如果 obj，则按属性过滤 JSON 结果。 React.js 的属性为真

Question

我试图用 React.js 和钩子来检索和过滤 JSON 数据，但我无法找到任何好的方法来做到这一点。 刚才我在本地有我的 JSON 数据，所以它不是来自 restAPI 或类似的（目前）......我试图创建一个带有按钮的菜单，当我点击它们时，我会得到过滤的数据。 我知道......这样做应该不是很困难（因为我已经以一种非常基本的方式为条件做了它，根据某些属性是否为真显示不同的图标。）但无论如何我都在努力解决它。

这是我的代码：

import React, {setState, useState} from 'react';

export const ByCourse = () => {
const projects = window.projects.aaData;
console.log('window.projects = ', projects);

return (
<div className="section-component">
  <h2 className="mt-2 mb-4">By Course</h2>

  <ul className="nav nav-tabs">
    <li className="nav-item">
      <a className="nav-link active" href="#">
        All
      </a>
    </li>
    <li className="nav-item">
      <a className="nav-link" href="#">
        Favorite
      </a>
    </li>
    <li className="nav-item">
      <a className="nav-link" href="#">
        Recent
      </a>
    </li>
    <li className="nav-item">
      <a className="nav-link" href="#">
        Assigned
      </a>
    </li>
  </ul>


  <div className="container">

    {projects.map(project => {

      return(
        <div className="row">
          <div className="w-100">
            <div className="d-flex border mt-1 mb-1 p-3">
              <div className="col-1">
                {project.favorite ? <i className="fa fa-star"></i> : <i className="fa fa-star-o"></i>}
              </div>
              <div className="col-11">
                <div className="font-weight-bold"> {project.projectTitle}</div>
                <div className="font-weight-normal"> {project.ouName}</div>
              </div>
            </div>
          </div>
        </div>

      )})}

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

我的数据如下所示：

 projects = {"aaData":
 [
 {
   "index":0,
   "projectTitle":"123",
   "userTitle":"VVS-teknik grund",
   "ouName":"fertest1",
   "orgUnitId":1022,
   "projectId":2014,
   "favorite":false,
   "recent":false,
   "userAssigned":false,
   "projectStatus":"ACTIVE",
   "viewLink":"http://xxxxxx
 },
 {
   "index":1,
   "projectTitle":"AAA",
   "userTitle":"AAA",
   "ouName":"fertest1",
   "orgUnitId":1022,
   "projectId":2002,
   "favorite":false,
   "recent":true,
   "userAssigned":false,
   "projectStatus":"ACTIVE",
   "viewLink":"http://xxxxxx
 },
 {
   "index":2,
   "projectTitle":"Activity with image and text",
   "userTitle":"asdas",
   "ouName":"ferfer AB",
   "orgUnitId":1004,
   "projectId":1892,
   "favorite":false,
   "recent":false,
   "userAssigned":true,
   "projectStatus":"NEW",
   "viewLink":"http://xxxxxx"
}]

我尝试使用这里的解决方案： 按类别过滤 JSON 结果 - React Hooks但我收到 WEBPACK_1 错误并且无法修复它...

我也在这里做了一个非常基本的过滤：

{project.favorite ? <i className="fa fa-star"></i> : <i className="fa fa-star-o"></i>}

基本上我要找的是：

如果属性“favorite”为真 -> 显示带有 attr 最喜欢的结果为真否则如果属性“最近”为真 -> 只显示带有属性最近的结果 == 真 非常感谢您，任何帮助将非常受欢迎。

