How to Build a Tetris Game in HTML: A Step-by-Step Guide

This guide will walk you through the process of creating a Tetris game in HTML. You'll learn how to set up the game board, handle user input, and implement the core game mechanics.

Getting Started

Create an HTML file: Start by creating a new HTML file and name it 'tetris.html'.

Include libraries: In the <head> section of your HTML file, add links to the jQuery library and your Tetris JavaScript file.

<script src='https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js'></script>
<script src='tetris.js'></script>

Create the canvas: Inside the <body> tag, create a <canvas> element with an ID of 'canvas':
```
<canvas id='canvas'></canvas>
```
Set canvas dimensions: Use the width and height attributes to define the size of the canvas.
```
<canvas id='canvas' width='300' height='600'></canvas>
```

JavaScript Implementation (tetris.js)

Define variables: In your 'tetris.js' file, declare variables for the game board, shapes, current shape, and other game elements.
Draw the game board: Create a function to draw the game board and the current shape on the canvas using the canvas API.
Handle movement: Implement functions to move the current shape down, left, or right based on user input (keyboard keys).
Rotation: Create a function to rotate the current shape according to user input.
Collision detection: Write a function to check for collisions between the current shape and the game board.
Adding shapes to the board: Implement a function to add the current shape to the game board when it reaches the bottom or collides with a block.
Row clearing: Create a function to check for complete rows and remove them, updating the score accordingly.
Score and level: Implement functions to calculate and display the player's score and level based on the number of rows cleared.
Event listeners: Use event listeners to capture user input (keyboard events) for movement, rotation, and dropping the shape.
Game loop: Create a loop that continuously calls the drawing function, the movement function, and updates the game state.

Conclusion

By following these steps, you can build your own Tetris game in HTML and JavaScript. Don't hesitate to experiment with different designs and features to create a unique and enjoyable game! Happy coding!

How to Build a Tetris Game in HTML: A Step-by-Step Guide