Questions tagged [javascript]
Questions about JavaScript in the context of Substrate and Polkadot.
40 questions
0
votes
2
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34
views
Get crowdloan contributors at specific block
I'm using polkadot-js to get all the contributors for a crowdloan:
const contributors = await api.derive.crowdloan.contributions(paraId);
However, I need to get them at a specific block. I have seen ...
- 394
0
votes
0
answers
28
views
generate types from chain does not work. Documentation is not clear
I dont think typegen is working as expected per documentation, by following the provided example and adapting it to my parachain.
`
Found 244 errors in 5 files.
Errors Files
5 src/interfaces/augment-...
- 45
0
votes
1
answer
58
views
polkadot query api and None parameter
Some API queries accept optional parameters Option that can be omitted.
How are those queries written with the javascript API?
For example:
api.query.preimage.preimageFor() takes an Option<(H256,...
- 45
1
vote
1
answer
67
views
How to pass value as a argument in send transactions?
An error occurred: 'Expected 2 arguments for the contract message 'vote', but only 1 was provided.First argument was number type, and the second one was Enum . This error arises when attempting to ...
1
vote
2
answers
116
views
Reading contract value returns null
Facing an issue while trying to query for a value in my contract. The value keeps getting retuned as null with an error. However, it works fine on substrate Contracts UI
Front end Dapp :
const ...
- 119
3
votes
1
answer
21
views
Property X does not exist on type DecoratedRpc
We are currently experiencing an issue related to RPC methods. Let me provide a description of the problem:
To generate metadata from our node, we use the following command:
echo '{"id":1,&...
- 401
1
vote
1
answer
115
views
How to Implement P2P Encryption with sr25519 key pair using NaCl or alternatives?
I am currently working on a project that involves P2P encryption using Substrate addresses and sr25519 cryptographic keys. However, I am encountering difficulties in implementing encryption and ...
- 21
3
votes
1
answer
94
views
How to automatically pass the value to custom SignedExtension
For now I have custom SignedExtension in my substrate node:
#[derive(Encode, Decode, Clone, Eq, PartialEq, TypeInfo)]
#[scale_info(skip_type_params(T))]
pub struct CheckAccount<T> {
...
0
votes
1
answer
37
views
How to query api.query.authorityDiscovery.keys?
I'm trying to call api.query.authorityDiscovery.keys as is described here from rpc.polkadot.io like:
let current_auth_keys = await api.query.authorityDiscovery.keys();
and I keep getting:
TypeError: ...
- 278
1
vote
1
answer
246
views
Invalid Transaction: Transaction has a bad signature - Ledger signature into tx
I am attempting to submit a transaction using Polkadot JS API and a signature that has been signed by Ledger. Upon passing it to send I get the Invalid Transaction: Transaction has a bad signature ...
- 191
2
votes
1
answer
192
views
How to get raw payload from Polkadot JS transaction
As the title asks, how do we abstract the raw payload of a transaction created with Polkadot JS?
// set up a tx, e.g. join a nomination pool
const tx = api.tx.nominationPools.join(bond, poolId);
// ...
- 191
1
vote
1
answer
107
views
Trying to get an AccountId32 from a string in js
i'm trying to get an accountId32 from a string. In fact , i received account address in a telegram message but i would like to use native method has of BTreeMap<AccountId32, u32>.
anyone got an ...
- 33
1
vote
2
answers
93
views
How to verify that signed transaction, is correctly signed?
I want to decode and check if the given hex data for the transaction is valid and signed correctly.
The flowing is how I currently construct the transaction and convert it to hexadecimal format.
...
- 111
1
vote
1
answer
68
views
How to use smoldot in rust application?
I can find only javascript interfaces and documentation to interact with it, but nothing regarding rust?
Feels a bit weird to use js library for rust application in rust application. Neither subxt ...
- 91
1
vote
1
answer
55
views
Substrate-Connect Error on new ScProvider
I am using Substrate Connect in the browser following the docs for a custom chain spec. When I try to create a new ScProvider like the documentation suggests i get an error that I am missing a ...
- 361
2
votes
1
answer
61
views
Is there a .into_sub_account_truncating equivalent for Javascript?
In rust I use:
.into_sub_account_truncating()
Is there a Javascript equivalent?
- 1,466
1
vote
1
answer
138
views
Question for api.call.transactionPaymentApi.queryInfo state call
I'm replacing api.rpc.payment.queryInfo with api.call.transactionPaymentApi.queryInfo in the crawler code of Polkastats block explorer but I want to ask about the second parameter len: is that the ...
2
votes
1
answer
165
views
How to retrive data stored in a block
I have stored an information on chain and I want to access that information using RPC call.
I used the following code and provided the hash created.
const signedBlock = await api.rpc.chain.getBlock(...
2
votes
1
answer
68
views
Embedding javascript (wasm) in substrate runtime
I have some javascript code that I need to embed in my substrate runtime. It's not possible / practical to rewrite the javascript code in rust. I was wondering if instead it would be possible to ...
- 107
2
votes
1
answer
192
views
How to handle XCM encoding and building in JavaScript
Talisman and I are looking into building a simple JS module that helps developers build XCM for transactions and abstract common patterns like cross chain transfers into a simple JS function taking ...
- 163
0
votes
1
answer
388
views
JavaScript/TypeScript: How to pass arguments of an array individually to a function?
