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Input field inside a radio button not working

I tried to make the input field onclick of a radio button work and it seems like not working.
My fiddle: https://jsfiddle.net/6qoe89j2/8/
$("#ddlMth").hide();
$("input[type='radio']").change(function() {
if ($(this).val() == "delivery-yes") {
$("#ddlMth").show();
} else {
$("#ddlMth").hide();
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="radio" name="radioFrequency" onclick="myMth()" id="radioFrequency-0" value="delivery-yes" /> Yes.
<input type="radio" name="radioFrequency" id="radioFrequency-0" /> No.
<div class="controls">
<label id="ddlMth" name="ddlMth" class="car-list-step-label" for="country">Test</label>
<input id="ddlMth" name="ddlMth" type="text" placeholder="e.g £50" class="form-control car-list-input">
</div>

You cannot have same Id for multiple elements. I have changed the Id of label and Input.
You don't need jQuery, you can do it with CSS.
See below Snippet :
.controls{
display:none;
}
input[value="delivery-yes"]:checked ~ .controls {
display: block;
}
<input type="radio" name="radioFrequency" id="radioFrequency-0" value="delivery-yes" /> Yes.
<input type="radio" name="radioFrequency" id="radioFrequency-0" /> No.
<div class="controls">
<label id="ddlMthLabel" for="ddlMth" class="ddlMth car-list-step-label">Test</label>
<input id="ddlMthInput" name="ddlMth" type="text" placeholder="e.g £50" class="ddlMth form-control car-list-input">
</div>

You set 2 elements with the same id="ddlMth". id must be unique. Jquery selects only the first one then hide it. If you want to hide the label and the input, you should hide the container of them:
$("#ddlMth").hide();
$("input[type='radio']").change(function() {
if ($(this).val() == "delivery-yes") {
$("#ddlMth").show();
} else {
$("#ddlMth").hide();
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<label><input type="radio" name="radioFrequency" id="radioFrequency-0" value="delivery-yes" /> Yes.</label>
<label><input type="radio" name="radioFrequency" id="radioFrequency-0" /> No.</label>
<div class="controls" id="ddlMth">
<label name="ddlMth" class="car-list-step-label" for="country">Test</label>
<input name="ddlMth" type="text" placeholder="e.g £50" class="form-control car-list-input">
</div>

Access a Particular Div Without Changing Class Name

I have a simple requirement: Based on the response of a user on a particular yes no question, show him another question.
The issue is I am using Bootstrap forms so all my div classes are named form-group, and this is the problem: If I rename the class to say, form-group1, my website shape gets disconfigured...some form items appear out of position.
<script src="http://code.jquery.com/jquery-latest.js" />
<script>
$(document).ready(function () {
$(".form-group1").hide();
$("#r1").click(function () {
$(".form-group1").show();
});
$("#r2").click(function () {
$(".form-group1").hide();
});
});
</script>
<form action="">
<input type="radio" name="gender" id="r1" value="female" onClick="getResults()">Single
<input type="radio" name="gender" id="r2" value="male">Married
<!-- Textarea -->
<div class="form-group1">
<label class="col-md-4 control-label" for="q2">By When is your marriage scheduled?</label>
<div class="col-md-4">
<textarea class="form-control" id="q2" name="Q2" placeholder="e.g. FY18 Q4"></textarea>
</div>
</div>
<br />
<br />
<input type="submit" value="Submit">
</form>
So my question is how can I access the particular div that contains the text-area without changing the class-name?

An element can have as many classes as you like.
So just as an alternative, rather than changing the class name, you can also add another class (separated by a space). That way your bootstrap styles are still applied (since you still have the form-group class), but you can also add your own.
<div class="form-group custom-form-group">
<label class="col-md-4 control-label" for="q2">
By When is your marriage scheduled?
</label>
<div class="col-md-4">
<textarea class="form-control" id="q2" name="Q2" placeholder="e.g. FY18 Q4"></textarea>
</div>
</div>
Then in your script you can target the custom-form group class and it should work as you intended.

