jQuery see if any or no checkboxes are selected - javascript

I know how to see if an individual checkbox is selected or not.
But Im having trouble with the following - given a form id I need to see if any of the checkboxes are selected (i.e 1 or more), and I need to see if none are selected. Basically I need two separate functions that answer these two questions. Help would be appreciated. Thanks!
Actually, I would just need a function to tell me if none are selected. Knowing this would answer the other question.

You can use something like this
if ($("#formID input:checkbox:checked").length > 0)
{
// any one is checked
}
else
{
// none is checked
}

JQuery .is will test all specified elements and return true if at least one of them matches selector:
if ($(":checkbox[name='choices']", form).is(":checked"))
{
// one or more checked
}
else
{
// nothing checked
}

You can do this:
if ($('#form_id :checkbox:checked').length > 0){
// one or more checkboxes are checked
}
else{
// no checkboxes are checked
}
Where:
:checkbox filter selector selects all checkbox.
:checked will select checked checkboxes
length will give the number of checked ones there

Without using 'length' you can do it like this:
if ($('input[type=checkbox]').is(":checked")) {
//any one is checked
}
else {
//none is checked
}

This is what I used for checking if any checkboxes in a list of checkboxes had changed:
$('input[type="checkbox"]').change(function(){
var itemName = $('select option:selected').text();
//Do something.
});

Rahul's answer is best fit for your question. Anyway, if you have a group of checkboxes to be checked and not all the checkbox in your form, you can go for it.
Put a classname for all the checkboxes you want to check, say for example, a classname test_check and now you can check if any of the checkbox is checked belonging to the group by:
$("#formID .test_check:checked").length > 0
If it returns true, assume that one or more checkboxes are checked having the classname test_check and none checked if returns false.
Hope it helps someone. Thanks :)-

You can do a simple return of the .length here:
function areAnyChecked(formID) {
return !!$('#'+formID+' input[type=checkbox]:checked').length;
}
This look for checkboxes in the given form, sees if any are :checked and returns true if they are (since the length would be 0 otherwise). To make it a bit clearer, here's the non boolean converted version:
function howManyAreChecked(formID) {
return $('#'+formID+' input[type=checkbox]:checked').length;
}
This would return a count of how many were checked.

This is the best way to solve this problem.
if($("#checkbox").is(":checked")){
// Do something here /////
};

Related

function to push value to array on checkbox OR radio change

I have a function like this:
$('input:checkbox').change(function() {
array = [];
$('input:checkbox:checked').each(function() {
array.push($(this).val()); // push checked checkbox values to array
});
$('input:radio:checked').each(function() {
array.push($(this).val()); // push checked radio values to array
});
someOtherFunction();
});
... which collects values from checkboxes and radio buttons in one array. At the moment it runs when a checkbox changes but I want it to run when a radio button changes too.
As a noob I have no idea where to start so have tried very little. And I didn't find the answer after a good search.
Thanks in advance.
Try with
$('input:checkbox, input:radio').change(function() {
The problem is that your current selector is only applicable for checkboxes.

JQuery: Check if any radio button is checked using radio button class name

I realize similar question had earlier been answered on stack overflow a few times. I checked all the questions and none were similar to mine.
I have a html form that has some radio buttons. In my validation I want to check if atleast one of the radio buttons are checked.
My approach so far:
All radio buttons have same class
All radio buttons have same name
I need to
check if atleast one of the radio button is selecetd
read the value of selected button.
My Javascript so far
function supportFormValidation(){
var isChecked = $('.radioButton').attr('checked')?true:false;
alert(isChecked);
return false;}
This always returns false. But when I try to read vale by individual IDs of each radio button it returns true. Is there any way I can check if a radio button is checked by using the class name.
JSFiddle: http://jsfiddle.net/evj9nch3/
Just use :checked.
var isChecked = !!($('.radioButton:checked').length);
In order to access the checked property you need to use the prop function (after 1.6 anyways). Because the value is either true or false, it's considered a property of the element not an attribute.
Nits answer is a better way of doing it, but look below for the reason why your implementation isn't working.
Take a look at this post for more info
Here is a link to the fiddle
function supportFormValidation() {
var isChecked = $('.radioButton').prop('checked') ? true : false;
alert(isChecked);
return false;
};
supportFormValidation();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type='checkbox' class='radioButton' checked='true' />
You can use this. I checked this is working
$(".ClassName").prop("checked", true)

