How to Check Whether a Checkbox Is Checked in Jquery

jQuery: Test if checkbox is NOT checked

One reliable way I use is:

if($("#checkSurfaceEnvironment-1").prop('checked') == true){
    //do something
}

If you want to iterate over checked elements use the parent element

$("#parentId").find("checkbox").each(function(){
    if ($(this).prop('checked')==true){ 
        //do something
    }
});

More info:

This works well because all checkboxes have a property checked which stores the actual state of the checkbox. If you wish you can inspect the page and try to check and uncheck a checkbox, and you will notice the attribute "checked" (if present) will remain the same. This attribute only represents the initial state of the checkbox, and not the current state. The current state is stored in the property checked of the dom element for that checkbox.

See Properties and Attributes in HTML

Check if checkbox is checked with jQuery

IDs must be unique in your document, meaning that you shouldn't do this:

<input type="checkbox" name="chk[]" id="chk[]" value="Apples" />
<input type="checkbox" name="chk[]" id="chk[]" value="Bananas" />

Instead, drop the ID, and then select them by name, or by a containing element:

<fieldset id="checkArray">
    <input type="checkbox" name="chk[]" value="Apples" />

    <input type="checkbox" name="chk[]" value="Bananas" />
</fieldset>

And now the jQuery:

var atLeastOneIsChecked = $('#checkArray:checkbox:checked').length > 0;
//there should be no space between identifier and selector

// or, without the container:

var atLeastOneIsChecked = $('input[name="chk[]"]:checked').length > 0;

How do I check whether a checkbox is checked in jQuery?

This worked for me:

$get("isAgeSelected ").checked == true

Where isAgeSelected is the id of the control.

Also, @karim79's answer works fine. I am not sure what I missed at the time I tested it.

Note, this is answer uses Microsoft Ajax, not jQuery

jQuery if checkbox is checked

if ($('input.checkbox_check').is(':checked')) {

Checking the checkbox in jquery

You need to use the .is() method and the :checked selector.

On clicking of a checkbox - you iterate over the checkboxes with the required class (using the .each() method) and can test each to see if its checked or not.

Note the little ternary equation in there to demonstrate an alternative to the traditional if/ else block - but it does the same thing (the "?" line is equivalent to true and the ":" is equivalent to false / else....

EDIT - I have updated the function to match your needs. Basically you need to check if all the checkboxes are checked and if so - submit the form and if not - raise the error modal.

The following amended code should do that for you.

$('input[type="checkbox"]').click(function(){

let total = 0;
let checked = 0;

  $('.checkboxRequired').each(function(index){
    total += 1;
    if( $(this).is(':checked') ) {checked +=1 }
  })
  
  total === checked 
    ? ($('.orderForm').submit(), console.log('Form Submitted'))
    : $('#errorModal').modal('show');
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>


<label> <input type="checkbox" class="checkbox checkboxRequired"/> Checkbox 1</label><br/>
<label> <input type="checkbox" class="checkbox "/> Checkbox 2</label><br/>
<label> <input type="checkbox" class="checkbox checkboxRequired"/> Checkbox 3</label><br/>
<label> <input type="checkbox" class="checkbox checkboxRequired"/> Checkbox 4</label><br/>
<label> <input type="checkbox" class="checkbox "/> Checkbox 5</label>

<!-- form
<form class="orderForm"  method="post"></form>
-->

<!-- Modal -->
<div id="errorModal" class="modal fade" role="dialog">
  <div class="modal-dialog modal-sm">

    <!-- Modal content-->
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal">×</button>
        <h4 class="modal-title">Error Modal Header</h4>
      </div>
      <div class="modal-body">
        <p>There is a disturbance in the force..... not all required checkboxes are checked</p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
      </div>
    </div>

  </div>
</div>

jQuery or js check if checkbox is checked

Your code work on page load but if you want to run it on check/uncheck of checkbox, you should put it in onchange event handler of checkbox

$("#isgdpr").change(function(){
  if ($(this).is(':checked'))
    alert('Checked!');
});

$("#isgdpr").change(function(){  if ($(this).is(':checked'))    console.log('Checked!');});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><label class="switch">  <input type="checkbox" id="isgdpr"></label>

Setting checked for a checkbox with jQuery

Modern jQuery

Use .prop():

$('.myCheckbox').prop('checked', true);
$('.myCheckbox').prop('checked', false);

DOM API

If you're working with just one element, you can always just access the underlying HTMLInputElement and modify its .checked property:

$('.myCheckbox')[0].checked = true;
$('.myCheckbox')[0].checked = false;

The benefit to using the .prop() and .attr() methods instead of this is that they will operate on all matched elements.

jQuery 1.5.x and below

The .prop() method is not available, so you need to use .attr().

$('.myCheckbox').attr('checked', true);
$('.myCheckbox').attr('checked', false);

Note that this is the approach used by jQuery's unit tests prior to version 1.6 and is preferable to using $('.myCheckbox').removeAttr('checked'); since the latter will, if the box was initially checked, change the behaviour of a call to .reset() on any form that contains it – a subtle but probably unwelcome behaviour change.

For more context, some incomplete discussion of the changes to the handling of the checked attribute/property in the transition from 1.5.x to 1.6 can be found in the version 1.6 release notes and the Attributes vs. Properties section of the .prop() documentation.

how to check dynamically created checkbox is checked using jquery

Your code is not working because your event handler is created before the dynamic checkboxes are. To bypass this, you can bind an event handler to the whole document or, for better performance, to the parent that contains all your checkboxes :

$(document).on('change',"input[type='checkbox']",function () {

    // your code here...

});

check whether checkbox is checked or not using jquery

First, don't use javascript: in event handler attributes. It's wrong and only works because it happens to be valid JavaScript syntax. Second, your id is not valid. Parentheses are not allowed in the id attribute (in HTML 4 at least; HTML 5 lifts this restriction). Third, if you're using jQuery it probably makes sense to use its click() method to handle the click event, although be aware that changing it to do that will mean that if the user clicks on the checkbox before the document has loaded then your script won't handle it.

<input type="checkbox" id="Public_Web" checked value="anyone"
    name="data[anyone]">

$(document).ready(function() {
    $("#Public_Web").click(function() {
        if (this.checked) {
            alert("Checked!");
        }
    });
});