onChange event should be attached to the input elements to make it dynamic.TrueFalse

When onchange event will occurs ?

The controlled forms are forms where  the value of the input form elements is controlled by React.TrueFalse

Have a String Field (Requester Email ID) , and onchange of requester email id other details such as user name, department etc should populate.When i change the email id and place the cursor outside of the filed (just clicking on the form anywhere) the script is working before Save and values are capturing after SAVE at the backend. The Issue is i am changing the email id (curser is still inside the field) and click on Save the Onchange script is not triggering. While loading i can see the changed values but the form shows the old values after Save.

How do you attach an event handler to a form element in JavaScript?element.addEventListener()element.setEventHandler()element.addEvent()element.onEvent()

<div class="container"> <div class="calculator"> <form> <div class="display"> <input type="text" name="display" disabled> </div> <div> <input type="button" value="AC" onclick="display.value =''" class="ac"> <input type="button" class="del" value="Del" onclick="display.value =display.value.toString().slice (0,-1)"> <input type="button" class="symbols" value="." onclick="display.value +='.'"> <input type="button" class="symbols" value="/" onclick="display.value +='/'"> </div>