[jquery] Find out whether radio button is checked with JQuery?

I can set a radio button to checked fine, but what I want to do is setup a sort of 'listener' that activates when a certain radio button is checked.

Take, for example the following code:

$("#element").click(function()
{ 
    $('#radio_button').attr("checked", "checked");
});

it adds a checked attribute and all is well, but how would I go about adding an alert. For example, that pops up when the radio button is checked without the help of the click function?

$('.radio-button-class-name').is('checked') didn't work for me, but the next code worked well:

    if(typeof $('.radio-button-class-name:checked').val() !== 'undefined'){
     // radio button is checked
    }

Another way is to use prop (jQuery >= 1.6):

$("input[type=radio]").click(function () {
    if($(this).prop("checked")) { alert("checked!"); }
});

jQuery is still popular, but if you want to have no dependencies, see below. Short & clear function to find out if radio button is checked on ES-2015:

function getValueFromRadioButton( name ){_x000D_
  return [...document.getElementsByName(name)]_x000D_
         .reduce( (rez, btn) => (btn.checked ? btn.value : rez), null)_x000D_
}_x000D_
_x000D_
console.log( getValueFromRadioButton('payment') );

<div>  _x000D_
  <input type="radio" name="payment" value="offline">_x000D_
  <input type="radio" name="payment" value="online">_x000D_
  <input type="radio" name="payment" value="part" checked>_x000D_
  <input type="radio" name="payment" value="free">_x000D_
</div>

... Thanks guys... all I needed was the 'value' of the checked radio button where each radio button in the set had a different id...

 var user_cat = $("input[name='user_cat']:checked").val();

works for me...

ULTIMATE SOLUTION Detecting if a radio button has been checked using onChang method JQUERY > 3.6

         $('input[type=radio][name=YourRadioName]').change(()=>{
             alert("Hello"); });

Getting the value of the clicked radio button

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

You'd have to bind the click event of the checkbox, as the change event doesn't work in IE.

$('#radio_button').click(function(){
    // if ($(this).is(':checked')) alert('is checked'); 
    alert('check-checky-check was changed');
});

Now when you programmatically change the state, you have to trigger this event also:

$('#radio_button').attr("checked", "checked");
$('#radio_button').click();

//Check through class

if($("input:radio[class='className']").is(":checked")) {
     //write your code         
}

//Check through name

if($("input:radio[name='Name']").is(":checked")) {
         //write your code         
}

//Check through data

if($("input:radio[data-name='value']").is(":checked")) {
         //write your code         
}

try this

    if($('input[name="radiobutton"]:checked').length == 0) {
        alert("Radio buttons are not checked");
    }

This will work in all versions of jquery.

//-- Check if there's no checked radio button
if ($('#radio_button').is(':checked') === false ) {
  //-- if none, Do something here    
}

To activate some function when a certain radio button is checked.

// get it from your form or parent id
    if ($('#your_form').find('[name="radio_name"]').is(':checked') === false ) {
      $('#your_form').find('[name="radio_name"]').filter('[value=' + checked_value + ']').prop('checked', true);
    }

your html

$('document').ready(function() {
var checked_value = 'checked';
  if($("#your_form").find('[name="radio_name"]').is(":checked") === false) {
      $("#your_form")
        .find('[name="radio_name"]')
        .filter("[value=" + checked_value + "]")
        .prop("checked", true);
    }
  }
)

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form action="" id="your_form">
  <input id="user" name="radio_name" type="radio" value="checked">
        <label for="user">user</label>
  <input id="admin" name="radio_name" type="radio" value="not_this_one">
    <label for="admin">Admin</label>
</form>

As Parag's solution threw an error for me, here's my solution (combining David Hedlund's and Parag's):

if (!$("input[name='name']").is(':checked')) {
   alert('Nothing is checked!');
}
else {
   alert('One of the radio buttons is checked!');
}

This worked fine for me!

dynamic generated Radio Button Check radio get value

$("input:radio[name=radiobuttonname:checked").val();

On change dynamic Radio button

$('input[name^="radioname"]').change(function () {if (this.value == 2) { }else{}});

The solution will be simple, As you just need 'listeners' when a certain radio button is checked. Do it :-

if($('#yourRadioButtonId').is(':checked')){ 
// Do your listener's stuff here. 
}

$("#radio_1").prop("checked", true);

For versions of jQuery prior to 1.6, use:

$("#radio_1").attr('checked', 'checked');

Working with all types of Radio Buttons and Browsers

if($('#radio_button_id')[0].checked) {
   alert("radiobutton checked")
}
else{
   alert("not checked");
}

Working Jsfiddle Here

If you have a group of radio buttons sharing the same name attribute and upon submit or some event you want to check if one of these radio buttons was checked, you can do this simply by the following code :

$(document).ready(function(){
  $('#submit_button').click(function() {
    if (!$("input[name='name']:checked").val()) {
       alert('Nothing is checked!');
        return false;
    }
    else {
      alert('One of the radio buttons is checked!');
    }
  });
});

Source

jQuery API Ref

Try this:

alert($('#radiobutton')[0].checked)

If you don't want a click function use Jquery change function

$('#radio_button :checked').live('change',function(){
alert('Something is checked.');
});

This should be the answer that you are looking for. if you are using Jquery version above 1.9.1 try to use on as live function had been deprecated.