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Enable button if radio button selected

I've tried almost all the methods mentioned here and in other websites but still I'm stuck so that's why I'm asking it here.
I've created a form (with out <form></form> tags) in this form I'm creating 4 radios buttons using a while loop data is being pulled from a database.
To send data I'm using a JavaScript(Ajax) which is bound to a button click event.
Now I want to keep the submit button disabled until all the filed's are filled the last filed's are the radio buttons I'm tried to use many other ways to do this but nothing happened so any way below is code I'm using.
function checkUrole() {
var roles = document.getElementById("userRoles"),
btn = document.getElementById("submit"),
len = roles.length,
sel = null;
for(var i=0; i < len; i++){
if (roles.checked){
sel = roles[i].value;
}
}
if (sel === null){
document.getElementById("msgID").innerHTML = "9";
btn.disabled = true;
}else{
btn.disabled = false;
}
}
And this is my HTML
<label for="userRoles">User Role:</label><br>
<?php while ($row = $getUserRoleQuery -> fetch(PDO::FETCH_ASSOC)) { ?>
<input type="radio" id="userRoles" name="userRoles" value="<?php echo $row["urId"]; ?>" onmousedown="checkUrole()"><?php echo $row["userRole"]; }?>
<label id="msgID" hidden></label>
<div id="msg"></div>
Basically the HTML will create something like this,
<input type="radio" id="userRoles" name="userRoles" value="1" onmousedown="checkUrole()">Admin
<input type="radio" id="userRoles" name="userRoles" value="2" onmousedown="checkUrole()">Manager
<input type="radio" id="userRoles" name="userRoles" value="3" onmousedown="checkUrole()">Team Leader
<input type="radio" id="userRoles" name="userRoles" value="4" onmousedown="checkUrole()">User
I don't like write a code like this,
if(document.getElementById("userRoles1").checked{
something here;
}else if(document.getElementById("userRoles2").checked{
something here;
}else{
something here;
}
above I think makes the program a bit less dynamic 'cos if a new user role is added I've add a new IF to the loop.
So is there any way I solve this and I like to use JavaScript if can.
UPDATE: Thanks to #zer00ne I solved this problem and below is the finale working code hope this helps any one in the future as well.
My HTML:
<script language="JavaScript" type="text/javascript" src="../jScripts/userCreatFunctions.js">
<div id="userRoles">
<input type="radio" name="userRoles" value="1" checked>Admin
<input type="radio" name="userRoles" value="2">Manager
<input type="radio" name="userRoles" value="3">Team Leader
<input type="radio" name="userRoles" value="4">User
</div>
My JaveScript:
$(document).ready(function () {
/*Register the change element to #roles
|| When clicked...*/
//This code base was originally developed by zer00ne I'm using it under his permission
//Thanks man.
var form = document.getElementById('userRoles');
if (form){
form.addEventListener('change', function(e) {
/* Determine if the e.target (radio that's clicked)
|| is NOT e.currentTarget (#roles)
*/
if (e.target !== e.currentTarget) {
// Assign variable to e.target
var target = e.target;
// Reference the submit button
var btn = document.querySelector('[name=submit]');
// Enable submit button
btn.disabled = false;
// call rolrDist() passing the target,value
roleDist(target.value);
}
}, false);
}
function roleDist(rank) {
var display = document.getElementById("msg");
if (rank !== null) {
display.innerHTML = "All done! You can save";
} else {
display.innerHTML = "Please Select User Type";
}
}
});
Use the $(document).ready(function () {}) other wise the script get loaded before the DOM which leads to a NULL value making the script none functional.

