HTML Radio Button Customization with jQuery

HTML Radio Button Customization with jQuery - javascript

<input type="radio" name="tshirt" value="1" ><label>T-Shirt-1</label><br>
<input type="radio" name="tshirt" value="2" ><label>T-Shirt-2</label><br>
<input type="radio" name="tshirt" value="3" ><label>T-Shirt-3</label><br>
<input type="radio" name="tshirt" value="4" ><label>No T-Shirt</label><br><br>
<input type="radio" name="shirt" value="1" ><label>Shirt-1</label><br>
<input type="radio" name="shirt" value="2" ><label>Shirt-2</label><br>
<input type="radio" name="shirt" value="3" ><label>No Shirt</label><br><br>
<hr>
<br>
<input type="radio" name="shorts" value="1" ><label>Shorts-1</label><br>
<input type="radio" name="shorts" value="2" ><label>Shorts-2</label><br>
<input type="radio" name="shorts" value="3" ><label>Shorts-3</label><br>
<input type="radio" name="shorts" value="4" ><label>Shorts-4</label><br>
<input type="radio" name="shorts" value="5" ><label>No Shorts</label><br><br>
<input type="radio" name="pants" value="1" ><label>Pants-1</label><br>
<input type="radio" name="pants" value="2" ><label>Pants-2</label><br>
<input type="radio" name="pants" value="3" ><label>No Pants</label><br><br>
So you are to chose T-shirt + Shirt and then Shorts + Pants on this sample store.
I want to make it so the customer has to pick at least a T-Shirt OR a Shirt AND at least a pair of Shorts OR Pants.
At least one item above the horizontal line and at least one item below the horizontal line has to be picked.
I am guessing I have to use jQuery to force this?

You can perform a check when a submission happens. Here I have used a submit button and validate the inputs upon clicking it. Also I have changed the name attributes of the NO options so that those options won't affect the selection.
var tshirtSelected = false;
var shirtSelected = false;
var shortSelected = false;
var pantSelected = false;
$("#myBtn").click(function() {
$("input[name='tshirt']").each(function(i, obj) {
if ($(this).is(':checked')) {
tshirtSelected = true;
}
});
if (!tshirtSelected) {
$("input[name='shirt']").each(function(i, obj) {
if ($(this).is(':checked')) {
shirtSelected = true;
}
});
}
if (!(shirtSelected || tshirtSelected)) {
alert("Please select a tshirt or a shirt!!!!");
}
$("input[name='shorts']").each(function(i, obj) {
if ($(this).is(':checked')) {
shortSelected = true;
}
});
if (!shortSelected) {
$("input[name='pants']").each(function(i, obj) {
if ($(this).is(':checked')) {
pantSelected = true;
}
});
}
if (!(shortSelected || pantSelected)) {
alert("Please select a short or a pant!!!!");
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<input type="radio" name="tshirt" value="1">
<label>T-Shirt-1</label>
<br>
<input type="radio" name="tshirt" value="2">
<label>T-Shirt-2</label>
<br>
<input type="radio" name="tshirt" value="3">
<label>T-Shirt-3</label>
<br>
<input type="radio" name="no-tshirt" value="4">
<label>No T-Shirt</label>
<br>
<br>
<input type="radio" name="shirt" value="1">
<label>Shirt-1</label>
<br>
<input type="radio" name="shirt" value="2">
<label>Shirt-2</label>
<br>
<input type="radio" name="no-shirt" value="3">
<label>No Shirt</label>
<br>
<br>
<hr>
<br>
<input type="radio" name="shorts" value="1">
<label>Shorts-1</label>
<br>
<input type="radio" name="shorts" value="2">
<label>Shorts-2</label>
<br>
<input type="radio" name="shorts" value="3">
<label>Shorts-3</label>
<br>
<input type="radio" name="shorts" value="4">
<label>Shorts-4</label>
<br>
<input type="radio" name="no-shorts" value="5">
<label>No Shorts</label>
<br>
<br>
<input type="radio" name="pants" value="1">
<label>Pants-1</label>
<br>
<input type="radio" name="pants" value="2">
<label>Pants-2</label>
<br>
<input type="radio" name="no-pants" value="3">
<label>No Pants</label>
<br>
<br>
<button id="myBtn">OK</button>

Related

Why is my counter always equal to zero even after the correct radio button is pressed?

