Develop Reference

Make checkboxes required

I already looked to similar questions but I still can't figure out how to fix it. On my webpage, I have some radio checkboxes which I would like to be required before going to the next question.
I have the following partial code:
<p>
Select the option that fits most to you<br><br>
<label>
<input type="radio" name="typesport" value="teamsport" >
I prefer a teamsport</label><br>
<label>
<input type="radio" name="typesport" value="individual">
I prefer an individual sport</label><br>
</p>
Next question
Can someone help me with getting a javascript code, that actually works for all radio-boxes, where you could only go to the next question when 1 radio-box is selected?
Cheers,
Max
Edit: What I've tried so far is the following:
I added "required" to the label, so it looked like this:
<label><input type="radio" name="typesport" value="teamsport" required> I prefer a teamsport</label><br>
I also added the ID to the button:
Next question
Furthermore, I used this JS script:
$(document).ready(function () {
$('#checkBtn').click(function() {
checked = $("input[type=radio]:checked").length;
if(!checked) {
alert("You must check at least one radio.");
return false;
}
});
});
However, this works fine for only one question. When I add this to all the other questions, I still can go to the following question when I click on the button Next question, and that is not what I want.

Radio boxes are fairly simple in nature in that you should always have at least one option in a radio-group checked by default. Preferably a N/A or 'Please Select' option.
In which case you would want to validate against the 'Please Select' option instead:
//when user clicks <a> element
$(".next-button").click(function() {
//group on radio button name and test if checked
if ($("input[name='typesport']:checked").val() == 'select') {
alert('Nothing is checked!');
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>
Select the option that fits most to you<br><br>
<label><input type="radio" name="typesport" value="select" checked="true" > Please Select </label><br>
<label><input type="radio" name="typesport" value="teamsport" > I prefer a teamsport</label><br>
<label><input type="radio" name="typesport" value="individual"> I prefer an individual sport</label><br>
</p>
Next question
However
If you really want to validate that an option has been checked:
This should work:
//when user clicks <a> element
$(".next-button").click(function()
{
//group on radio button name and test if checked
if (!$("input[name='typesport']:checked").val()) {
alert('Nothing is checked!');
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>
Select the option that fits most to you<br><br>
<label><input type="radio" name="typesport" value="teamsport" > I prefer a teamsport</label><br>
<label><input type="radio" name="typesport" value="individual"> I prefer an individual sport</label><br>
</p>
Next question

HTML5 supports the required attribute for radio buttons. I did some searching and HTML5: How to use the "required" attribute with a "radio" input field has more detailed information about this attribute.

You can set a radio button checked by default by using the checked attribute.
To check if it's checked or not, use this code :
if ($('input[name=typesport]').attr('value') != undefined) {
//execute code when it is checked
} else {
//execute code when it's not checked
}

Checkboxes control Radio Checked/Unchecked

I have a checkout page with two radio buttons one for 'Register Account' and 'Guest Account' checkout methods.
I want a single checkbox that when it is checked, it checks the Register Account radio button and when it isn't checked it checks the Guest Account checkout radio button.
Here is my code so far:
http://jsfiddle.net/hQbpZ/160/
HTML:
Remember Me for Future Purposes :<input type="checkbox" id="checkbox1"/> <br/><br/>
Register Account :<input type="radio" id="radio1" name="radio"/><br>
Guest Checkout :<input type="radio" id="radio2" name="radio"/><br>
JS:
jQuery('#checkbox1').click(function(){
jQuery('#radio1').attr('checked', true);
});
jQuery('#checkbox1').click(function(){
jQuery('#radio2').attr('checked', false);
});
I got part of the functionality down but I don't know how to uncheck a radio button when a checkbox is unchecked.

You can do it like this:
jQuery('#checkbox1').click(function () {
jQuery('#radio1').prop('checked', $(this).is(':checked'));
jQuery('#radio2').prop('checked', !$(this).is(':checked'));
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
Remember Me for Future Purposes :
<input type="checkbox" id="checkbox1" />
<br/>
<br/>Register Account :
<input type="radio" id="radio1" name="radio" />
<br>Guest Checkout :
<input type="radio" id="radio2" name="radio" />
<br>

Just add a toggle variable and link the checked attribute to it
http://jsfiddle.net/hQbpZ/163/
var registered = false;
jQuery('#checkbox1').click(function(){
registered = !registered
jQuery('#radio1').attr('checked', registered);
jQuery('#radio2').attr('checked', !registered);
});

