Contract

The web3.eth.Contract makes it easy to interact with smart contracts on the ethereum blockchain. For using contract package, first install Web3 package using: npm i web3 or yarn add web3 based on your package manager, after that contracts features can be used as mentioned in following snippet.

import { Web3 } from 'web3';

const web3 = new Web3('https://127.0.0.1:4545');
const abi = [...] as const; // your contract ABI

let contract = new web3.eth.Contract(abi,'0xdAC17F958D2ee523a2206206994597C13D831ec7');
await contract.methods.balanceOf('0xdAC17F958D2ee523a2206206994597C13D831ec7').call();

For using individual package install web3-eth-contract and web3-core packages using: npm i web3-eth-contract web3-core or yarn add web3-eth-contract web3-core. This is more efficient approach for building lightweight applications.

import { Web3Context } from 'web3-core';
import { Contract } from 'web3-eth-contract';

const abi = [...] as const; // your contract ABI

let contract = new web3.eth.Contract(
	abi,
	'0xdAC17F958D2ee523a2206206994597C13D831ec7'
	 new Web3Context('http://127.0.0.1:8545'));

await contract.methods.balanceOf('0xdAC17F958D2ee523a2206206994597C13D831ec7').call();

Generated Methods

Following methods are generated by web3.js contract object for each of contract functions by using its ABI.

send

This is used to send a transaction to the smart contract and execute its method. Note this can alter the smart contract state.

Parameters

options?: PayableTxOptions | NonPayableTxOptions

Returns

Web3PromiEvent : Web3 Promi Event

// using the promise
myContract.methods.myMethod(123).send({from: '0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe'})
	.then(function(receipt){
		// other parts of code to use receipt
	});

// using the event emitter
myContract.methods.myMethod(123).send({from: '0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe'})
	.on('transactionHash', function(hash){
		// ...
	})
	.on('confirmation', function(confirmationNumber, receipt){
		// ...
	})
	.on('receipt', function(receipt){
		// ...
	})
	.on('error', function(error, receipt) {
		// ...
	});

call

This will execute smart contract method in the EVM without sending any transaction. Note calling cannot alter the smart contract state.

Parameters

options?: PayableCallOptions | NonPayableCallOptions, block?: BlockNumberOrTag,

Returns

Promise : having results of call

let myContract = new web3.eth.Contract(abi, address);

myContract.methods.myFunction().call()
.then(console.log);

estimateGas

Returns the amount of gas consumed by executing the method in EVM without creating a new transaction on the blockchain. The returned amount can be used as a gas estimate for executing the transaction publicly. The actual gas used can be different when sending the transaction later, as the state of the smart contract can be different at that time.

Parameters

options?: PayableCallOptions, returnFormat: ReturnFormat = DEFAULT_RETURN_FORMAT as ReturnFormat,

Returns

Promise: The gas amount estimated.

const estimatedGas = await contract.methods.approve('0xdAC17F958D2ee523a2206206994597C13D831ec7', 300)
    .estimateGas();

encodeABI

Encodes the ABI for this method. The resulting hex string is 32-bit function signature hash plus the passed parameters in Solidity tightly packed format. This can be used to send a transaction, call a method, or pass it into another smart contract’s method as arguments. Set the data field on web3.eth.sendTransaction options as the encodeABI() result and it is the same as calling the contract method with contract.myMethod.send().

Some use cases for encodeABI() include: preparing a smart contract transaction for a multisignature wallet, working with offline wallets and cold storage and creating transaction payload for complex smart contract proxy calls.

Parameters

None

Returns

String: The encoded ABI.

const encodedABI = await contract.methods.approve('0xdAC17F958D2ee523a2206206994597C13D831ec7', 300)
    .encodeABI();

decodeMethodData

Decodes the given ABI-encoded data, revealing both the method name and the parameters used in the smart contract call. This function reverses the encoding process happens at the method encodeABI. It's particularly useful for debugging and understanding the interactions with and between smart contracts.

