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eth_getFilterChanges
method.
DisclaimerNote that the default interactive example in this page will not work as the filter will be expired.To test
eth_getFilterChanges
in this page, first create a new filter using one of the following:Then use the fresh filter ID as the parameter for eth_getFilterChanges
.Parameters
string
— the filter ID of the filter for which you want to retrieve the changes
Response
array
— an array that represents the changes that have occurred on the blockchain since the last time the filter was polled:- For filters created with
eth_newBlockFilter
:blockHash
— the hashes of the new blocks since the last time the filter was polled.
- For filters created with
eth_newPendingTransactionFilter
:transactionHash
— the hashes identifying new pending transactions since the last time the filter was polled.
- For filters created with
eth_newFilter
, the following event logs:address
— the contract address from which the event originated.topics
— an array of 32-byte data fields containing indexed event parameters.data
— the non-indexed data that was emitted along with the event.blocknumber
— the block number in which the event was included.null
if it is pending.transactionhash
— the hash of the transaction that triggered the event.null
if pending.transactionindex
— the integer index of the transaction within the block’s list of transactions.null
if it is pending.blockhash
— the hash of the block in which the event was included.null
if it is pending.logindex
— the integer identifying the index of the event within the block’s list of events.null
if pending.removed
— the boolean value indicating if the event was removed from the blockchain due to a chain reorganization.True
if the log was removed.False
if it is a valid log.
- For filters created with
eth_getFilterChanges
code examples
Note that the
web3.eth.filter
methods have been deprecated and replaced with the web3.eth.subscribe
in web3.js. See web3.js subscriptions.Use case
Theeth_getFilterChanges
method can poll a filter to periodically retrieve new data. You can, for example, create a blocks filter using eth_newBlockFilter and periodically poll it to get new blocks.Body
application/json
Response
200 - application/json
The filter changes.
The response is of type object
.