It is impossible to manually uncheck radio buttons, simply because they're not meant to be used that way (read more). The only way to have a radio button uncheck is by creating multiple radio buttons sharing the same name tag, meaning your HTML is already correct.
Your JavaScript does need some changes. It is not necessary to bind a function twice to the same event, so you could reduce it to one binding. Inside that binding you check whether the clicked checkbox is now on or off, and depending on that you check one of the two radio buttons, like so:
$('#checkbox1').click(function() {
if($('#checkbox1').prop('checked') === true) {
$('#radio1').attr('checked', true);
} else {
$('#radio2').attr('checked', false);
}
});

jQuery problem with multiple radio selects

I'm trying to validate a form that contains several different radio buttons. A few radio buttons in the form have the same classname 'video_type'.
In the jQuery validation script, after the form is submitted I want to check if any of the radio buttons with the classname 'video_type' have been selected. If the user has selected at least one radio button with the classname 'video_type' and the value as 1, it should return true. Otherwise it should return false.
At the moment I'm using this:
HTML:
<input type="radio" name="video_option_1" class="video_option" value="1">Yes
<input type="radio" name="video_option_1" class="video_option" value="0">No
<input type="radio" name="video_option_2" class="video_option" value="1">Yes
<input type="radio" name="video_option_2" class="video_option" value="0">No
jQuery:
$("#completeOrderForm").submit(function(){
if($(".video_type").val() == 0){
$("#showerrors").show().html("Please select a video type.");
return false;
}
});
But I realise it's incorrect. What do I need to do?

This should work:
if ($(".video_option[value='1']:checked").length == 0) {
$("#showerrors").show().html("Please select a video type.");
return false;
}
Basically you're selecting every element with the class .video_option that have the value 1 ([value='1']) and are checked (using the :checked selector). It then counts the amount of elements selected, if the result is 0 no radio's are checked.
Fiddle: http://jsfiddle.net/bjorn/UwufF/6/
EDIT
You talk about radio buttons with the classname video_type yet the code shows video_option, I went by the code when making the example.

Radio input and alert in Javascript

I need some help.
I have program that changes table values based on user input in radio box
similar to this page:
clicky
But the problem is I want users to select the radio input only once; if they select another
radio then values of tables get messed up.
So what I want to know is how can I make an alert box when user selects the radio input twice?
Similar to this website clicky try clicking radio button twice and alert popsup.
Please can anyone help?

It's difficult to prevent an event on a radio button input node without bringing in help from outside libraries. A simple solution is to just disable the buttons from within an onclick function attached to each input node. Like so: http://jsfiddle.net/c73Mh/ . If they still need to be able to select the radio buttons for whatever reason, you can cancel the selection by selecting the button that was initially selected from within that same function. Hope this helps!

For simplicity in my example I'm assuming that the id of each radio button is a combination of the name and value attributes. In addition to what I've given you below you will need to add a reset() function of some kind that sets selectedValues = {}; and deselects all radio buttons.
<input type="radio" name="group1" value="A" id="group1A" onclick="radioClicked(this);" />First option
<input type="radio" name="group1" value="B" id="group1B" onclick="radioClicked(this);" />Second option
<input type="radio" name="group2" value="A" id="group2A" onclick="radioClicked(this);" />First option
<input type="radio" name="group2" value="B" id="group2B" onclick="radioClicked(this);" />Second option
var selectedValues = {};
function radioClicked(rb) {
if (selectedValues[rb.name] === undefined) {
selectedValues[rb.name] = rb.value;
doTableProcessing();
}
else {
alert("You can't change the selected values");
document.getElementById(rb.name + selectedValues[rb.name]).checked = true;
}
}

Disabling radio button after click

I need some help please
This is the html
<div>
<p>match1</p>
teamA <input type="radio" name="match1" onclick="update('ab');" />
teamB <input type="radio" name="match1" onclick="update('ba');" />
<p>match2</p>
teamC <input type="radio" name="match1" onclick="update('ad');" />
teamD <input type="radio" name="match1" onclick="update('dc');" />
</div>
<script>
update(results){.................}
</script>
I have this html so what I want I to know is
How can I disable the radio button once the user clicks on it
because the update() function changes the values when user clicks on radio button
if he keeps clicking like that then values change each time he clicks
or if he clicks on sibling radio button
so please can anyone tell me how to disable radio button
once user clicks on it
like for instance in match1
if user selects teamA radio button then i want to disable both teamA and teamB radio buttons
same for match2 if he clicks then disable the clciked radio and sibling radio aswell
Thanks for reading this can anyone help me please
I can use plain js, jquery or libraries

Use this:
$(":radio").click(function(){
var radioName = $(this).attr("name"); //Get radio name
$(":radio[name='"+radioName+"']").attr("disabled", true); //Disable all with the same name
});
What we're doing, is, when a user clicks a radio button, disable all radios with the same name.
Hope this helps.
Cheers.

Using Javascript, you can use a solution like this:
document.getElementById("IDOfButtonElement").onclick = function(){
document.getElementById("IDOfButtonElement").disabled=true;
}

jsfiddle example
http://jsfiddle.net/nhZXg/
code
$(":radio").click(function(){
$(this).attr('disabled','disabled');
});
this is the general way of doing it.
jQuery("input:radio").attr('disabled',true);
or
jQuery("input:radio").attr('disabled','disabled');

Try this:
this.setAttribute('disabled','disabled');
I suggest you to add label tag around your inputs. It cause when user clicks on the text radio button changes.
<label>teamA <input type="radio" name="match1" onclick="update('ab');" /></label>

onclick="update('ad', this);"
function onclick(word, element){
$(element).attr('disabled', 'disabled');
}