Parameters

data HexString: The string of ABI-encoded data that needs to be decoded. This should include the method signature and the encoded parameters.

Returns

Object: This object combines both the decoded parameters and the method name in a readable format. Specifically, the returned object contains:
- __method__ String: The name of the contract method, reconstructed from the ABI.
- __length__ Number: The number of parameters decoded.
- Additional properties representing each parameter by name, as well as their position and values.

Example

Given an ABI-encoded string from a transaction, you can decode this data to identify the method called and the parameters passed. Here's a simplified example:

const GreeterAbi = [
	{
		inputs: [
			{
				internalType: 'string',
				name: '_greeting',
				type: 'string',
			},
		],
		name: 'setGreeting',
		outputs: [],
		type: 'function',
	},
];
const contract = new Contract(GreeterAbi); // Initialize with your contract's ABI

// The ABI-encoded data string for "setGreeting('Hello World')"
const encodedData =
	'0xa41368620000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000b48656c6c6f20576f726c64000000000000000000000000000000000000000000';

try {
	const decoded = contract.decodeMethodData(encodedData);
	console.log(decoded.__method__); // Outputs: "setGreeting(string)"
	console.log(decoded); // Outputs the detailed parameter data
	// This tells that the method called was `setGreeting` with a single string parameter "Hello World":
	// {
	//   __method__: 'setGreeting(string)',
	//   __length__: 1,
	//   '0': 'Hello World',
	//   _greeting: 'Hello World'
	// }
} catch (error) {
	console.error(error);
}

createAccessList

This will create an access list a method execution will access when executed in the EVM. Note: You must specify a from address and gas if it’s not specified in options when instantiating parent contract object.

Parameters

options?: PayableCallOptions | NonPayableCallOptions, block?: BlockNumberOrTag,

Returns

Promise: The generated access list for transaction.

const accessList = await contract.methods.approve('0xbEe634C21c16F05B03B704BaE071536121e6cFeA', 300)
    .createAccessList({
        from: "0x9992695e1053bb737d3cfae4743dcfc4b94f203d"
   });

Type parameters

Name	Type
`Abi`	extends `ContractAbi`

Hierarchy

Web3Context<EthExecutionAPI, ContractSubscriptions>

↳ Contract

Implements

Web3EventEmitter<ContractEventEmitterInterface<Abi>>

Constructors

constructor

• new Contract<Abi>(jsonInterface, context?, returnFormat?): Contract<Abi>

Creates a new contract instance with all its methods and events defined in its ABI provided.

new web3.eth.Contract(jsonInterface[, address][, options])

Type parameters

Name	Type
`Abi`	extends `ContractAbi`

Parameters

Name	Type	Description
`jsonInterface`	`Abi`	The JSON interface for the contract to instantiate.
`context?`	`Web3Context`<`unknown`, `any`> \| `Partial`<`Web3ContextInitOptions`<`EthExecutionAPI`, { `logs`: typeof `ContractLogsSubscription` ; `newBlockHeaders`: typeof `NewHeadsSubscription` ; `newHeads`: typeof `NewHeadsSubscription` }>>	The context of the contract used for customizing the behavior of the contract.
`returnFormat?`	`DataFormat`	-

Returns

Contract<Abi>

The contract instance with all its methods and events.

Example
var myContract = new web3.eth.Contract([...], '0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe', {
  from: '0x1234567890123456789012345678901234567891', // default from address
  gasPrice: '20000000000' // default gas price in wei, 20 gwei in this case
});

To use the type safe interface for these contracts you have to include the ABI definitions in your TypeScript project and then declare these as const.