In my Javascript code, I increment the counter when the right radio button is checked but when I check in the console, the counter doesn't get updated after the correct radio button is checked. Even after I click the submit button which calls a function clicked() that displays the counter. The counter still remains zero. Is there a reason why it doesn't get updated. Here is my Java Script code:
var counter = 0;
if (document.getElementById('blue').checked) {
counter++;
}
if (document.getElementById('age3').checked) {
counter++;
}
if (document.getElementById('hobby2').checked) {
counter++;
}
if (document.getElementById('game3').checked) {
counter++;
}
if (document.getElementById('language4').checked) {
counter++;
}
function clicked() {
document.getElementById("result").innerHTML = "You got " + counter;
}
<h1>Quiz</h1>
<form>
<p>(1) What is my favourite Color?</p>
<input type="radio" id="blue" name="color" value="blue">
<label for="blue">blue</label><br>
<input type="radio" id="red" name="color" value="red">
<label for="red">red</label><br>
<input type="radio" id="green" name="color" value="green">
<label for="green">green</label><br>
<input type="radio" id="purple" name="color" value="purple">
<label for="purple">purple</label>
<br>
<p>(2) How Old am I?</p>
<input type="radio" id="age1" name="age" value="20">
<label for="age1">20</label><br>
<input type="radio" id="age2" name="age" value="22">
<label for="age2">22</label><br>
<input type="radio" id="age3" name="age" value="21">
<label for="age3">21</label><br>
<input type="radio" id="age4" name="age" value="23">
<label for="age4">23</label>
<br>
<p>(3) Which of the following is not of a hobby of mine?</p>
<input type="radio" id="hobby1" name="hobby" value="swimming">
<label for="hobby1">swimming</label><br>
<input type="radio" id="hobby2" name="hobby" value="soccer">
<label for="hobby2">soccer</label><br>
<input type="radio" id="hobby3" name="hobby" value="chess">
<label for="hobby3">chess</label><br>
<input type="radio" id="hobby4" name="hobby" value="coding">
<label for="hobby4">coding</label>
<br>
<p>(4) Which of the following is a game that I like?</p>
<input type="radio" id="game1" name="game" value="NBA">
<label for="game1">NBA</label><br>
<input type="radio" id="game2" name="game" value="FortNite">
<label for="game2">FortNite</label><br>
<input type="radio" id="game3" name="game" value="God of War">
<label for="game3">God of War</label><br>
<input type="radio" id="game4" name="game" value="Call of Duty">
<label for="game4">Call of Duty</label>
<p>(5) At what is my favourite language</p>
<input type="radio" id="language1" name="language" value="python">
<label for="language1">python</label><br>
<input type="radio" id="language2" name="language" value="Javascript">
<label for="language2">Javascript</label><br>
<input type="radio" id="language3" name="language" value="C++">
<label for="language3">C++</label><br>
<input type="radio" id="language4" name="language" value="Java">
<label for="language4">Java</label><br><br>
</form>
<button onclick="clicked()">Submit</button>
<p id="result"> </p>

