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Targeting the nth element of certain class when nth checkbox is checked?

So I have a dynamically listed set of elements, each structured as follows:
<div class="under-item-description">
<span class="under-compare-price">100</span><span class="under-price">50</span>
<span class="under-compare-price-2">200</span><span class="under-price-2">100</span>
<div class="under-quantity">
<label class="under-quantity-button">
<input type="radio" checked="checked" name="quantity-1" class="under-quantity-radio" value="1"/>
</label>
<label class="under-quantity-button">
<input type="radio" name="quantity-2" class="under-quantity-radio" value="2"/>
</label>
</div>
</div>
The amount of times the .under-item-description div is shown on the page can change. Currently, it shows four times.
What I am trying to do is when a user clicks on the first checkbox (name="quantity-1") in any given .under-item-description div, that div's .under-compare-price and .under-price shows, while .under-compare-price-2 and .under-price-2 are hidden.
If the second checkbox (name="quantity-2") is clicked, then .under-compare-price-2 and .under-price-2 are shown while .under-compare-price and .under-price are hidden, only in that .under-item-description div.
Here's my JS:
$('.under-quantity-button').click(function(){
$('.under-quantity-radio').each(function(){
if($(this).is(':checked')){
$('.under-compare-price:eq('+$(this).parents('.under-item-description').index()+'), .under-price:eq('+$(this).parents('.under-item-description').index()+')').show();
$('.under-compare-price-2:eq('+$(this).parents('.under-item-description').index()+'), .under-price-2:eq('+$(this).parents('.under-item-description').index()+')').show();
}
});
});
However, it doesn't seem to function as I want. Regardless of which second checkbox is clicked, I have the prices appear on the 1st and 3rd elements. And it doesn't switch back when the first checkbox is clicked anywhere. Any help?

Surround each selection of radio buttons in a
<fieldset></fieldset>
This will allow them to work independently, then use jQuery closest() to select the elements to hide.
https://api.jquery.com/closest/

How to select a input with name and value

I need to select a radio input with name and value in jquery
In this example how you select element with name SiblingSex and value female
<form action="">
<input type="radio" name="SiblingSex" value="male">Male<br>
<input type="radio" name="SiblingSex" value="female">Female
<input type="radio" name="ParentSex" value="male">Male<br>
<input type="radio" name="ParentSex" value="female">Female
</form>
i need some thing like
$('input[name="SiblingSex"]' /*GENDER SELECTOR */)

You can add another attribute selector with this:
$('input[name="SiblingSex"][value="female"]').val();
the above line would give you values every time whether it is checked or not.
so if you only want to have the value when it is checked too then add :checked
$('input[name="SiblingSex"][value="female"]:checked').val();

Just have a look on the Demo on my JS Fiddle Code
Shows the two scenario:
1) when you want the value without selecting radio button.
2) when you want value after selecting radio button.
or may be the thing that you want is here::
JS Fiddle Demo

How to add the the attribute "required" based on radio selection in Javascript/Jquery

I am trying to create a form which changes it's required fields dynamically based on a part radio selection.
So a person chooses which way they want to be contacted in the radio:
<label><input type="radio" name="contactPref" id="SMS" value="SMS"/>SMS</label>
<label><input type="radio" name="contactPref" id="Twitter" value="Twitter" />Twitter</label>
<label for="phone">Phone Number:</label>
<input type="tel" name="phone" id="phone"/>
<label for="twitterName">Twitter:</label>
<input type="text" name="twitterName" id="twitterName"/>
And depending on what they decide is their preferred mode of contact. After a field becomes selected, the corresponding text box should be made a required field. For example: if SMS radio field becomes selected then the Phone Number text box must be filled while the other fields becomes optional to fill. If a person chooses the Twitter radio, then the Twitter Name text box becomes a required field.
Here is my jsfiddle jsfiddle.net/lordro/q7Cxs
My key issue is calling up the element and attribute as well as the syntax for it.
Thanks in advance!