Example
const myContractAbi = [....] as const; // ABI definitions
const myContract = new web3.eth.Contract(myContractAbi, '0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe');

Overrides

Web3Context<EthExecutionAPI, ContractSubscriptions>.constructor

Properties

options

• Readonly options: ContractOptions

The options object for the contract instance. from, gas and gasPrice are used as fallback values when sending transactions.

myContract.options;
> {
    address: '0x1234567890123456789012345678901234567891',
    jsonInterface: [...],
    from: '0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe',
    gasPrice: '10000000000000',
    gas: 1000000
}

myContract.options.from = '0x1234567890123456789012345678901234567891'; // default from address
myContract.options.gasPrice = '20000000000000'; // default gas price in wei
myContract.options.gas = 5000000; // provide as fallback always 5M gas

syncWithContext

• syncWithContext: boolean = false

Set to true if you want contracts' defaults to sync with global defaults.

Accessors

BatchRequest

• get BatchRequest(): Object

Will return the Web3BatchRequest constructor.

Returns

Object

Inherited from

Web3Context.BatchRequest

blockHeaderTimeout

• get blockHeaderTimeout(): number

The blockHeaderTimeout is used over socket-based connections. This option defines the amount seconds it should wait for 'newBlockHeaders' event before falling back to polling to fetch transaction receipt. Default is 10 seconds.

Returns

number

Inherited from

Web3Context.blockHeaderTimeout

• set blockHeaderTimeout(val): void

Will set the blockHeaderTimeout

Parameters

Name	Type
`val`	`number`

Returns

void

Inherited from

Web3Context.blockHeaderTimeout

contractDataInputFill

• get contractDataInputFill(): "input" | "data" | "both"

The contractDataInputFill options property will allow you to set the hash of the method signature and encoded parameters to the property either data, input or both within your contract. This will affect the contracts send, call and estimateGas methods Default is data.

Returns

"input" | "data" | "both"

Inherited from

Web3Context.contractDataInputFill

• set contractDataInputFill(val): void

Will set the contractDataInputFill

Parameters

Name	Type
`val`	`"input"` \| `"data"` \| `"both"`

Returns

void

Inherited from

Web3Context.contractDataInputFill

currentProvider

• get currentProvider(): undefined | Web3BaseProvider<API>

Will return the current provider. (The same as provider)

Returns

undefined | Web3BaseProvider<API>

Returns the current provider

Example

const web3Context = new Web3Context("http://localhost:8545");
console.log(web3Context.provider);
> HttpProvider {
	clientUrl: 'http://localhost:8545',
	httpProviderOptions: undefined
 }

Inherited from

Web3Context.currentProvider

• set currentProvider(provider): void

Will set the current provider. (The same as provider)

Parameters

Name	Type	Description
`provider`	`undefined` \| `string` \| `LegacyRequestProvider` \| `LegacySendProvider` \| `LegacySendAsyncProvider` \| `EIP1193Provider`<`API`> \| `Web3BaseProvider`<`API`> \| `SimpleProvider`<`API`> \| `MetaMaskProvider`<`API`>	SupportedProviders The provider to set

Returns

void

Example

 const web3Context = new Web3Context("http://localhost:8545");
web3Context.currentProvider = "ws://localhost:8545";
console.log(web3Context.provider);
> WebSocketProvider {
_eventEmitter: EventEmitter {
_events: [Object: null prototype] {},
_eventsCount: 0,
...
}

Inherited from

Web3Context.currentProvider

defaultAccount

• get defaultAccount(): undefined | string

This default address is used as the default from property, if no from property is specified in for the following methods:

web3.eth.sendTransaction()
web3.eth.call()
myContract.methods.myMethod().call()
myContract.methods.myMethod().send()

Returns

undefined | string

Inherited from

Web3Context.defaultAccount

• set defaultAccount(val): void

Will set the default account.

