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To get the state of a checkbox, you follow these steps: First, select the checkbox using a DOM method such as getElementById() or querySelector() . Then, access the checked property of the checkbox element. If its checked property is true , then the checkbox is checked; otherwise, it is not.

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 + ' '); } }

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.

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:

React Js Get Multiple Checkbox Value:To get multiple checkbox values in React. js, you can create a state variable to track the selected checkboxes. Initialize it as an empty array. Then, attach an event handler to each checkbox to update the state when it is checked or unchecked.

To get the multiple checkbox values from the HTML form, the jQuery “validateForm” function() is utilized, which will trigger the form submission. Furthermore, initialize the variable that stores selected items results by using the “map()” function. Then, “document. getElementById().

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 + ' '); } }

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.