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When I called the receivepol1 contract function on the front-end webpage, the event text content of 'Transaction Successful111111: ' was not displayed on the front-end webpage. Why is this? Didn't the "Index" event in the contract get a response? But I checked the transaction hash information and found that the index event in the contract had been triggered, but why was the text content not displayed on the front-end webpage?

the solidity contract code as follows：

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.4;
import "@chainlink/contracts/src/v0.8/automation/interfaces/KeeperCompatibleInterface.sol";
contract Biao {
    event Index(uint256 indexed amount1);
    address payable public myself;
    constructor() {
        myself = payable(msg.sender);
    }
    function receivepol1() public payable returns (uint256){
        uint256 amount1 = 2;
        emit Index(amount1);
        return amount1;
    }
}

the javascript code as follows：

contract = new web3.eth.Contract(abi, contractAddress);
contract.events.Index({}, async function(error, event) {
  if (!error){
      console.log('Event detected:', event); 
      indexvalue = event.returnValues.amount1;
      var text = document.createElement('span');
      text.innerText = 'Transaction Successful111111: '; 
      text.style.position = 'absolute';
      text.style.top = '690px';
      text.style.left = '500px';
      text.style.color = 'black';
      text.style.fontSize = '14px';
      text.style.fontWeight = 'bold';
      text.style.backgroundColor = 'rgba(0,0,0,0.5)'; 
      text.style.padding = '5px'; 
      document.body.appendChild(text);
  } else {
      console.error('Error listening to Debug events:', error);
  }
});

the html code as follows：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>My DApp</title>
    <link rel="icon" href="aa.png" type="image/png">
</head>
<body>
    <h1>Welcome to My DApp</h1>
    <script src=".3.0/web3.min.js"></script>
    <script src="app.js"></script>
</body>
</html>

Why is there no text information displayed on the front end of the web page? Is it because the code in the javascript is incorrect?

本文标签： Unable to respond to events in a contract using the web3js library in javascript codeStack Overflow

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