You can access the div container by first accessing the ID you know and then traverse:
<input type="radio" name="gender" id="r1" data-div="q2" value="female">Female
<input type="radio" name="gender" id="r2" data-div="q2" value="male">Male
$("[name=gender]").on("click",function() {
$("#"+$(this).data("div")) // textarea with known ID from data attribute
.closest("div.form-group") // the container
.toggle(this.value=="male"); // show or hide
})

You can use DOM relationship to target the desired element, You can traverse up to common ancestor using .closest() then use .find() to get the target element.
$(this).closest("form").find(".form-group").show();
$(document).ready(function() {
$(".form-group").hide();
$("#r1").click(function() {
$(this).closest("form").find(".form-group").show();
});
$("#r2").click(function() {
$(this).closest("form").find(".form-group").hide();
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form action="">
<input type="radio" name="gender" id="r1" value="female">Single
<input type="radio" name="gender" id="r2" value="male">Married
<!-- Textarea -->
<div class="form-group">
<label class="col-md-4 control-label" for="q2">By When is your marriage scheduled?</label>
<div class="col-md-4">
<textarea class="form-control" id="q2" name="Q2" placeholder="e.g. FY18 Q4"></textarea>
</div>
</div>
<br><br><input type="submit" value="Submit">
</form>

You can leave the class name unchanged and add an id to the form like this
<div id="form1" class="form-group">...</div>
And then in jQuery do this
$("#form1").show(); // showing the form
$("#form1").hide(); // hiding the form

HTML FORMS - Passing values to two different forms on the same page

I am having problems trying to pass values to two different forms on the same page. The page is populated with 16 radio buttons (which I’ve turned into boxes for display reasons) and they all hold a value (e.g. 001). Both of the forms jobs are to somehow grab the active/selected radio button value and post it to a PHP file so database changes can be made. Instead of a submit button, I am using an anchor to pass a JavaScript submit function. I have tried having
both forms cover the whole page but still didn't have any luck.
I’ll post some code below to help you understand.
PS. If you need more code to understand, I can post it to pastebin.
<li>
<form id="form_ready" method="post" action="../backend/screen.php">
<input type="hidden" name="screenid" value="" />
<input type="hidden" name="status" value="" />
<input type="hidden" name="pickupid" value="document.activeElement.value;" />
<a onclick="document.getElementById('form_ready').submit();">READY</a>
</form>
</li>
<li>
<form id="form_c" method="post" action="../backend/screen.php">
<input type="hidden" name="status" value="" />
<input type="hidden" name="pickupid" value="document.activeElement.value;" />
<a onclick="document.getElementById('form_c').submit();">COLLECTED</a>
</form>
</li>
</ul>
<div id="content">
<div id="container">
<div id="table">
<div id="tr1">
<div id="td1">
<input type="radio" name="pickup" id="1" value="001" />
<label for="1"> <span>001</span> </label>
</div>
<div id="td2">
<input type="radio" name="pickup" id="2" value="002" />
<label for="2"> <span>002</span> </label>
</div>
<div id="td3">
<input type="radio" name="pickup" id="3" value="003" />
<label for="3"> <span>003</span> </label>
</div>
<div id="td4">
<input type="radio" name="pickup" id="4" value="004" />
<label for="4"> <span>004</span> </label>
</div>

To answer the suggestion in the comments and use only one form, here's how to grab the value from the selected radio button:
var inputs = document.getElementsByTagName('input');
var valueSelected;
for (var i = 0; i < inputs.length; i++) {
if (inputs[i].checked) valueSelected = inputs[i].value;
}
valueSelected will contain the value of the selected radio.
If you ever need to reduce the type to "radio" only for some reason, you can check an input type with inputs[i]['type'] === 'radio' in the for loop.
The best would probably still be to set a class for your "radio" inputs, it will allow the loop to be more specific, hence a more efficient code, for example:
<input type="radio" class="myRadio">
and in JS: var inputs = document.getElementsByClassName('myRadio');

