Warning: file_get_contents(/data/phpspider/zhask/data//catemap/9/javascript/475.json): failed to open stream: No such file or directory in /data/phpspider/zhask/libs/function.php on line 167

Warning: Invalid argument supplied for foreach() in /data/phpspider/zhask/libs/tag.function.php on line 1116

Notice: Undefined index: in /data/phpspider/zhask/libs/function.php on line 180

Warning: array_chunk() expects parameter 1 to be array, null given in /data/phpspider/zhask/libs/function.php on line 181

Warning: file_get_contents(/data/phpspider/zhask/data//catemap/3/reactjs/27.json): failed to open stream: No such file or directory in /data/phpspider/zhask/libs/function.php on line 167

Warning: Invalid argument supplied for foreach() in /data/phpspider/zhask/libs/tag.function.php on line 1116

Notice: Undefined index: in /data/phpspider/zhask/libs/function.php on line 180

Warning: array_chunk() expects parameter 1 to be array, null given in /data/phpspider/zhask/libs/function.php on line 181

Warning: file_get_contents(/data/phpspider/zhask/data//catemap/5/url/2.json): failed to open stream: No such file or directory in /data/phpspider/zhask/libs/function.php on line 167

Warning: Invalid argument supplied for foreach() in /data/phpspider/zhask/libs/tag.function.php on line 1116

Notice: Undefined index: in /data/phpspider/zhask/libs/function.php on line 180

Warning: array_chunk() expects parameter 1 to be array, null given in /data/phpspider/zhask/libs/function.php on line 181
Javascript 我如何循环浏览一个on react列表?_Javascript_Reactjs_React Redux - Fatal编程技术网

Javascript 我如何循环浏览一个on react列表?

Javascript 我如何循环浏览一个on react列表?,javascript,reactjs,react-redux,Javascript,Reactjs,React Redux,我已经尝试了所有的方法,无论什么原因,我都无法返回列表中的当前项。当我做控制台日志时,它会显示其中有一个属性,但它不会呈现。我做错了什么 这是我从父组件获取的数据: [ { id: 3, sku: "3008_Brown", parent_sku: "3008", name: "Leonardo", description: "Frame with light & thin Rx lenses, UV

我已经尝试了所有的方法,无论什么原因,我都无法返回列表中的当前项。当我做控制台日志时,它会显示其中有一个属性,但它不会呈现。我做错了什么

这是我从父组件获取的数据:

[
    {
        id: 3,
        sku: "3008_Brown",
        parent_sku: "3008",
        name: "Leonardo",
        description: "Frame with light & thin Rx lenses, UV & Scratch coatings, and polished edges",
        product_type_id: 1,
        gender_id: 3,
        kids: 0,
        price: "49.00",
        retail_price: "200.00",
        is_active: 1,
        mfr: "CAC",
        mfr_model: null,
        mfr_color: "GREEN",
        meas_a: 55,
        meas_b: null,
        meas_dbl: 17,
        temple_length: 140,
        total_frame_width: 142,
        spring_hinge: null,
        has_progressive: 0,
        created_at: null,
        updated_at: null
    }
]
代码如下:

class Result extends Component {
  constructor(props) {
    super(props);

    // set initial state
    this.state = {
        datas: '',
      users: [
                       {name: "John", id: 120, age: 22, gender: "male"},
                       {name: "Beth", id: 443, age: 24, gender: "female"},
                       {name: "Jane", id: 510, age: 19, gender: "female"}
                  ]
    };

    // binding 'this' to class
    this.displayList = this
      .displayList
      .bind(this);
  }

  // events we want to happen before it comes up
  componentWillMount(){
  }
  // events after load
  componentDidMount(){

  }

  displayList() {
      if (this.props.dataresults.length > 0) {
          this.props.dataresults.map(function(user, i){
              console.log('user');
              console.log(user.description);
             return <li key={i}>{user.description}</li>;
         })
     }  else {
         return (<h1>No Results </h1>)
     }
  }

  render() {
      console.log(this.state.users);
    return (
      <div class="search-results">
        <ul>


               {this.displayList()}
        </ul>
      </div>
    );
  }
}
类结果扩展组件{
建造师(道具){
超级(道具);
//设置初始状态
此.state={
数据:“”,
用户:[
{姓名:“约翰”,身份证号码:120,年龄:22,性别:“男”},
{姓名:“贝丝”,身份证号码:443,年龄:24,性别:“女性”},
{姓名:“简”,身份证号码:510,年龄:19岁,性别:“女”}
]
};
//将“this”绑定到类
this.displayList=this
.显示列表
.约束(本);
}
//我们希望在它出现之前发生的事件
组件willmount(){
}
//加载后的事件
componentDidMount(){
}
显示列表(){
if(this.props.dataresults.length>0){
this.props.dataresults.map(函数(用户,i){
console.log('user');
console.log(用户描述);
返回
  • {user.description}
  • ; }) }否则{ 返回(无结果) } } render(){ console.log(this.state.users); 返回(
      {this.displayList()}
    ); } }
    您需要返回地图的结果

      displayList() {
          if (this.props.dataresults.length > 0) {
              return this.props.dataresults.map(function(user, i){
                  console.log('user');
                  console.log(user.description);
                 return <li key={i}>{user.description}</li>;
             })
         }  else {
             return (<h1>No Results </h1>)
         }
      }
    
    displayList(){
    if(this.props.dataresults.length>0){
    返回this.props.dataresults.map(函数(用户,i){
    console.log('user');
    console.log(用户描述);
    返回
  • {user.description}
  • ; }) }否则{ 返回(无结果) } }
    正如我在评论中提到的,您需要返回结果

    displayList() {
        if (this.props.dataresults.length > 0) {
             return this.props.dataresults.map(function(user, i){
                   console.log('user');
                   console.log(user.description);
                   return <li key={i}>{user.description}</li>;
              })
         } else {
             return (<h1>No Results </h1>)
         }
    }
    
    displayList(){
    if(this.props.dataresults.length>0){
    返回this.props.dataresults.map(函数(用户,i){
    console.log('user');
    console.log(用户描述);
    返回
  • {user.description}
  • ; }) }否则{ 返回(无结果) } }
    您忘记返回了<代码>返回this.props.dataresults.map(作为旁注,
    bind
    ing
    this.displayList
    在构造函数中是不必要的。这只在传递函数时才需要,如果没有
    this
    @HardikModha调用它,请将此添加为您的答案。请注意,错误与React无关。如果您的函数n不返回任何内容,无法显示任何内容。@hardikModha谢谢您将其添加为您的答案,以便我可以给您评分