Firstly, you don't need the id's on every input element. You can get an array of the button element by name using getElementsByName, here is an example of how you would do "something" based on one of those being checked:
JS (Using ES6)
const getRadioValue = (name) => {
const radios = document.getElementsByName(name);
let val;
Object.keys(radios).forEach((obj, i) => {
if (radios[i].checked) {
val = radios[i].value;
}
});
return val;
}
document.getElementById('form').addEventListener('change', (e) => {
getRadioValue('userRoles'); // value of checked radio button.
});
HTML
<div id="form">
<input type="radio" name="userRoles" value="1">Admin
<input type="radio" name="userRoles" value="2">Manager
<input type="radio" name="userRoles" value="3">Team Leader
<input type="radio" name="userRoles" value="4">User
</div>
JsFiddle Example
UPDATE - improved
A more efficient method would be using the Array.prototype.find() method, this is better because:
The find method executes the callback function once for each index of the array until it finds one where callback returns a true value. If such an element is found, find immediately returns the value of that element.
In other words, it doesn't need to iterate the entire Array, once we find what we want it returns.
Note: Use the below snippets within the change event mentioned above to retrieve the checked value.
JS (Using ES6)
const getCheckedRadioValue = (name) => {
const radios = document.getElementsByName(name);
try {
// calling .value without a "checked" property will throw an exception.
return Array.from(radios).find((r, i) => radios[i].checked).value
} catch(e) { }
}
getCheckedRadioValue('userRoles');
JsFiddle Example
JS (Without ES6)
function getCheckedRadioValue(name) {
var radios = document.getElementsByName(name);
var val;
for (var i = 0, len = radios.length; i < len; i++) {
if (radios[i].checked) {
val = radios[i].value;
break;
}
}
return val; // return value of checked radio or undefined if none checked
}
getCheckedRadioValue('userRoles');
JsFiddle Example
References
Array.prototype.forEach()
Array.from()
Array.prototype.find()

Not exactly sure what you are trying to do, so here is what I'm guessing:
Need to determine the value of a checked radio input
Need to enable a submit button that's determined by a checked radio
Need to effectively call upon other functions, run additional interactions, etc. depending on what was specifically checked.
Details are commented in Snippet
SNIPPET
// Reference #roles
var form = document.getElementById('roles');
/* Register the change element to #roles
|| When clicked...
*/
form.addEventListener('change', function(e) {
/* Determine if the e.target (radio that's clicked)
|| is NOT e.currentTarget (#roles)
*/
if (e.target !== e.currentTarget) {
// Assign variable to e.target
var target = e.target;
// Find the textNode next to target
var label = target.nextSibling;
// Reference the #display
var display = document.getElementById('display');
// Display the <label>s text and radio value
display.value = label.textContent + ' - Rank: ' + target.value;
// Reference the submit button
var btn = document.querySelector('[type=submit]');
// Enable submit button
btn.disabled = false;
// call rolrDist() passing the target,value
roleDist(target.value);
}
}, false);
function roleDist(rank) {
switch (rank) {
case '4':
alert('Rank 4 - Limited Access');
// Take user to landing page
break;
case '3':
alert('Rank 3 - Basic Access');
// Take user to dashboard
break;
case '2':
alert('Rank 2 - Advanced Access');
// Take user to database
break;
case '1':
alert('Rank 1 - Full Access');
// Take user to admin panel
break;
}
}
input,
output,
[type=submit] {
font: inherit;
cursor: pointer;
}
[type=submit] {
float: right;
}
<form id='roles'>
<input type="radio" name="role" value="1">Admin
<input type="radio" name="role" value="2">Manager
<input type="radio" name="role" value="3">Team Leader
<input type="radio" name="role" value="4">User
</form>
<br/>
<label for='display'>Role: </label>
<!--
Since #display and submit button are outside of
the <form>, using the form attribute and the
<form>'s #id as the value establishes an
association between them and <form>
-->
<output id='display' form='roles'></output>
<br/>
<input type='submit' form='roles' disabled>

There is very basic mistake in your markup you should not use elements with same id's in
You can use class instead of id (give class to radioboxes)
document.getElementsByClassName("userRoles")
<input type="radio" class="userRoles" name="userRoles" value="1" onmousedown="checkUrole()">Admin
Rest of your code seems ok

Get value from textbox based on checkbox on change event

I have two textboxes and one checkbox in a form.
I need to create a function javascript function for copy the first txtbox value to second textbox on checkbox change event.
I use the following code but its shows null on first time checkbox true.
function ShiptoBill()
{
var billing = document.getElementById("txtbilling").value;
var shipping = document.getElementById("txtshipping").value;
var check = // here i got checkbox checked or not
if(check == true)
{
// here I need to add the txtbilling value to txtshipping
}
}

Given that form controls can be accessed as named properties of the form, you can get a reference to the form from the checkbox, then conditionally set the value of txtshipping to the value of txtbilling depending on whether it's checked or not, e.g.:
<form>
<input name="txtbilling" value="foo"><br>
<input name="txtshipping" readonly><br>
<input name="sameas" type="checkbox" onclick="
this.form.txtshipping.value = this.checked? this.form.txtbilling.value : '';
"><br>
<input type="reset">
</form>
Of course you might want to set the listener dynamically, the above just provides a hint. You could also conditionally copy the contents over if the user changes them and the checkbox is checked, so a change event listener on txtbilling may be required too.

