ERC721B

Extended ERC721 with enumeration, minting, and pausable functionality

ERC721B

Extended ERC721 token implementation with enumeration support, public minting, and pausable functionality.

Inherits: ERC721Enumerable, Ownable

State Variables

_baseTokenURI

string _baseTokenURI

Base URI for computing tokenURI. The resulting URI for each token is the concatenation of baseURI and tokenId.

_price

uint256 public _price = 0.001 ether

Mint price per token.

_paused

bool public _paused

Pause state for minting.

maxTokenIds

uint256 public maxTokenIds = 1111

Maximum supply of tokens.

tokenIds

uint256 public tokenIds

Current token ID counter.

Functions

constructor

constructor(string memory baseURI) ERC721("LUX", "LUX") Ownable(msg.sender)

Initializes the NFT collection with a base URI.

mint

function mint() public payable onlyWhenNotPaused

Mints 1 NFT per transaction. Requires payment of _price.

addDrop

function addDrop() public onlyOwner

Adds additional tokens to the max supply.

setPaused

function setPaused(bool val) public onlyOwner

Sets the pause state for minting.

withdraw

function withdraw() public onlyOwner

Withdraws all ETH from the contract to the owner.

tokenURI

function tokenURI(uint256 tokenId) public view virtual override returns (string memory)

Returns the token metadata URI.

Modifiers

onlyWhenNotPaused

modifier onlyWhenNotPaused()

Ensures minting is not paused.

Usage

import "@luxfi/standard/src/tokens/ERC721B.sol";

// Deploy
ERC721B nft = new ERC721B("https://api.example.com/metadata/");

// Mint
nft.mint{value: 0.001 ether}();

// Check ownership
address owner = nft.ownerOf(tokenId);

// Get total supply
uint256 total = nft.totalSupply();

// Get tokens by owner
uint256[] memory tokens = new uint256[](nft.balanceOf(owner));
for (uint i = 0; i < nft.balanceOf(owner); i++) {
    tokens[i] = nft.tokenOfOwnerByIndex(owner, i);
}

Features

Enumeration

Full enumeration support via ERC721Enumerable:

totalSupply() - Total minted tokens
tokenByIndex(index) - Token ID at global index
tokenOfOwnerByIndex(owner, index) - Token ID at owner's index

Pausable Minting

Owner can pause/unpause minting:

// Pause minting
nft.setPaused(true);

// Resume minting
nft.setPaused(false);

Expandable Supply

Owner can add drops to increase max supply:

nft.addDrop(); // Adds to maxTokenIds

ERC721B

On this page