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    an event handler is an example of which type of programming component

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    What is an event handler and how does it work?

    An event handler dictates the action that takes place in a software program after an event. In this article, we explain how event handlers work.

    DEFINITION

    event handler

    Katie Terrell Hanna

    What is an event handler?

    In programming, an event handler is a callback routine that operates asynchronously once an event takes place. It dictates the action that follows the event. The programmer writes a code for this action to take place.

    An event is an action that takes place when a user interacts with a program. For example, an event can be a mouse click or pressing a key on the keyboard. An event can be a single element or even an HTML document.

    Let's say a mouse click on a button displays the message "DOM Event." The event handler will be the programmed routine whereby each time a user clicks on the button, the message "DOM Event" is displayed.

    An event is a meaningful element of application information from an underlying development framework. There are many types of events, either from a graphical user interface (GUI) toolkit or some input-type routine.

    On the GUI side, events include keystrokes, mouse activity, action selections or timer expirations. On the input side, events include opening or closing files and data streams, reading data and so forth.

    Here are some common examples of an event handler:

    A notification pops up on a webpage when a new tab is opened.

    A form is submitted when the submit button is clicked.

    The background color changes on a mouse click.

    An event-driven application design and deployment paradigm, serverless computing allows developers to create event handling routines, process data, code and build back-end applications without concern for underlying computing resources.

    How to program an event 

    The actions succeeding the event can be programmed using JavaScript code. This is embedded in the HTML code of the website.

    Let's take the above example, where an action occurs after the user clicks on a button. Such an event is known as a click event. Typically, web events form a part of the browsers' application program interface (API).

    The general syntax for a handler is: 

    What Is JavaScript?

    Today, the standard way of registering an event handler is using the addEventListener() method. For this, the programmer needs to specify the event's name and the function that responds to it.

    Some software architectures operate almost entirely by producing, managing and consuming events. Nearly all software architectures must include some event handling capabilities, if only to deal with out-of-bounds conditions and errors.

    The difference between event handlers and event listeners 

    The terms event handler and event listener are often used interchangeably. However, there is a slight difference between the two. These are two ways of handling events.

    When a code runs after an event takes place, this is known as registering an event handler. On the other hand, the event listener listens to the event and then triggers the code for handling the event.

    See also: event-driven application, event-driven architecture (EDA), event handling, event forwarding, complex event processing, business event management, event stream processing.

    This was last updated in January 2022

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    67 Qs

    Show Answers See Preview 1. Multiple-choice 30 seconds 5 pts Q.

    Jackson has brainstormed several ideas for his game. He is now trying to plan the scenes, animations and character interactions. Which step in the game design should Jackson complete to help him develop his ideas?

    answer choices

    Create a storyboard.

    Brainstorm more game ideas.

    Hire a programmer.

    Develop the game prototype.

    2. Multiple-choice 30 seconds 5 pts Q.

    Marissa would like to learn more about game design. Her teacher explains that the first step is to learn how the audience, elements and characters in a game work together. What is the best method for completing this first step?

    answer choices

    Develop a game with multiple elements and characters.

    Analyze existing games by deconstructing them.

    Ask your friends for feedback about your game ideas.

    Make a list of the characters in other games you have played

    3. Multiple-choice 30 seconds 5 pts Q.

    Jason is playing a game in which players must maneuver around changing barriers and moving objects inside a maze. This is an example of which type of game?

    answer choices Role playing Skill Board Chance 4. Multiple-choice 30 seconds 5 pts Q.

    Which programming element is used by a game program to track and display score information?

    answer choices Prototypes Algorithms Variables Events 5. Multiple-choice 30 seconds 5 pts Q.

    Which type of error can be difficult to identify, because the program still runs but does not do what you expect it to do?

    answer choices Logic error Runtime error

    A program with any type of error cannot still run.

    Syntax error 6. Multiple-choice 30 seconds 5 pts Q.

