This library provides a clean wrapper around all the methods exposed by a Polkadot/Subtrate network client and defines all the types exposed by a node.
Questions tagged [polkadot-js]
88 questions
0
votes
2 answers
How to get unique smart contract errors in a frontend app using polkadot.js
I am implementing a smart contract with ink!
I have defined my own errors in the smart contract like the example below.
I don't know how to get the error information in my frontend app using polkadot.js when this error occurs.
Can anyone tell me…
s.Takahashi
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- 15
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0 answers
How to get event args values from contracts::contractemitted data?
I am using
const decodedEvent = Abi.decodeEvent(Uint8Array.from(Buffer.from("00000064a7b3b6e00d000000000000000000000000000000000000000000000000", 'hex')))
(00000064a7b3b6e00d000000000000000000000000000000000000000000000000 is the data in the…
Ayudh
- 1,673
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1 answer
Why does nodejs wait a long time before exiting
i try to write a Creation Operator to got a observable from a wsprovider on polkadot.js.
and try to got polkadot event.
this is the code
import {from, fromEvent, of,Observable} from 'rxjs';
import {tap,mergeMap} from "rxjs/operators"
import {…
kula
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- 1
- 3
0
votes
2 answers
Uncaught (in promise) Error: Objects are not valid as a React chid. If you meant to render a collection of children, use an array instead
Im trying to render the output of the polkadot browser extension but i'm getting this error Uncaught (in promise) Error: Objects are not valid as a React child (found: object with keys {address, meta, type}). If you meant to render a collection of…
nvx
- 1
0
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0 answers
Correlate events with extrinsics in a utility.batch call in Polkadot
In Polkadot and Kusama blockchains emitted module events has the phase property so we can correlate them with the extrinsic that triggered that event but I can't do the same when the extrinsic is included in a utility.batch…
Mario Pino Uceda
- 61
- 6
0
votes
1 answer
Cannot create polkadot keyring with react native
I created a new react native project with this command:
npx react-native init AwesomeProject
installed package @polkadot/keyring, and created a default keyring:
const keyring = new Keyring();
After launching the project I get an error:
TypeError:…
Andrii Kapinos
- 125
- 9
0
votes
2 answers
Can I send transactions async using polkadot-js
I have walked through the official document and found a page about how to transfer using polkadot-js https://polkadot.js.org/docs/api/examples/promise/make-transfer
const transfer = api.tx.balances.transfer(BOB, 12345);
const hash = await…
Joey
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- 3
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1 answer
How do you create an account using PolkadotJS?
The hosted PolkadotJS app allows connected Substrate nodes to use 'Add account' to create a new account on the blockchain.
Using the PolkadotJS NPM package, how can I implement the 'Add account' feature?
lovelikelando
- 7,593
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0
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2 answers
Retrieving password from Polkadot js extention
hey as the title hints to, yes i have managed to loose the mnemonic phrase for my polkadot js wallet in the event of staking and creating the account. In addition i have forgot the password to the wallet itself. Now my question is if it is possible…
kib
- 77
- 5
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votes
1 answer
How to list all the parachains in a Polkadot network?
Is it possible to list all the parachains in a given network? The documentation for test-network for parachains states that we can select the desired parachain from the dropdown. I want to do the same thing from the backend using Rust but I am not…
Aviral Srivastava
- 4,058
- 8
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- 81
0
votes
1 answer
polkadot-js balances.transfer throws error
In my webapp balances.transfer is throwing an error but staking.bondExtra is working as expected. Its connected to westend network.
Error:
Error: createType(Call):: Call: failed decoding balances.transfer:: Struct: failed on args:…
Suryansh Singh
- 67
- 5
0
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0 answers
Got this runtime error while implementing assets pallet in substrate(1002: Verification Error: Runtime error: Execution failed:
Got this runtime error while implementing assets pallet
1002: Verification Error: Runtime error: Execution failed: ApiError(FailedToConvertParameter
More info about error:
1002: Verification Error: Runtime error: Execution failed:…
Makam Aravind
- 43
- 6
0
votes
1 answer
UTXO Workshop: how to get Alice's sigscript?
This might be a stupid question...
I was playing around the utxo-workshop, and there's a comment below asking on how to get alice's sigscript.
I tried following the procedure in the test cases found in utxo.rs:
let alice_signature =…
Jitterbug
- 302
- 1
- 11
0
votes
1 answer
Polkadot: Weird Transaction Hash using JS API with Westend chain
I’m using the Polkadot JS API to send transactions on Westend.
For that, the snippet is something like this:
const hash = await api.tx.balances
.transfer(to, amount)
.signAndSend(from, { tip, nonce: -1 })
.catch(e => {
…
Daniel Portugal
- 161
- 4
0
votes
1 answer
Loading @polkadot packages in react native app with expo
I am currently working on a react application to complement a web application, and have been tasked with implementing an self-sovereign identity solution using the Kilt.io protocol. This worked fine for the web app, however I am running some issues…
elillesaeter
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