jQuery radio button methods

HTML

<input type="radio" name="targetaddress" value="own">Own</input>
<input type="radio" name="targetaddress" value="other" visibility: hidden>Other</input>


<input type="text" name="normaltext" value="Sample text"></input>

<div id="verbose">
    
</div>

CSS

input[type=text] {
    display: none;
}

JavaScript

(function ($) {

    function changeRadioButton(element, value) {
        var name = $(element).attr("name");
        $("[type=radio][name=" + name + "]:checked").removeAttr("checked");
        $("[type=radio][name=" + name + "][value=" + value + "]").attr("checked", "checked");
        $("[type=radio][name=" + name + "]:checked").change();
    }
    
    function getRadioButton(element) {
        var name = $(element).attr("name");
        return $("[type=radio][name=" + name + "]:checked").attr("value");
    }
    
    var originalVal = $.fn.val;
    $.fn.val = function(value) {
        
        //is it a radio button? treat it differently.
        if($(this).is("[type=radio]")) {
            
            if (typeof value != 'undefined') {
        
                //setter
                changeRadioButton(this, value);
                return $(this);
        
            } else {
                
                //getter
                return getRadioButton(this);
                
            }
            
        } else {
            
            //it wasn't a radio button - let's call the default val function.
            if (typeof value != 'undefined') {
                return originalVal.call(this, value);
            } else {
                return originalVal.call(this);
            }
            
        }
    };
})(jQuery);

//init
$(function() {
    
    function log(data) {
        $("#verbose").append("<div>" + data + "</div>");
    }
    
    function assertEqual(val1, val2) {
        if(val1 != val2) {
            alert("assertEqual failed: " + val1 + "/" + val2);
        }
    }
    
    var radioValue = $("input[name=targetaddress]")
        .change(function() {
            log("Value change: " + $(this).val());
        })
        .val("other")
        .val();
    assertEqual(radioValue, "other");
    
    var textValue = $("input[name=normaltext]")
        .val("Oh my god")
        .val();
    assertEqual(textValue, "Oh my god");
});