如何扩展多张卡片以响应状态？

Question

我有一张卡片清单。单击每张卡片后，我希望它们能够扩展更多信息。我从服务器获取卡片并映射它们。为了扩展单张卡，而不是多张卡，我创建了一个状态 editIndex，它检查卡的 ID，以便它可以正常工作并专门扩展该卡。我想不通，如何同时扩展一张卡和另一张卡。因为现在如果我点击卡片，另一张展开的卡片正在折叠。

  const [studentList, setStudentList] = useState();
  const [input, setInput] = useState(" ");
  const [editIndex, setEditIndex] = useState(null);
  const [suggestions, setSuggestions] = useState(null);


 const handleExpand = (id) => {
 setEditIndex((e) => (e === id ? null : id))};
 
return (
<div
  className="flex
  flex-col 
  w-4/5
  h-[800px]
  overflow-scroll
  scrollbar-hide
  border 
  bg-white 
  rounded-xl
  "
>
  <div>
    {studentList?.map(
      ({
        city,
        company,
        email,
        firstName,
        grades,
        id,
        lastName,
        pic,
        skill,
      }) => (
        <div
          key={uuidv4()}
          onClick={(e) => handleExpand(id)}
          className="flex  border-b-2 py-2 px-7 xl:px-12 cursor-pointer
            mb-2 max-h-96 transition transform ease duration-200;
            "
        >
          <div className="flex items-center ">
            <img
              src={pic}
              className="flex items-center border rounded-full object-cover w-  [100px] h-[100px]"
            />
          </div>
          <div className="ml-10 superTest ">
            <p className="font-bold text-4xl">
              {firstName} {lastName}
            </p>
            <p>E-mail: {email}</p>
            <p>Company: {company}</p>
            <p>Skill: {skill}</p>
            <p>Average: {grades}% </p>

            {editIndex === id && (
              <div>
                <p>1</p>
                <p>2</p>
                <p>3</p>
                <p>4</p>
                <p>5</p>
              </div>
            )}
          </div>
        </div>
      )
    )}
  </div>
</div>
  );
    }

 export default Card;

Answer 1

而不是 editIndex，有 Set 个扩展卡的 id 个值：

const [editing, setEditing] = useState(new Set());

然后，给expand/contract一张牌（可惜Set没有built-intoggle方法）：

const handleExpand = (id) => {
    setEditing(editing => {
        // Copy the set
        editing = new Set(editing);
        if (editing.has(id)) {
            // Already editing, stop editing
            editing.delete(id);
        } else {
            // Not editing, start
            editing.add(id);
        }
        return editing;
    });
};

判断一张卡片是否展开，是editing.has(id):

{editing.has(id) && (
  <div>
    <p>1</p>
    <p>2</p>
    <p>3</p>
    <p>4</p>
    <p>5</p>
  </div>
)}

Answer 2

尝试使用扩展卡片的数组或映射：

const [editIndex, setEditIndex] = useState([]);
...
const handleExpand = (id) => {
  setEditIndex((e) => (e.includes(id) ? e.filter(i => i !== id) : [...e, id]))
};
...
{editIndex.includes(id) && (
          <div>
            <p>1</p>
            <p>2</p>
            <p>3</p>
            <p>4</p>
            <p>5</p>
          </div>
)}

Answer 3

您应该声明一个对象，并在对象中保留扩展的卡片 ID。使用对象而不是数组可以避免循环过滤数组

  import React, { useState } from 'react';
  
  function Card() {
    const [studentList, setStudentList] = useState();
    const [editIndex, setEditIndex] = useState({});

    const handleExpand = (id) => {
        setEditIndex((e) => (e === id ? null : id))
        setEditIndex({id: !editIndex[id]});
    };

    return studentList.map((student, index) => 
        <div onClick={() => handleExpand(index)} className={`otherClassNames ${editIndex[index]?"expanded":"collapsed"}`}>
            {JSON.stringify(student)} // render student data
        </div>
        );
  }
  
  export default Card;

另一方面，你可以使用Ant Design库的Collapse组件。所以把崩溃问题留给他们。

https://ant.design/components/collapse/

库中还有其他复杂的组件，使用时请查看。

如何扩展多张卡片以响应状态？

How do I expand multiple cards in react with state?

javascript

reactjs

tailwind-css

react-hooks