Try like following.
function ShiptoBill() {
var billing = document.getElementById("txtbilling");
var shipping = document.getElementById("txtshipping");
var check = document.getElementById("checkboxId").checked;
if (check == true) {
shipping.value = billing.value;
} else {
shipping.value = '';
}
}
<input type="text" id="txtbilling" />
<input type="text" id="txtshipping" />
<input type="checkbox" onchange="ShiptoBill()" id="checkboxId" />
function ShiptoBill()
{
var billing = document.getElementById("txtbilling");
var shipping = document.getElementById("txtshipping");
var check = document.getElementById("checkboxId").checked; // replace 'checkboxId' with your checkbox 'id'
if (check == true)
{
shipping.value = billing.value;
}
}

To get the event when it changes, do
$('#checkbox1').on('change',function() {
if($(this).checked) {
$('#input2').val($('#input1').val());
}
});
This checks for the checkbox to have a change, then checks if it is checked. If it is, it places the value of Input Box 1 into the value of Input Box 2.
EDIT: Here's a pure JS solution, and a JSBin too.
function ShiptoBill()
{
var billing = document.getElementById("txtbilling").value;
var shipping = document.getElementById("txtshipping").value;
var check = document.getElementById("thischeck").checked;
console.log(check);
if(check == true)
{
console.log('checked');
document.getElementById("txtshipping").value = billing;
} else {
console.log('not checked');
}
}
with
<input id="thischeck" type="checkbox" onclick="ShiptoBill()">

Validation of Radio buttons in javascript

I have a select list and 2 radio buttons from which a user will select 2 options from each and according to that, the cost of the item will be shown.
*Registration Category:
<select name="catg">
<option>Select..</option>
<option>Student</option>
<option>Student at another institution</option>
<option>Staff</option>
<option>other</option>
Thats my select list.
Yes <input type="radio" name="slides" id="yes" onchange="payment()" />
No <input type="radio" name="slides" id="no" onchange="payment()"/>
<br />
Those are my radio buttons.
<input type="text" size="10" name="cost" readonly/>
<br />
Thats the text box where the cost will show in dollars.
function payment(){
var yes = document.getElementById('yes').checked;
var no = document.getElementById('no').checked;
var catg = formname.catg.selectedIndex;
var cost = formname.cost;
if(catg==1||catg==3 && (yes))
{
cost.value = " 23";
}
else if (catg==1||catg==3 && (no))
{
cost.value = " Free";
}
}
So if a use selects 'Student' or 'Staff' from the select list and 'Yes' from radio buttons, the cost should be $23. I get that to work but if the user selects 'Student' or 'Staff' and then 'No' from the radio buttons, the cost should change to 'Free', which isnt happening.

Working jsfiddle: demo
I added a few things that you left out. I left out the if in after else, you need a condition after that, same as any other if statement.
var formname = document.getElementById('form');
payment = function() {
var yes = document.getElementById('yes').checked;
var no = document.getElementById('no').checked;
var catg = formname.catg.selectedIndex;
var cost = formname.cost;
if (catg == 1 || catg == 3 && (yes)) {
cost.value = " 23";
} else {
cost.value = " Free";
}
}
note: the function is declared without var (and not like this: function payment(), which is the same as far as scoping goes) because in jsfiddle the scope there is not the window. In your code you can write it like that if it's in the global (window) scope.

according to http://jsfiddle.net/WeyLJ/8/
if ((catg == 1 || catg == 3) && (yes))
you need bracket around your || in your if condition.
i heard there is a trick in javascript which make the condition if( a || b ||c & d ||e ) be true because "a || b" is true and it wont check the rest of the condition.
but there still be a probleme with your else if with no else. check the comment of your question or the code.

