(React Native) 显示数组中项目的卡片列表

Question

我有两个数组，比方说单词和定义

export default class Dictionary extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
        word: [],
        definition:[],
        index: 0
    };    
}

我有道具

<Card word = {w} definition = {d}/>

我想为数组中的每个 word/definition 对显示这些卡片的列表。如果有 5 words/definitions，那么我希望其中 5 张卡片显示在 ScrollableView 中。我怎样才能做到这一点？谢谢！

Answer 1

您可以在 Array.prototype.map 函数的回调中使用 Array.prototype.map function.The 第二个参数是索引。您可以使用该索引来显示相应的 definition 项，如下所示

export default class Dictionary extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
        word: ["a","b","c"],
        definition:["a","b","c"],
        index: 0
    };    

    render() {
       <div>
       {this.state.word.map((w,i) => {
          return <Card word = {w} definition = {this.state.definition[i]}/> 
       })}
       </div>
    }
}

Answer 2

在您所在的州，您可以将单词和定义合并为一件事，例如：

dictionary: [
  {
    index: 0,
    word: 'Car',
    definition: 'Definition of car',
  },
  // More objects like the one above
]

然后编写一个函数来渲染这个对象数组，可能是这样的：

renderDictionary() {
  return (this.state.dictionary.map(word => {
    <Card key={word.index} word={word.word} definition={word.definition} />
  }));
}

然后你只需调用函数：

export default class Dictionary extends React.Component {
  constructor(props) {
    super(props);

    this.state = {
      dictionary: [
        {
          index: 0,
          word: 'Car',
          definition: 'Definition of car',
        },
        // More objects like the one above.
      ],
    };
  }

  renderDictionary() {
    return (this.state.dictionary.map(word => {
      <Card key={word.index} word={word.word} definition={word.definition} />
    }));
  }

  render () {
    return (
      <View>
        {this.renderDictionary()}
      </View>
    );
  }
}

(React Native) 显示数组中项目的卡片列表

(React Native) Displaying a list of cards for items in an array

javascript

reactjs

mobile

native