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example_app.html
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example_app.html
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<!DOCTYPE html>
<link rel="stylesheet" href="boilerplate/style.css" />
<style>
label, button {
margin: 10px;
}
</style>
<title>NFT <-> Owner</title>
<h1 style="text-align: center;">NFT Owner Finder</h1>
<p>
Please enter the address of a smart contract that implements the ERC271 specification.
</p>
<div>
<label>
Smart Contract Address
<input id="smartContractAddressInput" value="0x25ed58c027921E14D86380eA2646E3a1B5C55A8b"/>
</label>
<div style="display: flex;">
<label>
Target Token ID
<input id="tokenIdInput" type="number" value="5666" />
</label>
<button id="findOwnerButton">Find Token Owner</button>
</div>
<hr />
<label>
Owner Address
<input id="ownerAddressInput" disabled />
</label>
<label>
Owner ENS Domain
<input id="ownerDomainInput" disabled />
</label>
<label>
Token Metadata
<textarea id="tokenMetadataInput" disabled style="height: 400px"></textarea>
</label>
<label>
Token Image
<img src="" id="tokenImage"/>
</label>
<script type="module">
import { ethers } from "//unpkg.com/ethers@5.5.1/dist/ethers.esm.min.js"
const smartContractAddressInput = document.getElementById("smartContractAddressInput")
const tokenIdInput = document.getElementById("tokenIdInput")
const ownerAddressInput = document.getElementById("ownerAddressInput")
const ownerDomainInput = document.getElementById("ownerDomainInput")
const findOwnerButton = document.getElementById("findOwnerButton")
const tokenMetadataInput = document.getElementById("tokenMetadataInput")
const tokenImage = document.getElementById("tokenImage")
const erc721ReadOnlyAbi = [
"function ownerOf(uint256 _tokenId) external view returns (address)",
"function tokenURI(uint256 _tokenId) external view returns (string)"
]
const provider = ethers.getDefaultProvider()
findOwnerButton.addEventListener("click", async () => {
const contractAddress = smartContractAddressInput.value
const smartContract = new ethers.Contract(contractAddress, erc721ReadOnlyAbi, provider)
ownerAddressInput.value = "Loading..."
ownerDomainInput.value = "Loading..."
tokenMetadataInput.value = "Loading..."
tokenImage.src = ""
try {
const metadataUri = await smartContract.tokenURI(tokenIdInput.value)
const metadata = await fetch(metadataUri).then(r => r.text()).then(t => JSON.parse(t))
tokenImage.src = metadata.image
tokenMetadataInput.value = JSON.stringify(metadata, null, 2)
} catch(e) {
tokenMetadataInput.value = "Can't load token data."
}
try {
ownerAddressInput.value = await smartContract.ownerOf(tokenIdInput.value)
} catch(e) {
ownerAddressInput.value = "No owner found."
}
ownerDomainInput.value = (await provider.lookupAddress(ownerAddressInput.value)) ?? "No domain assigned to owner's address."
})
</script>