Put all those radio button checkings into a function and call that function when you hit submit. This should solve your problem.
var counter = 0;
function updateCounter(){
if (document.getElementById('blue').checked) {
counter++;
}
if (document.getElementById('age3').checked) {
counter++;
}
if (document.getElementById('hobby2').checked) {
counter++;
}
if (document.getElementById('game3').checked) {
counter++;
}
if (document.getElementById('language4').checked) {
counter++;
}
}
function clicked() {
updateCounter()
document.getElementById("result").innerHTML = "You got " + counter;
//reset the counter back to zero after displaying score
counter = 0
}
<h1>Quiz</h1>
<form>
<p>(1) What is my favourite Color?</p>
<input type="radio" id="blue" name="color" value="blue">
<label for="blue">blue</label><br>
<input type="radio" id="red" name="color" value="red">
<label for="red">red</label><br>
<input type="radio" id="green" name="color" value="green">
<label for="green">green</label><br>
<input type="radio" id="purple" name="color" value="purple">
<label for="purple">purple</label>
<br>
<p>(2) How Old am I?</p>
<input type="radio" id="age1" name="age" value="20">
<label for="age1">20</label><br>
<input type="radio" id="age2" name="age" value="22">
<label for="age2">22</label><br>
<input type="radio" id="age3" name="age" value="21">
<label for="age3">21</label><br>
<input type="radio" id="age4" name="age" value="23">
<label for="age4">23</label>
<br>
<p>(3) Which of the following is not of a hobby of mine?</p>
<input type="radio" id="hobby1" name="hobby" value="swimming">
<label for="hobby1">swimming</label><br>
<input type="radio" id="hobby2" name="hobby" value="soccer">
<label for="hobby2">soccer</label><br>
<input type="radio" id="hobby3" name="hobby" value="chess">
<label for="hobby3">chess</label><br>
<input type="radio" id="hobby4" name="hobby" value="coding">
<label for="hobby4">coding</label>
<br>
<p>(4) Which of the following is a game that I like?</p>
<input type="radio" id="game1" name="game" value="NBA">
<label for="game1">NBA</label><br>
<input type="radio" id="game2" name="game" value="FortNite">
<label for="game2">FortNite</label><br>
<input type="radio" id="game3" name="game" value="God of War">
<label for="game3">God of War</label><br>
<input type="radio" id="game4" name="game" value="Call of Duty">
<label for="game4">Call of Duty</label>
<p>(5) At what is my favourite language</p>
<input type="radio" id="language1" name="language" value="python">
<label for="language1">python</label><br>
<input type="radio" id="language2" name="language" value="Javascript">
<label for="language2">Javascript</label><br>
<input type="radio" id="language3" name="language" value="C++">
<label for="language3">C++</label><br>
<input type="radio" id="language4" name="language" value="Java">
<label for="language4">Java</label><br><br>
</form>
<button onclick="clicked()">Submit</button>
<p id="result"> </p>

Every time you are getting the value as 0 as the login you written is not calling on clicking of radio button.
First thing Just defined the all radio button into a method like below.
function SelectValue () {
counter = 0;
if (document.getElementById('blue').checked)
{
counter++;
}
if (document.getElementById('age3').checked)
{
counter++;
}
if (document.getElementById('hobby2').checked)
{
counter++;
}
if (document.getElementById('game3').checked)
{
counter++;
}
if (document.getElementById('language4').checked)
{
counter++;
}
}
Now there is two way you can call.
Either call that method in each and every method like below.
<p>(1) What is my favourite Color?</p>
<input type="radio" id="blue" name="color" value="blue" onclick="clickmethodthod()">
<label for="blue">blue</label><br>
Write a logic of click and attached to all radio button.
let counter = 0;
const radios = document.querySelector('input[type="radio"]');
for(radio in radios) {
radios[radio].onclick = function() {
SelectValue ()
}
}
Let me know if you are getting any issue.

how can we show/hide div tags using value of radio buttons in jquery or javascript?

