v2.x
Web3 Integration
Generic Contract Call
If you have replaced your web3 provider with Fortmatic provider, nothing needs to be changed for web3 contract transactions to continue working. The following is an example on how to initiate a smart contract call.
Web3 Pre-1.0 Stable Versions
Web3 1.0 Beta Version
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// Initialize provider
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import Fortmatic from 'fortmatic';
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import Web3 from 'web3';
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const fm = new Fortmatic('YOUR_API_KEY');
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window.web3 = new Web3(fm.getProvider());
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// Get your contract ABI from compiled smart contract json
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const contractAbi = [{"constant": true,"inputs": [],"name": "name","outputs": [{"name": "","type": "string"}],"payable": false,"stateMutability": "view","type": "function"},{"constant": true,"inputs": [],"name": "getValue","outputs": [{"name": "","type": "string"}],"payable": false,"stateMutability": "view","type": "function"},{"constant": false,"inputs": [{"name": "_name","type": "string"}],"name": "setValue","outputs": [{"name": "","type": "string"}],"payable": false,"stateMutability": "nonpayable","type": "function"}];
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// Create contract object
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const contract = web3.eth.contract(contractAbi);
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// Instantiate contract
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const contractInstance = contract.at('0x4efA9a82bFE112a9174325561bcdD1c68044724c');
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// Get user account wallet address first
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web3.eth.getAccounts(function(error, accounts) {
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if (error) throw error;
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// Make the contract call.
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contractInstance.setValue.sendTransaction('Hello World', {from: accounts[0]}, function(error, txnHash) {
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if (error) throw error;
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console.log(txnHash);
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});
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});
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// Initialize provider
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import Fortmatic from 'fortmatic';
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import Web3 from 'web3';
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const fm = new Fortmatic('YOUR_API_KEY');
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window.web3 = new Web3(fm.getProvider());
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// Get your contract ABI from compiled smart contract json
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const contractAbi = [{"constant": true,"inputs": [],"name": "name","outputs": [{"name": "","type": "string"}],"payable": false,"stateMutability": "view","type": "function"},{"constant": true,"inputs": [],"name": "getValue","outputs": [{"name": "","type": "string"}],"payable": false,"stateMutability": "view","type": "function"},{"constant": false,"inputs": [{"name": "_name","type": "string"}],"name": "setValue","outputs": [{"name": "","type": "string"}],"payable": false,"stateMutability": "nonpayable","type": "function"}];
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// Create contract object
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const contractAddress = '0x4efA9a82bFE112a9174325561bcdD1c68044724c';
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// Instantiate contract
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const contract = new web3.eth.Contract(contractAbi, contractAddress);
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// Get user account wallet address first
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web3.eth.getAccounts().then((accounts) => {
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// Make the contract call.
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contract.methods.setValue(
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'Hello World',
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).send({from: accounts[0]})
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.once('transactionHash', (hash) => { console.log(hash); })
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.once('receipt', (receipt) => { console.log(receipt); });
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});
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