Answer 1

首先，过滤或那些功能与 React.js 无关。 它是关于 JavaScript 的。

我会尽量去说实话，我不了解你的问题。 你能只写你的问题吗？

注意：不要混合使用条件关键字或类似的东西。 如果您把问题写清楚，我们将 (i) 帮助您。 奖励：我重构了你的代码。

此处更改列表： 1- 我删除了不必要的导入 2- 分离您的代码。 制作组件。 3- 缩进 4- 短条件（修复重复代码）

import React from 'react';

const Project = data => (
  <div className="row">
    <div className="w-100">
      <div className="d-flex border mt-1 mb-1 p-3">
        <div className="col-1">
          <i className={data.favorite ? "fa fa-star" : "fa fa-star-o"} />
        </div>
        <div className="col-11">
          <div className="font-weight-bold"> {data.projectTitle}</div>
          <div className="font-weight-normal"> {data.ouName}</div>
        </div>
      </div>
    </div>
  </div>
);

export const ByCourse = () => {
  const projects = window.projects.aaData;
  console.log('window.projects = ', projects);

  return (
    <div className="section-component">
      <h2 className="mt-2 mb-4">By Course</h2>

      <ul className="nav nav-tabs">
        <li className="nav-item">
          <a className="nav-link active" href="#">
            All
          </a>
        </li>
        <li className="nav-item">
          <a className="nav-link" href="#">
            Favorite
          </a>
        </li>
        <li className="nav-item">
          <a className="nav-link" href="#">
            Recent
          </a>
        </li>
        <li className="nav-item">
          <a className="nav-link" href="#">
            Assigned
          </a>
        </li>
      </ul>

      <div className="container">
        {projects.map(project => <Project data={project} />)}
      </div>
    </div>
  );
};

Answer 2

这是一个使用useState设置过滤器的工作示例：

https://codesandbox.io/s/crazy-turing-jd3ym?fontsize=14&hidenavigation=1&theme=dark

Answer 3

我假设您想显示favorite OR recent: true的对象favorite OR recent: true ，

1) 一个简单的方法是：

 let projects = { "aaData": [{ "index": 0, "projectTitle": "123", "userTitle": "VVS-teknik grund", "ouName": "fertest1", "orgUnitId": 1022, "projectId": 2014, "favorite": true, "recent": false, "userAssigned": false, "projectStatus": "ACTIVE", "viewLink": "http://xxxxxx" }, { "index": 1, "projectTitle": "AAA", "userTitle": "AAA", "ouName": "fertest1", "orgUnitId": 1022, "projectId": 2002, "favorite": false, "recent": true, "userAssigned": false, "projectStatus": "ACTIVE", "viewLink": "http://xxxxxx" }, { "index": 2, "projectTitle": "Activity with image and text", "userTitle": "asdas", "ouName": "ferfer AB", "orgUnitId": 1004, "projectId": 1892, "favorite": false, "recent": false, "userAssigned": true, "projectStatus": "NEW", "viewLink": "http://xxxxxx" } ] } for (let iterator = 0; iterator < projects.aaData.length; iterator++) { if (projects.aaData[iterator].favorite || projects.aaData[iterator].recent) { console.log(projects.aaData[iterator]) } else { continue; } }

2）其他方法是：

 let projects = { "aaData": [{ "index": 0, "projectTitle": "123", "userTitle": "VVS-teknik grund", "ouName": "fertest1", "orgUnitId": 1022, "projectId": 2014, "favorite": true, "recent": false, "userAssigned": false, "projectStatus": "ACTIVE", "viewLink": "http://xxxxxx" }, { "index": 1, "projectTitle": "AAA", "userTitle": "AAA", "ouName": "fertest1", "orgUnitId": 1022, "projectId": 2002, "favorite": false, "recent": true, "userAssigned": false, "projectStatus": "ACTIVE", "viewLink": "http://xxxxxx" }, { "index": 2, "projectTitle": "Activity with image and text", "userTitle": "asdas", "ouName": "ferfer AB", "orgUnitId": 1004, "projectId": 1892, "favorite": false, "recent": false, "userAssigned": true, "projectStatus": "NEW", "viewLink": "http://xxxxxx" } ] } let filteredArrayWithNull = projects.aaData.filter((object) => { return object.favorite || object.recent ? object : null }) let finalFilteredArray = filteredArrayWithNull.filter((object) => object!=null) console.log(finalFilteredArray);

阅读更多关于filter() ； 这是一份综合指南