javascript - 在 ReactJS 中解析和显示 JSON 对象时出现错误

Question

我正在尝试在我正在创建的仪表板上解析和显示一个大型 JSON 对象，并且我认为由于我在组件中格式化 javascript 的方式而出现错误。这是代码:

import React, { Component } from 'react'; 

class WhoIs extends Component {

  render() {

    var origObject = {"id":3,"code":"\nfrom ipwhois import IPWhois\nimport json\nobj = IPWhois('104.24.114.36')\nresults = obj.lookup_rdap(depth=1)\nprint(json.dumps(results))\n","state":"available","output":{"status":"ok","execution_count":3,"data":{"text/plain":"{\"raw\": null, \"entities\": [\"CLOUD14\", \"ABUSE2916-ARIN\", \"ADMIN2521-ARIN\", \"NOC11962-ARIN\"], \"asn_registry\": \"arin\", \"network\": {\"status\": null, \"handle\": \"NET-104-16-0-0-1\", \"name\": \"CLOUDFLARENET\", \"links\": [\"https://rdap.arin.net/registry/ip/104.16.0.0\", \"https://whois.arin.net/rest/net/NET-104-16-0-0-1\"], \"raw\": null, \"country\": null, \"ip_version\": \"v4\", \"start_address\": \"104.16.0.0\", \"notices\": [{\"description\": \"By using the ARIN RDAP/Whois service, you are agreeing to the RDAP/Whois Terms of Use\", \"links\": [\"https://www.arin.net/whois_tou.html\"], \"title\": \"Terms of Service\"}], \"end_address\": \"104.31.255.255\", \"remarks\": [], \"parent_handle\": \"NET-104-0-0-0-0\", \"cidr\": \"104.16.0.0/12\", \"type\": null, \"events\": [{\"action\": \"last changed\", \"timestamp\": \"2017-02-17T18:08:30-05:00\", \"actor\": null}, {\"action\": \"registration\", \"timestamp\": \"2014-03-28T10:30:55-04:00\", \"actor\": null}]}, \"objects\": {\"CLOUD14\": {\"status\": null, \"roles\": [\"registrant\"], \"handle\": \"CLOUD14\", \"entities\": [\"ABUSE2916-ARIN\", \"ADMIN2521-ARIN\", \"NOC11962-ARIN\"], \"links\": [\"https://rdap.arin.net/registry/entity/CLOUD14\", \"https://whois.arin.net/rest/org/CLOUD14\"], \"raw\": null, \"notices\": null, \"contact\": {\"kind\": \"org\", \"name\": \"Cloudflare, Inc.\", \"title\": null, \"phone\": null, \"role\": null, \"address\": [{\"type\": null, \"value\": \"101 Townsend Street\\nSan Francisco\\nCA\\n94107\\nUnited States\"}], \"email\": null}, \"events_actor\": null, \"remarks\": [], \"events\": [{\"action\": \"last changed\", \"timestamp\": \"2017-02-17T18:19:16-05:00\", \"actor\": null}, {\"action\": \"registration\", \"timestamp\": \"2010-07-09T13:10:42-04:00\", \"actor\": null}]}, \"ADMIN2521-ARIN\": {\"status\": [\"validated\"], \"roles\": [\"technical\"], \"handle\": \"ADMIN2521-ARIN\", \"entities\": null, \"links\": [\"https://rdap.arin.net/registry/entity/ADMIN2521-ARIN\", \"https://whois.arin.net/rest/poc/ADMIN2521-ARIN\"], \"raw\": null, \"notices\": null, \"contact\": {\"kind\": \"group\", \"name\": \"Admin\", \"title\": null, \"phone\": [{\"type\": [\"work\", \"voice\"], \"value\": \"+1-650-319-8930\"}], \"role\": null, \"address\": [{\"type\": null, \"value\": \"101 Townsend Street\\nSan Francisco\\nCA\\n94107\\nUnited States\"}], \"email\": [{\"type\": null, \"value\": \"rir@cloudflare.com\"}]}, \"events_actor\": null, \"remarks\": [], \"events\": [{\"action\": \"last changed\", \"timestamp\": \"2017-10-05T15:42:30-04:00\", \"actor\": null}, {\"action\": \"registration\", \"timestamp\": \"2011-04-19T15:11:36-04:00\", \"actor\": null}]}, \"ABUSE2916-ARIN\": {\"status\": [\"validated\"], \"roles\": [\"abuse\"], \"handle\": \"ABUSE2916-ARIN\", \"entities\": null, \"links\": [\"https://rdap.arin.net/registry/entity/ABUSE2916-ARIN\", \"https://whois.arin.net/rest/poc/ABUSE2916-ARIN\"], \"raw\": null, \"notices\": null, \"contact\": {\"kind\": \"group\", \"name\": \"Abuse\", \"title\": null, \"phone\": [{\"type\": [\"work\", \"voice\"], \"value\": \"+1-650-319-8930\"}], \"role\": null, \"address\": [{\"type\": null, \"value\": \"101 Townsend Street\\nSan Francisco\\nCA\\n94107\\nUnited States\"}], \"email\": [{\"type\": null, \"value\": \"abuse@cloudflare.com\"}]}, \"events_actor\": null, \"remarks\": [], \"events\": [{\"action\": \"last changed\", \"timestamp\": \"2017-02-17T18:11:38-05:00\", \"actor\": null}, {\"action\": \"registration\", \"timestamp\": \"2011-02-14T19:00:47-05:00\", \"actor\": null}]}, \"NOC11962-ARIN\": {\"status\": [\"validated\"], \"roles\": [\"noc\"], \"handle\": \"NOC11962-ARIN\", \"entities\": null, \"links\": [\"https://rdap.arin.net/registry/entity/NOC11962-ARIN\", \"https://whois.arin.net/rest/poc/NOC11962-ARIN\"], \"raw\": null, \"notices\": null, \"contact\": {\"kind\": \"group\", \"name\": \"NOC\", \"title\": null, \"phone\": [{\"type\": [\"work\", \"voice\"], \"value\": \"+1-650-319-8930\"}], \"role\": null, \"address\": [{\"type\": null, \"value\": \"101 Townsend Street\\nSan Francisco\\nCA\\n94107\\nUnited States\"}], \"email\": [{\"type\": null, \"value\": \"noc@cloudflare.com\"}]}, \"events_actor\": null, \"remarks\": [], \"events\": [{\"action\": \"last changed\", \"timestamp\": \"2017-02-17T18:15:44-05:00\", \"actor\": null}, {\"action\": \"registration\", \"timestamp\": \"2011-04-19T15:25:31-04:00\", \"actor\": null}]}}, \"asn_country_code\": \"US\", \"asn_date\": \"2014-03-28\", \"asn_cidr\": \"104.24.112.0/20\", \"nir\": null, \"query\": \"104.24.114.36\", \"asn\": \"13335\"}"}},"progress":1.0}; 
    var myTarget = origObject.output.data['text/plain'];
    var obj = JSON.parse(myTarget);

