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jquery value from checkbox in loop not posting

I have a checkbox with the same name and id but different value.
I trying to get the value when I click on the checkbox in order to pass it to a ajax request. What ever I try I get the same result it only returns the first value in the list (it is actually in a php loop)
function checkCheckboxState() {
if ($('.displayme').is(':checked')) {
//tried all of these...
//var id = $('.displayme').first().attr( "value" );
//var id = $('.displayme').val();
//var id = $(this).val();
alert(id);
}
var id = $(":checkbox[name='displayme']:checked").val();
}
<input type="checkbox" name="displayme" value="27" id="displayme" class="displayme" onclick="checkCheckboxState()">
<input type="checkbox" name="displayme" value="28" id="displayme" class="displayme" onclick="checkCheckboxState()">
<input type="checkbox" name="displayme" value="29" id="displayme" class="displayme" onclick="checkCheckboxState()">

You shouldn't have the same id used several times on the same page.
You can bind an event on the change of the checkbox and then get the value with this :
$("checkbox.displayme").on("change",function(){
var checker = $(this).is(':checked');
//your ajax code here
});
And if your checkbox are generated on a php loop, you can use the index of the loop to generate different id (but with the code above you don't need any id).

Your first problem is that you have multiple elements with the same id. They need to be unique. In this case you could even remove them as you have the common class names to identify the elements.
To solve your actual problem you need to get a reference to the clicked checkbox within the event handler. As you're already using jQuery, you could do that using the change event handler. Try this:
$(function() {
$('.displayme').change(function() {
if (this.checked)
console.log(this.value);
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" name="displayme" value="27" class="displayme">
<input type="checkbox" name="displayme" value="28" class="displayme">
<input type="checkbox" name="displayme" value="29" class="displayme">
Alternatively you can use map() to build an array of all the selected checkboxes which can then be passed in a single AJAX request:
$(function() {
$('.displayme').change(function() {
var values = $('.displayme:checked').map(function() {
return this.value;
}).get()
console.log(values);
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" name="displayme" value="27" class="displayme">
<input type="checkbox" name="displayme" value="28" class="displayme">
<input type="checkbox" name="displayme" value="29" class="displayme">

Two checkboxes acting as one

I have two checkboxes on a page and I want them to act as only one. For example, I select one, and the other is selected automatically, and vice-versa.
I've managed to select both of them at once, but I can't seem to figure out a way to deselect them at once.
And what's bothering me the most, is that it's probably a super simple line of code that I'm simply not remembering.
Is there a way to do this?

Is this what you're looking for?
$(".test").change(function () {
$(".test").attr("checked", this.checked);
});
<input type='checkbox' class='test'>A<br />
<input type='checkbox' class='test'>B<br />

Here is a solution in pure javascript:
// Select all checkboxes using `.checkbox` class
var checkboxes = document.querySelectorAll('.checkbox');
// Loop through the checkboxes list
checkboxes.forEach(function (checkbox) {
// Then, add `change` event on each checkbox
checkbox.addEventListener('change', function(event) {
// When the change event fire,
// Loop through the checkboxes list and update the value
checkboxes.forEach(function (checkbox) {
checkbox.checked = event.target.checked;
});
});
});
<label><input type="checkbox" class="checkbox"> Item 1</label>
<br>
<label><input type="checkbox" class="checkbox"> Item 2</label>

$(document).ready(function() {
$('#check_one').change(function() {
$('#check_two').prop('checked', $('#check_one').prop('checked'));
});
$('#check_two').change(function() {
$('#check_one').prop('checked', $('#check_two').prop('checked'));
});
});
<form>
<label>Simple checkbox</label>
<input type="checkbox" id="check_one" />
<label>Complicated checkbox</label>
<input type="checkbox" id="check_two" />
</form>
Assuming you have two checkboxes named differently but working in concert, this code would work

html:
<input type="checkbox" id="1" class="handleAsOne">
<input type="checkbox" id="2" class="handleAsOne">
javascript (jquery):
$('.handleAsOne').on('change'){
$('.handleAsOne').prop('checked', false);
$(this).prop('checked', true);
}
if i understood your question correctly you are looking for something like this.

Combine url with multiple same args from submitted form

I have a form with multiple checkboxes, all called filter. When the form gets submitted, they get added to the URL, "example.com/?filter=var", as expected.
When there are multiple checkboxes selected, they get added to the url like so: "example.com/?filter=var&filter=var2".
Is it possible to change this somehow? I need them in the url as "example.com/?filter=var+var2".
Is this possible to achieve somehow? Using Javascript is no problem.

Add a function call to your Submit button and leave your form tag like this <form>.
$(function () {
$('#target').click(function () {
var checkValues = $('input[name=checkboxlist]:checked').map(function() {
return $(this).parent().text();
}).get().join('+');
window.location.href = "http://example.com/?filter="+checkValues;
});
});​