Parameters

Name	Type
`val`	`undefined` \| `string`

Returns

void

Inherited from

Web3Context.defaultAccount

defaultBlock

• get defaultBlock(): BlockNumberOrTag

The default block is used for certain methods. You can override it by passing in the defaultBlock as last parameter. The default value is "latest".

web3.eth.getBalance()
web3.eth.getCode()
web3.eth.getTransactionCount()
web3.eth.getStorageAt()
web3.eth.call()
myContract.methods.myMethod().call()

Returns

BlockNumberOrTag

Inherited from

Web3Context.defaultBlock

• set defaultBlock(val): void

Will set the default block.

A block number
"earliest" - String: The genesis block
"latest" - String: The latest block (current head of the blockchain)
"pending" - String: The currently mined block (including pending transactions)
"finalized" - String: (For POS networks) The finalized block is one which has been accepted as canonical by greater than 2/3 of validators
"safe" - String: (For POS networks) The safe head block is one which under normal network conditions, is expected to be included in the canonical chain. Under normal network conditions the safe head and the actual tip of the chain will be equivalent (with safe head trailing only by a few seconds). Safe heads will be less likely to be reorged than the proof of work network's latest blocks.

Parameters

Name	Type
`val`	`BlockNumberOrTag`

Returns

void

Inherited from

Web3Context.defaultBlock

defaultCommon

• get defaultCommon(): undefined | Common

Will get the default common property The default common property does contain the following Common object:

customChain - Object: The custom chain properties
- name - string: (optional) The name of the chain
- networkId - number: Network ID of the custom chain
- chainId - number: Chain ID of the custom chain
baseChain - string: (optional) mainnet, goerli, kovan, rinkeby, or ropsten
hardfork - string: (optional) chainstart, homestead, dao, tangerineWhistle, spuriousDragon, byzantium, constantinople, petersburg, istanbul, berlin, or london Default is undefined.

Returns

undefined | Common

Inherited from

Web3Context.defaultCommon

• set defaultCommon(val): void

Will set the default common property

Parameters

Name	Type
`val`	`undefined` \| `Common`

Returns

void

Inherited from

Web3Context.defaultCommon

defaultHardfork

• get defaultHardfork(): string

Will return the default hardfork. Default is london The default hardfork property can be one of the following:

chainstart
homestead
dao
tangerineWhistle
spuriousDragon
byzantium
constantinople
petersburg
istanbul
berlin
london
'arrowGlacier',
'tangerineWhistle',
'muirGlacier'

Returns

string

Inherited from

Web3Context.defaultHardfork

• set defaultHardfork(val): void

Will set the default hardfork.

Parameters

Name	Type
`val`	`string`

Returns

void

Inherited from

Web3Context.defaultHardfork

enableExperimentalFeatures

• get enableExperimentalFeatures(): Object

The enableExperimentalFeatures is used to enable trying new experimental features that are still not fully implemented or not fully tested or still have some related issues. Default is false for every feature.

Returns

Object

Name	Type
`useRpcCallSpecification`	`boolean`
`useSubscriptionWhenCheckingBlockTimeout`	`boolean`

Inherited from

Web3Context.enableExperimentalFeatures

• set enableExperimentalFeatures(val): void

Will set the enableExperimentalFeatures

Parameters

Name	Type
`val`	`Object`
`val.useRpcCallSpecification`	`boolean`
`val.useSubscriptionWhenCheckingBlockTimeout`	`boolean`

Returns

void

Inherited from

Web3Context.enableExperimentalFeatures

events

• get events(): ContractEventsInterface<Abi, ContractEvents<Abi>>

Subscribe to an event.

await myContract.events.MyEvent([options])

There is a special event allEvents that can be used to subscribe all events.

await myContract.events.allEvents([options])

Returns

ContractEventsInterface<Abi, ContractEvents<Abi>>

When individual event is accessed will returns ContractBoundEvent object

givenProvider

Will return the givenProvider if available.

When using web3.js in an Ethereum compatible browser, it will set with the current native provider by that browser. Will return the given provider by the (browser) environment, otherwise undefined.

