dom-manipulation

Question 1

What is the className property of element objects?

Answer 1

The className property of the Element interface gets and sets the value of the class attribute of the specified element.

Question 2

How do you update the CSS class attribute of an element using JavaScript?

Answer 2

var cName = elementNodeReference.className;
elementNodeReference.className = cName;

Question 3

What is the textContent property of element objects?

Answer 3

The textContent property of the Node interface represents the text content of the node and its descendants.

Question 4

How do you update the text within an element using JavaScript?

Answer 4

document.getElementById(‘divA’).textContent = ‘This text is different!’;

Question 5

Is the event parameter of an event listener callback always useful?

Answer 5

no

Question 6

Would this assignment be simpler or more complicated if we didn’t use a variable to keep track of the number of clicks?

Answer 6

More difficult

Question 7

Why is storing information about a program in variables better than only storing it in the DOM?