Questions tagged [polkadot-js]
Questions about the Polakdot JS API used to interact with Substrate based chains via JavaScript.
79
questions with no upvoted or accepted answers
6
votes
0
answers
33
views
How to connect to Polkadot Relay-Chain through the code of moonbeam parachain?
I want to connect polkadot relay chain but i'm not able to select keys for the customSpec generated by the binary of Moonbeam-Parachain. The customSpec is this->
{
"name": &...
- 584
5
votes
0
answers
105
views
How to use the default Substrate CLI rpc-cors values without using rpc-cors=all for a Collator node and connect from Polkadot.js Apps
I want to be able to connect a collator node using https://polkadot.js.org/apps that is based on the substrate-parachain-template using branch 'polkadot-v0.9.18' and is being run as a parachain in ...
- 1,856
4
votes
0
answers
110
views
FATAL: Unable to initialize the API: createType(BlockHash):: Expected input with 32 bytes (256 bits), found 64 bytes
I was running parity-bridges-common but the second node explorer is showing this error. Please guide me through this.
- 1,464
4
votes
0
answers
134
views
api.call.transactionPaymentApi.queryInfo returns partial fee 0
With the update to the Polkadot-JS api depreciating rpc.payment.queryInfo in favor for api.call.transactionPaymentApi.queryInfo I am currently trying to migrate my code over. However I used to get the ...
- 89
3
votes
1
answer
17
views
Expose a custom `pub fn` from my pallet to frontend via polkadot.js API
I have a pallet that does some light calculation on one or more storage items (GasReserve and IdleFunds below) or wraps some internal functionality. E.g.
impl<T: Config> Pallet<T> {
...
- 109
3
votes
1
answer
30
views
How do I get the currently logged address in front end template?
What I´m trying to do is to condition some option/modal to be shown in on the screen depending on the logged user/account being the owner or not so to have something similar to:
accountPair.address ===...
- 122
3
votes
0
answers
80
views
In-browser signing of payload generated with subxt
I am generating a partial unsigned extrinsic via subxt however cannot figure how to how to sign it using the polkadot.js api. For example:
#[subxt::subxt(runtime_metadata_path = "...
- 51
3
votes
0
answers
35
views
Where to add the Custom RPC types in polkadot-js/apps directory?
In the Custom RPC types docs it explains how to create the types within the API promise, but it doesn't explain where to add it within the polkadot-js/apps repo, which is understandable because the ...
- 1,176
3
votes
0
answers
20
views
Does callback get called when extrinsic is in block/finalized when the transaction is retracted?
In some cases the transaction I am signing and sending gets retracted, but its my impression that they are usually included in a future block.
When using polkadot js with the promise api, if the ...
- 41
3
votes
0
answers
56
views
Polkadot-JS API not reflecting changes on explorer or chain in local development
So i created a simple frame pallet with an extrinsic. I called this extrinsic from the local explorer at 127.0.0.1:9944 and everything worked and events were generated. But calling it from the ...
- 101
3
votes
0
answers
83
views
Custom typegen and using ApiPromise: Property 'unwrap' does not exist on type 'Codec'
It seems there is a mismatch between autocomplete suggestion return types from an ApiPromise instance and the actual returned type.
I am using "@polkadot/api": "8.1.1". I am ...
- 73
2
votes
1
answer
45
views
How to troubleshoot synchronisation issues between two nodes in a local Substrate blockchain network using server?
I am trying to set up a local blockchain network using the Substrate framework and two separate servers running on Alice (port 9944) and Bob (port 9944). However, I am encountering an issue where the ...
- 61
2
votes
0
answers
25
views
How to create a preimage which is the batch of other preimages?
I am wondering whether, and if so how, it is possible to submit a preimage which batches over other preimages, e.g.
const pre1= '0x09401eb25e90bf587fbde8d2a9be8af5ac0f3187f02f4e9e9f1f178b0314ebe5';
...
2
votes
1
answer
24
views
How to fix "module group is private" error when using frame-support-procedural-tools v3.0.0?
I'm trying to use orml-tokens in my Substrate project and encountered the following error:
error[E0603]: module `group` is private
--> /home/kianoush/.cargo/registry/src/github.com-...
- 491
2
votes
1
answer
29
views
Is there any way to get the validators signatures of the finalized blocks in substrate based chains?
I need the signatures of the validators who have signed on the produced and finalized blocks.
For example, In cosmos-SDK based blockchains blocks contains the signatures(and validators addresses) of ...
2
votes
0
answers
55
views
Fuzzing Polkadot produces Invalid Signature after chaos is injected
I'm using Polkadot version 0.9.37-08b1c09ca46, across 4 Nodes - Alice, Bob, Charlie, Dave, in a local testnet environment. I have a period of network chaos applied, and then moments of stabilized '...