Returns

Inherited from

Web3Context.givenProvider

handleRevert

• get handleRevert(): boolean

The handleRevert options property returns the revert reason string if enabled for the following methods:

web3.eth.sendTransaction()
web3.eth.call()
myContract.methods.myMethod().call()
myContract.methods.myMethod().send() Default is false.

Note: At the moment handleRevert is only supported for sendTransaction and not for sendSignedTransaction

Returns

boolean

Inherited from

Web3Context.handleRevert

• set handleRevert(val): void

Will set the handleRevert

Parameters

Name	Type
`val`	`boolean`

Returns

void

Inherited from

Web3Context.handleRevert

ignoreGasPricing

• get ignoreGasPricing(): boolean

Will get the ignoreGasPricing property. When true, the gasPrice, maxPriorityFeePerGas, and maxFeePerGas will not be autofilled in the transaction object. Useful when you want wallets to handle gas pricing.

Returns

boolean

Inherited from

Web3Context.ignoreGasPricing

methods

• get methods(): ContractMethodsInterface<Abi>

Creates a transaction object for that method, which then can be called, send, estimated, createAccessList , or ABI encoded.

The methods of this smart contract are available through:

The name: myContract.methods.myMethod(123) The name with parameters: myContract.methods['myMethod(uint256)'](123) The signature myContract.methods['0x58cf5f10'](123)

This allows calling functions with same name but different parameters from the JavaScript contract object.

> The method signature does not provide a type safe interface, so we recommend to use method name instead.

// calling a method
const result = await myContract.methods.myMethod(123).call({from: '0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe'});

// or sending and using a promise
const receipt = await myContract.methods.myMethod(123).send({from: '0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe'});

// or sending and using the events
const sendObject = myContract.methods.myMethod(123).send({from: '0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe'});
sendObject.on('transactionHash', function(hash){
  ...
});
sendObject.on('receipt', function(receipt){
  ...
});
sendObject.on('confirmation', function(confirmationNumber, receipt){
  ...
});
sendObject.on('error', function(error, receipt) {
  ...
});

Returns

ContractMethodsInterface<Abi>

Either returns PayableMethodObject or NonPayableMethodObject based on the definitions of the ABI of that contract.

provider

• get provider(): undefined | Web3BaseProvider<API>

Will return the current provider.

Returns

undefined | Web3BaseProvider<API>

Returns the current provider

Example

const web3 = new Web3Context("http://localhost:8545");
console.log(web3.provider);
> HttpProvider {
	clientUrl: 'http://localhost:8545',
	httpProviderOptions: undefined
 }

Inherited from

Web3Context.provider

• set provider(provider): void

Will set the current provider.

Parameters

Name	Type	Description
`provider`	`undefined` \| `string` \| `LegacyRequestProvider` \| `LegacySendProvider` \| `LegacySendAsyncProvider` \| `EIP1193Provider`<`API`> \| `Web3BaseProvider`<`API`> \| `SimpleProvider`<`API`> \| `MetaMaskProvider`<`API`>	The provider to set Accepted providers are of type SupportedProviders

Returns

void

Example

 const web3Context = new web3ContextContext("http://localhost:8545");
web3Context.provider = "ws://localhost:8545";
console.log(web3Context.provider);
> WebSocketProvider {
_eventEmitter: EventEmitter {
_events: [Object: null prototype] {},
_eventsCount: 0,
...
}

Inherited from

Web3Context.provider

transactionBlockTimeout

• get transactionBlockTimeout(): number

The transactionBlockTimeout is used over socket-based connections. This option defines the amount of new blocks it should wait until the first confirmation happens, otherwise the PromiEvent rejects with a timeout error. Default is 50.

Returns

number

Inherited from

Web3Context.transactionBlockTimeout

• set transactionBlockTimeout(val): void

Will set the transactionBlockTimeout.