I want to dynamically call contract functions. The only problem with this is,
that all of the functions have a different amount of variables.
As of now, the function looks like this:
async call(...
- 491
0
votes
1
answer
51
views
Run JavaScript Js scripts in Zombienet tests and assert on the completeness or return value
I saw this in Zombienet's Testing DSL page:
https://github.com/paritytech/zombienet/blob/main/docs/src/test-dsl-definition-spec.md
Under Available Assertions
Custom js scripts: Allow to run a defined ...
- 1,207
1
vote
1
answer
99
views
How to change input from string to Id::Bytes in JavaScript?
I am using the openbrush standard to implement a psp34 token.
Now I want to call certain methods from said token, like for
example owner_of.
owner_of from psp34 has id:Id as an input which can then be ...
- 491
0
votes
1
answer
650
views
How can you query a smart contract using the polkadot.js api?
I want to query a smart contract which I deployed on the Aleph Zero testnet.
The Polkadot.js documentation is pretty clear and easy to follow regarding connecting to the chain and querying general ...
- 491
0
votes
1
answer
167
views
Create hex encoded call (for XCM transact call) in javascript?
I'm trying to create the encoded element for an XCM V0 transact call such as:
const message = {
V0: {
Transact: {
originType: "Native",
...
- 418
2
votes
1
answer
69
views
How to use the polkadot/dev project template
I'm trying to convert my project over to a structure similar to the @polkadotjs repositories, but I'm finding the dev template provided a bit difficult to parse. Specifically:
How do I use this ...
- 561
0
votes
1
answer
62
views
How can I listen to new receive transfer?
I want to listen to new transfers and get the hash and amount.
How can I?
Also, Can I get list transfers of account like this url?
https://westend.subscan.io/account/...
- 1
2
votes
1
answer
94
views
How to create a tuple type using polkadot.js api
I am trying to create a tuple. I know we can create an enum by defining the type as
MyEnum: {
_enum: {
'account': String,
'accountId': 'u128'
...
- 155
1
vote
2
answers
70
views
How to signAndSend() without a MNEMONIC
I'm trying to allow users on the client side send an api.tx.system.remark( 'message' ); with PolkadotJS.
I run into issues on signing and sending the transaction, as I will not have their secret key. ...
- 241
0
votes
1
answer
39
views
Get remaining value of bounty after child bounty
I am writing a web app that shows current info about bounties and child bounties. From what i understand if there is a bounty with a value of 5 DOT, I can create N child bounties which values sum up ...
- 1
1
vote
2
answers
59
views
Are there any tools available for creating a mock version of a contract in JS/TS?
Currently, we use "live" versions of our contracts running on a substrate contracts node in our JavaScript tests. This makes them integration tests and difficult to include in simple GitHub ...
- 1,514
3
votes
1
answer
256
views
Dev Substrate Node at Capacity for WS Connections, how to flush?
I'm running a node in dev mode: ./substrate/target/release/substrate --dev --tmp --ws-external
My client connection code:
provider = new WsProvider(wsProvider)
api = await new ApiPromise({ provider })....
- 131
3
votes
2
answers
183
views
Access your NFTs using PolkadotJS API
Still very new to this ecosystem. I'm trying to build a ReactApp that can access my NFT's that I have purchased on the Singular App.
High level explanation, how do I do this?
Low level, point me in ...
- 241
7
votes
1
answer
114
views
How to programmatically get current unbonding information on the Polkadot relay chain?
Using either a Rust or JavaScript client library I would like to get the amount of DOT that is currently being unbonded on the relay chain.
Some staking information is available in the Polkadot JS ...
- 379
9
votes
1
answer
543
views
How to get the balance of an account at a particular nonce using Polkadot.js API
I want get the balance of an account address at a particular nonce.
I only know how to get the latest balance of an account address and its latest nonce (total number of transactions sent from that ...
- 111
2
votes
1
answer
51
views
How to use the .multi() method? (substrate-front-end-template)
I finished the substrate kitty tutorial (backend and frontend). Now I would like to build a simple frontend for the RMRK pallet. Now I stuck on the .multi(...) method. Where can I find a documentation ...
- 91
1
vote
1
answer
72
views
Invalid params: unknown field `storageDepositLimit` Error when getting contract data from a chain
I deploy the flipper contract to Jupiter testnet, when I try to get the contract data, I got this error message although it works just fine on a local node. (I also tested on other test networks and ...
- 1,009
1
vote
2
answers
711
views
Transaction would exhaust the block limits error when calling a smart contract from Polkadot JS API
I'm trying to call a smart contract using the Polkadot JS API (like here). The contract function is really simple, it takes 2 strings: a key and a value as input parameters, then adds the key, value ...
- 1,009
0
votes
2
answers
194
views
Error encountered could not complete yarn install of substrate front end template
Followed the installation steps provided here
https://docs.substrate.io/tutorials/v3/create-your-first-substrate-chain/
Steps taken with node version v16.14.0
git clone https://github.com/substrate-...
- 121
1
vote
1
answer
161
views
OutOfGas Error when trying to read contract data using Polkadot JS API
I'm trying to read the flipper contract data from a contract in a local node, following the code in here.
This is my code:
// Required imports
const { ApiPromise, WsProvider } = require("@...
- 1,009