This is a case about React and Dapp.

I call web3j to sendTransaction and wait callback by chian fucntion. While error occur , I can't call the function inside App.

I descibe the situations below codes around error block.

Is it possible to call function handleError?

//My code
class App extends Component {
    constructor(props) {
        super(props);
            this.state = {
            status: ''
            };
    };
    
    startTrade(){
        web3.eth.sendTransaction({
            from: "0x123....",
            to: "0x456....", 
            value: web3.utils.toWei("2", "ether"),
        }).on('error', (error)=>{
            
            //If write this line,the browser shows directly:
            //Failed to compile
            //src\App.js
            //Line 62:7:  'handleFail' is not defined  no-undef     
            
            //handleError(); 
            
            //If add this. when error occurs,the console shows:
            //App.js:62 Uncaught TypeError: Cannot read properties of undefined (reading 'handleFail')
            
            //this.handleFail();

            //If I call otherHandle,It's work.
            //However I don't have the instance of App to change something...
            //otherHandle();
        }); 
    }
    handleError(){
       console.log("Do something..");
    }
    render(){ return();
    }
}
function otherHandle(){
    console.log("Do something..");
}