entry in input one by one should show added result in result field

when user select any option in radio buttons in group one and then enter any number in respective input field and then select the next any radio option and enter any value in input field then this time it should add the new result with old one and display it in result input field and now if he empty any input field then that should also minus from the total result and display it in result field.
i have so many groups like that but here i just put two of them to get the result.
here id the FIDDLE
here is the jquery code. i can work in jquery but not very good i used separate code for every group and i know there must be a way to get this whole functionality through generic code but again i am not good at jquery
jQuery("#txt_im").keyup(setValue);
jQuery('[name="rdbtn-im"]').change(setValue);
function setValue() {
var txt_value = jQuery("#txt_im").val();
var rad_val = jQuery('[name="rdbtn-im"]:checked').val();
if(!txt_value.length) {
jQuery('#final_res').val('');
return;
}
if (!rad_val.length) return;
var res = txt_value * rad_val;
var final = parseInt(res, 10);
var MBresult = final / 1024;
jQuery('#final_res').val(MBresult.toFixed(2));
}
var final2 = 0;
jQuery("#txt_fb").keyup(setValue2);
jQuery('[name="rdbtn-fb"]').change(setValue2);
function setValue2() {
var txt_value = jQuery("#txt_fb").val();
var rad_val = jQuery('[name="rdbtn-fb"]:checked').val();
if(!txt_value.length) {
jQuery('#final_res').val('');
return;
}
if (!rad_val.length) return;
var res2 = txt_value * rad_val;
final2 = parseInt(res2, 10) + final;
var MBresult = final2 / 1024;
jQuery('#final_res').val(MBresult.toFixed(2));
}
infact user is free to select any number of groups or also free to remove any number of group after selection.
i know there is error in fiddle when user select 2nd group after the select of first it removes the result which is wron and i tried to solve it but failed but i define the whole seen what i need to do. i will be very thankfull to you for this kind favour.

HTML:
<table>
<tr>
<td>
<input type="radio" name="rdbtn-im" id="rdbtn-im-day" value="25" class="rdbtn-style-social" />Daily
<input type="radio" name="rdbtn-im" id="rdbtn-im-week" value="175" class="rdbtn-style-social" />Weekly
<input type="text" name="txb3" id="txt_im" class="txt-email" style="width:100px;margin: 2px;" />
</td>
</tr>
<tr>
<td class="sec-td-rdbtns-social">
<input type="radio" name="rdbtn-fb" id="rdbtn-fb-day" value="3500" class="rdbtn-style-social" />Daily
<input type="radio" name="rdbtn-fb" id="rdbtn-fb-week" value="500" class="rdbtn-style-social" />Weekly
<input type="text" name="txb1" id="txt_fb" class="txt-email" style="width:100px;margin: 2px;" /> </td>
</tr>
</table>
<br>result
<input type="text" name="final_res" id="final_res" class="" style="width:100px;margin: 2px;" />
Jquery:
jQuery(".txt-email").keyup(setValue);
jQuery('.rdbtn-style-social').change(setValue);
function setValue() {
var total = 0;
$(".rdbtn-style-social:checked").each(function () {
var myInput = $(this).siblings(".txt-email").val();
if (myInput.length) {
total += myInput * $(this).val();
}
});
if (total) {
jQuery('#final_res').val((total / 1024).toFixed(2));
} else {
jQuery('#final_res').val('');
}
}
FIDDLE