- 21
2
votes
1
answer
2k
views
Usage Error: Couldn't find the node_modules state file - running an install might help (findPackageLocation)
Prior to cloning the substrate-front-end-template repo with tag "monthly-2022-02" I installed the following since I was building it from a Dockerfile using pre-built Docker image node:...
- 1,856
2
votes
0
answers
43
views
How to call a function from custom pallet using api.tx?
I made a custom pallet and wants to access its method using a extrinsic call like api.tx.<module>.<method> but was not able to do that, do i need to implement it in blockchain code or it ...
- 1,485
1
vote
1
answer
28
views
How can I sign and execute transactions using custom origin(20 bytes address) in PolkadotJS
I have a pallet which ensures a particular custom origin of H160(20 bytes). Actually, this pallet is to ensure that the Origin is that of an ethereum address(20 bytes).
I am therefore writing ...
- 359
1
vote
1
answer
22
views
Why doesn't getMetadata show my callable methods as extrinsics in Substrate-node-template
When running Substrate-node-template - basically the Kitties - and with a callable eg create_kitty() as a dispatchableResult in the call pallet, what I assume to be an extrinsic in the metadata, this ...
1
vote
0
answers
46
views
How can I decode this error message {"ok":{"flags":["Revert"],"data":"0x000110"}}?
I'm using polkadotjs to call my ink! smart contracts and I seem to be having trouble with calls that require parameters. For the call below I am getting the revert flag {"ok":{"flags&...
1
vote
0
answers
30
views
How to calculate claimable rewards from dApp Staking on Astar and Shibuya across multiple eras and multiple dApps?
Hi~ I have some questions about the developer staking process.
I am using polkadot-api, developer staking part on shibuya-network.
At portal.astar.network, I can see staking info on the dApp Staking ...
- 33
1
vote
0
answers
19
views
What's the process to auto-generate `typesBundle.ts` in polkadot-js/apps?
Attempting to test some RPCs in development for a new pallet in Frequency, and trying to get them to show up in the Polkadot-JS UI running locally. I finally hit upon manually adding them to apps-...
- 46
1
vote
1
answer
46
views
How can I represent a polkadotjs type for a custom generic Enum?
I'm uncertain how I can structure the generic variant of a polkadotjs type for an on-chain Enum that looks sort of like this:
#[derive(TypeInfo, Debug, Clone, Encode, Decode, PartialEq)]
pub enum ...
- 430
1
vote
1
answer
55
views
How to get the payload from a polkadot-js transaction
I'm wondering what are the possible ways to extract the payload from a polkadot-js transaction.
So far the only way seems to be to define a custom signer that implements the Signer interface and then ...
- 71
1
vote
0
answers
32
views
PolkadotJS system and storage events are not being decoded and shown properly
I found a perhaps similar question here : Polkadot Explorer: decode storage system.events
We are running a custom parachain with frontier on a local testnet and while the transactions go through fine,...
- 197
1
vote
1
answer
26
views
Is there a .into_sub_account_truncating equivalent for Javascript?
In rust I use:
.into_sub_account_truncating()
Is there a Javascript equivalent?
- 1,176
1
vote
2
answers
112
views
Update Runtime sudo transaction exhausted (Substrate)
I am trying to reimplement one of the Substrate tutorials:
https://docs.substrate.io/tutorials/get-started/upgrade-a-running-network/
But I am stuck with an issue - where it says to do Scheduler -> ...
- 31
1
vote
0
answers
21
views
How to show dropdown in PolkadotJS after selecting an item for extrinsic?
First of all I apologise in advance for asking this weird question. I am not sure if this is the right forum.
I have a scenario, where I have a data structure and storage like this:
#[derive(PartialEq,...
- 303
1
vote
0
answers
27
views
Subscribe via json-rpc has no response
I don't get any response from json-rpc subscription.
It seems I need a type paramater, but the provider.subscribe() method does not document the type parameter. (I checked the js, java and python code,...
- 195
1
vote
0
answers
51
views
Use state call to query from custom Runtime Api, Balance in frontend is not equal to Balance in Runtime
Background
Our front end use state call to query custom RuntimeApi of our solo chain.
We try to use state call to replace custom rpcs.
Definition
Balance is our chain is u128.
RuntimeApi Definition
...
1
vote
1
answer
27
views
How can I tell which validator is being bonded to for a given bonding extrinsic?
I would like to extract the validator that a given nominator is bonding? Is this possible given the extrinsic or should it be done some other way?
Here is my code:
const { ApiPromise, WsProvider } = ...
- 37
1
vote
0
answers
22
views
How did kusama and Polkadot integrated their respective ledger nano app via Polkadot ui?
