Dropdown events in javascript

1.  onChange – Occurs after a value is selected from the dropdown.
2.  onFocus – Occurs after the dropdown gains focus. It triggers the JavaScript event before the dropdown is opened.
3. onBlur – Occurs after a value is selected from the dropdown and the focus is removed from it.
4. onKeyDown – Occurs after a keyboard key is released when the dropdown is opened or when the dropdown has the focus.
5. onKeyDown – Occurs after a keyboard key is pressed when the dropdown is opened or when the dropdown has the focus.
6. onClick – Occurs after a dropdown is clicked.
7. onMouseOver – Occurs after the dropdown is hovered with the mouse cursor.
8. onMouseDown – Occurs after the dropdown is clicked. Works similar to the onClick event but it triggers the JavaScript event before the dropdown values are expanded.
9.  onMouseUp – Occurs after the dropdown is clicked and the click button is released.