[英]create an expand content or show more content button in react app
So i am trying to basically add a expand button to my react app that will reveal more information and i would prefer that the app expand the div size to reveal the additional content, so the its basically an expand button, i understand i need to utilize the usestate property and a function however i am having a hard time figuring out how do i update the css of the student div to expand and reveal the added information.所以我试图在我的反应应用程序中添加一个扩展按钮来显示更多信息,我希望应用程序扩展 div 大小以显示附加内容,所以它基本上是一个扩展按钮,我知道我需要利用usestate 属性和一个函数,但是我很难弄清楚如何更新学生 div 的 css 以展开和显示添加的信息。 The added information is the grades portion (FYI).添加的信息是成绩部分(仅供参考)。
UPDATE: I have found a way to display the changes the problem i am facing is to get the state to start as isExpanded false so when a user clicks the plus button it expands to reveal the class hidden information again更新:我找到了一种显示更改的方法,我面临的问题是让状态以 isExpanded false 开始,因此当用户单击加号按钮时,它会展开以再次显示类隐藏信息
here is my App.js file这是我的 App.js 文件
import React, { useState } from "react";
import "./App.css";
export default function App() {
const [students, setStudents] = useState(null);
const [filterData, setFilterData ] = useState(null);
const [isExpanded, setIsExpanded] = useState(false);
const studentdata = 'https://www.hatchways.io/api/assessment/students';
function getStudents(){
fetch(studentdata)
.then(resp => resp.json())
.then(data => {
setFilterData(data.students);
setStudents(data.students);
setIsExpanded(false);
})
}
const searchByName = (event) => {
event.persist();
// Get the search term
const searchItem = event.target.value.toLowerCase().trim();
// If search term is empty fill with full students data
if(!searchItem.trim()) {
setFilterData(students);
}
// Search the name and if it found retun the same array
const serachIn = (firstName, lastName) => {
if(firstName.indexOf(searchItem) !== -1 || lastName.indexOf(searchItem) !== -1) {
return true;
}
let fullName = firstName.toLowerCase()+" "+lastName.toLowerCase();
if(fullName.indexOf(searchItem) !== -1) {
return true;
}
return false;
};
// Filter the array
const filteredData = students.filter((item) => {
return serachIn(item.firstName, item.lastName);
});
// Set the state with filtered data
setFilterData(filteredData);
}
function exp() {
if(isExpanded){
setIsExpanded(true);
}
}
return (
<div className="App">
<h1>Students</h1>
<div>
<button className="fetch-button" onClick={getStudents}>
Get Students
</button>
<br />
</div>
<div className="search" id="search">
<input type="text" name="serachByName" id="searchbar" placeholder="Search by name" onChange={(e) => searchByName(e)} ></input>
</div>
{filterData && filterData.map((student, index) => {
var total = 0;
for(var i = 0; i < student.grades.length; i++) {
var grade = parseInt(student.grades[i]);
total += grade;
}
const avg = total / student.grades.length;
const average = avg.toString();
const grade1 = student.grades[0];
const grade2 = student.grades[1];
const grade3 = student.grades[2];
const grade4 = student.grades[3];
const grade5 = student.grades[4];
const grade6 = student.grades[5];
const grade7 = student.grades[6];
const grade8 = student.grades[7];
return(
<div className={'student' + isExpanded ? 'expanded' : '' } key={index}>
<div className="image">
<img src={student.pic} id="icon"></img>
</div>
<div className="text">
<h3 id="name">{student.firstName} {student.lastName}</h3>
<p id="detail"><strong>EMAIL:</strong> {student.email}</p>
<p id="detail"><strong>COMPANY:</strong> {student.company}</p>
<p id="detail"><strong>SKILL:</strong> {student.skill}</p>
<p id="detail"><strong>AVERAGE:</strong>: {average}%</p>
<p id="detail" className="hidden">
<br></br>Test 1 :{grade1}
<br></br>Test 2 :{grade2}
<br></br>Test 3 :{grade3}
<br></br>Test 4 :{grade4}
<br></br>Test 5 :{grade5}
<br></br>Test 6 :{grade6}
<br></br>Test 7 :{grade7}
<br></br>Test 8 :{grade8}
</p>
</div>
<div className="expand">
<button className="expand_btn" onClick={exp()} id="expand_btn">+</button>
</div>
</div>
)}
)}
</div>
);
}
and my css file和我的 css 文件
@import url('https://fonts.googleapis.com/css?family=Bebas+Neue&display=swap');
@import url('https://fonts.googleapis.com/css?family=Roboto:300,400&display=swap');
.root{
width: 100vw;
height: 100vh;
background-color: black;
}
.App {
text-align: center;
width: 1000px;
height: 750px;
background-color: aliceblue;
border: 4px solid black;
border-radius: 5%;
margin-top: 75px;
margin-left: auto;
margin-right: auto;
overflow: scroll;
}
.student{
width: 80%;
height: 200px;
background-color: white;
display: flex;
align-items: center;
padding-top: 3%;
padding-bottom: 3%;
border: 2px solid lightblue;
margin-left: auto;
margin-right: auto;
}
.text{
text-align: left;
padding-left: 7%;
width: 300px;
}
.image{
padding-left: 15%;
}
#icon{
border-radius: 50%;
width: 150px;
height: 150px;
border: 2px solid black;
}
#name{
text-transform: capitalize;
font-family: 'Bebas Neue';
letter-spacing: 4px;
font-size: 40px;
margin-bottom: 10px;
margin-top: 10px;
}
#detail {
font-family: 'Roboto';
font-weight: 300;
line-height: normal;
margin: 0;
}
.search {
width: 80%;
height: 20px;
margin-left: auto;
margin-right: auto;
margin-top: 10px;
margin-bottom: 20px;
}
#searchbar {
width: 100%;
height: 30px;
font-family: 'Roboto';
font-size: 18px;
font-weight: 300;
}
.expand {
width: 100px;
height: 100px;
padding-left: 3%;
margin-bottom: 5%;
}
#expand_btn {
font-family: 'Bebas Neue';
font-size: 50px;
color: lightskyblue;
background-color: transparent;
border: none;
}
.hidden {
display: none;
}
.expanded{
width: 80%;
height: 300px;
background-color: white;
display: flex;
align-items: center;
padding-top: 3%;
padding-bottom: 3%;
border: 2px solid lightblue;
margin-left: auto;
margin-right: auto;
}
I have fixed the issue in this codesandbox - https://codesandbox.io/s/purple-bird-j5vrm我已经解决了这个代码和框中的问题 - https://codesandbox.io/s/purple-bird-j5vrm
Check and let me know if this helps.检查并让我知道这是否有帮助。
There are many ways to solve your problem.有很多方法可以解决您的问题。 One way is adding isExpanded
flag to each object in the students array so that each student object would know if that is expanded or not.一种方法是向学生数组中的每个对象添加isExpanded
标志,以便每个学生对象都知道它是否被扩展。 And I have used the flag like this我用过这样的标志
className={"student " + student.isExpanded ? "expanded" : " "}
As per your implementation, isExpanded was being set globally so every student item would be set as Expanded and there was no way to know which item was expanded.根据您的实施, isExpanded 是全局设置的,因此每个学生项目都将设置为 Expanded 并且无法知道哪个项目被扩展。
Note: I have implemented only for getStudents and not filterStudents.注意:我只为 getStudents 而不是 filterStudents 实施。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.