Parameters

Name	Type
`val`	`number`

Returns

void

Inherited from

Web3Context.transactionBlockTimeout

transactionConfirmationBlocks

• get transactionConfirmationBlocks(): number

This defines the number of blocks it requires until a transaction is considered confirmed. Default is 24.

Returns

number

Inherited from

Web3Context.transactionConfirmationBlocks

• set transactionConfirmationBlocks(val): void

Will set the transactionConfirmationBlocks.

Parameters

Name	Type
`val`	`number`

Returns

void

Inherited from

Web3Context.transactionConfirmationBlocks

transactionPollingInterval

• get transactionPollingInterval(): number

Used over HTTP connections. This option defines the number of seconds between Web3 calls for a receipt which confirms that a transaction was mined by the network. Default is 1000 ms.

Returns

number

Inherited from

Web3Context.transactionPollingInterval

• set transactionPollingInterval(val): void

Will set the transactionPollingInterval.

Parameters

Name	Type
`val`	`number`

Returns

void

Inherited from

Web3Context.transactionPollingInterval

transactionPollingTimeout

• get transactionPollingTimeout(): number

Used over HTTP connections. This option defines the number of seconds Web3 will wait for a receipt which confirms that a transaction was mined by the network. Note: If this method times out, the transaction may still be pending. Default is 750 seconds (12.5 minutes).

Returns

number

Inherited from

Web3Context.transactionPollingTimeout

• set transactionPollingTimeout(val): void

Will set the transactionPollingTimeout.

Parameters

Name	Type
`val`	`number`

Returns

void

Inherited from

Web3Context.transactionPollingTimeout

transactionReceiptPollingInterval

• get transactionReceiptPollingInterval(): undefined | number

The transactionPollingInterval is used over HTTP connections. This option defines the number of seconds between Web3 calls for a receipt which confirms that a transaction was mined by the network. Default is undefined

Returns

undefined | number

Inherited from

Web3Context.transactionReceiptPollingInterval

• set transactionReceiptPollingInterval(val): void

Will set the transactionReceiptPollingInterval

Parameters

Name	Type
`val`	`undefined` \| `number`

Returns

void

Inherited from

Web3Context.transactionReceiptPollingInterval

transactionSendTimeout

• get transactionSendTimeout(): number

The time used to wait for Ethereum Node to return the sent transaction result. Note: If the RPC call stuck at the Node and therefor timed-out, the transaction may still be pending or even mined by the Network. We recommend checking the pending transactions in such a case. Default is 750 seconds (12.5 minutes).

Returns

number

Inherited from

Web3Context.transactionSendTimeout

• set transactionSendTimeout(val): void

Will set the transactionSendTimeout.

Parameters

Name	Type
`val`	`number`

Returns

void

Inherited from

Web3Context.transactionSendTimeout

Methods

clone

▸ clone(): Contract<Abi>

Clones the current contract instance. This doesn't deploy contract on blockchain and only creates a local clone.

Returns

Contract<Abi>

The new contract instance.

const contract1 = new web3.eth.Contract(abi, address, {gasPrice: '12345678', from: fromAddress});

const contract2 = contract1.clone();
contract2.options.address = '0xdAC17F958D2ee523a2206206994597C13D831ec7';

(contract1.options.address !== contract2.options.address);
> true

deploy

▸ deploy(deployOptions?): DeployerMethodClass<Abi>

Call this function to deploy the contract to the blockchain. After successful deployment the promise will resolve with a new contract instance.

myContract.deploy({
  input: '0x12345...', // data keyword can be used, too.
  arguments: [123, 'My String']
})
.send({
  from: '0x1234567890123456789012345678901234567891',
  gas: 1500000,
  gasPrice: '30000000000000'
}, function(error, transactionHash){ ... })
.on('error', function(error){ ... })
.on('transactionHash', function(transactionHash){ ... })
.on('receipt', function(receipt){
 console.log(receipt.contractAddress) // contains the new contract address
})
.on('confirmation', function(confirmationNumber, receipt){ ... })
.then(function(newContractInstance){
  console.log(newContractInstance.options.address) // instance with the new contract address
});

