如果 obj，则按属性过滤 JSON 结果。 React.js 的属性为真

Question

Im trying to retrieve and filter JSON data with React.js and maybe hooks but I cant come with any good way to do it. Just now I have my JSON data local, so it does not come from restAPI or similar (for now)... and what Im trying is to create a menu with buttons that when I click on them I get filtered data. I know... it should not be very difficut to do it (cause Im doing it already in a veeeery basic way for a conditional that show different icones depending on if certain attribute is true.) but anyway im struggling with it.

Here is my code:

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>
);};

and my data looks like this:

 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"
}]

I tried using a solution from here: Filtering JSON results in categories - React Hooks but I get a WEBPACK_1 ERROR and cant fix it...

Im also doing a very basic filtering here:

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

and basically what Im looking for is:

if attribute "favorite" is true -> show results with attr favorite true else if attribute "recent" is true -> just show results with attribute recent == true Thank you very much in advance, any help will be very very welcome.

Answer 1

First of all, the filtering or those functions is not about React.js. It's about JavaScript.

I will try go to be honest, i don't undestand anything about your problem. Could you please write only your problem?

Note: Don't mix the conditional keyword or something like that. If you write the problem clearly we will (i) will help you. Bonus: I refactor your code.

Here changes list: 1- I removed the unnecessary import 2- Seperate your code. Make component. 3- Indentation 4- Short condition (Fix for duplicate code)

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

Here's a working example using useState to set a filter:

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

Answer 3

I am assuming you want to show the objects where favorite OR recent: true ,

1) A simple way to do this is:

 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) Other way to do this is:

 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);

To read more about filter() ; here is a comprehensive guide