[英]Web3 how to subscribe to events? Cannot read property 'currentProvider' of undefined
I'm getting following error message when trying to subscribe to Events on a private ethereum blockchain:尝试订阅私有以太坊区块链上的事件时,我收到以下错误消息:
Cannot read property 'currentProvider' of undefined无法读取未定义的属性“currentProvider”
Setup of Web3: Web3 的设置:
const Web3 = require("web3"); this.web3 = new Web3(Web3.givenProvider || "ws://localhost:8545");
Works:作品:
this.factoryContract.getPastEvents(
"allEvents",
{
fromBlock: 0,
toBlock: "latest"
},
(err, events) => {
console.log(events);
}
);
Throws error:抛出错误:
this.factoryContract.events
.allEvents(
{
fromBlock: 0
},
(error, event) => {
console.log(event);
}
)
.on("data", event => {
console.log(event);
});
this.factoryContract.events
.TaskCreated(
{
fromBlock: 0
},
(error, event) => {
console.log(event);
}
);
Any ideas how to fix that / what the error is?任何想法如何解决/错误是什么?
Node version: 10.14.2 Web3: 1.0.0节点版本:10.14.2 Web3:1.0.0
This problem is an issue of the current web3 1.0.0.51 release and is supposed to be fixed in the next release.这个问题是当前 web3 1.0.0.51 版本的问题,应该在下一个版本中修复。 https://github.com/ethereum/web3.js/releases
https://github.com/ethereum/web3.js/releases
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