How do you take the number of input tokens when I metamask is integrated?

[gionna]

I have the following block:

The code included in Metamask:

    const ethereumButton = document.querySelector('.enableEthereumButton');
const sendEthButton = document.querySelector('.sendEthButton');
let accounts = [];
//Sending Ethereum to an address

sendEthButton.addEventListener('click', () => {

ethereum

.request({

method: 'eth_sendTransaction',

params: [

{

from: accounts[0],

to: '0x2f318C334780961FB129D2a6c30D0763d9a5C970',

value: '0x29a2241af62c0000',

gasPrice: '0x09184e72a000',

gas: '0x2710',

},

],

})

.then((txHash) => console.log(txHash))

.catch((error) => console.error);

});
ethereumButton.addEventListener('click', () => {

getAccount();

});
async function getAccount() {

accounts = await ethereum.request({ method: 'eth_requestAccounts' });

}

I need the user to take the number of tokens into shape, and after the button of the purchase has been pressed, the token ring has already been chosen.

Question: How do you do that?

[Alberto]

All records https://docs.metamask.io/guide/sending-transactions.html#transaction-parameters

sendEthButton.addEventListener('click', () => {
        const decimals = 18; // decimals для ETH
        const amount = 2; // кол-во эфира, которое нужно отправить
        const amountWithDecimals = amount * Math.pow(10, decimals) // кол-во токенов с учетом decimals
        const value = amountWithDecimals.toString(16); // превращаем в Hex
        window.ethereum
            .request({
                method: 'eth_sendTransaction',
                params: [
                    {
                        from: accounts[0],
                        to: '0x104017c4B28fBFd4A789d2B8b0E872562E3139f5',
                        value: value,
                        gasPrice: '0x09184e72a000',
                        gas: '0x2710',
                    },
                ],
            })
            .then((txHash) => console.log(txHash))
            .catch((error) => console.error);
    });

Important comments for the future:

1. Better use the library for the math of calculations. https://github.com/indutny/bn.js/ to eliminate errors of type 0.1 + 0.2 = 0.30000004 in js. Or else to choose https://mikemcl.github.io/bignumber.js/ For example.
2. Look at the library. https://web3js.readthedocs.io/en/v1.5.2/ ♪ In the future, it would be easier to scale the annex.
3. The formula amount * Math.pow(10, decimals) may be used for any token other than ETH. You really need a ready-to-be contract for that.