jQuery - Uncheck other checkboxes if a specific checkbox is selected by user

I would like to uncheck all the checkboxes that are presently selected if a specific checkbox is selected by the user.
Example:
<div>
<label for="foo">
<input type="checkbox" name="meh" id="foo" checked> foo
</label>
</div>
<div>
<label for="bar">
<input type="checkbox" name="meh" id="bar" checked> bar
</label>
</div>
<div>
<label for="foobar">
<input type="checkbox" name="meh" id="foobar"> foobar
</label>
</div>
<div>
<label for="barfoo">
<input type="checkbox" name="meh" id="barfoo" checked> barfoo
</label>
</div>
<div>
<label for="omgwtfbbq">
<input type="checkbox" name="meh" id="omgwtfbbq"> omgwtfbbq
</label>
</div>
If the user selects "omgwtfbbq" checkbox, I would like all the other boxes that might be checked to be unchecked and have the "omgwtfbbq" be the only one checked.

for the label instead of id I think you need for
<div>
<label for="foo">
<input type="checkbox" name="foo" id="foo" checked /> foo
</label>
</div>
<div>
<label for="bar">
<input type="checkbox" name="bar" id="bar" checked /> bar
</label>
</div>
<div>
<label for="foobar">
<input type="checkbox" name="foobar" id="foobar" /> foobar
</label>
</div>
<div>
<label for="barfoo">
<input type="checkbox" name="barfoo" id="barfoo" checked /> barfoo
</label>
</div>
<div>
<label for="omgwtfbbq">
<input type="checkbox" name="omgwtfbbq" id="omgwtfbbq" /> omgwtfbbq
</label>
</div>
then
var $others = $('input[type="checkbox"][name="meh"]').not('#omgwtfbbq')
$('#omgwtfbbq').change(function () {
if (this.checked) {
$others.prop('checked', false)
}
});
$others.change(function () {
if (this.checked) {
$('#omgwtfbbq').prop('checked', false)
}
})
Demo: Fiddle
Note: I'll add a common class to all the input elements which has to be affected by omgwtfbbq and change var $others = $('#foo, #bar, #foobar, #barfoo') to var $others = $('.myclassoninput')

Live demo (click).
$('#omgwtfbbq').click(function() {
$('input:checkbox').not(this).attr('checked', false);
});
Also note that you're re-using id's. Id's should only be used once in a document.

If you choose not to give each checkbox a sequential IDs so that you can use an array, here's a solution:
Place all your controls in a div, with an ID "checkgroup".
Then the JavaScript function goes:
function checkone(d){
if (!d.checked) return; //if it's unchecked, then do nothing
var group=document.getElementById('checkgroup');
var os=group.getElementsByTagName('input');
for (var i=0;i<os.length;i++){
if (os[i].checked&&os[i]!=d) os[i].checked=false;
}
}
Now you can call this function in each checkbox
<div id="checkgroup">
<input id="abcd" onclick="checkone(this);">
<input id="xyz" onclick="checkone(this);">
...
</div>
Note how you don't even need to bother with the name, because the object passes in itself.

