如何在 React 中渲染 div 和 script 标签？

Question

react 应用程序收到了一个可视化代码，我使用 unescape function 来获取字符串中的 HTML 代码。 该字符串有一个带有可视化 ID 的div标签和包含 javascript 的script标签，用于生成可视化。

import React from "react";
import parse from "html-react-parser";

export default function App() {
  // This code is received from the backend
  const vizCode =
    "%3Cdiv%20id%3D'chartdiv_1614071920146'%3E%3C%2Fdiv%3E%3Cscript%20type%3D'text%2Fjavascript'%3E%20var%20width_1614071920146%20%3D%20700%3Bvar%20height_1614071920146%20%3D%20700%3Bvar%20chart_1614071920146%20%3D%20c3.generate(%7Bbindto%3A%20'%23chartdiv_1614071920146'%2C%20size%3A%20%7B%20width%3A%20(width_1614071920146%20-%2020)%2C%20height%3A%20(height_1614071920146%20-%2020)%20%7D%2C%20data%3A%20%7Bcolumns%3A%20%5B%20%5B'%20'%2C%201.0%2C%201.0%2C%203.0%2C%205.0%2C%205.0%5D%20%5D%2C%20type%3A%20'spline'%7D%2C%20legend%3A%20%7Bshow%3Afalse%7D%2C%20axis%3A%20%7B%20x%3A%20%7B%20type%3A%20'category'%2C%20categories%3A%20%5B'New%20Course'%2C'group%20course%201'%2C'Testkurs%20'%2C'test_course'%2C'Moodle4CollaborativeMOOCs'%5D%20%7D%20%7D%7D)%3B%3C%2Fscript%3E";
  const unescapedVizCode = unescape(vizCode);
  console.log(unescapedVizCode);
  // Output -> <div id='chartdiv_1614071920146'></div><script type='text/javascript'> var width_1614071920146 = 700;var height_1614071920146 = 700;var chart_1614071920146 = c3.generate({bindto: '#chartdiv_1614071920146', size: { width: (width_1614071920146 - 20), height: (height_1614071920146 - 20) }, data: {columns: [ [' ', 1.0, 1.0, 3.0, 5.0, 5.0] ], type: 'spline'}, legend: {show:false}, axis: { x: { type: 'category', categories: ['New Course','group course 1','Testkurs ','test_course','Moodle4CollaborativeMOOCs'] } }});</script> 

  let objectData = parse(unescapedVizCode);
  let divData = objectData[0];
  let scriptData = objectData[1].props.dangerouslySetInnerHTML.__html;

  return (
    <div className="App">
      {objectData}
    </div>
  );
}

在这里，我提供了代码框链接

我使用了dangerouslySetInnerHtml来显示可视化但无法可视化图表。 我在公共文件夹中添加了一个 test.html 以在浏览器中显示可视化。 任何帮助深表感谢。

Answer 1

React/JSX 不处理脚本标签。 您必须显式加载它。 我建议您在组件可用时使用挂钩。

  useEffect(() => {
    const script = document.createElement('script');
    script.innerHTML = scriptData;
    document.getElementById('root').appendChild(script);
    return () => {
      document.getElementById('root').removeChild(script);
    };
  }, []);

此处的工作示例： https://codesandbox.io/s/render-c3d3-charts-in-react-forked-4xkt9?file=/src/App.js

顺便提一句。 请不要使用“unescape”，它已被弃用。 请改用“decodeURIComponent”。

Answer 2

好的，这个答案可以满足您的要求，但我不得不说：只有在您 100% 知道 vizCode 的来源并且可以信任它的情况下才使用它！ 一定要检查你不应该使用 eval 的原因

您的问题是，浏览器没有执行脚本内容。 我试过你的沙箱，当我添加它时它立即起作用了

eval(scriptData)

这是为我工作的整个代码：

export default function App() {
  // This code is received from the backend
  const vizCode =
    "%3Cdiv%20id%3D'chartdiv_1614071920146'%3E%3C%2Fdiv%3E%3Cscript%20type%3D'text%2Fjavascript'%3E%20var%20width_1614071920146%20%3D%20700%3Bvar%20height_1614071920146%20%3D%20700%3Bvar%20chart_1614071920146%20%3D%20c3.generate(%7Bbindto%3A%20'%23chartdiv_1614071920146'%2C%20size%3A%20%7B%20width%3A%20(width_1614071920146%20-%2020)%2C%20height%3A%20(height_1614071920146%20-%2020)%20%7D%2C%20data%3A%20%7Bcolumns%3A%20%5B%20%5B'%20'%2C%201.0%2C%201.0%2C%203.0%2C%205.0%2C%205.0%5D%20%5D%2C%20type%3A%20'spline'%7D%2C%20legend%3A%20%7Bshow%3Afalse%7D%2C%20axis%3A%20%7B%20x%3A%20%7B%20type%3A%20'category'%2C%20categories%3A%20%5B'New%20Course'%2C'group%20course%201'%2C'Testkurs%20'%2C'test_course'%2C'Moodle4CollaborativeMOOCs'%5D%20%7D%20%7D%7D)%3B%3C%2Fscript%3E";
  const unescapedVizCode = unescape(vizCode);
  console.log(unescapedVizCode);

  let objectData = parse(unescapedVizCode);
  let divData = objectData[0];
  let scriptData = objectData[1].props.dangerouslySetInnerHTML.__html;
  useEffect(()=>{
    eval(scriptData)
  }, [scriptData])
  return (
    <div className="App">
      {objectData}

    </div>
  );
}

Answer 3

我不确定它是否满足您的要求，但您可以使用window.open在iFrame或新选项卡中呈现 HTML 代码。

要在iFrame中打开，请使用以下代码：

const unescapedVizCode = unescape(vizCode);
window.open(unescapedVizCode, "myFrame");
return (
<div className="App">
<iframe name="myFrame"></iframe>
  {objectData}
</div>
);

或者您可以在新标签页中打开：

const unescapedVizCode = unescape(vizCode);
window.open(unescapedVizCode, "_blank");

Answer 4

尝试：

let objectData = parse(`<div className="App">${unescapedVizCode}</div>`);

return objectData;