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drag and drop react 예제    
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<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>CDN을 이용한 리엑트 드래그 앤 드롭 예제</title>
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <h2 class="title">리엑트 드래그 앤 드롭</h2>

    <!-- We will put our React component inside this div. -->
    <div id="root"></div>

    <!-- 리엑트 로드. -->
    <!-- 노트: 배포할 때는 "development.js" 를 "production.min.js"로 변경해야 합니다. -->
    <script
      src="https://unpkg.com/react@18/umd/react.development.js"
      crossorigin
    ></script>
    <script
      src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"
      crossorigin
    ></script>
    <script src=" https://unpkg.com/@babel/standalone/babel.min.js"></script>

    <!-- 바벨을 이용하여 JSX 사용. -->
    <script type="text/babel">
      const questions = [
        { id: 1, name: "jiwon", order: 0 },
        { id: 2, name: "jisoo", order: 1 },
        { id: 3, name: "yeeun", order: 2 },
      ];

      function array_move(arr, old_index, new_index) {
        // 참고: https://stackoverflow.com/a/5306832
        if (new_index >= arr.length) {
          var k = new_index - arr.length + 1;
          while (k--) {
            arr.push(undefined);
          }
        }
        arr.splice(new_index, 0, arr.splice(old_index, 1)[0]);
        return arr; // for testing
      }

      function DragAndDropContainer({ contents }) {
        const [items, setItems] = React.useState(contents);
        const currentItem = React.useRef(null);
        const [currentItemId, setCurrentItemId] = React.useState(null);

        const onDragStart = (e) => {
          currentItem.current = e.currentTarget;
          const { id } = e.currentTarget;
          const index = items.findIndex((item) => item.id === Number(id));
          console.log(id, "drag start, ", "start index: ", index);
          setCurrentItemId(Number(id));
        };

        const onDrop = (e) => {
          e.preventDefault();
          // const { id } = e.target;
          const { id } = e.currentTarget;
          const currentItemIndex = items.findIndex(
            (item) => item.id === Number(currentItem.current.id)
          );
          const dropIndex = items.findIndex((item) => item.id === Number(id));
          console.log(
            id,
            "drop, ",
            "current item:",
            currentItem.current.id,
            ", drop index:",
            dropIndex,
            ", currentItem index:",
            currentItemIndex
          );

          const newArray = array_move(items, currentItemIndex, dropIndex);
          newArray.forEach((item, index) => {
            item.order = index;
          });
          console.log("new array=", newArray);
          setItems([...newArray]);
        };

        return items.map((item) => (
          <DraggableItem
            key={item.id}
            currentItemId={currentItemId}
            item={item}
            onDragStart={onDragStart}
            onDrop={onDrop}
          >
            <Question question={item} />
          </DraggableItem>
        ));
      }

      function DraggableItem({
        children,
        currentItemId,
        item,
        onDragStart,
        onDrop,
      }) {
        console.log("current item id:", currentItemId);
        let counter = 0;

        const handleDragStart = (e) => {
          const { id } = e.target;
          console.log(id, "drag start");
          onDragStart(e);
        };

        const handleDragEnter = (e) => {
          const { id } = e.currentTarget;
          console.log(id, "drag enter");
          counter++;
          console.log("counter:", counter);
          if (currentItemId !== Number(id)) {
            e.currentTarget.classList.add("active");
          }
        };

        const handleDragLeave = (e) => {
          const { id } = e.currentTarget;
          console.log(id, "drag leave");
          counter--;
          console.log("counter:", counter);
          if (counter == 0) {
            console.log("counter in handle drag leave", counter);
            e.currentTarget.classList.remove("active");
          }
        };

        const handleDragEnd = (e) => {
          const { id } = e.currentTarget;
          console.log(id, "drag end");
          e.currentTarget.classList.remove("active");
          e.currentTarget.classList.remove("hint");
        };

        const handleDragOver = (e) => {
          e.preventDefault();
          const { id } = e.target;
          console.log(id, "drag over");
        };

        const handleDrop = (e) => {
          e.preventDefault();
          const { id } = e.target;
          console.log(id, "drop");
          onDrop(e);
          e.currentTarget.classList.remove("active");
          e.currentTarget.classList.remove("hint");
        };

        return (
          <div
            draggable={true}
            className={`draggable-item`}
            onDragStart={handleDragStart}
            onDragEnter={handleDragEnter}
            onDragLeave={handleDragLeave}
            onDragEnd={handleDragEnd}
            onDragOver={handleDragOver}
            onDrop={(e) => handleDrop(e)}
            id={item.id}
          >
            {children}
          </div>
        );
      }

      function Question({ question }) {
        return (
          <div
            draggable={false}
            className="question"
            onDragStart={(e) => {
              e.preventDefault();
              e.stopPropagation();
            }}
          >
            <h3>질문</h3>
            <p>이름: {question.name}</p>
            <input
              type="text"
              draggable={true}
              onDragStart={(event) => event.preventDefault()}
            />
          </div>
        );
      }

      function QuestionsList({ questions }) {
        return questions.map((question) => (
          <Question key={question.id} question={question} />
        ));
      }

      function Main() {
        return (
          <div>
            <DragAndDropContainer contents={questions} />
          </div>
        );
      }

      const domContainer = document.querySelector("#root");
      const root = ReactDOM.createRoot(domContainer);
      root.render(<Main />);
    </script>
  </body>
</html>