dappuniversity/eth_swap

Instant Cryptocurrency Exchange Tutorial

eth_swap's Issues

app.js loadBlockchain() function issue

await token.methods.balanceOf(this.state.account).call()
this is returning null value.
please update it.

Error: invalid address

Hi Everyone
Would you be able to help me find why i am getting this error below when i try to swap Dapp to Eth?
I Finish the 3 hours course from the link below and I managed to swap Eth to Dapp however cannot do the opposite
https://www.dappuniversity.com/articles/learn-blockchain#dependencies

Thank you

Error: invalid address (argument="address", value=undefined, code=INVALID_ARGUMENT, version=address/5.1.0) (argument="_spender", value=undefined, code=INVALID_ARGUMENT, version=abi/5.0.7)

Logger.makeError
C:/Program Files/Git/eth_swap/node_modules/@ethersproject/logger/lib.esm/index.js:219
Logger.throwError
C:/Program Files/Git/eth_swap/node_modules/@ethersproject/logger/lib.esm/index.js:230
Logger.throwArgumentError
C:/Program Files/Git/eth_swap/node_modules/@ethersproject/logger/lib.esm/index.js:235
AddressCoder._throwError
C:/Program Files/Git/eth_swap/node_modules/web3/node_modules/@ethersproject/abi/lib.esm/coders/abstract-coder.js:54
AddressCoder.encode
C:/Program Files/Git/eth_swap/node_modules/web3/node_modules/@ethersproject/abi/lib.esm/coders/address.js:28
(anonymous function)
C:/Program Files/Git/eth_swap/node_modules/web3/node_modules/@ethersproject/abi/lib.esm/coders/array.js:67
pack
C:/Program Files/Git/eth_swap/node_modules/web3/node_modules/@ethersproject/abi/lib.esm/coders/array.js:53
TupleCoder.encode
C:/Program Files/Git/eth_swap/node_modules/web3/node_modules/@ethersproject/abi/lib.esm/coders/tuple.js:38
AbiCoder.encode
C:/Program Files/Git/eth_swap/node_modules/web3/node_modules/@ethersproject/abi/lib.esm/abi-coder.js:131
ABICoder.push../node_modules/web3/node_modules/web3-eth-abi/lib/index.js.ABICoder.encodeParameters
C:/Program Files/Git/eth_swap/node_modules/web3/node_modules/web3-eth-abi/lib/index.js:145
(anonymous function)
C:/Program Files/Git/eth_swap/node_modules/web3/node_modules/web3-eth-contract/lib/index.js:498
_encodeMethodABI
C:/Program Files/Git/eth_swap/node_modules/web3/node_modules/web3-eth-contract/lib/index.js:497
_processExecuteArguments
C:/Program Files/Git/eth_swap/node_modules/web3/node_modules/web3-eth-contract/lib/index.js:806
_executeMethod
C:/Program Files/Git/eth_swap/node_modules/web3/node_modules/web3-eth-contract/lib/index.js:825
App._this.sellTokens
C:/Program Files/Git/eth_swap/src/components/App.js:71
onSubmit
C:/Program Files/Git/eth_swap/src/components/SellForm.js:20
HTMLUnknownElement.callCallback
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:147
invokeGuardedCallbackDev
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:196
invokeGuardedCallback
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:250
invokeGuardedCallbackAndCatchFirstError
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:265
executeDispatch
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:571
executeDispatchesInOrder
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:596
executeDispatchesAndRelease
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:695
executeDispatchesAndReleaseTopLevel
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:704
forEachAccumulated
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:676
runEventsInBatch
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:844
runExtractedEventsInBatch
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:852
handleTopLevel
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:5030
batchedUpdates$1
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:21425
batchedUpdates
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:2247
dispatchEvent
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:5110
(anonymous function)
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:21482
unstable_runWithPriority
C:/Program Files/Git/eth_swap/node_modules/scheduler/cjs/scheduler.development.js:255
interactiveUpdates$1
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:21481
interactiveUpdates
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:2268
dispatchInteractiveEvent
C:/Program Files/Git/eth_swap/node_modules/react-dom/cjs/react-dom.development.js:5086
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Error: invalid address (argument="address", value=undefined, code=INVALID_ARGUMENT, version=address/5.3.0) (argument="_spender", value=undefined, code=INVALID_ARGUMENT, version=abi/5.0.7)

eth_swap/src/components/App.js

Line 71 in eb4a135

this.state.token.methods.approve(this.state.ethSwap.address, tokenAmount).send({ from: this.state.account }).on('transactionHash', (hash) => {

eth_swap/src/components/SellForm.js

Line 20 in eb4a135

this.props.sellTokens(etherAmount)

× Unhandled Rejection (TypeError): Cannot read property 'toString' of null

`
const networkId = await web3.eth.net.getId()

const tokenData = Token.networks[networkId]
if(tokenData) {
  const token = new web3.eth.Contract(Token.abi, tokenData.address)
  this.setState({ token })
  let tokenBalance = await token.methods.balanceOf(this.state.account).call()
  this.setState({ tokenBalance: tokenBalance.toString() })
} else {
  window.alert('Token contract not deployed to detected network.')
}`

Can I use this to accept USDT in stead of ETH?

Subject kinda says it all :)

But what need to be changed inorder for me to accept USDT instead of ETH?

Unhandled Rejection (TypeError): token.methods.balanceOf is not a function

const networkId =  await web3.eth.net.getId()
const tokenData = Token.networks[networkId]
if(tokenData) {
  const token = new web3.eth.Contract(Token.abi, tokenData.address)
  this.setState({ token })
  let tokenBalance = await token.methods.balanceOf(this.state.account).call()
  this.setState({ tokenBalance: tokenBalance.toString() })
} else {
  window.alert('Token contract not deployed to detected network.')
}