javascript-嵌套数组映射

class Array extends React.Component {
  constructor() {
        super();
        this.state = {
            newArray: [
                  {
                    "Category": "Category1","value": [
                      {
                        "Name": "Name1"
                      },{
                        "Name": "Name2"
                      },{
                        "Name": "Name4"
                      }
                    ]
                  },{
                    "Category": "Category2","value": [
                      {
                        "Name": "Name3"
                      }
                    ]
                  }
                ],};
    }

  render() {
    var nestedArray = this.state.newArray.map((title,index) => {
      return(
        <div key={`nestedArray_${index}`}>
          <div key={`category_${title}`}>{title.Category}</div>
        </div>
      )
    })

    return (
      <div>
        <h1>{nestedArray}</h1>
      </div>
    );
  }
}

ReactDOM.render(
  <Array />,document.getElementById('root')
);

当前代码的Codepen：https://codepen.io/anon/pen/GePyBa

我现在显示如下：

Category1

Category2

理想情况下,我希望它是：

Category1

Name1

Name2

Name4

Category2

Name3

我已经尝试过寻找答案,但是没有任何实际效果.

我尝试做这样的事情,但是不起作用：

 render() {
    var innerArray = this.state.newArray.map((values) => {
      return {this.state.newArray.value[values].map((name,index) => {
        return (
          <div key={`value_${name}`}>{name.Name}</div>
        )
      })}
    })
    var nestedArray = this.state.newArray.map((title,index) => {
      return(
        <div key={`nestedArray_${index}`}>
          <div key={`category_${title}`}>{title.Category}</div>
          {innerArray}
        </div>
      )
    })

    return (
      <div>
        <h1>{nestedArray}</h1>
      </div>
    );
  }

Java和React的新手,非常感谢您的帮助.

最佳答案

您还希望在每个标题对象的每个值数组上使用map来呈现所有Name属性.

例

class App extends React.Component {
  state = {
    newArray: [
      {
        Category: "Category1",value: [
          {
            Name: "Name1"
          },{
            Name: "Name2"
          },{
            Name: "Name4"
          }
        ]
      },{
        Category: "Category2",value: [
          {
            Name: "Name3"
          }
        ]
      }
    ]
  };

  render() {
    var nestedArray = this.state.newArray.map((title,index) => {
      return (
        <div key={index}>
          <h1>{title.Category}</h1>
          {title.value.map((val,index) => (
            <div key={index}>{val.Name}</div>
          ))}
        </div>
      );
    });

    return (
      <div>
        {nestedArray}
      </div>
    );
  }
}

ReactDOM.render(<App />,document.getElementById("root"));

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>

<div id="root"></div>

原文链接：/js/531240.html

javascript-嵌套数组映射

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