Questions tagged [events]
Solidity events and logging problems. Events allow the convenient usage of the EVM logging facilities, which in turn can be used to “call” JavaScript callbacks in the user interface of a dapp, which listen for these events.
134
questions with no upvoted or accepted answers
0
votes
1answer
237 views
Web3.js event.get not firing, whereas event.watch gives correct values
I am trying to do a simple test for events.
Following is solidity code.
Values received from chgEvent.watch are always correct.
But in chgEvent.get, results1 is empty. chgEvent.get does not get ...
0
votes
2answers
208 views
Solidity event function not appearing in web3
I have a contract with the following event (using 0.4.24):
event UpdateProgress(bool _gameInProgress);
I am registering the contract like this:
import Web3 from 'web3';
import address from './...
0
votes
1answer
33 views
Subscribing to multiple Transfer events of various ERC20s
I need to suscribe to Transfer events of couple of different ERC20s in order to catch transfers to my contract. And here is the question: to catch all those events I need to create instance of each ...
0
votes
1answer
112 views
About getPastLogs usage
"getPastLogs" can get past event log. I check the web3 documentation：
fromBlock - Number|String: The number of the earliest block ("latest" may be given to mean the most recent and "pending" ...
0
votes
1answer
38 views
Problem watching events without invoke functions in the Smart Contract
I have an event which is sent each time when a contract is deployed. It is launched in the constructor.
I have a Dapp where I want to watch this event to send a tx each time that a smart contract is ...
0
votes
0answers
31 views
Events show up on mined, disappear after
I have a function that fires an event at the end, I have more than one that works like this to create some kind of lifecycle through events.
I get the full event history for every event as excpected,...
0
votes
0answers
39 views
How to read ALL logs of a certain event
When I read event logs like this:
myContract.getPastEvents('myEventLogName', {
fromBlock: 0,
toBlock: 'latest'
})
.then(function(events){
console.log(events) // same results as the ...
0
votes
1answer
476 views
Proper way of using allEvents()
I'm trying to get all events for a contract:
let events = token.allEvents({fromBlock: creationBlock, toBlock: 'latest'}, (err, res) => {
try {
let result = events.get();
...
0
votes
0answers
58 views
can't read past event logs
const event = contractInst.Transfer({},{fromBlock: 0, toBlock: 'latest'});
events.get(function (error, result) {
if (!error) {
console.log(result);
}
});
The get ...
0
votes
1answer
322 views
How to get only past 2 days events using getPastEvents everytime?
How can the following query be modified to only fetch the past two days worth of events:
const events= await MyContract.getPastEvents("eventName", {
fromBlock: 0,
toBlock: "latest"
});
0
votes
1answer
373 views
How to see event name in etherscan.io transaction event log?
In etherscan.io, I want to be able to see the event name (signature) in the transaction page event log, like here.
Currently, I don't see it here.
I'll note that the transaction is indeed sent to a ...
0
votes
0answers
214 views
Listen to filtered events using web3js 0.19 (provided by infura)
I am working on a uport dApp. uPort by default uses web3 from rinkeby.infura.io which is web3 version 0.19. So no WebSocket available. I tried ZeroClientProvider but that leads to this error:
Error ...
0
votes
0answers
48 views
Events firing but bool variable not changing in value
Given a contract with an event as follows
contract test {
event LogEvent(
address a,
bool result
);
function testInputs(some parameters) public (){
....
...
0
votes
0answers
137 views
Unable to catch contract event using parity websockets
I have a contract deployed on ropsten which emits event when ether amount is deposited in it. I can see the event appearing in etherscan.
this.web3Socket = new Web3(new Web3.providers....
0
votes
0answers
85 views
When exactly do events fire
I have a web3J application that is supposed to deploy a contract (by calling a function on another contract) then listen for the contractCreatedEvent that is fired by the factoryContract and then call ...
0
votes
2answers
442 views
Do Etherscan stores all the events and transaction history?
To get the history of a transactions for an account, we have to traverse the whole chain everytime, but etherscan provides the entire history of all the accounts instantly.
Similarly it does the same ...