// When the data is already set as an option to the contract itself
myContract.options.data = '0x12345...';

myContract.deploy({
  arguments: [123, 'My String']
})
.send({
  from: '0x1234567890123456789012345678901234567891',
  gas: 1500000,
  gasPrice: '30000000000000'
})
.then(function(newContractInstance){
  console.log(newContractInstance.options.address) // instance with the new contract address
});

// Simply encoding
myContract.deploy({
  input: '0x12345...',
  arguments: [123, 'My String']
})
.encodeABI();
> '0x12345...0000012345678765432'

// decoding
myContract.deploy({
  input: '0x12345...',
  // arguments: [123, 'My Greeting'] if you just need to decode the data, you can skip the arguments
})
.decodeData('0x12345...0000012345678765432');
> {
     __method__: 'constructor',
     __length__: 2,
     '0': '123',
     _id: '123',
     '1': 'My Greeting',
     _greeting: 'My Greeting',
  }

// Gas estimation
myContract.deploy({
  input: '0x12345...',
  arguments: [123, 'My String']
})
.estimateGas(function(err, gas){
  console.log(gas);
});

Parameters

Name	Type	Description
`deployOptions?`	`Object`	-
`deployOptions.arguments?`	`ContractConstructorArgs`<`Abi`>	The arguments which get passed to the constructor on deployment.
`deployOptions.data?`	`string`	The byte code of the contract.
`deployOptions.input?`	`string`	-

Returns

DeployerMethodClass<Abi>

The transaction object

extend

▸ extend(extendObj): this

This method allows extending the web3 modules. Note: This method is only for backward compatibility, and It is recommended to use Web3 v4 Plugin feature for extending web3.js functionality if you are developing something new.

Parameters

Name	Type
`extendObj`	`ExtensionObject`

Returns

this

Inherited from

Web3Context.extend

getPastEvents

▸ getPastEvents<ReturnFormat>(returnFormat?): Promise<(string | EventLog)[]>

Gets past events for this contract.

const events = await myContract.getPastEvents('MyEvent', {
  filter: {myIndexedParam: [20,23], myOtherIndexedParam: '0x123456789...'}, // Using an array means OR: e.g. 20 or 23
  fromBlock: 0,
  toBlock: 'latest'
});

> [{
  returnValues: {
      myIndexedParam: 20,
      myOtherIndexedParam: '0x123456789...',
      myNonIndexParam: 'My String'
  },
  raw: {
      data: '0x7f9fade1c0d57a7af66ab4ead79fade1c0d57a7af66ab4ead7c2c2eb7b11a91385',
      topics: ['0xfd43ade1c09fade1c0d57a7af66ab4ead7c2c2eb7b11a91ffdd57a7af66ab4ead7', '0x7f9fade1c0d57a7af66ab4ead79fade1c0d57a7af66ab4ead7c2c2eb7b11a91385']
  },
  event: 'MyEvent',
  signature: '0xfd43ade1c09fade1c0d57a7af66ab4ead7c2c2eb7b11a91ffdd57a7af66ab4ead7',
  logIndex: 0,
  transactionIndex: 0,
  transactionHash: '0x7f9fade1c0d57a7af66ab4ead79fade1c0d57a7af66ab4ead7c2c2eb7b11a91385',
  blockHash: '0xfd43ade1c09fade1c0d57a7af66ab4ead7c2c2eb7b11a91ffdd57a7af66ab4ead7',
  blockNumber: 1234,
  address: '0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe'
},{
  ...
}]

Type parameters

Name	Type
`ReturnFormat`	extends `DataFormat` = { `bytes`: `HEX` ; `number`: `BIGINT` }

Parameters

Name	Type	Description
`returnFormat?`	`ReturnFormat`	Return format

Returns

Promise<(string | EventLog)[]>

An array with the past event Objects, matching the given event name and filter.

link

▸ link<T>(parentContext): void

Link current context to another context.

