[英]Solidity function returning true in remix but false in web3 function call
[英]Web3 Call Back Issue for Function - Solidity
我正在嘗試將合同連接到我的私有RPC服務器。 我希望能夠在我的html頁面上更新一個計數器參數,該參數繼而引用我的團結合同文件並在我的瀏覽器上進行更新。 但是,我不斷遇到下面的html文件的關注錯誤。 index.html和contract.sol也包括在下面。 TY!
<!doctype html>
<html>
<head>
<title>myDapp</title>
<script src="web3.js/dist/web3.min.js"></script>
<script type="text/javascript">
var contract_address = "0x68FDbd58D28BeD866E07906f6129bAC86161e243";
var contract_abi = [ { "constant": true, "inputs": [], "name": "getCreator", "outputs": [ { "name": "", "type": "address", "value": "0xc0f0fb70a63e7b345932da8eb427463f586be95d" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [], "name": "kill", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "myNewNumber", "type": "uint256" } ], "name": "setMyNumber", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "getMyNumber", "outputs": [ { "name": "", "type": "uint256", "value": "3" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "inputs": [], "payable": false, "stateMutability": "nonpayable", "type": "constructor" } ];
if (typeof web3 !== 'undefined') {
web3 = new Web3(web3.currentProvider);
} else {
// set the provider you want from Web3.providers
web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
}
var contract_instance = web3.eth.contract(contract_abi).at(contract_address);
console.log(contract_instance);
function getCounter() {
document.getElementById("myCounter").innerText = contract_instance.getMyNumber().toNumber().call;
}
</script>
</head>
<body>
<h1>Interact with a contract</h1>
<button onclick="getCounter()">Update Counter</button>
<button onclick="increaseCounter()">Increase Counter</button>
<span id="myCounter"></span> Counter
</body>
</html>
合同
pragma solidity ^0.4.15;
contract MyContract {
address creator;
uint256 myNumber;
function MyContract() public {
creator = msg.sender;
myNumber = 3;
}
function getCreator() public constant returns(address) {
return creator;
}
function getMyNumber() public constant returns(uint256) {
return myNumber;
}
function setMyNumber(uint256 myNewNumber) public {
myNumber = myNewNumber;
}
function kill() public {
if(msg.sender == creator) {
selfdestruct(creator);
}
}
}
問題是您試圖將Metamask
直接與web3.js
連接,而不是應該這樣做。 元掩碼基於提供程序引擎 ,提供程序inge不支持同步功能或操作,例如:
你不能做web3.eth.accounts
但您可以執行web3.eth.getAcounts()
。
為了最好地工作,最好使用提供程序引擎注入web3並從那里獲取它,您將注意到如何使事情運行,將所有內容切換為異步格式。
但在所有情況下都使用web3.js異步函數,您將獲得所需的內容。
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