JQuery: How to get selected radio button value?

Question

How do I default the value of a non-selected radio button to 0?

I have the following HTML:

<input type="radio" name="myradiobutton" value="1" />1 <input type="radio" name="myradiobutton" value="2" />2 <input type="radio" name="myradiobutton" value="3" />3 

And I have the following code to get the value of the selected radio button

var radio_button_value $('input[name=myradiobutton]:radio').click(function() {var value = $(this).val();}); 

Problem is, I want to default the value of radio_button_value to 0 in the event nothing is selected. How do I do that?

I basically want to do the pseduo-code below (but this doesn't work)

var radio_button_value $('input[name=myradiobutton]:radio').click(function() {  if set   return $(this).val(); else   return 0; }); 

UPDATE

There appears to be confusion on what I'm asking for.

What I want to do when the page loads (before a user has had a chance to even select a radio button), I want a function that will return 0 for the radio button value.

Then, once a user selected a radio button, that SAME function will return the selected value of the radio button.

Make sense?

Answer 1

$('input[name=myradiobutton]:radio:checked') will get you the selected radio button $('input[name=myradiobutton]:radio:not(:checked)') will get you the unselected radio buttons

Using this you can do this

$('input[name=myradiobutton]:radio:not(:checked)').val("0"); 

Update: After reading your Update I think I understand You will want to do something like this

var myRadioValue;  function radioValue(jqRadioButton){   if (jqRadioButton.length) {     myRadioValue = jqRadioButton.val();   }   else {     myRadioValue = 0;   } }  $(document).ready(function () {   $('input[name=myradiobutton]:radio').click(function () {   //Hook the click event for selected elements     radioValue($('input[name=myradiobutton]:radio:checked'));   });    radioValue($('input[name=myradiobutton]:radio:checked')); //check for value on page load }); 

Answer 2

Use the :checked selector to determine if a value is selected:

function getRadioValue () {     if( $('input[name=myradiobutton]:radio:checked').length > 0 ) {         return $('input[name=myradiobutton]:radio:checked').val();     }     else {         return 0;     } } 

Update you can call the function above at any time to get the selected value of the radio buttons. You can hook into it on load and then whenever the value changes with the following events:

$(document).ready( function() {     // Value when you load the page for the first time     // Will return 0 the first time it's called     var radio_button_value = getRadioValue();      $('input[name=myradiobutton]:radio').click( function() {         // Will get the newly selected value         radio_button_value = getRadioValue();     }); }