input[type = radio]:checked').value; to get the value of the selected checkbox. You can use other attributes to get value like name = gender, etc. Please go through the below snippet. Definitely it will helpful to you.

Solution

document.mainForm.onclick = function(){
    var gender = document.querySelector('input[name = gender]:checked').value;
    result.innerHTML = 'You Gender: '+gender;
}
<form id="mainForm" name="mainForm">
    <input type="radio" name="gender" value="Male" checked/>Male
    <input type="radio" name="gender" value="Female" />Female
    <input type="radio" name="gender" value="Others" />Others
</form>
<span id="result"></span>

Upvotes: 15

Surendra K
Surendra K

Reputation: 54

If you are using the jQuery, please use the bellow snippet for group of radio buttons.

var radioBtValue = $('input[type=radio][name=radiobt]:checked').val();

Upvotes: 0

Anshu
Anshu

Reputation: 39

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

The 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>

The JavaScript

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);`

Upvotes: -1

Animesh Singh
Animesh Singh

Reputation: 9282

I used the jQuery.click function to get the desired output:

$('input[name=rate]').click(function(){
  console.log('Hey you clicked this: ' + this.value);

  if(this.value == 'Fixed Rate'){
    rate_value = $('#r1').value;
  } else if(this.value =='Variable Rate'){
    rate_value = $('#r2').value;
  } else if(this.value =='Multi Rate'){
    rate_value = $('#r3').value;
  }

  $('#results').innerHTML = rate_value;
});

Upvotes: 0

Nabeel Iqbal
Nabeel Iqbal

Reputation: 73

Check a value by ID:

var CheckedValues = ($("#r1").is(':checked')) ? 1 : 0;

Upvotes: 0

user7420100
user7420100

Reputation: 11

<form id="rates">
  <input type="radio" name="rate" value="Fixed Rate"> Fixed
  <input type="radio" name="rate" value="Variable Rate"> Variable
  <input type="radio" name="rate" value="Multi Rate" checked> Multi
</form>

then...

var rate_value = rates.rate.value;

Upvotes: 0

tony gil
tony gil

Reputation: 9554

Directly calling a radio button many times gives you the value of the first button, not the checked button. Instead of looping through radio buttons to see which one is checked, I prefer to call an onclick JavaScript function that sets a variable that can later be retrieved at will.

<input type="radio" onclick="handleClick(this)" name="reportContent" id="reportContent" value="/reportFleet.php" >

Which calls:

var currentValue = 0;
function handleClick(myRadio) {
    currentValue = myRadio.value;
    document.getElementById("buttonSubmit").disabled = false;
}

An additional advantage being that I can treat data and/or react to the checking of a button (in this case, enabling the submit button).

Upvotes: 4

David Contreras
David Contreras

Reputation: 236

Here is a solution putting the radio buttons in a constant and getting the selected value only when needed.

const rates = document.forms.rates.elements["rate"]
showRate()
function showRate(){
    document.getElementById('results').innerHTML = rates.value
}
<form id="rates" onchange="showRate()">
  <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 
</form>
<div id="results"></div>

Upvotes: 2

Joe F
Joe F

Reputation: 4252

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;
}

Or

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

Upvotes: 326

Kamil Kiełczewski
Kamil Kiełczewski

Reputation: 92347

Shortest

[...rates.children].find(c=>c.checked).value


let v= [...rates.children].find(c=>c.checked).value

console.log(v);
<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>

Upvotes: 9

Adrian Andersen
Adrian Andersen

Reputation: 83

You can also loop through the buttons with a forEach-loop on the elements

    var elements = document.getElementsByName('radioButton');
    var checkedButton;
    console.log(elements);
    elements.forEach(e => {
        if (e.checked) {
            //if radio button is checked, set sort style
            checkedButton = e.value;
        }
    });

Upvotes: 3

Yukul&#233;l&#233;
Yukul&#233;l&#233;

Reputation: 17052

You can use .find() to select checked element:

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

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

Upvotes: 2

mahdavipanah
mahdavipanah

Reputation: 600

Simply use: document.querySelector('input[rate][checked]').value

Upvotes: 0

James Cluade
James Cluade

Reputation: 11

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

cannot get values of a radio button like that instead use

rate_value = document.getElementById('r1').value;

Upvotes: 0

Kun Wang
Kun Wang

Reputation: 1

If the buttons are in a form
var myform = new FormData(getformbywhatever); myform.get("rate");
QuerySelector above is a better solution. However, this method is easy to understand, especially if you don't have a clue about CSS. Plus, input fields are quite likely to be in a form anyway.
Didn't check, there are other similar solutions, sorry for the repetition

Upvotes: 0

Malathy
Malathy

Reputation: 357

The one worked for me is given below from api.jquery.com.

HTML

<input type="radio" name="option" value="o1">option1</input>
<input type="radio" name="option" value="o2">option2</input>

JavaScript

var selectedOption = $("input:radio[name=option]:checked").val()

The variable selectedOption will contain the value of the selected radio button (i.e) o1 or o2

Upvotes: 17

Parthik Gosar
Parthik Gosar

Reputation: 11646

This works in IE9 and above and all other browsers.

document.querySelector('input[name="rate"]:checked').value;

Upvotes: 792

Frank Conijn - Support Ukraine
Frank Conijn - Support Ukraine

Reputation: 3190

A year or so has passed since the question was asked, but I thought a substantial improvement of the answers was possible. I find this the easiest and most versatile script, because it checks whether a button has been checked, and if so, what its value is: 

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Check radio checked and its value</title>
</head>
<body>

    <form name="theFormName">
        <input type="radio" name="theRadioGroupName" value="10">
        <input type="radio" name="theRadioGroupName" value="20">
        <input type="radio" name="theRadioGroupName" value="30">
        <input type="radio" name="theRadioGroupName" value="40">
        <input type="button" value="Check" onclick="getRadioValue('theRadioGroupName')">
    </form>

    <script>
        function getRadioValue(groupName) {
            var radios = theFormName.elements[groupName];
            window.rdValue; // declares the global variable 'rdValue'
            for (var i=0; i<radios.length; i++) {
                var someRadio = radios[i];
                if (someRadio.checked) {
                    rdValue = someRadio.value;
                    break;
                }
                else rdValue = 'noRadioChecked';
            }
            if (rdValue == '10') {
                alert('10'); // or: console.log('10')
            }
            else if (rdValue == 'noRadioChecked') {
                alert('no radio checked');
            }
        }
    </script>
</body>
</html>

You can also call the function within another function, like this: 

function doSomething() {
    getRadioValue('theRadioGroupName');
    if (rdValue == '10') {
        // do something
    }
    else if (rdValue == 'noRadioChecked') {
        // do something else
    }  
}

Upvotes: 5

Dave
Dave

Reputation: 1961

An improvement to the previous suggested functions:

function getRadioValue(groupName) {
    var _result;
    try {
        var o_radio_group = document.getElementsByName(groupName);
        for (var a = 0; a < o_radio_group.length; a++) {
            if (o_radio_group[a].checked) {
                _result = o_radio_group[a].value;
                break;
            }
        }
    } catch (e) { }
    return _result;
}

Upvotes: 3

pradeep
pradeep

Reputation: 61

In Javascript we can get the values by using Id's "getElementById()" in the above code you posted has contain name not Id so you to modify like this

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

use this rate_value according to your code

Upvotes: 6

Joe
Joe

Reputation: 6416

You can get the value by using the checked property.

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;
    }
}

Upvotes: 162

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