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

$("input:radio[name=type]").click(function() {

    alert('You clicked radio!');

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

    if($('input:radio[name=type]:checked').val() == "walk_in"){

    }

});

$('#radio-button-id').click(function() {

  if($('#radio-button-id').is(':checked')) 

  { 

    //input where you put a value

    $('#program').val("radio-button-text");

  }                      

});

$(function() {

    var $radios = $('input:radio[name=gender]');

    if($radios.is(':checked') === false) {

        $radios.filter('[value=Male]').prop('checked', true);

    }

});

​

$('input:radio[name="postage"]').change(function(){

​

        if ($(this).val() == 'Yes') {

            //true

        }

        else {

            //false

        }

    });

$("input[name=mygroup][value=" + value + "]").prop('checked', true);

!$("input:radio[value='7'][name='employee-type']").prop('checked')

$('input:radio[name=sex]:nth(0)').attr('checked',true);

or

$('input:radio[name=sex]')[0].checked = true;

// Assuming you have a radio input element with the class 'myRadio'

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