jQuery Check if Checkbox is Checked

There are a number of different ways to check if a checkbox is checked (ticked). You can use either jQuery or plain JavaScript it doesn’t really matter. Here are 3 examples to wet your appetite. Could be useful when you need to check that a user has ticked a checkbox before submitting a form.

Check if a checkbox IS CHECKED

// First way 
$('#checkBox').attr('checked'); 

// Second way 
$('#edit-checkbox-id').is(':checked'); 

// Third way for jQuery 1.2
$("input[@type=checkbox][@checked]").each( 
    function() { 
       // Insert code here 
    } 
);
// Third way == UPDATE jQuery 1.3
$("input[type=checkbox][checked]").each( 
    function() { 
       // Insert code here 
    } 
);

Check if a checkbox IS NOT CHECKED

if ($('input[name=termsckb]').attr('checked') != true) {
	$('#captcha-wrap').hide();
}

if ($('#email_ckb').attr('checked') != true) {
	$('#captcha-wrap').hide();
}

Frequently Asked Questions (FAQs) about jQuery Checkbox Checking

How can I check if a checkbox is checked using jQuery?

To check if a checkbox is checked using jQuery, you can use the .is() function with the :checked selector. Here’s an example:

if ($('#checkbox_id').is(':checked')) {
// Checkbox is checked.
} else {
// Checkbox is not checked.
}
In this code, ‘#checkbox_id’ is the id of your checkbox. The .is() function returns true if the checkbox is checked and false if it’s not.

How can I check or uncheck a checkbox using jQuery?

To check or uncheck a checkbox using jQuery, you can use the .prop() function. Here’s how you can do it:

// To check a checkbox.
$('#checkbox_id').prop('checked', true);

// To uncheck a checkbox.
$('#checkbox_id').prop('checked', false);
In this code, ‘#checkbox_id’ is the id of your checkbox. The .prop() function sets the checked property of the checkbox to either true (checked) or false (unchecked).

How can I toggle a checkbox using jQuery?

To toggle a checkbox using jQuery, you can use the .click() function. Here’s an example:

$('#checkbox_id').click();
In this code, ‘#checkbox_id’ is the id of your checkbox. The .click() function simulates a mouse click on the checkbox, which toggles its checked state.

How can I get the value of a checked checkbox using jQuery?

To get the value of a checked checkbox using jQuery, you can use the .val() function. Here’s how you can do it:

var value = $('#checkbox_id:checked').val();
In this code, ‘#checkbox_id’ is the id of your checkbox. The .val() function returns the value of the checked checkbox.

How can I handle the change event of a checkbox using jQuery?

To handle the change event of a checkbox using jQuery, you can use the .change() function. Here’s an example:

$('#checkbox_id').change(function() {
if ($(this).is(':checked')) {
// Checkbox is checked.
} else {
// Checkbox is not checked.
}
});
In this code, ‘#checkbox_id’ is the id of your checkbox. The .change() function is triggered when the state of the checkbox changes.

How can I select all checkboxes using jQuery?

To select all checkboxes using jQuery, you can use the :checkbox selector. Here’s how you can do it:

$('input:checkbox').prop('checked', true);
In this code, ‘input:checkbox’ selects all checkboxes. The .prop() function sets the checked property of all checkboxes to true, which checks them.

How can I deselect all checkboxes using jQuery?

To deselect all checkboxes using jQuery, you can use the :checkbox selector. Here’s an example:

$('input:checkbox').prop('checked', false);
In this code, ‘input:checkbox’ selects all checkboxes. The .prop() function sets the checked property of all checkboxes to false, which unchecks them.

How can I enable or disable a checkbox using jQuery?

To enable or disable a checkbox using jQuery, you can use the .prop() function. Here’s how you can do it:

// To enable a checkbox.
$('#checkbox_id').prop('disabled', false);

// To disable a checkbox.
$('#checkbox_id').prop('disabled', true);
In this code, ‘#checkbox_id’ is the id of your checkbox. The .prop() function sets the disabled property of the checkbox to either false (enabled) or true (disabled).

How can I check if a checkbox is enabled or disabled using jQuery?

To check if a checkbox is enabled or disabled using jQuery, you can use the .is() function with the :disabled selector. Here’s an example:

if ($('#checkbox_id').is(':disabled')) {
// Checkbox is disabled.
} else {
// Checkbox is enabled.
}
In this code, ‘#checkbox_id’ is the id of your checkbox. The .is() function returns true if the checkbox is disabled and false if it’s enabled.

How can I handle the click event of a checkbox using jQuery?

To handle the click event of a checkbox using jQuery, you can use the .click() function. Here’s how you can do it:

$('#checkbox_id').click(function() {
if ($(this).is(':checked')) {
// Checkbox is checked.
} else {
// Checkbox is not checked.
}
});
In this code, ‘#checkbox_id’ is the id of your checkbox. The .click() function is triggered when the checkbox is clicked.