dissociate-token-via-ethers

Dissociate Token via Ethers

Dissociate an account with the provided HTS token via ethers.js.

You are able to treat HTS tokens as if they were ERC20/ERC721 tokens. This allows us to call the dissociate function directly on the HTS token.

Dissociating an account with a Hedera Native token is unique to Hedera. Once dissociating is successful, no token related operation can be performed to that account.

Note The account is required to have a zero balance of the token you wish to dissociate. If a token balance is present, you will receive a TRANSACTION_REQUIRES_ZERO_TOKEN_BALANCES error.

Code

The file index.js provides the code necessary to switch to the Hedera Testnet Network and dissociate an account with a Hedera native token via ethers.js and MetaMask.

Use switchToHederaNetwork() to change to the Hedera Testnet network to complete the association call.

• Use wallet_switchEthereumChain to switch to the Hedera Testnet network.
• Use wallet_addEthereumChainto add the Hedera Testnet network to MetaMask in the event it has not been previously added.
  • Use chainId 0x128 in hexadecimal numbers to add the Hedera Testnet Network
  • Use nativeCurrency to describe the native currency of the chain
    • Use name HBAR
    • Use symbol HBAR
    • Use decimals 18 a non-negative integar
  • Use rpcUrls an array of RPC URLS for the custom network. Use https://testnet.hashio.io/api or for alternatives visit How to Connect to Hedera Networks Over RPC

Use dissociateToken() to dissociate an account with the provided HTS token solidity address

• Use ['function dissociate()'] as a hardcoded ABI that exposes (a subset of the) known interface of all HTS tokens.
• Use ethers.Contract to initialise an instance using the address and ABI.
• Use gasLimit to override ethers default gas limit to be 800_000.
• Invoke dissociate on the token instance, which you can interact with a "standard" EVM smart contract from this point onward.

Note Run the page within a local web server. If using Visual Studio Code you can install the Live Server extension and open the HTMl file with Live Server.

References

• HIP-719: Associate and Dissociate Tokens via Facade Contract
• How to Connect to Hedera Networks Over RPC