Get radio button previous state Click event/Uncheck the radio if previously checked

Question

How can I see if a Radio button was already checked in a click event?

Actually what I want to do is that, if the clicked radio was previously checked, and user clicks the same radio again, then un-check it.

But the code below always evaluates the if condition t true :P

$('input.radiooption').click(function(g) {
    if ($(this).is(":checked")) {
        console.log("already checked, now uncheck it");
    } else {
        console.log("Not checked");
    }
});

P.S.

The thing is, When I click an unchecked Radio button, it gets CHECKED

When I click an already checked button, it gets CHECKED

So, I want to know a way to determine the previous state of a radio button inside click event.

JS FIDDLE

Answer 1

Keep a track of the previous state with temp variable:

var prv;
var markIt = function(e) {
  if (prv === this && this.checked) {
    this.checked = false;
    prv = null; //allow seemless selection for the same radio
  } else {
    prv = this;
  }
};
$(function() {
  $('input.radiooption').on('click', markIt);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<input type='radio' name='group' class='radiooption' />
<input type='radio' name='group' class='radiooption' />
<input type='radio' name='group' class='radiooption' />
<input type='radio' name='group' class='radiooption' />
<input type='radio' name='group' class='radiooption' />