How can I wait for transaction to confirm using TonWeb?

Answered

I'm writing a simple DApp on TON blockchain and using the tonweb JavaScript library to interact with it.

I need to first send a transaction, and then after it confirms on chain, perform some other code in JavaScript.

Example:

await ton.send('ton_sendTransaction', [{
        to: 'some address',
        value: '1000'
    }]
)
// wait for tx to confirm on chain
console.log('Done!')

I don't know how to wait for a transaction's confirmation.

  				
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Posted 
	2 years ago

								Edited 
	one year ago

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					Daniil Sedov
				
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You can save transaction hash before sending it and then query Toncenter API method getTransactionByInMessageHash to check if transaction with such hash was confirmed or not

Example:

// Sleep function:
const sleep = ms => new Promise(r => setTimeout(r, ms))

// `msg` is a Cell containing your external message
// Convert message Cell to BOC String
const boc = await msg.toBoc(false)

// Calculate it's hash
const hash = tonweb.utils.bytesToBase64(await msg.hash())

// Send message and run a loop until transaction with that hash confirms
await tonweb.sendBoc(boc)
var txs = []
while (txs.length == 0) {
    await sleep(1200) // some delay between API calls
    const resp = await fetch('https://toncenter.com/api/index/getTransactionByInMessageHash?&include_msg_body=false&msg_hash=' + encodeURIComponent(hash))
    txs = await resp.json()
}

console.log('Done!')

 						
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Posted 
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					Daniil Sedov
				
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-1

What if several transactions will be processed by the account between calls to the getTransactions()? You will probably match an incorrect transaction. You need to implement a more strict transaction matching for this to work reliably.

— Slava Fomin 2 years ago

-1

@<1485966303708581888|Slava Fomin> Yes you're right. I mentioned in the answer that it's just a simple approach. I'll update the answer now with more explanations

— Daniil Sedov 2 years ago

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