# Unobtrusive JavaScript date-picker widgit

## onupdate Demo

onupdate callback demo

The following datePicker has Easter Monday dynamically calculated by the `datePickerController.onupdate` method and the result used to disable the date in question using the datePickers’ `setDisabledDates` method. Additionally, I’ve dynamically updated a stylesheet that displays the calculated Easter Monday date with a red background.

`class=“format-d-m-y divider-dash highlight-days-12 range-low-today no-transparency”`

Date :

View the related “language in the lab” post for this demo.