Controlling the Open State
The DropDownList enables you to control the state of its options list.
To set the state of the list:
You can also retrieve the current open state of the options list by using the isOpen getter.
Setting the Initially Opened Component
You can enable the user to manually toggle between the open and close state of the options list by setting the toggle method. If set to true, the method defines that the options list is open. If set to false, the method defines that the options list is closed.
The following example demonstrates how to configure an initially opened DropDownList.
Preventing Opening and Closing
The open and close events are emitted right before the options list is about to open or close. To prevent the corresponding action, call the preventDefault method of the event argument.
The following example demonstrates how to prevent the closing of the options list.