如何在Reactjs中使用Array.map格式化和显示JSON数据? [英] How to format and display JSON data using Array.map in Reactjs?

问题描述

我正在尝试显示存储为 userList 状态变量的数据.我正在尝试对每个对象进行 map 映射，并显示每个对象的 name 和 email 参数，但是在网页上我什么都看不到使用 console.log()进行数据处理.我正在使用 displayUsers()显示用户，并使用 getAllUser()从API端点获取数据.我认为我的 displayUsers()函数是错误的.代码:

I am trying to display data which is stored as userList state variable. I am trying to map each object and display name and email parameter from each object but it does not display anything on web page I can only see the data using console.log(). I am displaying Users using displayUsers() and getting data from API endpoint using getAllUser(). I think my displayUsers() function is wrong. Code:

import React, { Component } from 'react';
import axios, { post } from 'axios';

class App extends Component {

  constructor(props){
    super(props);
    this.state = {
          userList:[]
    }
  }

  ComponentDidMount(){
        if(window.sessionStorage.getItem("ud") !== null){
            var _userData = JSON.parse(window.sessionStorage.getItem("ud"));
            this.userDetails = _userData;
        }
        this.getAllUser();
  }

  getAllUser(){
        axios({
            method:"GET",
            url:"http://62.210.93.54:6010/api/getAllUser",
            auth:{
                username:this.userDetails.email,
                password:this.userDetails.password
            }
        }).then((response)=>{
            console.log(response.data);
            this.setState({
                userList:response.data.results
            })    
        })
  }

  displayUsers(){
        return this.state.userList.map( user => {
          return(
            <div className="item-card">
               <div className="info">    
                    <div className="username">Username: {user.name}</div>
               </div>
            <div className="del-wrap">
                <img src={require("../../images/cancel.svg")}/>
            </div>
            </div>
            );
        })
  }

  render() {
        return(
          <div className="users-wrap">
                <h1>Users</h1>
                <div className="task-content">
                    <div className="user-wrap">
                        <div className="users">
                            <div className="item-card add">
                                    <img src={require("../../images/plus.svg")} className="plus-icon" />
                                    <div className="lbl">Add a new User</div>
                             </div>

                             {this.displayUsers()}

                        </div>
                    </div>
                </div> 
          </div>
        );
    }
}

export default App;

模型架构:

   {
  "results": [
    {
      "createdBy": null,
      "updatedBy": "Ankit",
      "createdDate": 1523892363509,
      "updatedDate": 1524066767311,
      "id": "5ad4c1964417fc66067b29cf",
      "userName": "admin",
      "email": "[e-mail]",
      "roles": [
        "USER"
      ]
    },
    {
      "createdBy": null,
      "updatedBy": null,
      "createdDate": 1523971940177,
      "updatedDate": 1523971940177,
      "id": "5ad5f7640ff4ec580b885a2e",
      "userName": "varun",
      "email": "[e-mail]",
      "roles": [
        "ADMIN"
      ]
    },
    {
      "createdBy": null,
      "updatedBy": null,
      "createdDate": 1524302563169,
      "updatedDate": 1524302563169,
      "id": "5adb02e30ff4ec53076ffbb7",
      "userName": "Rahul",
      "email": "[e-mail]",
      "roles": [
        "admin"
      ]
    },
    {
      "createdBy": null,
      "updatedBy": null,
      "createdDate": 1524303894654,
      "updatedDate": 1524303894654,
      "id": "5adb08160ff4ec53076ffbbb",
      "userName": "Nandita",
      "email": "[e-mail]",
      "roles": [
        "member"
      ]
    },
    {
      "createdBy": null,
      "updatedBy": null,
      "createdDate": 1524308787960,
      "updatedDate": 1524308787960,
      "id": "5adb1b330ff4ec53076ffbc2",
      "userName": "user",
      "email": "[e-mail]",
      "roles": [
        "USER"
      ]
    },
    {
      "createdBy": null,
      "updatedBy": null,
      "createdDate": 1524327504461,
      "updatedDate": 1524327504461,
      "id": "5adb64500ff4ec53076ffbc4",
      "userName": "Rinku",
      "email": "[e-mail]",
      "roles": [
        "admin"
      ]
    }
  ],
  "httpStatus": "OK",
  "message": "All Users response"
}

推荐答案

根据您的模型架构，您的用户对象包含 userName 和 not name ，因此您可以在 displayUsers 方法中写入 user.userName ，而且密钥参数对性能优化很有帮助，您应该在由以下代码返回的元素上添加唯一的密钥迭代器

As per your model schema, your user object contains userName and not name, so you would write user.userName in your displayUsers method, Also a key param is helpful in performance optimisation and you should add a unique key on the element returned by the iterator

 displayUsers(){
        return this.state.userList.map( user => {
          return(
            <div className="item-card" key={user.id}>
               <div className="info">    
                    <div className="username">Username: {user.userName}</div>
               </div>
            <div className="del-wrap">
                <img src={require("../../images/cancel.svg")}/>
            </div>
            </div>
            );
        })
  } 

这篇关于如何在Reactjs中使用Array.map格式化和显示JSON数据?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！