Radio button uncheck on second click

Question

I have a LOT of radio buttons that grab a value from my database and if it is set to "1", I make the radio button checked.

If a radio button is checked, and a user clicks on it again, I still want to be able to clear this button. Does anyone have an idea?

$radio1 grabs data from database and will be either 0, 1, or 2

<input value="1" name="radio1" type="radio"<?php if($radio1==1){echo " checked";} ?>>
<input value="2" name="radio2" type="radio"<?php if($radio1==2){echo " checked";} ?>>

Varun Malhotra's Answer slightly modified: I changed 2 lines of code that worked a little better for me. But overall, Varun's answer was PERFECT!

$('input[type="radio"]').click(function(){
    var $radio = $(this);

    // if this was previously checked
    if ($radio.data('waschecked') == true)
    {
        $radio.prop('checked', false);
        $radio.data('waschecked', false);
    }
    else
    {
         $radio.prop('checked', true);
         $radio.data('waschecked', true);
    }

    // remove was checked from other radios
    $radio.siblings('input[type="radio"]').data('waschecked', false);
});

Answer 1

I'll suggest to add a custom attribute to keep track of each radio's previous state like so:

$(function(){
    $('input[name="rad"]').click(function(){
        var $radio = $(this);

        // if this was previously checked
        if ($radio.data('waschecked') == true)
        {
            $radio.prop('checked', false);
            $radio.data('waschecked', false);
        }
        else
            $radio.data('waschecked', true);

        // remove was checked from other radios
        $radio.siblings('input[name="rad"]').data('waschecked', false);
    });
});

You will also need to add this attribute to the initially checked radio markup

<input type="radio" name="rad" id="Radio0" checked="checked" data-waschecked="true" />

JSFIDDLE DEMO

UPDATE:

 $(function(){
        $('input[name="rad"]').click(function(){
            var $radio = $(this);

            // if this was previously checked
            if ($radio.data('waschecked') == true)
            {
                $radio.prop('checked', false);
                $radio.data('waschecked', false);
            }
            else
                $radio.data('waschecked', true);

            // remove was checked from other radios
            $radio.siblings('input[type="radio"]').data('waschecked', false);
        });
    });

But do ensure that you don't have other radio-groups to work with, otherwise you have to provide some attributes to specify these buttons like name prop I focused earlier.

Answer 2

This should work more generally than the other solutions as it handles cases where all radios are not in the same parent.

var $radios = $('input[type="radio"]');
$radios.click(function () {
  var $this = $(this);
  if ($this.data('checked')) {
    this.checked = false;
  }
  var $otherRadios = $radios.not($this).filter('[name="'
                                               + $this.attr('name') + '"]');
  $otherRadios.prop('checked', false).data('checked', false);
  $this.data('checked', this.checked);
});

Answer 3

Change event fires before click when you do first click. You can use them. Working with many radio groups and even if you have prechecked radio buttons.

$("input[type=radio]").each(function() {
    var secondClick = true;
    $(this).change(function() {
        secondClick = false;
    });
    $(this).click(function() {
        if (secondClick) {
            $(this).prop("checked", false);
        }
        secondClick = true;
    });
});

JSFIDDLE DEMO