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javascript - 使用 javascript 将值返回到 html 时，我的 Solidity map(int,string) 出现函数错误。

问题描述

我无法通过对我的 Solidity 智能合约函数的 JavaScript 函数调用来更新我的标签。我正在尝试创建一个（整数，字符串）映射，以便通过单击按钮以 HTML 格式显示值。出于某种原因，threatActor.getActor(1,function(error, result)返回 NULL。

有人可以看看并帮助我朝着正确的方向前进吗？谢谢你。

HTML 代码： 

 <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>

    <link rel="stylesheet" type="text/css" href="main.css">

    <script src="/home/zachary/employee-eth/node_modules/web3/dist/web3.min.js"></script>


</head>
<body>
    <div class="container">
    <div class="container1">

        <label for="labels" class="col-lg-2 control-label">Labels: </label>
        <input id="labels" type="text">

        <label for="aliases" class="col-lg-2 control-label">Aliases: </label>
        <input id="aliases" type="text">

        <label for="roles" class="col-lg-2 control-label">Roles: </label>
        <input id="roles" type="text">

        <label for="goals" class="col-lg-2 control-label">Goals: </label>
        <input id="goals" type="text">

        <label for="resource_level" class="col-lg-2 control-label">Organization: </label>
        <input id="resource_level" type="text">

        <label for="sophistication" class="col-lg-2 control-label">Sophistication: </label>
        <input id="sophistication" type="text">

        <label for="primary_motivation" class="col-lg-2 control-label">Primary Motivation: </label>
        <input id="primary_motivation" type="text">

        <button id="buttonSet">Submit Threat</button>
        <div id="container">
        <div id="container1"><button id="buttonGet">Get Threats by ID</button></div>
        <div id="container2"><input id="getId" type="text" value="1"></div>
        </div>

    </div>
    <div class="container2">

        <h1>Actor Attributes</h1>

        <label for="actorID" class="col-lg-2 control-label">ID: </label>
        <label id="actorID_d" class="col-lg-2 control-label">Empty</label>

        <label for="labels" class="col-lg-2 control-label">Labels: </label>
        <label id="labels_d" class="col-lg-2 control-label">Empty</label>

        <label for="aliases" class="col-lg-2 control-label">Aliases: </label>
        <label id="aliases_d" class="col-lg-2 control-label">Empty</label>

        <label for="roles" class="col-lg-2 control-label">Roles: </label>
        <label id="roles_d" class="col-lg-2 control-label">Empty</label>

        <label for="goals" class="col-lg-2 control-label">Goals: </label>
        <label id="goals_d" class="col-lg-2 control-label">Empty</label>

        <label for="resource_level" class="col-lg-2 control-label">Organization: </label>
        <label id="resource_level_d" class="col-lg-2 control-label">Empty</label>

        <label for="sophistication" class="col-lg-2 control-label">Sophistication: </label>
        <label id="sophistication_d" class="col-lg-2 control-label">Empty</label>

        <label for="primary_motivation" class="col-lg-2 control-label">Primary Motivation: </label>
        <label id="primary_motivation_d" class="col-lg-2 control-label">Empty</label>