Type parameters

Name	Type
`T`	extends `Web3Context`<`unknown`, `any`>

Parameters

Name	Type
`parentContext`	`T`

Returns

void

Inherited from

Web3Context.link

setProvider

▸ setProvider(provider?): boolean

Will set the provider.

Parameters

Name	Type	Description
`provider?`	`string` \| `LegacyRequestProvider` \| `LegacySendProvider` \| `LegacySendAsyncProvider` \| `EIP1193Provider`<`EthExecutionAPI`> \| `Web3BaseProvider`<`EthExecutionAPI`> \| `SimpleProvider`<`EthExecutionAPI`> \| `MetaMaskProvider`<`EthExecutionAPI`>	SupportedProviders The provider to set

Returns

boolean

Returns true if the provider was set

Inherited from

Web3Context.setProvider

use

▸ use<T, T2>(ContextRef, ...args): T

Use to create new object of any type extended by Web3Context and link it to current context. This can be used to initiate a global context object and then use it to create new objects of any type extended by Web3Context.

Type parameters

Name	Type
`T`	extends `Web3Context`<`unknown`, `any`>
`T2`	extends `unknown`[]

Parameters

Name	Type
`ContextRef`	`Web3ContextConstructor`<`T`, `T2`>
`...args`	[...T2[]]

Returns

T

Inherited from

Web3Context.use

Generated Methods​

send​

Parameters​

Returns​

call​

Parameters​

Returns​

estimateGas​

Parameters​

Returns​

encodeABI​

Parameters​

Returns​

decodeMethodData​

Parameters​

Returns​

Example​

createAccessList​

Parameters​

Returns​

Type parameters​

Hierarchy​

Implements​

Constructors​

constructor​

Type parameters​

Parameters​

Returns​

Overrides​

Properties​

options​

syncWithContext​

Accessors​

BatchRequest​

Returns​

Inherited from​

blockHeaderTimeout​

Returns​

Inherited from​

Parameters​

Returns​

Inherited from​

contractDataInputFill​

Returns​

Inherited from​

Parameters​

Returns​

Inherited from​

currentProvider​

Returns​

Inherited from​

Parameters​

Returns​

Inherited from​

defaultAccount​

Returns​

Inherited from​

Parameters​

Returns​

Inherited from​

defaultBlock​

Returns​

Inherited from​

Parameters​

Returns​

Inherited from​

defaultCommon​

Returns​

Inherited from​

Parameters​

Returns​

Inherited from​

defaultHardfork​

Returns​

Inherited from​

Parameters​

Returns​

Inherited from​

enableExperimentalFeatures​

Returns​

Generated Methods

send

Parameters

Returns

call

Parameters

Returns

estimateGas

Parameters

Returns

encodeABI

Parameters

Returns

decodeMethodData

Parameters

Returns

Example

createAccessList

Parameters

Returns

Type parameters

Hierarchy

Implements

Constructors

constructor

Type parameters

Parameters

Returns

Overrides

Properties

options

syncWithContext

Accessors

BatchRequest

Returns

Inherited from

blockHeaderTimeout

Returns

Inherited from

Parameters

Returns

Inherited from

contractDataInputFill

Returns

Inherited from

Parameters

Returns

Inherited from

currentProvider

Returns

Inherited from

Parameters

Returns

Inherited from

defaultAccount

Returns

Inherited from

Parameters

Returns

Inherited from

defaultBlock

Returns

Inherited from

Parameters

Returns

Inherited from

defaultCommon

Returns

Inherited from

Parameters

Returns

Inherited from

defaultHardfork

Returns

Inherited from

Parameters

Returns

Inherited from

enableExperimentalFeatures

Returns