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Selecting using CSS selector :checked There is another way to select all checked checkboxes of a group. It is by using a CSS selector. :checked is a pseudo CSS selector which can select the checkbox which is checked. Use this with the querySelectorAll() method to select all checkboxes of a group.

How to Read if a Checkbox is Checked in PHP Using the isset() function. Using the $_POST or $_GET superglobal. Using a value attribute and the in_array() function.

There are two events that you can attach to the checkbox to be fired once the checkbox value has been changed they are the onclick and the onchange events.

Different JavaScript codes to get marked checkboxes value <script> document.getElementById('btn').onclick = function() { var markedCheckbox = document.getElementsByName('pl'); for (var checkbox of markedCheckbox) { if (checkbox.checked) document.body.append(checkbox.value + ' '); } }

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>

To get the checkbox value when it is checked or unchecked use the onchange event by calling a method in onchange event using lambda expression and passing the checkbox value to it.

How to get Checkboxlist checked items values in asp.net c#. string selectedItems = ??; for (int i = 0; i < CheckBoxList1.Items.Count; i++) { if (CheckBoxList1.Items[i].Selected) selectedItems += CheckBoxList1.Items[i].Value.ToString() + ?,?; } selectedItems = selectedItems.TrimEnd(',');