Polkadot and kusama respectively have integrated their platform with ledger hardware wallet. After reading documentation I came to know that integrating a blockchain with ledger requires a nano app ...
1
vote
0
answers
2k
views
error TS2742: The inferred type of X cannot be named without a reference to
I am building simple SDK for Polkadot Api calls. I am running into following issue trying to build it:
error TS2742: The inferred type of 'closeChannel' cannot be named without a reference to '.pnpm/@...
- 11
1
vote
1
answer
55
views
Subscribe to all storage
Reading through this: https://polkadot.js.org/docs/api/start/api.query.multi/
It states "It should be trivially extendable to subscribe to the validators, track which one have entered or left&...
- 11
1
vote
1
answer
39
views
How to get event args values from contracts::contractemitted data?
I am using
const decodedEvent = Abi.decodeEvent(Uint8Array.from(Buffer.from("00000064a7b3b6e00d000000000000000000000000000000000000000000000000", 'hex')))
(...
- 111
1
vote
0
answers
70
views
Why is it that the signature created using polkadot api is valid, but verifying that signature using substrate library is invalid?
The js code uses polkadot api, util-crypto and extension-dap
const { signature } = await signRaw({
address: account.address,
data: payload,
type: 'bytes'
});
// ...
- 111
1
vote
0
answers
47
views
Get reward amount in polkadot.js/api
I want to get reward for specific address in polkadot.js/api.
Especially for kusama.
Is polkadot.js providing such api to get reward for specific validator address?
also for specific block height?
- 173
1
vote
0
answers
31
views
Can not transfer balance in polkadot.js.org?
I start running development node, and try to test about transfer balance in polkadot.js.org
Problem: Make Transfer button only hidden, not show
- 496
1
vote
1
answer
523
views
API-WS: disconnected from ws://127.0.0.1:9946: 1006:: Abnormal Closure
I'm trying to connect local node running on my pc using polkadot.js library in react.js(browser). I'm pasting my code in below snippet and error that I'm facing in chrome console
Code
// **************...
1
vote
0
answers
41
views
ChainBridge: how to show transferred amount from ERC20 to Substrate parachain?
after following the tutorial[https://chainbridge.chainsafe.io/local/] of running Chainbridge locally,
I can send 1 Substrate Native Token to ERC20
But when I sent 1, 100, 1000000, even ...
- 1,033
1
vote
0
answers
47
views
Error making .multi subscription call (Kitties Tutorial)
The error I see in the browser console is:
VEC: Unable to decode on index 0 createType(Lookup9):: Expected at least 32 bytes (256 bits), found 16 bytes
Offending code snippet (from Kitties.js):
// ...
- 11
1
vote
0
answers
38
views
Read Token Contract Information
I would like to read contract information(especially name, symbol, decimal, owner) from token contracts like shown here: https://moonbeam.moonscan.io/token/0x818ec0a7fe18ff94269904fced6ae3dae6d6dc0b#...
- 61
1
vote
0
answers
18
views
Why after passing more than 24 hours some tips close button on Polkadot js are still grey/disabled?
After a treasury tip receives "half + 1" tips from the councils, It goes to the countdown period. I run api.consts.tips.tipCountdown on Polkadot an get 14,400, which should be in blocks! If ...
- 447
0
votes
0
answers
3
views
Listen to balance changes wrong after transfer token
I'm facing an issue. I used a query subscription to listen and update the free balance on UI. But I don't know why, when I log free in callback, they always return a balance of receiver and then a ...
- 11
0
votes
1
answer
22
views
Frontier template using sr25519 - polkajsapi
I just cloned frontier and modified the code for using H256 address following this
These are my changes in runtime/src/lib.rs:
pub type Signature = MultiSignature;
impl pallet_evm::Config for Runtime ...
0
votes
0
answers
16
views
How to log events on frontend dapp from emit_event of smart contract?
I'm currently struggling on obtaining logs of the events emitted from my smart contract on the frontend dapp. The smart contract code itself should work just fine as it emits the event perfectly fine ...
- 1
0
votes
0
answers
16
views
Where in PJS Apps are signatures added to transactions & submitted?
I have been following the path of a Ledger submitted transaction on Polkadot JS Apps, and have found that the Ledger device is generating a signature here in hw-ledger/src/bundle.ts.
I am unable ...
- 121
0
votes
1
answer
22
views
How to get history of the native coin total issuance through API - Say DOT
How can one download the history of a native coin total issuance, via an API - Say DOT?
0
votes
0
answers
26
views
Using the --rpc-cors flag with anything besides 'all' gives rejected connection
I'm trying to use the --rpc-cors flag in a remote VM, behind a ssl enabled nginx proxy. When connecting using the Polkadot UI passing 'all' as parameter, it connects without problem in wss://...