    Which member of the game design team writes the dialog for the characters, and develops the animation and scenarios that occur during game play?

    answer choices IT specialist Game designer Programmer Sound engineer 7. Multiple-choice 30 seconds 5 pts Q.

    The actions that you want your game to perform and the goals that you want players to be able to achieve in your game are called the:

    Consider the following example: Problem: Cassidy has 15 tokens. Sierra has 10 tokens. Cassidy gives Sierra 2 tokens. How many more tokens does Cassidy have than Sierra?

    answer choices criteria. interactivity. constraints. analysis. 8. Multiple-choice 30 seconds 5 pts Q. Solution:

    Cassidy's tokens: 15

    Subtract 2 tokens from Cassidy's total tokens:

    15– 2 = 13 Sierra's tokens: 10

    Add 2 tokens to Sierra’s tokens:

    10 + 2 = 12

    Subtract Cassidy’s total tokens from Sierra’s total tokens:

    13 – 12 =1

    Answer: Cassidy has one more token than Sierra. Which term describes the step-by-step instructions that appear under "Solution" in the example above?

    answer choices Routine Loop Algorithm Storyboard 9. Multiple-choice 30 seconds 5 pts Q.

    Study the example. Which term describes this game design element?

    answer choices Programming Storyboard Feedback Brainstorm 10. Multiple-choice 30 seconds 5 pts Q.

    In programming languages, character, string, integer, floating-point and Boolean are all examples of:

    answer choices

    variable data types.

    comparison operators.

    Consider the following instructions:Move Forward

    methods. expressions. 11. Multiple-choice 30 seconds 5 pts Q. Repeat Move Forward

    10 timesWhich two types of programming structures are included in this example?

    answer choices

    Sequential and object-oriented

    Object-oriented and looping

    Sequential and looping

    Looping and selection

    12. Multiple-choice 30 seconds 5 pts Q.

    Which term describes the process used to plan every step of a game's animation?

    answer choices Brainstorm Storyboard Prototype Project 13. Multiple-choice 30 seconds 5 pts Q.

    Which member of the game design team writes the step-by-step computer instructions, or code, required to create games?

    answer choices Game designer IT specialist Programmer Sound engineer 14. Multiple-choice 30 seconds 5 pts Q.

    Which term describes the first functional example of a game that you are developing?

    answer choices Storyboard Design Project Prototype 15. Multiple-choice 30 seconds 5 pts Q.

    Allison has been asked to create an algorithm that can be used to calculate the area of a rectangle.

    Review the following algorithm:

    Step 1: Measure the length of the rectangle and store result as length.

    Step 2: Measure the width of the rectangle and store result as width.

    Step 3:

    Step 4: Display area of the rectangle.

    Which task would Allison's algorithm need to perform in Step 3?

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    Studying for Gaming Flashcards

    Study with Quizlet and memorize flashcards containing terms like Which type of operators includes the && (AND), || (OR) and ! (NOT) symbols?, Wayne is creating a game that allows a character to jump to the location where the mouse is clicked. Which programming component will Wayne need to use to tell the program what to do when the mouse is clicked, Natalie is creating a game. The object of the game is for the player to get a cat to his toy in 10 moves or less. The game begins with the cat positioned at the top-left corner of the screen and the toy at the bottom-right corner of the screen. Natalie wants the player to be able to make the cat go 50 steps in one move by pressing an arrow key, and go 100 steps in one move by pressing the space bar. The number of remaining moves is decreased by one each time the player presses a key. The game will count down from 10 moves and display the number of moves remaining. If the move count reaches zero or the cat reaches his toy, then the game will start over. Which programming component is needed to tell the program it must do something when a specific key is pressed? and more.

    Studying for Gaming

    3.9 (21 reviews) Term 1 / 28

    Which type of operators includes the && (AND), || (OR) and ! (NOT) symbols?

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    Definition 1 / 28

    Logical (Boolean) operators

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    Created by butterfly633

    Terms in this set (28)

    Which type of operators includes the && (AND), || (OR) and ! (NOT) symbols?

