How to change radio button to 'checked' when another is selected?

问题

I hope you guys can help me with this one.

How can I have a radio button id="A" change it's attribute to 'checked' when radio button id="B" is selected?

Radio buttons A and B are in different groups.

Thanks!

回答1:

<input type="radio" name="group1" id="A">Radio A
<input type="radio" name="group2" id="B">Radio B
<input type="radio" name="group2" id="C">Radio C

$("input[type='radio'][name='group2']").change(function() {
  if ($('#B').is(':checked')) {
    $('#A').prop("checked", true);
  } else {
    $('#A').prop("checked", false);
  }
});

Here is the jsFiddle http://jsfiddle.net/8kdb7d6o/

回答2:

$("#B").change(function(){
    $("#A").prop('checked', true);
});

回答3:

to check if radio input checked or not

if($('#B').is('checked')){
   $("#A").prop('checked', true);
}

来源：https://stackoverflow.com/questions/34186848/how-to-change-radio-button-to-checked-when-another-is-selected