hi i am very new to jquery and i am working on show and hide div tags using values of radio buttons. here is my HTML.
<div id="OwnVehicle" style="display:none">
<label>
<input type="radio" name="vehicleList" id="two" onclick="fuelList()" value="1" />Two Wheeler
</label>
<label>
<input type="radio" name="vehicleList" id="four" onclick="fuelList()" value="2" />Four Wheeler
</label>
</div>
<div id="TwoWheeler" style="display:none">
<label>
<input type="radio" name="TwoWheeler" value="6" />Electric
</label>
<label>
<input type="radio" name="TwoWheeler" value="7" />Petrol
</label>
</div>
<div id="FourWheeler" style="display:none">
<label>
<input type="radio" name="FourWheeler" value="1" />Electric
</label>
<label>
<input type="radio" name="FourWheeler" value="2" />Petrol
</label>
<label>
<input type="radio" name="FourWheeler" value="3" />Diesel
</label>
<label>
<input type="radio" name="FourWheeler" value="4" />CNG
</label>
<label>
<input type="radio" name="FourWheeler" value="5" />LPG
</label>
</div>
now i need help in writing a jquery code for showing the div tag with id = "two wheeler" when radio button value = 1 and div tag with id = "four wheeler" when radio button value = 2.
thnaks in advance.
sorry for anyone who couldnt understand my question.

try this one
function fuelList(val) {
var val = parseInt(val);
if (val == 1) {
$('#FourWheeler').hide();
$('#TwoWheeler').show();
} else {
$('#TwoWheeler').hide();
$('#FourWheeler').show();
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="OwnVehicle">
<label>
<input type="radio" name="vehicleList" id="two" onclick="fuelList(this.value)" value="1" />Two Wheeler
</label>
<label>
<input type="radio" name="vehicleList" id="four" onclick="fuelList(this.value)" value="2" />Four Wheeler
</label>
</div>
<div id="TwoWheeler" style="display:none">
<label>
<input type="radio" name="TwoWheeler" value="6" />Electric
</label>
<label>
<input type="radio" name="TwoWheeler" value="7" />Petrol
</label>
</div>
<div id="FourWheeler" style="display:none">
<label>
<input type="radio" name="FourWheeler" value="1" />Electric
</label>
<label>
<input type="radio" name="FourWheeler" value="2" />Petrol
</label>
<label>
<input type="radio" name="FourWheeler" value="3" />Diesel
</label>
<label>
<input type="radio" name="FourWheeler" value="4" />CNG
</label>
<label>
<input type="radio" name="FourWheeler" value="5" />LPG
</label>
</div>

Here is what you can do easily with JQuery
$(document).ready(function(){
$("input[name='vehicleList']").click(function(){
var selectedValue = $(this).val();
if(selectedValue === "1"){
$('#TwoWheeler').show();
$('#FourWheeler').hide();
}else{
$('#TwoWheeler').hide();
$('#FourWheeler').show();
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="OwnVehicle">
<label>
<input type="radio" name="vehicleList" id="two" value="1" />Two Wheeler
</label>
<label>
<input type="radio" name="vehicleList" id="four" value="2" />Four Wheeler
</label>
</div>
<div id="TwoWheeler" style="display:none">
<label>
<input type="radio" name="TwoWheeler" value="6" />Electric
</label>
<label>
<input type="radio" name="TwoWheeler" value="7" />Petrol
</label>
</div>
<div id="FourWheeler" style="display:none">
<label>
<input type="radio" name="FourWheeler" value="1" />Electric
</label>
<label>
<input type="radio" name="FourWheeler" value="2" />Petrol
</label>
<label>
<input type="radio" name="FourWheeler" value="3" />Diesel
</label>
<label>
<input type="radio" name="FourWheeler" value="4" />CNG
</label>
<label>
<input type="radio" name="FourWheeler" value="5" />LPG
</label>
</div>