    for (var key in obj) {
      if (obj.hasOwnProperty(key)) {
        document.getElementById('mydiv').innerHTML
        console.log(key + " -> " + obj[key]);
      }
    }

    return (
      <div className="col-md-12 bucket">
          <div className="card">
              <div className="card-header">
                <span className="header-title">
                    Table Header
                </span>
                <span className="float-right">
                  <button className="btn btn-sm dl-btn"><i className="fa fa-download" aria-hidden="true"></i></button>
                </span>
              </div>
            <div className="card-block data-block">
              <div id="mydiv"></div>   
            </div>
          </div>
      </div>
    );
  }
}

export default WhoIs;

在 return() 之后，我有一个分配有“mydiv”的 div。如果我取出 document.getElementById 并仅使用 console.log，我会解析所有对象并且没有错误。根据我的理解，这种类型错误似乎来自 html div，分配的 id 放置在我的脚本代码之后，但我尝试将 JS 放置在 return() 之后，但它不起作用。我认为这是 React 的格式问题？？？任何帮助，将不胜感激。谢谢!

Answer 1

您可以创建一个值数组来在 JSX 中渲染，您可能永远不需要在 React 中使用 document.getElement :

render() {
    var origObject = {"id":3,"code":"\nfrom ipwhois import IPWhois\nimport json\nobj = IPWhois('104.24.114.36')\nresults = obj.lookup_rdap(depth=1)\nprint(json.dumps(results))\n","state":"available","output":{"status":"ok","execution_count":3,"data":{"text/plain":"{\"raw\": null, \"entities\": [\"CLOUD14\", \"ABUSE2916-ARIN\", \"ADMIN2521-ARIN\", \"NOC11962-ARIN\"], \"asn_registry\": \"arin\", \"network\": {\"status\": null, \"handle\": \"NET-104-16-0-0-1\", \"name\": \"CLOUDFLARENET\", \"links\": [\"https://rdap.arin.net/registry/ip/104.16.0.0\", \"https://whois.arin.net/rest/net/NET-104-16-0-0-1\"], \"raw\": null, \"country\": null, \"ip_version\": \"v4\", \"start_address\": \"104.16.0.0\", \"notices\": [{\"description\": \"By using the ARIN RDAP/Whois service, you are agreeing to the RDAP/Whois Terms of Use\", \"links\": [\"https://www.arin.net/whois_tou.html\"], \"title\": \"Terms of Service\"}], \"end_address\": \"104.31.255.255\", \"remarks\": [], \"parent_handle\": \"NET-104-0-0-0-0\", \"cidr\": \"104.16.0.0/12\", \"type\": null, \"events\": [{\"action\": \"last changed\", \"timestamp\": \"2017-02-17T18:08:30-05:00\", \"actor\": null}, {\"action\": \"registration\", \"timestamp\": \"2014-03-28T10:30:55-04:00\", \"actor\": null}]}, \"objects\": {\"CLOUD14\": {\"status\": null, \"roles\": [\"registrant\"], \"handle\": \"CLOUD14\", \"entities\": [\"ABUSE2916-ARIN\", \"ADMIN2521-ARIN\", \"NOC11962-ARIN\"], \"links\": [\"https://rdap.arin.net/registry/entity/CLOUD14\", \"https://whois.arin.net/rest/org/CLOUD14\"], \"raw\": null, \"notices\": null, \"contact\": {\"kind\": \"org\", \"name\": \"Cloudflare, Inc.