Combo box for all control

I created a filterable drop Down List using JavaScript. This is the List Box Coding.
<select name="d1" class="leftselect" id="d1" size="5" ondblclick="DropDownTextToBox('d1','t1');" style="display:none;" >
<option>axcsus-COMMON STOCK</option>
<option>aces</option>
<option>bdfs</option>
<option>befs</option>
<option>behs</option>
<option>dfgh</option>
<option>dhes</option>
<option>dwww</option>
<option>pass</option>
<option>pass</option>
</select>
I created 4 Text Field and a arrow character. If i click the arrow character , I'll show the list at the bottom of the control.
<div id="div_name" style="float:left;z-index: 20;">
<input name="t1" type="text" id="t1" onkeyup="value_filtering('d1','t1');" onkeypress="onEnter(event,'d1','t1')" />
<input type="button" class="rightselect" onclick="displayList('d1','t1');" value="▼" />
</div>
<div class="inputbox">
<input name="t2" class="inputbox" type="text" id="t2" onkeyup="value_filtering('d2','t2');" onkeypress="onEnter(event,'d2','t2')" />
<input type="button" class="leftselect" onclick="displayList('d1','t2');" value="▼" />
</div>
<div style="float:left;text-align:center;" >
<input name="t3" type="text" id="t3" onkeyup="value_filtering('d3','t3');" onkeypress="onEnter(event,'d3','t3')" />
<input type="button" class="rightselect" onclick="displayList('d1','t3');" value="▼" />
</div>
<div class="inputbox">
<input name="t4" class="inputbox" type="text" id="t4" onkeyup="value_filtering('d4','t4');" onkeypress="onEnter(event,'d4','t4')" />
<input type="button" class="leftselect" onclick="displayList('d1','t4');" value="▼" />
</div>
In the display List function I'm getting the corresponded textbox position and displayed the List Control under the Text Box. Okie. Now my problem is If i select any option in the text box, I need to display the selected value to the textbox which the listbox shown under. After selecting the value from the list box, How i find in which text box showing the List ? Dynamically how can i find the text box id ?
This is my JS code for displaying the Listbox to the corresponding TextBox.
function displayList(ele,txt)
{
vis=document.getElementById(ele);
obj=document.getElementById(txt);
if (vis.style.display==="none")
vis.style.display="block";
else
vis.style.display="none";
vis.style.position = "absolute";
//alert(getElementPosition(txt).top + ' ' + getElementPosition(txt).left);
vis.style.top = getElementPosition(txt).top+obj.offsetHeight;
vis.style.left = getElementPosition(txt).left;
}
Note : I can call this function at the click event of arrow button. I can easily pass the text Field Id. But in the case ListBox action i can't send the particular ID of the Text Field.

If you have no opposition to using jquery you can using the jquery UI built-in autocomplete which will do pretty much what you're looking for. For more advanced and nicer plugins you can try chosen

Try this.
<script>
var targetInput=null;
function displayList(ele,txt) {
vis=document.getElementById(ele);
obj=document.getElementById(txt);
targetInput = obj;
if (vis.style.display==="none") {
vis.style.display = "block";
} else {
vis.style.display = "none";
vis.style.position = "absolute";
//alert(getElementPosition(txt).top + ' ' + getElementPosition(txt).left);
vis.style.top = getElementPosition(txt).top+obj.offsetHeight;
vis.style.left = getElementPosition(txt).left;
}
}
function selectList(txt) {
if (!targetInput) return;
targetInput.value = txt.value;
txt.style.display = 'none';
}
</script>
<div id="div_name" style="float:left;z-index: 20;">
<input name="t1" type="text" id="t1" onkeyup="value_filtering('d1','t1');" onkeypress="onEnter(event,'d1','t1')" />
<input type="button" class="rightselect" onclick="displayList('d1','t1');" value="▼" />
</div>
<div class="inputbox">
<input name="t2" class="inputbox" type="text" id="t2" onkeyup="value_filtering('d2','t2');" onkeypress="onEnter(event,'d2','t2')" />
<input type="button" class="leftselect" onclick="displayList('d1','t2');" value="▼" />
</div>
<div style="float:left;text-align:center;" >
<input name="t3" type="text" id="t3" onkeyup="value_filtering('d3','t3');" onkeypress="onEnter(event,'d3','t3')" />
<input type="button" class="rightselect" onclick="displayList('d1','t3');" value="▼" />
</div>
<div class="inputbox">
<input name="t4" class="inputbox" type="text" id="t4" onkeyup="value_filtering('d4','t4');" onkeypress="onEnter(event,'d4','t4')" />
<input type="button" class="leftselect" onclick="displayList('d1','t4');" value="▼" />
</div>
<select name="d1" class="leftselect" id="d1" size="5" ondblclick="DropDownTextToBox('d1','t1');" onclick="selectList(this)" style="display:none;">
<option>axcsus-COMMON STOCK</option>
<option>aces</option>
<option>bdfs</option>
<option>befs</option>
<option>behs</option>
<option>dfgh</option>
<option>dhes</option>
<option>dwww</option>
<option>pass</option>
<option>pass</option>
</select>