eth_getFilterChanges

🚧

Disclaimer

Note 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:

eth_newFilter
eth_newPendingTransactionFilter
eth_newBlockFilter
Then use the fresh filter ID as the parameter for eth_getFilterChanges.

Description

Polling method for a filter, which returns an array of logs which occurred since last poll.

Parameters

1. QUANTITY - the filter id.

params: [  
  "0x16", // 22  
]

Returns

Array of log objects, or an empty array if nothing has changed since last poll.

• For filters created with eth_newBlockFilter the return are block hashes (DATA, 32 Bytes), e.g. ["0x3454645634534..."].
• For filters created with eth_newPendingTransactionFilter the return are transaction hashes (DATA, 32 Bytes), e.g. ["0x6345343454645..."].
• For filters created with eth_newFilter logs are objects with following params:
  • removed: TAG - true when the log was removed, due to a chain reorganization. false if its a valid log.
  • logIndex: QUANTITY - integer of the log index position in the block. null when its pending log.
  • transactionIndex: QUANTITY - integer of the transactions index position log was created from. null when its pending log.
  • transactionHash: DATA, 32 Bytes - hash of the transactions this log was created from. null when its pending log.
  • blockHash: DATA, 32 Bytes - hash of the block where this log was in. null when its pending. null when its pending log.
  • blockNumber: QUANTITY - the block number where this log was in. null when its pending. null when its pending log.
  • address: DATA, 20 Bytes - address from which this log originated.
  • data: DATA - contains zero or more 32 Bytes non-indexed arguments of the log.
  • topics: Array of DATA - Array of 0 to 4 32 Bytes DATA of indexed log arguments. (In solidity: The first topic is the hash of the signature of the event (e.g. Deposit(address,bytes32,uint256)), except you declared the event with the anonymous specifier.)