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The Input Checkbox defaultChecked property in HTML is used to return the default value of checked attribute. It has a boolean value which returns true if the checkbox is checked by default, otherwise returns false.

It returns true if the checkbox is checked. The getElementById element selector is used to find an element by id . The boolean checked property exists on checkbox inputs. The isCheckedJQuery function in the code below gets the element by id using the jQuery selector.

A checkbox field's value is either 'TRUE' or 'FALSE' so a validator should accept those values (i.e. a string) and return 'TRUE' , 'FALSE' , null , or undefined .

Return Value: It returns a string value that represents the value of the value attribute of a input checkbox field.

You can also use the below code to get all checked checkboxes values. <script> document.getElementById('btn').onclick = function() { var markedCheckbox = document.querySelectorAll('input[type="checkbox"]:checked'); for (var checkbox of markedCheckbox) { document.body.append(checkbox.value + ' '); } } </script>

Input Checkbox value Property Return the value of the value attribute of a checkbox: var x = document.getElementById("myCheck").value; Change the value associated with the checkbox: document.getElementById("myCheck").value = "newCheckboxValue"; Submitting a form - how to change the value associated with the checkbox:

If a checkbox is marked or checked, it indicates to true; this means that the user has selected the value. If a checkbox is unmarked or not checked, it indicated to false; this means that the user has not selected the value.

In JavaScript, we can access the checkbox element using id, class, or tag name and apply '. checked' to the element, which returns either true or false based on the checkbox is checked.

The Input Checkbox defaultChecked property in HTML is used to return the default value of checked attribute. It has a boolean value which returns true if the checkbox is checked by default, otherwise returns false.

It returns true if the checkbox is checked. The getElementById element selector is used to find an element by id . The boolean checked property exists on checkbox inputs. The isCheckedJQuery function in the code below gets the element by id using the jQuery selector.

A checkbox field's value is either 'TRUE' or 'FALSE' so a validator should accept those values (i.e. a string) and return 'TRUE' , 'FALSE' , null , or undefined .

Return Value: It returns a string value that represents the value of the value attribute of a input checkbox field.

You can also use the below code to get all checked checkboxes values. <script> document.getElementById('btn').onclick = function() { var markedCheckbox = document.querySelectorAll('input[type="checkbox"]:checked'); for (var checkbox of markedCheckbox) { document.body.append(checkbox.value + ' '); } } </script>

Input Checkbox value Property Return the value of the value attribute of a checkbox: var x = document.getElementById("myCheck").value; Change the value associated with the checkbox: document.getElementById("myCheck").value = "newCheckboxValue"; Submitting a form - how to change the value associated with the checkbox:

If a checkbox is marked or checked, it indicates to true; this means that the user has selected the value. If a checkbox is unmarked or not checked, it indicated to false; this means that the user has not selected the value.

In JavaScript, we can access the checkbox element using id, class, or tag name and apply '. checked' to the element, which returns either true or false based on the checkbox is checked.