How to reset radiobuttons in jQuery so that none is checked

Question

I have radio buttons in HTML like this:

    1
    

        

Answer 1

Finally after a lot of tests, I think the most convenient and efficient way to preset is:

var presetValue = "black";
$("input[name=correctAnswer]").filter("[value=" + presetValue + "]").prop("checked",true);
$("input[name=correctAnswer]").button( "refresh" );//JQuery UI only

The refresh is required with the JQueryUI object.

Retrieving the value is easy :

alert($('input[name=correctAnswer]:checked').val())

Tested with JQuery 1.6.1, JQuery UI 1.8.