    Logical (Boolean) operators

    Wayne is creating a game that allows a character to jump to the location where the mouse is clicked. Which programming component will Wayne need to use to tell the program what to do when the mouse is clicked

    An event handler

    Natalie is creating a game. The object of the game is for the player to get a cat to his toy in 10 moves or less. The game begins with the cat positioned at the top-left corner of the screen and the toy at the bottom-right corner of the screen. Natalie wants the player to be able to make the cat go 50 steps in one move by pressing an arrow key, and go 100 steps in one move by pressing the space bar. The number of remaining moves is decreased by one each time the player presses a key.

    The game will count down from 10 moves and display the number of moves remaining. If the move count reaches zero or the cat reaches his toy, then the game will start over.

    Which programming component is needed to tell the program it must do something when a specific key is pressed?

    An event for each key

    Your testing group has given you a list of suggestions and issues to help refine your game prototype. Your team has identified the issues and brainstormed solution ideas. Which step in the design process should your team complete next?

    Create and execute the solution

    Which expression contains the NOT operator?

    ! 25 < 10

    Consider the following instructions for a game element:

    Move Forward Repeat Move Forward 10 times

    This is an example of which type of programming structure?

    ...

    Stefan has created a zombie class for his game. He would like the zombie objects to be able to speak, run, appear and disappear. Which programming term describes the actions that Stefan wants his zombie objects to be able to perform?

    ...

    Jackson has brainstormed several ideas for his game. He is now trying to plan the scenes, animations and character interactions. Which step in the game design should Jackson complete to help him develop his ideas?

    Create a storyboard.

    Consider the following example:

    1 Set student to 0

    2 For each student in class, add one to student

    3 Continue until all students in class are counted

    4 Display student

    Which term describes this example?

    An algorithm

    Problem: Cassidy has 15 tokens. Sierra has 10 tokens. Cassidy gives Sierra 2 tokens. How many more tokens does Cassidy have than Sierra?

    Solution:

    Cassidy's tokens: 15

    Subtract 2 tokens from Cassidy's total tokens:

    15- 2 = 13 Sierra's tokens: 10

    Add 2 tokens to Sierra's tokens:

    10 + 2 = 12

    Subtract Cassidy's total tokens from Sierra's total tokens:

    13 - 12 =1

    Answer: Cassidy has one more token than Sierra.

    Which term describes the step-by-step instructions that appear under "Solution" in the example above?

    Algorithm

    Which variable data type is used to store a number that contains a decimal?

    Floating point

    Your team has developed the first draft of a game program. You plan to demonstrate how the game functions to the customer next week. Which term describes the game draft that your team created for demonstration?

    Prototype

    Study the image of chairs and their descriptions. These chairs represent objects or instances created using the Chair class definition

    There is an error in the Chair class definition. Which statement correctly explains the error?

    Objects created using the same class must have the same properties.

    Consider the following pseudo-code:

    When spacebar is pressed, turn left 10 degrees

    Which part of this code segment represents the argument?

    left 10 degrees

    Which statement correctly defines "iteration"?

    A repetition of a process

    In programming languages, character, string, integer, floating-point and Boolean are all examples of:

    Variable data types

    Which term describes the process used to plan every step of a game's animation?

    Storyboard

    Jenna has created a wizard class. She has used the class to build two wizard objects in her game. Which programming term describes the objects that Jenna built using the wizard class?

    Instances

    Which programming term describes the variable that holds the data (value) needed by the method?

    parameter

    You have developed a prototype for your game, and you have gathered a group of people to test the game. Each member of the group has been asked to create and submit a list of suggestions and issues. Which term describes the suggestions and issues that are given to a design team to help improve or refine a game design?

    Feedback

    Which programming element is used by a game program to track and display score information?

    Variables

    Wayne is creating a game that allows a character to jump to the location where the mouse is clicked. Which programming component will Wayne need to use to tell the program what to do when the mouse is clicked?

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