Putting JavaScript to Work: Using Alerts and Prompts

Question 1

alert box

Answer 1

• An alert box is often used if you want to make sure information comes through to the user.
• When an alert box pops up, the user will have to click “OK” to proceed.

Question 2

syntax

Answer 2

• window.alert(“sometext”);
• The window.alert() method can be written without the window prefix.
• Example: alert(“I am an alert box!”);

Question 3

confirm box

Answer 3

• A confirm box is often used if you want the user to verify or accept something.
• When a confirm box pops up, the user will have to click either “OK” or “Cancel” to proceed.
• If the user clicks “OK”, the box returns true. If the user clicks “Cancel”, the box returns false.

Question 4

syntax

Answer 4

• window.confirm(“sometext”);
• The window.confirm() method can be written without the window prefix.
• Example: if (confirm(“Press a button!”)) {
  txt = “You pressed OK!”;
  } else {
  txt = “You pressed Cancel!”;
  }

Question 5

What is the purpose of setting up an Alert?

Answer 5

• Used to alert users of something important
• It is to provide some textual feedback to the user about something in the form of a pop-up window. In essence it “alerts” the user to something.

Question 6

What property can you used to restrict a user’s input?

Answer 6

• type

- Correct, using the type property can restrict a user’s input, for example requiring a number value instead of text.

Question 7

Both an alert and a prompt display a pop-up to the user. How do they differ?

Answer 7

• The alert pop-up only gives you information and the prompt display allows you to type in information
• An alert simply displays a message to the user, where as the prompt actually asks the user for some sort of input.