Answered: What does the JavaScript expression…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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What does the JavaScript expression document.getElementById("numberOfParticipants").value = 0; do?

	a.	results in an error because of incorrect syntax
	b.	returns a Boolean true if the value of the input control with the id “numberOfParticipants” is 0
	c.	retrieves the value entered by the user for the input control with the id “numberOfParticipants”
	d.	sets the value of the input control with the id “numberOfParticipants” to 0

How do you use an event listener to trigger execution of an anonymous function?

	a.	Include the anonymous function within the addEventListener() method, but omit the curly braces.
	b.	You can’t; you can use anonymous functions with event handlers but not with event listeners.
	c.	Pass the name of the function as the function argument to the addEventListener() method.
	d.	Insert the entire structure of the anonymous function as the function argument for the addEventListener() method.

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