Yiu can try this working code:
function fuelList(_this){
var value=$(_this).attr("value");
$("#TwoWheeler").hide();
$("#FourWheeler").hide();
if(value=="1"){
$("#TwoWheeler").show();
}
else if(value=="2"){
$("#FourWheeler").show();
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="OwnVehicle">
<label>
<input type="radio" name="vehicleList" id="two" onclick="fuelList(this)" value="1" />Two Wheeler
</label>
<label>
<input type="radio" name="vehicleList" id="four" onclick="fuelList(this)" value="2" />Four Wheeler
</label>
</div>
<div id="TwoWheeler" style="display:none">
<label>
<input type="radio" name="TwoWheeler" value="6" />Electric
</label>
<label>
<input type="radio" name="TwoWheeler" value="7" />Petrol
</label>
</div>
<div id="FourWheeler" style="display:none">
<label>
<input type="radio" name="FourWheeler" value="1" />Electric
</label>
<label>
<input type="radio" name="FourWheeler" value="2" />Petrol
</label>
<label>
<input type="radio" name="FourWheeler" value="3" />Diesel
</label>
<label>
<input type="radio" name="FourWheeler" value="4" />CNG
</label>
<label>
<input type="radio" name="FourWheeler" value="5" />LPG
</label>
</div>

Assuming I understood the question correctly, and you want to hide a div when you check a radio button?
Here is an example of how that can be achieved:
HTML:
<input type="radio" name="euResident" id="euResidentYes" value="Yes" checked />
<label for="euResidentYes" class="radio">yes</label>
<input type="radio" name="euResident" id="euResidentNo" value="No" />
<label for="euResidentNo" class="radio">no</label>
<div id='div'>Hello World</div>
Javascript:
function switchVar() {
if($("#euResidentNo").prop("checked"))
$("#div").show();
else
$("#div").hide();
}
$(document).ready(function() {
switchVar();
$("input[name=euResident]").change(switchVar);
});
It is an example using Javascript as this is perfect to use for this.
Demo: http://jsfiddle.net/2Uj9F/169/

Here you go with jsfiddle https://jsfiddle.net/ym10add9/
$("input[type='radio']").change(function() {
$('div').hide();
$( '#' + $(this).attr('value')).show();
});

My first suggestion is to change your onclick="" to onchange="".
<input type="radio" name="vehicleList" id="four" onchange="fuelList(this)" value="2" class="radioButtons" />Four Wheeler
<script>
function fuelList(element)
{
var id = element.value;
if( id == 1)
{
$(".wheels")hide(); //hides all the elements with class = wheels
$("#twoWheelers")show(); //shows the div with id = twoWheelers
}
else if( id == 2 )
{
$(".wheels")hide(); //hides all the elements with class = wheels
$("#fourWheelers")show(); //shows the div with id = fourWheelers
}
}
</script>
and put a class to the div of your "twoWheeler" and "fourWheeler"
I just make it "wheels"
<div id="twoWheelers" class="wheels">
...
</div>
<div id="fourWheelers" class="wheels">
...
</div>

I wrote code as per you describe in your post. May be useful to solve your problem.
$(document).ready(function() {
$('input[type=radio][name=vehicleList]').change(function() {
if (this.value == '1') {
$("#FourWheeler").hide();
$("#TwoWheeler").show();
}
else if (this.value == '2') {
$("#FourWheeler").show();
$("#TwoWheeler").hide();
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="vehicleList">
<label>
<input type="radio" name="vehicleList" id="two" value="1" />Two Wheeler
</label>
<label>
<input type="radio" name="vehicleList" id="four" value="2" />Four Wheeler
</label>
</div>
<h5>Output : </h5>
<div id="TwoWheeler" style="display:none">
<label>
<input type="radio" name="TwoWheeler" value="6" />Electric
</label>
<label>
<input type="radio" name="TwoWheeler" value="7" />Petrol
</label>
</div>
<div id="FourWheeler" style="display:none">
<label>
<input type="radio" name="FourWheeler" value="1" />Electric
</label>
<label>
<input type="radio" name="FourWheeler" value="2" />Petrol
</label>
<label>
<input type="radio" name="FourWheeler" value="3" />Diesel
</label>
<label>
<input type="radio" name="FourWheeler" value="4" />CNG
</label>
<label>
<input type="radio" name="FourWheeler" value="5" />LPG
</label>
</div>

