Скачать или смотреть How to dynamically disable and enabled form button using Javascript, HTML, and CSS

dropdown enable or disable in JavaScript with buttons
Dropdown menus are frequently used in web development to present users with a variety of alternatives. However, in other cases, you may want to enable or disable a dropdown based on specific conditions. In this tutorial, we'll look at how to implement this functionality using JavaScript and checkboxes. By the conclusion, you'll understand how to dynamically manage the behavior of dropdowns in your online apps.

To enable a dropdown using JavaScript and buttons, follow these instructions. First, you must access the checkbox element using its ID or another selector. Then, listen for the change event on the checkbox to see if it is checked or unchecked. When the checkbox is ticked, use the dropdown element's disabled attribute to activate it so that users may interact with it. When the checkbox is unchecked, set the disabled property to true, which will disable the dropdown.