How to estimate gas Price using Ethers.js prior to sending the transaction?

Question

I am trying to estimate gas using ethers. I have tried using await this.signer.getGasPrice() but this doesn't take into account my contract's function and my address.I saw that on ethers's documentation they have a function

await provider.estimateGas({ // Wrapped ETH address

to: "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2", // `function deposit() payable`

data: "0xd0e30db0", // 1 ether

value: parseEther("1.0") });

but this takes transaction data as an input?

How am I supposed to get tranaction data prior to submitting a transaction?

Answer 1

I am not sure i get it right but if you want to estimateGas you send

1. contract address
2. methodId of required function
3. any amount to test and data is "0x" + first 4 bytes of keccak hash of the ASCII form of the signature, it is included in Abi of contract. i usually find it with etherscan in InputData part of transaction details for desired function