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How do I prompt a transaction to MetaMask using web3/truffle? Like if I want a charge a user x amount of ether, and have them confirm the transaction via MetaMask.

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Be sure you've set the right provider (i.e. web3 = new Web3(web3.currentProvider) to use MetaMask's injected provider), and then just make the transaction: web3.eth.sendTransaction(...).

  • On my local net, there was no authorization used. – quantumpotato Jan 15 '18 at 22:30
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Look out for this update.

window.addEventListener('load', async () => {
// Modern dapp browsers...
if (window.ethereum) {
    window.web3 = new Web3(ethereum);
    try {
        // Request account access if needed
        await ethereum.enable();
        // Acccounts now exposed
        web3.eth.sendTransaction({/* ... */});
    } catch (error) {
        // User denied account access...
    }
}
// Legacy dapp browsers...
else if (window.web3) {
    window.web3 = new Web3(web3.currentProvider);
    // Acccounts always exposed
    web3.eth.sendTransaction({/* ... */});
}
// Non-dapp browsers...
else {
    console.log('Non-Ethereum browser detected. You should consider trying MetaMask!');
}
});

See this article for more on this update: https://medium.com/metamask/https-medium-com-metamask-breaking-change-injecting-web3-7722797916a8

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