\", \"title\": null, \"phone\": null, \"role\": null, \"address\": [{\"type\": null, \"value\": \"101 Townsend Street\\nSan Francisco\\nCA\\n94107\\nUnited States\"}], \"email\": null}, \"events_actor\": null, \"remarks\": [], \"events\": [{\"action\": \"last changed\", \"timestamp\": \"2017-02-17T18:19:16-05:00\", \"actor\": null}, {\"action\": \"registration\", \"timestamp\": \"2010-07-09T13:10:42-04:00\", \"actor\": null}]}, \"ADMIN2521-ARIN\": {\"status\": [\"validated\"], \"roles\": [\"technical\"], \"handle\": \"ADMIN2521-ARIN\", \"entities\": null, \"links\": [\"https://rdap.arin.net/registry/entity/ADMIN2521-ARIN\", \"https://whois.arin.net/rest/poc/ADMIN2521-ARIN\"], \"raw\": null, \"notices\": null, \"contact\": {\"kind\": \"group\", \"name\": \"Admin\", \"title\": null, \"phone\": [{\"type\": [\"work\", \"voice\"], \"value\": \"+1-650-319-8930\"}], \"role\": null, \"address\": [{\"type\": null, \"value\": \"101 Townsend Street\\nSan Francisco\\nCA\\n94107\\nUnited States\"}], \"email\": [{\"type\": null, \"value\": \"rir@cloudflare.com\"}]}, \"events_actor\": null, \"remarks\": [], \"events\": [{\"action\": \"last changed\", \"timestamp\": \"2017-10-05T15:42:30-04:00\", \"actor\": null}, {\"action\": \"registration\", \"timestamp\": \"2011-04-19T15:11:36-04:00\", \"actor\": null}]}, \"ABUSE2916-ARIN\": {\"status\": [\"validated\"], \"roles\": [\"abuse\"], \"handle\": \"ABUSE2916-ARIN\", \"entities\": null, \"links\": [\"https://rdap.arin.net/registry/entity/ABUSE2916-ARIN\", \"https://whois.arin.net/rest/poc/ABUSE2916-ARIN\"], \"raw\": null, \"notices\": null, \"contact\": {\"kind\": \"group\", \"name\": \"Abuse\", \"title\": null, \"phone\": [{\"type\": [\"work\", \"voice\"], \"value\": \"+1-650-319-8930\"}], \"role\": null, \"address\": [{\"type\": null, \"value\": \"101 Townsend Street\\nSan Francisco\\nCA\\n94107\\nUnited States\"}], \"email\": [{\"type\": null, \"value\": \"abuse@cloudflare.com\"}]}, \"events_actor\": null, \"remarks\": [], \"events\": [{\"action\": \"last changed\", \"timestamp\": \"2017-02-17T18:11:38-05:00\", \"actor\": null}, {\"action\": \"registration\", \"timestamp\": \"2011-02-14T19:00:47-05:00\", \"actor\": null}]}, \"NOC11962-ARIN\": {\"status\": [\"validated\"], \"roles\": [\"noc\"], \"handle\": \"NOC11962-ARIN\", \"entities\": null, \"links\": [\"https://rdap.arin.net/registry/entity/NOC11962-ARIN\", \"https://whois.arin.net/rest/poc/NOC11962-ARIN\"], \"raw\": null, \"notices\": null, \"contact\": {\"kind\": \"group\", \"name\": \"NOC\", \"title\": null, \"phone\": [{\"type\": [\"work\", \"voice\"], \"value\": \"+1-650-319-8930\"}], \"role\": null, \"address\": [{\"type\": null, \"value\": \"101 Townsend Street\\nSan Francisco\\nCA\\n94107\\nUnited States\"}], \"email\": [{\"type\": null, \"value\": \"noc@cloudflare.com\"}]}, \"events_actor\": null, \"remarks\": [], \"events\": [{\"action\": \"last changed\", \"timestamp\": \"2017-02-17T18:15:44-05:00\", \"actor\": null}, {\"action\": \"registration\", \"timestamp\": \"2011-04-19T15:25:31-04:00\", \"actor\": null}]}}, \"asn_country_code\": \"US\", \"asn_date\": \"2014-03-28\", \"asn_cidr\": \"104.24.112.0/20\", \"nir\": null, \"query\": \"104.24.114.36\", \"asn\": \"13335\"}"}},"progress":1.0}; 
    var myTarget = origObject.output.data['text/plain'];
    var obj = JSON.parse(myTarget);
    var results = [];
    for (var key in obj) {
      if (obj.hasOwnProperty(key)) {
        results.push(obj[key]);
      }
    }
    return (
        <div> 
            {results.map((value) => <p> {value} </p>)}
        </div>
    );
}

如果您正在解析的 JSON 是一个常量，您应该考虑在 constructor 或 componentDidMount 中进行解析，因为在渲染中执行此操作会在每次渲染时重新解析您的对象(如果组件状态发生变化)