$('[name="contactPref"]').on('change', function() {
var isSMS = this.value=='SMS';
$('#phone').prop('required', isSMS);
$('#twitterName').prop('required', !isSMS);
});
FIDDLE

Using jQuery,
$("#SMS").change(function () {
if ($(this).is(':checked')) {
$("#phone").attr("required", "required");
$("#twitterName").removeAttr("required");
}
});
$("#Twitter").change(function () {
if ($(this).is(':checked')) {
$("#twitterName").attr("required", "required");
$("#phone").removeAttr("required");
}
});
Check this fiddle
just note that
*
"The required attribute of the tag is not supported in
Internet Explorer 9 and earlier versions, or in Safari."
*

How to detect if a one radio button in a group has been selected with jQuery

I'm 95% there in writing an HTML5 'required' attribute fallback, I'm having a small issue and I've come to the end of the road in my knowledge!
What works:
Detecting 'required' attributes, looping through and alerting the user in several ways (onsubmit and entering data into the field).
Problem:
I'm taking the form one step further and want to make checkboxes and radio buttons required as well. By doing this, I need to add a required attribute to each radio/checkbox. I need to find out how to differentiate the group of buttons, as currently you need to tick/untick both sets of buttons for the form to validate and let you submit. So in a nutshell, I have three required radios for example, each will need to be ticked, how can I detect whilst looping through the inputs that one of the required radios/checked is ticked - I assume this would be done by matching the 'name' attribute, and if none in the name group are selected then alert just one error.
Here's the state of my loop, you can see I detect the input type as well, just unsure of the next steps forward. a jsFiddle is also below if anyone would be kind enough to help out. Many thanks.
// loop through class name required
$('.required').each(function () {
// this
var self = $(this)
// check shorthand if statement for input[type] detection
var checked = (self.is(':checkbox') || self.is(':radio')) ? self.is(':not(:checked)') : false
// run the empty/not:checked test
if (self.val() === '' || checked) {
// show error if the values are empty still (or re-emptied)
// this will fire after it's already been checked once
self.siblings('.form-error').show()
// stop form submitting
e.preventDefault()
// if it's passed the check
} else {
// hide the error
self.siblings('.form-error').hide()
}
})
Here's my jsFiddle: http://jsfiddle.net/zykF9/

With class selectors you could archive it
http://jsbin.com/owokuw/1/edit
UPDATE
to make easier to understand, here a update:
<input type="radio" name="myradio" class="myradio" />
<input type="radio" name="myradio" class="myradio" />
<input type="radio" name="myradio" class="myradio" />
<input type="radio" name="myradio" class="myradio" />
<input type="hidden" id="selectedRadioYes" />
<input type="button" id="botton" value="Botton" />
Jquery
$(".myradio").click(function(){
$("#selectedRadioYes").val(1);
});
$("#botton").click(function(){
if($("#selectedRadioYes").val() === "1")
alert("you can go on");
else
alert("need select one radio");
});
http://jsbin.com/owokuw/2/edit

Radio Button Control in jquery

I'm new to Web development and jQuery.
I'm trying to build an ASPX page with two RadioButton controls that must perform the following actions:
On page load, one of the two must be selected depending on a flag from an object on the ASPX page. Lets call it customer.Id. If the Id is true, select RadioButton one must be set else select RadioButton 2 must be set.
At any point after page load the user selects a RadioButton, the other must be deselected.
When RadioButton two is clicked, hide a Table named "employee table" and when RadioButton one is clicked, show that Table.
Can anyone please tell me how I can get this functionality in jQuery functions?

Not sure about .NET but in Classic ASP you would write a variable like this <%=customerID%>.
In jQuery, I think you can do something like this:
<input type="radio" id="radio1"> Yes
<input type="radio" id="radio2"> No
<table border="1" id="employeeTable">
<tr><td>This is the table</td></tr>
</table>
... and then some jQuery:
$(document).ready(function() {
var customerID = <%=customerID%> // asp variable
if (customerID != "") {
$('#radio1').prop('checked', 'checked');
} else {
$('#radio2').prop('checked', 'checked');
}
$('#radio1').click(function() {
$('#employeeTable').fadeIn('fast');
})
$('#radio2').click(function() {
$('#employeeTable').fadeOut('fast');
})
})
You can have a look/play here: http://jsfiddle.net/qcLtX/7/
Try changing the customerID value to nothing, like var customerID = "".
Good luck
UPDATE
Where I have used .prop: If you are using jQuery version 1.6 or greater, you should use .prop, otherwise, use .attr.

Radio buttons are grouped by their name attribute, like so (source).
<form>
<input type="radio" name="sex" value="male" /> Male<br />
<input type="radio" name="sex" value="female" /> Female
</form>
If the radio buttons are grouped, then selecting any one of them automatically delselects all the others in that group.
So the buttons cannot have a distinct name. If you want to distinguish between radio buttons (without referring the their value), you should add an id.
<input type="radio" name="sex" id="m" value="male" />
You can set the selected radio button on page load declaratively in markup, or using jquery.
Declarative version:
<input type="radio" checked="checked" name="sex" value="male" />
jQuery:
$(document).ready(function(){
$("#m").attr("checked", "checked");
});