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js实现progress-steps（小练习）

作者：互联网

使用javascript实现一个progress-steps巩固自己的基础知识。
在这里插入图片描述⭐️index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Progress Steps</title>
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <div class="container">
    
    <div class="progress-container">
      <div class="progress" id="progress"></div>
      <div class="circle active">1</div>
      <div class="circle">2</div>
      <div class="circle">3</div>
      <div class="circle">4</div>
    </div>

    <button class="btn" id="prev" disabled>Prev</button>
    <button class="btn" id="next">Next</button>
  </div>

  <script src="script.js"></script>
</body>
</html>

⭐️布局基本使用flex布局，也用到了定位

/* 导入字体样式 */
@import url(https://fonts.googleapis.com/css?family=Muli&display=swap);

/* 定义css变量 */
:root {
  --line-border-fill: #3498db;
  --line-border-empty: #e0e0e0;
}

* {
  box-sizing: border-box;
}

body {
  background-color: #f6f7fb;
  font-family: 'Muli',sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

.container {
  /* 文字居中 */
  text-align: center;
}

/* 文字 + 进度条部分 */
.progress-container {
  display: flex;
  justify-content: space-between;

  /* 调整文字与按钮的距离 */
  margin-bottom: 30px;
  max-width: 100%;
  width: 350px;

  /* 子绝父相 */
  position: relative;
}

/* 进度条的直线 */
.progress-container::before {
  content: '';
  background-color: var(--line-border-empty);
  position: absolute;
  top: 50%;
  left: 0;
  /* y轴移动50% 放在文字中间 */
  transform: translateY(-50%);
  height: 4px;
  width: 100%;
  /* 仅在有定位的元素上生效 z-index:-1; 进度条在文字后面 */
  z-index: -1;
}

/* 点击事件写完后 点击width增大 或减小 */
.progress {
  background-color: var(--line-border-fill);
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  height: 4px;
  width: 0%;
  z-index: -1;
  /* 进度条过渡变颜色的时间 */
  transition: .4s ease;
}

/* 数字 */
.circle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 3px solid var(--line-border-empty);
  background-color: #fff;
  color: #999;
  /* 数字外的边框 变成蓝色的过渡时间 */
  transition: .4s ease;
}

.circle.active {
  border-color: var(--line-border-fill);
}

/* 按钮 */
.btn {
  background-color: var(--line-border-fill);
  color: #fff;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
  padding: 8px 30px;
  margin: 5px;
  font-size: 14px;
}

/* 点击时鼠标发生缩放 数值越小 观察越明显 */
.btn:active {
  transform: scale(0.98);
}


.btn:disabled {
  background-color: var(--line-border-empty);
  cursor: not-allowed;
}

⭐️javascript部分

const progress = document.getElementById('progress')
const prev = document.getElementById('prev')
const next = document.getElementById('next')
const circles = document.querySelectorAll('.circle')

let currentActive = 1
next.addEventListener('click',() => {
  currentActive++

  if(currentActive > circles.length) {
    currentActive = circles.length
  }

  update()
})

prev.addEventListener('click',() => {
  currentActive--

  if(currentActive < 1) {
    currentActive = 1
  }

  update()
})

function update() {
  circles.forEach((circle,index) => {
    if(index < currentActive) {
      circle.classList.add('active')
    }else {
      circle.classList.remove('active')
    }
  })

  // 选中变蓝的圆圈 然后让进度条前进或者后退
  const actives = document.querySelectorAll('.active')
  progress.style.width = (actives.length - 1) / (circles.length - 1) * 100 + '%'

  if(currentActive === 1) {
    prev.disabled = true
  } else if(currentActive === circles.length) {
    next.disabled = true
  }else {
    prev.disabled = false
    next.disabled = false
  }
}

这个案例是在github看到的50个javascript项目
链接地址：50个javascript小项目

标签：--,js,color,steps,currentActive,progress,line,border
来源： https://blog.csdn.net/weixin_45732235/article/details/123616302