Below is simple JQuery code that will help you to achieve your requirement:
$("input[name='vehicleList']").on('click', function() {
if ($(this).val() == 1) {
$('#TwoWheeler').show();
$('#FourWheeler').hide();
} else {
$('#TwoWheeler').hide();
$('#FourWheeler').show();
}
});
#TwoWheeler,
#FourWheeler {
display: none;
}
#OwnVehicle label,
#TwoWheeler label,
#FourWheeler label {
cursor: pointer;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="OwnVehicle">
<label>
<input type="radio" name="vehicleList" id="two" value="1" />Two Wheeler
</label>
<label>
<input type="radio" name="vehicleList" id="four" value="2" />Four Wheeler
</label>
</div>
<div id="TwoWheeler">
<label>
<input type="radio" name="TwoWheeler" value="6" />Electric
</label>
<label>
<input type="radio" name="TwoWheeler" value="7" />Petrol
</label>
</div>
<div id="FourWheeler">
<label>
<input type="radio" name="FourWheeler" value="1" />Electric
</label>
<label>
<input type="radio" name="FourWheeler" value="2" />Petrol
</label>
<label>
<input type="radio" name="FourWheeler" value="3" />Diesel
</label>
<label>
<input type="radio" name="FourWheeler" value="4" />CNG
</label>
<label>
<input type="radio" name="FourWheeler" value="5" />LPG
</label>
</div>

This is one way to do it:
$( "#r0" ).bind( "click", function() {
$("#OwnVehicle").show();
$("#TwoWheeler").hide();
});
$( "#r1" ).bind( "click", function() {
$("#OwnVehicle").hide();
$("#TwoWheeler").show();
});
Here a working fiddle
https://jsfiddle.net/0aa8w2sj/
It can be improved

How do I grab the selected radiobox value from a particular form?

I have some generated HTML along the lines of this.
<form id="form_56">
<input type="radio" name="option" value="0">
<input type="radio" name="option" value="1">
<input type="radio" name="option" value="2">
<input type="radio" name="option" value="3">
<input type="radio" name="option" value="4">
<input type="radio" name="option" value="5">
<input type="radio" name="option" value="6">
</form>
The form id can be anything, but I want to take a form ID and return the selected value from 0 to 6.
I tried following the questions here, but they didn't seem to translate easily to a specific form.
$('#form_56:radio[name=option]:checked').val();
I'm able to use the selector to grab the proper form, but everything I've attempted to get the selected value has returned undefined.
Thanks for your time.

First, you need to change the colon to a space or " > ".
Second you need to change radio to input.
$('#form_56 input[name=option]:checked').val();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form id="form_56">
<input type="radio" name="option" value="0">
<input type="radio" name="option" value="1">
<input type="radio" name="option" value="2">
<input type="radio" name="option" value="3">
<input type="radio" name="option" value="4">
<input type="radio" name="option" value="5">
<input type="radio" name="option" value="6">
</form>
<a href="javascript:console.log($('#form_56 input[name=option]:checked').val());">
<button>Test</button>
</a>

$("#form_56 input:radio[name='option']").val()
You need an event for listening when it changes
see example
$(function() {
$("#form_56 input:radio[name='option']").click(function() {
var val = $(this).val();
alert(val);
});
});
https://jsfiddle.net/rodrigo/cp8rd7h0/

problem in your code: on change event not assign to radio button so undefined alert popup
here is solution:
$(document).ready(function () {
$('input[type=radio]').on('change', function () {
alert($('input[name=option]:checked', '#form_56').val());
});
});

For any form:
$('form>input[type="radio"]:checked').val()
With id:
$('#form_56>input[type="radio"]:checked').val()
It will return selected value or undefined, if no value selected.
Good luck!
function getSelectedValue()
{
return $('form>input[type="radio"]:checked').val();
}
$(function() {
$('button').on(
'click',
function() {
console.log(getSelectedValue() + ' selected');
}
);
});
form {display: inline}
<script src="https://code.jquery.com/jquery-3.0.0.min.js"></script>
<form id="randomId-839054763">
<input type="radio" name="option" value="0">
<input type="radio" name="option" value="1">
<input type="radio" name="option" value="2">
<input type="radio" name="option" value="3">
<input type="radio" name="option" value="4">
<input type="radio" name="option" value="5">
<input type="radio" name="option" value="6">
</form>
<button>Log value</button>

