React TSX点击触发动画及按钮控制动画进度的实现方案咨询

一、点击div启动动画并保持最终位置 #

修改思路 #

将动画从默认伪元素样式中剥离，通过添加类名触发动画；利用React状态管理类名切换，实现点击触发效果。forwards属性会让动画结束后停留在最终帧状态。

修改后代码 #

.tsx文件

import { useState } from 'react';
import styles from "./WaterTracker.module.css";

export default function WaterTracker() {
  const [isAnimating, setIsAnimating] = useState(false);

  const handleClick = () => {
    setIsAnimating(true);
  };

  return (
    <div className={styles.mainContainer}>
      <div className={styles.wrapper}>
        <div 
          className={`${styles.mainContent} ${isAnimating ? styles.active : ''}`}
          onClick={handleClick}
        ></div>
      </div>
    </div>
  );
}

.css文件

:root {
    --background: #f8f8f8;
    --dark: #303032;
}

.mainContainer {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.wrapper {
    background: var(--background);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.mainContent {
    position: relative;
    background: var(--dark);
    border: 0.25em solid var(--dark);
    height:8rem;
    width: 8rem;
    outline: 0.25;
    overflow: hidden;
    cursor: pointer;
}

.mainContent::before {
    content: "Drink je water";
    font-size: 2rem;
    color: white;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.mainContent::after {
    content: "";
    position: absolute;
    background: var(--background);
    height: 200%;
    width: 200%;
    bottom: -50%;
    left: -50%;
    border-radius: 45%;
}

.mainContent.active::after {
    animation: spin 6s ease-in-out forwards;
}

@keyframes spin {
    0% {
        transform: translateY(0) rotate(0deg);
    }
    100% {
        transform: translateY(-100%) rotate(500deg);
    }
}

二、按钮控制动画的translateY分步进度 #

修改思路 #

使用CSS变量动态控制动画的最终translateY值，结合React状态管理当前进度；通过按钮点击更新目标值，并通过“移除再添加动画类”的方式强制动画重新执行。

修改后代码 #

.tsx文件

import { useState, useRef } from 'react';
import styles from "./WaterTracker.module.css";

export default function WaterTracker() {
  const [progress, setProgress] = useState(0); // 0:初始, 1:到-50%, 2:到-100%
  const contentRef = useRef<HTMLDivElement>(null);

  const getTargetY = () => {
    switch(progress) {
      case 1: return "-50%";
      case 2: return "-100%";
      default: return "0";
    }
  };

  const handleNextStep = () => {
    if (progress >= 2) return;
    // 强制重绘后重新触发动画
    if (contentRef.current) {
      contentRef.current.classList.remove(styles.active);
      void contentRef.current.offsetWidth;
      contentRef.current.classList.add(styles.active);
    }
    setProgress(prev => prev + 1);
  };

  return (
    <div className={styles.mainContainer}>
      <div className={styles.wrapper}>
        <div 
          ref={contentRef}
          className={styles.mainContent}
          style={{
            "--target-y": getTargetY(),
            "--current-y": progress === 0 ? "0" : progress === 1 ? "-50%" : "-100%"
          } as React.CSSProperties}
        ></div>
        <button onClick={handleNextStep} className={styles.controlBtn}>
          {progress === 0 ? "开始填充" : progress === 1 ? "继续填充" : "已完成"}
        </button>
      </div>
    </div>
  );
}

.css文件

:root {
    --background: #f8f8f8;
    --dark: #303032;
}

.mainContainer {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.wrapper {
    background: var(--background);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
}

.mainContent {
    position: relative;
    background: var(--dark);
    border: 0.25em solid var(--dark);
    height:8rem;
    width: 8rem;
    outline: 0.25;
    overflow: hidden;
}

.mainContent::before {
    content: "Drink je water";
    font-size: 2rem;
    color: white;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.mainContent::after {
    content: "";
    position: absolute;
    background: var(--background);
    height: 200%;
    width: 200%;
    bottom: -50%;
    left: -50%;
    border-radius: 45%;
}

.mainContent.active::after {
    animation: spin 6s ease-in-out forwards;
}

@keyframes spin {
    0% {
        transform: translateY(var(--current-y, 0)) rotate(0deg);
    }
    100% {
        transform: translateY(var(--target-y, -100%)) rotate(500deg);
    }
}

.controlBtn {
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    border: none;
    border-radius: 4px;
    background: var(--dark);
    color: white;
    cursor: pointer;
}

内容的提问来源于stack exchange，提问作者Luuk van Dijk