You can use a hidden field for that, and in the submit event you set it's value with the filters. The hidden will get the name as filter and the checkboxes' values will be ignored:
//$("form").on("submit", function() {
$('input[type="submit"]').on("click", function() {
var filter = [];
$('input[type="checkbox"]:checked').each(function() {
filter.push(this.value);
});
$("#filter").val(filter.join("+"));
console.log("filters", filter.join("+"));
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
<input type="hidden" name="filter" id="filter" />
<input type="checkbox" value="val1" />
<input type="checkbox" value="val2" />
<input type="checkbox" value="val3" />
<input type="submit" />
</form>
Use $("form").on("submit", function() { instead of the event in the button. I just commented it because you can't submit in StackOverflow snippet.
Fiddle Version

jquery syntax for .on("change","input[name^=

Project Focus
Toggle Checkbox(es)
Special Requirement
Need to bind the new(dynamically) added div.id container that holds these checkboxes. Note: this div.id has been dynamically generated (client-side).
Status
My Working Fiddle successfully toggles between 1(one) or 0(none) checkboxes.
The HTML
<div id="bind_id">
<input type="checkbox" name="iso_01[]" class="setTitlePre1" value="L/R" />
<label for name "iso_01" class="isoVar1">No.1</label>
<input type="checkbox" name="iso_01[]" class="setTitlePre2" value="Alt" />
<label for name "iso_01" class="isoVar2">No.2</label>
</div>
Working Script
var checkboxes;
checkboxes = $("input[name^=iso_01]").change(function (e) {
checkboxes.not(this).prop("checked", false);
}
});
Desired Result
I'm having trouble with syntax for updating .click() to .on("click","input..." see Bound Fiddle
Updated Script
var checkboxes;
checkboxes = $("#bind_id").on("change", "input[name^=iso_01]", function (e) {
if (this.checked) {
checkboxes.not(this).prop("checked", false);
}
});

Your issue is,
checkboxes = $("#bind_id").on
is not doing what you think it is doing. It is not storing all the matched nodes.
Try this instead:
In the callback, change
checkboxes.not(..)
to
$('input[name^=iso_01]').not(this).prop("checked", false);
Working fiddle
Or if they are loaded dynamically, you can use $('#bind_id').find('input[name^=iso_01]')

This is not what checkboxes are for. You should be using radio buttons:
<input type="radio" name="example" value="1" id="1">
<label for="1">one</label>
<input type="radio" name="example" value="2" id="2">
<label for="2">two</label>

The problem is checkboxes is the #bind_id element, not the checkboxes. You would need to find the children from that element, to get the child checkbox elements.
Working Example:
var wrapper;
wrapper = $("#bind_id").on("change", "input[name^=iso_01]", function (e) {
if (this.checked) {
wrapper.find("input[name^=iso_01]").not(this).prop("checked", false);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="bind_id">
<input type="checkbox" name="iso_01[]" class="setTitlePre1" value="L/R" />
<label for name "iso_01" class="isoVar1">No.1</label>
<input type="checkbox" name="iso_01[]" class="setTitlePre2" value="Alt" />
<label for name "iso_01" class="isoVar2">No.2</label>
</div>

copy label text to input

I have tried several ways to achieve this, but somehow nothing works for this.
How can I copy the "label text" of respective Radio Button, which is selected by user into the input field (Result Box) in real time?
HTML -
<ul class="gfield_radio" id="input_4_4">
Radio Buttons:
<br />
<li class="gchoice_4_0">
<input name="input_4" type="radio" value="2" id="choice_4_0" class="radio_s" tabindex="4">
<label for="choice_4_0">Hi</label>
</li>
<li class="gchoice_4_1">
<input name="input_4" type="radio" value="4" id="choice_4_1" class="radio_s" tabindex="5">
<label for="choice_4_1">Hello</label>
</li>
<li class="gchoice_4_2">
<input name="input_4" type="radio" value="3" id="choice_4_2" class="radio_s" tabindex="6">
<label for="choice_4_2">Aloha</label>
</li>
</ul>
<br />
<div class="ginput_container">
Result Box:
<br />
<input name="input_3" id="input_4_3" type="text" value="" class="medium" tabindex="3">
</div>
My attempts:
$('input').change(function() {
if (this.checked) {
var response = $('label[for="' + this.id + '"]').html();
alert(response);
}
// also this:
// if ($("input[type='radio'].radio_s").is(':checked')) {
// var card_type = $("input[type='radio'].radio_s:checked").val();
// alert('card_type');
// }
});

You need to traverse the DOM from the radio which was clicked to find the nearest label element.
$('.radio_s').change(function() {
$('#input_4_3').val($(this).closest('li').find('label').text());
});
Example fiddle
You could also use $(this).next('label') however, that relies on the position of the label element not changing. My first example means the label can be anywhere within the same li as the radio button and it will work.

Try this:
$('.radio_s').click(function() {
$("#input_4_3").val($("input:checked" ).next().text());
});
Demo: http://jsfiddle.net/WQyEw/3/

This is a slightly tricky question to answer well. The structure of your HTML implies that there may be more than one of these structures on the page. So you may have more than one set of radio buttons with a corresponding checkbox.
I have put some working code into a jsFiddle.
I made one change: all the code you had in your question is now in <div class="container">. You would need as many of these as you had groups of radio buttons and checkboxes.
You can then have jQuery code like this:
$('ul.gfield_radio').on('change', 'input[type="radio"]', function () {
var label = $('label[for="' + this.id + '"]');
$(this).closest('.container').find('input.medium').val(label.text());
});
This code is not tied to the id values in this particular bit of HTML, but would work as many times as necessary throughout the page.

Why to depend on third party library when you can achieve it with plain javascript:
<script>
document.addEventListener('DOMContentLoaded', function () {
var a = document.getElementsByName('input_4');
for (var i = 0; i < a.length; i++) {
document.getElementsByName('input_4')[i].addEventListener('change', function () {
showValue(this);
}, false);
}
}, false);
function showValue(element) {
alert(element.parentNode.getElementsByTagName('label')[0].innerHTML)
}
</script>