Clearing a textbox field when a radio button is selected in Javascript

I have a web form which allows users to donate money using the predefined radio buttons with a value assigned to them (all different numbers). I also have a choose your own amount textfield which they can write in a custom amount they wish to donate. I want to clear the custom textfield if a user selects a predefined choice.
So far I have created this:
HTML:
<input type="radio" name="am_payment" value="3" checked="checked"> <strong>64</strong>
<input type="radio" name="am_payment" value="11" checked="checked"> <strong>100</strong>
<input type="radio" name="am_payment" value="32" checked="checked"> <strong>250</strong>
<input type="radio" value="" name="am_payment"><label>Other</label>
<input type="text" name="CP_otheramount" value="" id="theamount" disabled="disabled"/>
JAVASCRIPT:
$('input[name="am_payment"]').on('click', function() {
if ($(this).val() === '') {
$('#theamount').removeProp("disabled");
}
else {
$('#theamount').prop("disabled", "disabled");
$('input[name="CP_otheramount"]').val("");
}
});
But basing it on a value === true for value="" just doesn't seem right.
Is there a way to improve this?
Thanks

To disable/enable an element you need to set the value of the disabled property to true/false, removing the property doesn't work so you need
$('input[name="am_payment"]').on('click', function() {
if ($(this).val() === '') {
$('#theamount').prop('disabled', false);
} else {
$('#theamount').prop("disabled", true).val('');
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="radio" name="am_payment" value="3" checked="checked"> <strong>64</strong>
<input type="radio" name="am_payment" value="11" checked="checked"> <strong>100</strong>
<input type="radio" name="am_payment" value="32" checked="checked"> <strong>250</strong>
<input type="radio" value="" name="am_payment">
<label>Other</label>
<input type="text" name="CP_otheramount" value="" id="theamount" disabled="disabled" />

Use removeAttr instead of removeProp and I have modified your code to accept amounts on textbox based on radio button selected
$('input[name="am_payment"]').on('click', function() {
if ($(this).val() === '') {
$('input[name="CP_otheramount"]').val('');
$('#theamount').removeAttr("disabled");
}
else {
$('#theamount').prop("disabled", "disabled");
$('input[name="CP_otheramount"]').val($(this).val());
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="radio" name="am_payment" value="3" checked="checked"> <strong>64</strong>
<input type="radio" name="am_payment" value="11" checked="checked"> <strong>100</strong>
<input type="radio" name="am_payment" value="32" checked="checked"> <strong>250</strong>
<input type="radio" value="" name="am_payment"><label>Other</label>
<input type="text" name="CP_otheramount" value="" id="theamount" disabled="disabled"/>
Update
From your comments I hope you are expecting below functionality.
$('#theamount').on('focus', function() {
$("input:radio").prop("checked",false);
$("input[value='']").prop("checked",true);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="radio" name="am_payment" value="3" checked="checked"> <strong>64</strong>
<input type="radio" name="am_payment" value="11" checked="checked"> <strong>100</strong>
<input type="radio" name="am_payment" value="32" checked="checked"> <strong>250</strong>
<input type="radio" value="" name="am_payment"><label>Other</label>
<input type="text" name="CP_otheramount" value="" id="theamount" disabled="disabled"/>

