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Mastering jQuery UI
Mastering jQuery UI

Mastering jQuery UI: Become an expert in creating real-world Rich Internet Applications using the varied components of jQuery UI

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Mastering jQuery UI

Chapter 2. Building a Jigsaw Puzzle Game

Moving forward a bit more, in this chapter, we will see more (and slightly complex) use cases of draggable and droppable components. We will develop a jigsaw puzzle game where we will divide a picture into small pieces of the same size, and the user will have to rearrange these small pieces by dragging and dropping them to form a complete picture.

The UI will have two containers on the page. One container will be used to keep the puzzle pieces, and the other will act as a canvas for arranging these pieces. Initially, users will be displayed a picture along with a Start button. Once the Start button is clicked, the image will be divided into 16 pieces and these pieces will be placed in a separate container. Users will have to drag and drop the individual pieces on the canvas and arrange them to make the complete picture.

Getting ready

Make sure that you have set up jQuery and jQuery UI files as explained in Chapter 1, Designing a Simple Quiz Application. You will also need an image that has dimensions equal to 400px x 400px. The code in this chapter uses an image of a cute cat, named kitty.jpg. Of course, you can use any image of your choice. Keep this image in the Chapter2 folder.

Since we will create 16 pieces of this image, each having both width and height equal to 100 px, keep in mind that the image you choose should not have a single square area of the same color exceeding 100px x 100px. This will create problems while solving the puzzle as you will be unable to determine the correct locations of multiple pieces of the same color.

Creating the layout

Create a file named index.html inside the Chapter2 folder. It will contain the entire HTML. For the JavaScript code, create another file named puzzle.js inside the js folder of Chapter2. Now the Chapter2 folder will have four items: the index.html file, the image file for the puzzle (kitty.jpg), the js folder, and the css folder.

Creating the markup for the puzzle

Our first step towards creating the puzzle will be to prepare the required HTML markup. This HTML markup will then be styled using CSS. The following HTML markup will prepare the bare-bones structure of the page required to make the puzzle:

<html>
  <head>
    <meta charset="utf-8">
    <title>Designing a Jigsaw Puzzle</title>
    <link rel="stylesheet" href="css/ui-lightness/jquery-ui-1.10.4.custom.min.css">
  </head>
  <body>
    <div class="container">
      <div id="pieceBox"></div>

      &lt...

Making the puzzle functional

Before writing any JavaScript code to create a functional puzzle, let's write down the features of our puzzle and see how we will achieve them.

When the page loads, an image will be displayed to the user in puzzleContainer, and a Start button will be displayed under it. The image will actually be a collection of 16 different div elements, each having the same background image but a different background position. Using the background-position CSS property, we will be able to display the complete image to the user. Once the Start button is clicked, we will take these 16 images and place them at random positions inside pieceBox. We will also display a 4 x 4 grid, puzzleContainer, where any of the 16 pieces could be dropped. We will then attach appropriate event handlers that will allow us to drag an individual puzzle piece from pieceBox to puzzleContainer. Once a piece has been moved to puzzleContainer, it cannot be dropped back to pieceBox. It can, however...

Improving the puzzle

This puzzle can be made more interesting in a number of ways. Some ideas have been listed here. You are encouraged to add more features of your own as well:

  • Allow removal of pieces from puzzleContainer to pieceBox
  • Take a rectangular image where number of columns and rows are different
  • Add a countdown timer to check how long the user took to finish the puzzle
  • Display three to four images to users and allow them to select one image to be used with the puzzle

Summary

We made a somewhat complex example in this chapter, where you learned to use some important events of draggable and droppable components. Both of these are important components, and I encourage you to practice and try different variations as much as possible.

In the next chapter, we will look at some other equally useful components such as dialog, tooltip, accordion, and so on.

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Description

If you are a frontend developer with considerable knowledge of jQuery UI and want to take this expertise to the next level, then this book is for you.

Who is this book for?

If you are a frontend developer with considerable knowledge of jQuery UI and want to take this expertise to the next level, then this book is for you.

What you will learn

  • Create mashups using APIs of popular websites such as Reddit and Google Maps
  • Integrate AJAX with different components
  • Create projects that solve realworld problems and are not theoretical
  • Discover the best usage of components in a given situation
  • Use effects to make the UI more interactive
  • Use JSONP to make crossorigin AJAX requests
  • Get to grips with best practices to use while developing with jQuery UI
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Length: 312 pages
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Language : English
ISBN-13 : 9781783286652
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Table of Contents

13 Chapters
1. Designing a Simple Quiz Application Chevron down icon Chevron up icon
2. Building a Jigsaw Puzzle Game Chevron down icon Chevron up icon
3. Creating a Website Tour Chevron down icon Chevron up icon
4. Creating a Tabbed News Reader Chevron down icon Chevron up icon
5. Implementing CAPTCHA using Draggable and Droppable Chevron down icon Chevron up icon
6. Creating an Event Timeline Using a Slider Chevron down icon Chevron up icon
7. Using jQuery UI with Google Maps API Chevron down icon Chevron up icon
8. Creating a Photo Album Manager Chevron down icon Chevron up icon
9. Creating Widgets Using the Widget Factory Chevron down icon Chevron up icon
10. Building a Color Picker with Hex RGB Conversion Chevron down icon Chevron up icon
11. Creating a Fully Functional Dashboard Chevron down icon Chevron up icon
A. Best Practices for Developing with jQuery UI Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon
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