Скачать или смотреть How to Check if a Block is Movable and Swap it with the Empty Block in Javascript Sliding Puzzle

Discover how to determine if a block in a sliding puzzle is movable and swap it with the empty block. Follow this comprehensive guide with practical examples in Javascript for better understanding.
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This video is based on the question https://stackoverflow.com/q/74269266/ asked by the user 'Rawley' ( https://stackoverflow.com/u/15073217/ ) and on the answer https://stackoverflow.com/a/74269603/ provided by the user 'trincot' ( https://stackoverflow.com/u/5459839/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Check if a Block is Movable and Swap it with the Empty Block in Javascript Sliding Puzzle

Have you ever wanted to build a sliding tile puzzle using Javascript but got stuck trying to figure out how to check if a block can be moved? It can be quite challenging, especially if you’re new to manipulations involving HTML elements.

In this guide, we will break down the problem of identifying whether a block in a sliding puzzle can swap places with an empty block when clicked. I'll provide a detailed step-by-step solution to help you understand the logic behind it.

Understanding the Puzzle

In a typical sliding tile puzzle:

You will have a grid of blocks with one block space left empty.

The goal is to click on a block adjacent to the empty space to swap them.

Not all blocks will be movable; only the ones adjacent (horizontally or vertically) to the empty space can be clicked on for a swap.

Key Considerations

Before diving into the coding part, here are two important considerations:

Do not create a block for the empty space.
Instead, track the empty space separately in your state management.

Maintain the game's state.
Keeping an updated reference for each block's position helps manage the puzzle's state effectively.

Step-by-Step Implementation

Here's how to set up the sliding puzzle:

1. Set Up the HTML Structure

Create a container element in which the blocks will reside:

[[See Video to Reveal this Text or Code Snippet]]

2. CSS for Styling

You will need some basic styling for the container and the blocks:

[[See Video to Reveal this Text or Code Snippet]]

3. Initialize the Game State in Javascript

The following code initializes the blocks and sets up the event listener for clicks:

[[See Video to Reveal this Text or Code Snippet]]

4. Adding Click Event Listener

You’ll listen for click events on the blocks to allow for movement:

[[See Video to Reveal this Text or Code Snippet]]

5. Conclusion

By implementing this logic, you can effectively manage the sliding puzzle interactions in Javascript. The critical points to remember are to keep track of the empty space and ensure only adjacent blocks are movable.

Feel free to modify and expand upon this example as you become more comfortable with your Javascript skills. Happy coding, and enjoy creating your sliding puzzle game!