If you are using chrome, then console is your best friend ( https://developers.google.com/chrome-developer-tools/docs/console )
For firefox you have firebug, opera has dragonfly (or something like that ?). Even IE has console now. There you can see all errors popping up.
Ok, so first of all let's clean up this a little bit by wrapping it all in closure (we can now safely use the $ instead of jQuery even if there is namespace conflict outside). Also, we will use single function for both cases, because they are so similar.
!function ($) {
$(".txt-email").keyup(setValue);
$('.rdbtn-style-social').change(function(e) { setValue(e, true) });
function setValue(e, radio) {
if('undefined' === typeof radio) radio = false;
var attr = radio ? 'name' : 'id';
var tmp = e.target[attr].split('-');
var media = tmp[tmp.length - 1];
var txt_value = $("#txt-"+media).val();
var rad_val = $('.rdbtn-style-social[name="rdbtn-'+media+'"]:checked').val();
if (!txt_value.length || !rad_val.length) {
$('#final_res').val('');
return false;
}
var res = (txt_value | 0) * rad_val;
var final = parseInt(res, 10);
var MBresult = final / 1024;
$('#final_res').val(MBresult.toFixed(2));
}
}(jQuery);
(variable | 0 is same as parseInt(variable, 10)).
So, long story short: when radio or text gets changed, the function is fired (if it's radio, additional argument is passed). We retrieve whether we want to work on im or fb, then do whatever you want. I changed id of inputs to replace _ with -'s (for split consistency)
Final jsfiddle: http://jsfiddle.net/Misiur/f6cxA/1/

Checking Value of Radio Button Group via JQUERY?

This may seem silly and downright stupid but I can't seem to figure out how to check the value of a radio button group in my HTML form via JavaScript. I have the following code:
<input type="radio" id="genderm" name="gender" value="male" />
<label for="genderm">Male</label>
<input type="radio" id="genderf" name="gender" value="female" />
<label for="genderf">Female</label>
How do I retrieve the value of gender via JavaScript?

Use document.querySelector() if you want to avoid frameworks (which I almost always want to do).
document.querySelector('input[name="gender"]:checked').value

In pure Javascript:
var genders = document.getElementsByName("gender");
var selectedGender;
for(var i = 0; i < genders.length; i++) {
if(genders[i].checked)
selectedGender = genders[i].value;
}
update
In pure Javascript without loop, using newer (and potentially not-yet-supported) RadioNodeList :
var form_elements = document.getElementById('my_form').elements;
var selectedGender = form_elements['gender'].value;
The only catch is that RadioNodeList is only returned by the HTMLFormElement.elements or HTMLFieldSetElement.elements property, so you have to have some identifier for the form or fieldset that the radio inputs are wrapped in to grab it first.

If you are using a javascript library like jQuery, it's very easy:
alert($('input[name=gender]:checked').val());
This code will select the checked input with gender name, and gets it's value. Simple isn't it?
Live demo

To get the value you would do this:
document.getElementById("genderf").value;
But to check, whether the radio button is checked or selected:
document.getElementById("genderf").checked;

If you wrap your form elements in a form tag with a name attribute you can easily get the value using document.formName.radioGroupName.value.
<form name="myForm">
<input type="radio" id="genderm" name="gender" value="male" />
<label for="genderm">Male</label>
<input type="radio" id="genderf" name="gender" value="female" />
<label for="genderf">Female</label>
</form>
<script>
var selected = document.forms.myForm.gender.value;
</script>

Try:
var selectedVal;
for( i = 0; i < document.form_name.gender.length; i++ )
{
if(document.form_name.gender[i].checked)
selectedVal = document.form_name.gender[i].value; //male or female
break;
}
}

Another solution for ES5+
[...document.getElementsByName("gender")].find(input => input.checked).value;

Without loop:
document.getElementsByName('gender').reduce(function(value, checkable) {
if(checkable.checked == true)
value = checkable.value;
return value;
}, '');
reduce is just a function that will feed sequentially array elements to second argument of callback, and previously returned function to value, while for the first run, it will use value of second argument.
The only minus of this approach is that reduce will traverse every element returned by getElementsByName even after it have found selected radio button.

function myFunction() {
document.getElementById("text").value='male'
document.getElementById("myCheck_2").checked = false;
var checkBox = document.getElementById("myCheck");
var text = document.getElementById("text");
if (checkBox.checked == true){
text.style.display = "block";
} else {
text.style.display = "none";
}
}
function myFunction_2() {
document.getElementById("text").value='female'
document.getElementById("myCheck").checked = false;
var checkBox = document.getElementById("myCheck_2");
var text = document.getElementById("text");
if (checkBox.checked == true){
text.style.display = "block";
} else {
text.style.display = "none";
}
}
Male: <input type="checkbox" id="myCheck" onclick="myFunction()">
Female: <input type="checkbox" id="myCheck_2" onclick="myFunction_2()">
<input type="text" id="text" placeholder="Name">