0
votes
1answer
887 views
How to use events to retrieve data from a transaction? PRIVATE CHAIN
i am using GETH for the architecture and deployment of my contract on a private chain and it works pretty fine, but unfortunately i want to return data from a transaction function and this makes me ...
0
votes
1answer
273 views
Why myContract.events.MyEvent([options][, callback]) does not return “data” and “logs”?
We have an event as follows :
event LogNewObject(address sender, bytes32 indexed id, bytes32 sub_states_types, bytes32 sub_states_values, address owner);
This event is called in following function :
...
0
votes
1answer
46 views
A common error at time of using web3 options
When i use some web3 options as follows, I receive a common error i.e.
TypeError: web3.[option] is not a function
For example :
TypeError: web3.toAscii is not a function
web3.toAscii(...
0
votes
0answers
594 views
Truffle Test Sell Event Assertion Error
When I test my selling event in truffle.So, the following error comes:-
The solidity code is :-
event Sell(address _buyer, uint256 _amount);
// Buy token
function buyTokens(uint256 _numberOfTokens) ...
0
votes
2answers
413 views
How to find the block, when contract was deployed
I have contract address, and I want to find the block number, when it was deployed, to use it for loading events for this contract. Is it possible?
0
votes
0answers
589 views
Listen to emitted event from front-end
Could somebody please provide me code that works to listen to an event from your front-end. It was working for me and there are a few tutorials that I've tried now to fix it but it still persists with ...
0
votes
1answer
287 views
How to prevent callback event occur twice?
Hi this is my web3 code
events.watch(function (error,result){
if (error) {
console.log('Error:'+JSON.stringify(error));
res.send({'status':0,'message':...
0
votes
0answers
130 views
Testrpc some times not returning event after transaction execution
I am using testrpc to test my contract
While executing some functions in my contract I have observed some inconstancy in responses from testrpc, Same function call give me 3 different results at ...
0
votes
0answers
67 views
Indexed event parameter only returns 1st character in address
pragma solidity ^0.4.13;
contract OwnedI {
/**
* Event emitted when a new owner has been set.
* @param previousOwner The previous owner, who happened to effect the change.
* @param ...
0
votes
1answer
133 views
How do I watch Events from multiple contracts
I wrote a script that is able to read events from one contract address and then paste it into a .csv. Now I would like to extend that script listening watching/reading the same event of several ...
0
votes
1answer
151 views
Iterating through events
I have events (fired some time ago by the contract) containing numbers.
I need to load them all, and then to draw a chart.
What I do:
contract.getInitBlock(function(error, value)
{
var ...
0
votes
1answer
77 views
Can not see Solidity events
I can see events in a private net, but when I connect to "real" net, I can not see them. Meaning .watch(function(err, result) is never called.
My theory is I am using lightning, and it probably means ...
0
votes
2answers
518 views
Events with string argument not working (not indexed)
I am trying to listen to an event on rinkeby test which I run locally. Every thing works fine when my argument is int such as event EventTester(int values); When I change the event argument to string ...
0
votes
0answers
128 views
Using events and logs to get function returned value with a simple example
My question is related to this one:
Can a contract function both change the state and return a value when it's called externally
Question: How to read event/log content?
I have a contract like:...
0
votes
1answer
133 views
Watching for events returns 0 blocknumber
I am trying to listen for recently mined events from a live smartcontract(EtherDelta).
//https://github.com/praneethmendu/ethualizer/blob/master/backnd.js
tradeEvent = contractIns.Trade(...
0
votes
1answer
491 views
Simple event watching with testrpc - unexpected output
Working with this example, I've been attempting to utilise event watching from the web js api.
Window 1 (a testrpc instance with filled account):
testrpc -a 1
Window 2
geth attach rpc:http://...
0
votes
0answers
573 views
Regarding Event Generation Cost
Lets say events are invoked from all the methods of a contract. Each event is storing some data. The methods where only computation or data fetching logic is applied will it cost ether if any event is ...
-1
votes
1answer
59 views
Capture Solidity Emit Events without Web3 — E.g., Calling via Postman
Is there some way to capture Solidity Emit Events without the use of Web3? For example, I am calling via Postman JSON RPC eth_sendTransaction. How to capture the returned results?