    </div>
</div>
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>

    <script>

        if (typeof web3 !== 'undefined') {
            web3 = new Web3(web3.currentProvider);
        } else {
            web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
        }
        web3.eth.defaultAccount = web3.eth.accounts[0];
        var threatActorContract = web3.eth.contract([
    {
        "constant": false,
        "inputs": [
            {
                "name": "_labels",
                "type": "string"
            },
            {
                "name": "_aliases",
                "type": "string"
            },
            {
                "name": "_roles",
                "type": "string"
            },
            {
                "name": "_goals",
                "type": "string"
            },
            {
                "name": "_resource_level",
                "type": "string"
            },
            {
                "name": "_sophistication",
                "type": "string"
            },
            {
                "name": "_primary_motivation",
                "type": "string"
            }
        ],
        "name": "addActor",
        "outputs": [],
        "payable": false,
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "constant": true,
        "inputs": [
            {
                "name": "",
                "type": "uint256"
            }
        ],
        "name": "actors",
        "outputs": [
            {
                "name": "labels",
                "type": "string"
            },
            {
                "name": "aliases",
                "type": "string"
            },
            {
                "name": "roles",
                "type": "string"
            },
            {
                "name": "goals",
                "type": "string"
            },
            {
                "name": "resource_level",
                "type": "string"
            },
            {
                "name": "sophistication",
                "type": "string"
            },
            {
                "name": "primary_motivation",
                "type": "string"
            }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
    },
    {
        "constant": true,
        "inputs": [],
        "name": "countActors",
        "outputs": [
            {
                "name": "",
                "type": "uint256"
            }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
    },
    {
        "constant": true,
        "inputs": [
            {
                "name": "_key",
                "type": "uint256"
            }
        ],
        "name": "getActor",
        "outputs": [
            {
                "name": "",
                "type": "string"
            },
            {
                "name": "",
                "type": "string"
            },
            {
                "name": "",
                "type": "string"
            },
            {
                "name": "",
                "type": "string"
            },
            {
                "name": "",
                "type": "string"
            },
            {
                "name": "",
                "type": "string"
            },
            {
                "name": "",
                "type": "string"
            }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
    }
]);

        var threatActor = threatActorContract.at("0xcf5f9fb59f9b22810c50a9158b393388c492c258");
        console.log(threatActor);

        $("#buttonSet").click(function() {
            threatActor.addActor($("#labels").val(), $("#aliases").val(), $("#roles").val(), $("#goals").val(),
            $("#resource_level").val(), $("#sophistication").val(), $("#primary_motivation").val());
        });

        $("#buttonGet").click(function() {

            threatActor.getActor(1,function(error, result) {

            if(!error)
                {
                    document.getElementById("#labels_d").innerHTML = result[0];
                    document.getElementById("#aliases_d").innerHTML = result[1];
                    document.getElementById("#roles_d").innerHTML = result[2];
                    document.getElementById("#goals_d").innerHTML = result[3];
                    document.getElementById("#resource_level_d").innerHTML = result[4];
                    document.getElementById("#sophistication_d").innerHTML = result[5];
                    document.getElementById("#primary_motivation_d").innerHTML = result[6];
                    console.log(result);
                }
                else {
                    console.error("ERROR!");
                }
        });

        });
    </script>

</body>
</html>

Solidity 智能合约代码：

 pragma solidity ^0.4.24;
    contract ThreatActors {

        uint actorAmount = 1;

        struct Actor{
            string labels;
            string aliases;
            string roles;
            string goals;
            string resource_level;
            string sophistication;
            string primary_motivation;
        }

       Actor[] public actors;


    function addActor(string _labels, string _aliases, string _roles, string _goals, string _resource_level, string _sophistication, string _primary_motivation) public
        {
            Actor memory actor = Actor(_labels, _aliases, _roles, _goals, _resource_level, _sophistication, _primary_motivation);

            actors.push(actor);

            actorAmount++;
        }


    function getActor(uint _key) view public returns (string, string, string, string, string, string, string) {
        return (actors[_key].labels, actors[_key].aliases, actors[_key].roles, actors[_key].goals, actors[_key].resource_level, actors[_key].sophistication, actors[_key].primary_motivation);
    }

    function countActors() view public returns (uint) {
        return actors.length;
    }

    }

标签： javascripthtmlsolidity

解决方案

所以当你说它返回 NULL 时，你的意思是result回调函数中的 NULL，对吗？如果是这样，我有一些猜测，但没有具体的：

  1. 传递给函数时，您的输入以某种方式翻译错误。它需要一个 uint256 并且你给数字文字 1。我必须假设这应该可以工作，但我通常坚持将我的数字包装在 BigNumber 中并且从未使用过文字（但同样，为什么它不起作用）。
  2. 您在 Solidity 中使用字符串。为了绝对控制我的结构大小和内存使用，我几乎从不使用动态数组。它们肯定有用途，但通常 a可以做mapping动态数组可以做的事情，并且 32 个字符（想我会指出来的。bytes32string
  3. 也许你的 web3 版本是错误的。我知道有些版本可以简单地调用函数，而其他版本更喜欢使用 call / send （取决于它是否是一个常量函数）。如果您使用的是 1.0，这可能是docs 中所见的情况。

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