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Checkbox event handling using pure Javascript Now what we need to do is to attach an event to the checkbox so it checks its state each time it's changed and show the message if it has been unchecked , notice I added a checked property to the checkbox so it is checked by default.

To use the RequiredFieldValidator, you just need to set the ControlToValidate property to the CheckBoxList's ID. This will trigger validation when the user submits and the validation control will validate against the SelectedItem property and return the appropriate validation result.

The validation of the checkbox in javascript can be done using the checked property of the checkbox element. This property returns true when the checkbox is selected. The addEventListener() method can be used to apply the change event to the checkbox to validate whenever the user interacts with the checkbox.

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

Checking if a checkbox is checked 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.

HTML | DOM Input Checkbox required Property It returns the Input Checkbox required property. checkboxObject.required. It is used to set the Input Checkbox required property. checkboxObject.required = true|false.

Syntax: It returns the Input Checkbox required property. checkboxObject.required. It is used to set the Input Checkbox required property. checkboxObject.required = true|false.