Dropdown execute action onChange

1. How do I get a dropdown value Onchange?
2. How to use onchange event in JavaScript for dropdown?

How do I get a dropdown value Onchange?

The HTML Select DropDownList has been assigned a jQuery OnChange event handler. When an item is selected in the HTML Select DropDownList, the jQuery OnChange event handler is executed within which the Text and Value of the selected item is fetched and displayed in JavaScript alert message box.

How to use onchange event in JavaScript for dropdown?

A JavaScript onchange event handler is usually assigned to the HTML Select DropDownList. The GetSelectedTextValue JavaScript function gets executed whenever an item is selected in the HTML Select DropDownList. The reference of the HTML Select DropDownList is passed as parameter to the onchange event.