JavaScript code for check the value of radio button (jQuery.val(); alternative)

I've two radio buttons to select a type of IVA:

<input type="radio" value="18" checked="true" name="ivacontract"> 18%
<input type="radio" value="16" name="ivacontract"> 16%

And I've one function that will calculate a value depending of the value of the radio button with name "ivacontract". In jQuery I'll use a selector and .val(); to get the value but thi开发者_如何学Cs application (not coded by me) doesn't use jQuery so I don't know how to do it.

Any help?

Thank you in advance!

function getCheckedValues(objName)
    {   
        var arr = new Array();
        arr = document.getElementsByName(objName);

        for(var i = 0; i < arr.length; i++)
        {
            var obj = document.getElementsByName(objName).item(i);

            if(obj.checked)
            {
                alert(obj.value);
            }
        }
    }

getCheckedValues("ivacontract");

Here is a working sample:

http://jsfiddle.net/eJBg9/1/

Try this:

function checkradio(fname,rname)
{
    var radios=document[fname].elements[rname];
    for(var i=0;i<radios.length;i++)
    {
    if(radios[i].checked)
        return radios[i].value;
    }
    return false;
}

Where fname is your form name and rname is your radio buttons name that is in your code is ivacontract.

Hope this helps.

Also, here is an example of getting and setting a value for the radio buttons.

http://www.somacon.com/p143.php

<input type="radio" id="radio1" value="18" checked="true" name="ivacontract"> 18%
<input type="radio" id="radio2" value="16" name="ivacontract"> 16%


if (document.getElementById('radio1').checked==true) )
{
///   Your Code ///
}