Show/Hide div if all radios are checked

I have N groups of radios. I would like to show a div if all groups of radios are checked and if not all are checked, show another div:
http://jsfiddle.net/zoLwdqx6/
HTML
<p>
<input type="radio" name="period" value="1" />1 Year
<input type="radio" name="period" value="2" />2 Years
<input type="radio" name="period" value="3" />3 Years
</p>
<br>
<p>
<input type="radio" name="year" value="1" />2015
<input type="radio" name="year" value="2" />2014
<input type="radio" name="year" value="3" />2013
</p>
<br>
<p>
<input type="radio" name="student" value="1" />Paul
<input type="radio" name="student" value="2" />Mary
<input type="radio" name="student" value="3" />Jane
</p>
<br>
<div class="notchecked">[not all checkboxes are selected yet]</div>
<div class="yeschecked">[submit button]</div>
Javascript
$('.yeschecked').hide();
$('input[type=radio]').click(function () {
$('.yeschecked').show();
});

Here is an example where 3 is not hardcoded:
$(function() {
$(".yeschecked").hide();
// count number of radio buttons grouped by name
var radioGroups = [];
$("input[type=radio]").each(function() {
if ($.inArray(this.name, radioGroups) >= 0) {
return;
}
radioGroups.push(this.name);
});
// radioGroups = ["period", "year", "student"]
$("input[type=radio]").on("change", function() {
var all = $("input[type=radio]:checked").length === radioGroups.length;
// using http://api.jquery.com/toggle/#toggle-display
$(".yeschecked").toggle(all);
$(".notchecked").toggle(all === false);
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<p>
<input type="radio" name="period" value="1">1 Year
<input type="radio" name="period" value="2">2 Years
<input type="radio" name="period" value="3">3 Years
</p>
<p>
<input type="radio" name="year" value="1">2015
<input type="radio" name="year" value="2">2014
<input type="radio" name="year" value="3">2013
</p>
<p>
<input type="radio" name="student" value="1">Paul
<input type="radio" name="student" value="2">Mary
<input type="radio" name="student" value="3">Jane
</p>
<div class="notchecked">[not all checkboxes are selected yet]</div>
<div class="yeschecked">[submit button]</div>

You can get the checked radio button count if it is three then all categrories are selected
Live Demo
$('.yeschecked').hide();
$('input[type=radio]').change(function () {
if ($('input[type=radio]:checked').length == 3) {
$('.yeschecked').show();
$('.notchecked').hide();
} else {
$('.notchecked').show();
$('.yeschecked').hide();
}
});

This can be done by length
$(document).ready(function(){
var total = totalChecked = 0;
$('input[type=radio]').on("change",function(){
totalChecked = $('input[type=radio]:checked').length;
if( totalChecked == 3 ){
$('.yeschecked').show();
$('. notchecked').hide();
} else {
$('. notchecked').show();
$('.yeschecked').hide();
}
})
});
for length refer Here
Here is a fiddle to the example

As a group only one radio will be selected, so here only 3 radios will be checked.
var totl; // track total radio groups
$(function() {
var rdos = $('input[type=radio]');
rdos.on('change', toggleDivs);
var tmp = [], nm;
rdos.each(function() {
nm = this.name.toLowerCase();
if (-1 === $.inArray(nm, tmp)) //not found in array
tmp.push(nm); // new group
});
totl = tmp.length; // get count of radio groups
toggleDivs(); //page load trigger
});
var toggleDivs = function() {
var chkd = $('input[type=radio]:checked').length;
$('div.notchecked').toggle(chkd !== totl);
$('div.yeschecked').toggle(chkd === totl);
};
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<p>
<input type="radio" name="period" value="1" />1 Year
<input type="radio" name="period" value="2" />2 Years
<input type="radio" name="period" value="3" />3 Years
</p>
<p>
<input type="radio" name="year" value="1" />2015
<input type="radio" name="year" value="2" />2014
<input type="radio" name="year" value="3" />2013
</p>
<p>
<input type="radio" name="student" value="1" />Paul
<input type="radio" name="student" value="2" />Mary
<input type="radio" name="Student" value="3" />Jane
</p>
<div class="notchecked">[not all checkboxes are selected yet]</div>
<div class="yeschecked">[submit button]</div>

Develop Reference

JavaScript is the programming language of the Web.

HTML Radio Button Customization with jQuery - javascript

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