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JS to achieve progress steps (small exercise)

2022-07-24 18:20:00 【lalaxuan】

Use javascript Achieve one progress-steps Consolidate your basic knowledge .
Insert picture description here ️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>

️ Layout basic use flex Layout , Positioning is also used 

/*  Import font styles  */
@import url(https://fonts.googleapis.com/css?family=Muli&display=swap);

/*  Definition css Variable  */
: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 {
    
  /*  Writing in the middle  */
  text-align: center;
}

/*  written words  +  Progress bar section  */
.progress-container {
    
  display: flex;
  justify-content: space-between;

  /*  Adjust the distance between the text and the button  */
  margin-bottom: 30px;
  max-width: 100%;
  width: 350px;

  /*  The son is the father  */
  position: relative;
}

/*  The straight line of the progress bar  */
.progress-container::before {
    
  content: '';
  background-color: var(--line-border-empty);
  position: absolute;
  top: 50%;
  left: 0;
  /* y Axis movement 50%  Put it in the middle of the text  */
  transform: translateY(-50%);
  height: 4px;
  width: 100%;
  /*  Effective only on elements with positioning  z-index:-1;  The progress bar is after the text  */
  z-index: -1;
}

/*  Click after the event is written   Click on width increase   Or decrease  */
.progress {
    
  background-color: var(--line-border-fill);
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  height: 4px;
  width: 0%;
  z-index: -1;
  /*  The time when the progress bar changes color  */
  transition: .4s ease;
}

/*  Numbers  */
.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;
  /*  The border outside the number   Transition time to blue  */
  transition: .4s ease;
}

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

/*  Button  */
.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;
}

/*  The mouse zooms when you click   The smaller the numerical   The more obvious observation  */
.btn:active {
    
  transform: scale(0.98);
}


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

️javascript part 

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')
    }
  })

  //  Select the blue circle   Then move the progress bar forward or backward 
  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
  }
}

This case is in github What you see 50 individual javascript project
Link address ：50 individual javascript Small projects

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