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20_minute_dapp's Introduction

Build a Dapp in 20 Minutes

Here are the tools we'll use in this tutorial:

  1. Web3 JS - enables client side app to talk to blockchain
  2. Metamask - enables browser to talk to blockchain
  3. Ganache - local development blockchain
  4. Remix - smart contract IDE

20_minute_dapp's People

Contributors

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20_minute_dapp's Issues

Compile error, Election.sol

defining constructors as functions with the same name as the contract is depreciated. Use "constructor(...) { ... }" instead of "function Election() public { ... }"

function Election() public {
candidateName = "Candidate 1";
}

should now be written

constructor() public {
candidateName = "Candidate 1";
}

Callback required when calling contract.setCandidate

When serving index.html from an HTTP Server, MetaMask complains that it requires a callback function when trying to set the candidate's name with contract.setCandidate($('input').val()):

Uncaught Error: The MetaMask Web3 object does not support synchronous methods like eth_sendTransaction without a callback parameter`

Adding a callback solved the issue:

$('form').on('submit', function(event) {
    event.preventDefault();
    contract.setCandidate($('input').val(), function (err, result) {
        $('#candidateName').html($('input').val());
    });
});

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