JS Practice: ITS Certification

What line of code should you use to display each room type on a new line?

• document.getElementById("para").innerHTML += rooms[i] + "<br/>";

• document.getElementById("para").innerHTML += rooms[i] + <br/>;

• document.getElementById("para").innerHTML += rooms[i] ";

• document.getElementById("para").innerHTML = rooms[i] + "<br/>";

Which event attributes should be used to change the text when the mouse hovers over a paragraph?

• onmouseover, onmouseout

• onclick, onchange

• onchange, onmouseup

• onmouseover, onmouseup

How do you access the element with id section1?

• getElementsByTagName('section1')

• getElementById('section1')

• getElementsByName('section1')

• getElementsByClassName('section1')

What line of code correctly appends an item to an existing array fruits?

• push

• append

• add

• insert

How do you handle an exception in JavaScript to ensure a block of code executes regardless of whether an error occurs?

• finally

• done

• complete

• end

Several HTML pages need to reference the same JavaScript code.

Where should the JavaScript code live?

• In a .css file

• Within the head tags of each document

• In a .js file

• Within the body tags of each document

You need to determine whether the variable x is null.

What is the correct syntax?

• x == null

• x == “null”

• x = null

• x typeof null

The page allows users to create a problem ticket and send an email to [e-mail]. The email contains a problem description, the user’s name, and user’s phone number.

You need to perform custom validation of the user’s phone number (yourPhoneNumber) when the page attempts to send the problem ticket (problemTicket).

Which property, method, or event of the form object should you use?

• target

• onclick

• onsubmit

• setCustomValidity

<img src=”images/cottage.jpg” id=”cottage” alt=”Vacation Cottage” style=”width:150px; height:100px”>;

When the user hovers over the image element, the page should call a displayText function. You are writing the code to call the function.

Which code segment should you use?

• document.getElementById(“cottage”).onmouseover = displayText();

• document.getElementById(“cottage”).addEventListener(“mouseover”, displayText());

• document.getElementById(“cottage”).addEventListener(“mouseover”, displayText);

• document.getElementById(“cottage”).addEventListener(“onmouseover”, displayText());

Which JavaScript code fragment will store only the number 42 in the variable iNum as a number?

• var iNum = "42fred";

• var iNum = "42fred"; iNum = iNum.substr(1,2);

• var iNum = "42fred"; iNum = iNum.substr(2,2);

• var iNum = parseInt("42fred");