IF Radio is not selected

I'm working on a e-commerce site and I am having troubles.
I want to check if the user has selected one of the sizes:
var radios = $('input[name=product1]:checked').val();
IF (radios !=='1' || radios !=='2' || radios !=='3' ){
errorMsg += '- Please Choose a Size \n';
}
It does not work and I have no idea why.
I've looked in to it and haven't found a good solution for the problem.
Here is what happens: when I click one of the radio buttons it doesn't seem to catch it. The if statement returns true no matter what I do.
You need && not ||, right now your if statement is always false!
if (radios !=='1' && radios !=='2' && radios !=='3' ){
errorMsg += '- Please Choose a Size \n';
}
You can get the value by:
$('input:radio[name=Product1]:checked').val();
and changing your IF condition to use AND(&&) instead of OR(||).
I think better way of doing this .. You can use the length and equal attribute selector with :checked filter selector like this:
if ($("input[name='product1']:checked").length > 0){
// one or more checkboxes are checked
}
else{
// no checkboxes are checked
}

How can I tell if the checkboxes are checked?

I need to be able to tell if the checkboxes are checked to do some basic validation. Problem: I don't have access to the PHP generating this. There is no class added, or the basic checked=checked that most forms have. What's the easiest way to target the checked boxes?
http://www.inpresence.in/event-registration?ee=4
EDIT: freak out!! here's the code, i just need to target the checked boxes, everything else is working. the :checked method of jquery uses checked=checked within the checkbox, which isn't there.
$(document).ready(function(){
//when the submit button is clicked...
$("input.btn_event_form_submit").click(function(){
//find the value of the drop down with one evening or four evenings
var priceOption = $("#price_option-4").val();
//match a string ending with "one evening" as the first numbers will be randomly generated by php
var oneEvening = /^\d{2}\|One Evening$/.test(priceOption);
//match a string ending with "four evenings" as the first numbers will be randomly generated by php
var fourEvenings = /^\d{2}\|Four Evenings$/.test(priceOption);
//HOW DO I GET THE CHECKED BOXES?!
var checkedBoxCount = $('#dates-1351733097 .valid').is(':checked').length;
//if one evening is selected make sure the checked boxes count does in fact equal one
if(oneEvening && checkedBoxCount != 1){
//if it doesn't alert the user and return false
alert('You must select one date');
return false;
}
//if one evening isn't selected, four is. make sure the count does indeed in 4
else if (fourEvenings && checkedBoxCount != 4){
//if it doesnt alert the user and return to the form
alert('You must select four dates');
return false;
}
//else, everything checks out!
else {
return;
}
});
});
Using this JavaScript code you can check if a checkbox is checked:
var isChecked = document.getElementById("my-checkbox").checked;
Or using jQuery:
var isChecked = $('#my-checkbox').is(':checked');
EDIT: Try this and tell me if it works:
var checkedBoxCount = $('#dates-1351733097 .valid:checked').length;
Have you tried using jquery to resolve this?
http://jquery-howto.blogspot.co.uk/2008/12/how-to-check-if-checkbox-is-checked.html
$('#edit-checkbox-id').is(':checked');
use the jquery :checked selector. http://api.jquery.com/checked-selector/
This will give you a boolean in javascript of what you want:
document.getElementById("Nov.12-4_1").checked
You can view source and find the elements to view whatever id's they have.
Other answers: the OP didn't specify that he wanted a jquery answer. If he hasn't used jquery for anything up to this point. I think adding it just for this would be a tad overkill.

Show an element if all radio boxes have a selection in jQuery

I am trying to make a form show/hide a submit button dependant on if all the radio elements have a selection - this is what i've got so far.. Any ideas what i'm doing wrong?
$(document).ready(function() {
$('#submit-btn').hide();
if ($(':radio:checked').length > 0) {//try reach selected radio here
$('#submit-btn').show();
}
});
var count = 0
$(':radio').each(function(){
count++;
});
if ($(':radio:checked').length == count) {
$('#submit-btn').show();
}
This might help your cause..!!
$('.toCheck').length == $('.toCheck:checked').length;
If that evaluates to true, then all input for that selector are checked! :)
This will return true if ANY radio element is checked, which is not what you want.
Unfortunately there is no quick way to deal with radio elements, since even if one is checked the others will not show as checked.
You'll have to manually loop over them.
I worked it out using Robin's snippet with some modification.
I didn't explain properly that each 'question' has a set of 5 radio buttons (my fault) - but the following code does what I need now.
Essentially the same as Robins except as each question has 5 radio boxes I divide the length by 5 and it works now! Thank you everyone :)
$(document).ready(function() {
$('#submit-btn').hide();
$("form input:radio").change(function() {
var questions = ($('.questions').length / 5);
var checked = ($('.questions:checked').length);
if (questions == checked)
{
$('#submit-btn').show();
}
});
});

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