bonjour,
j'ai un probléme
je veux changer les images de slider si l'utilisateur utilise un smartphone, mais malgré que je fais beaucoup de recherche j'ai pas ou le proble dans ce code en plus il s'affiche 3 SLIDE Seulement , merci d'avance pour votre aide
Code html : Sélectionner tout - Visualiser dans une fenêtre à part
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<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      padding: 0;
      font-family: Arial, sans-serif;
    }
    
    .slider {
      width: 100%;
      height: 100vh;
      overflow: hidden;
      position: relative;
    }
    
    .slider-item {
      width: 100%;
      height: 100vh;
      display: none;
      background-position: center;
      background-repeat: no-repeat;
      background-size: cover;
      position: absolute;
      top: 0;
      left: 0;
      opacity: 0;
      transition: opacity 0.5s ease;
    }
    
    .slider-item.active {
      display: block;
      opacity: 1;
    }
    
    .slider-content {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      color: #fff;
      text-align: center;
      opacity: 0;
      transition: opacity 0.5s ease;
    }
    
    .slider-item.active .slider-content {
      opacity: 1;
    }
    
    .slider-logo {
      position: absolute;
      top: 10%;
      left: 50%;
      transform: translateX(-50%);
      width: 200px; /* Ajustez la taille du logo selon vos besoins */
      height: auto;
      z-index: 999;
      opacity: 0;
      transition: opacity 0.5s ease;
    }
    
    .slider-item.active .slider-logo {
      opacity: 1;
    }
    
    /* Media queries pour les appareils mobiles et tablettes */
    @media only screen and (max-width: 767px) {
      .slider-item {
        background-image: url('media/M1.jpg');
      }
      
      .slider-item:nth-child(2) {
        background-image: url('media/M2.jpg');
      }
      
      .slider-item:nth-child(3) {
        background-image: url('media/M3.jpg');
      }
          
    .slider-item:nth-child(4) {
      background-image: url('media/M4.jpg');
    }
 
    .slider-item:nth-child(5) {
      background-image: url('media/M5.jpg');
    }
 
    .slider-item:nth-child(6) {
      background-image: url('media/M6.jpg');
    }
    }
 
    /* Style pour le bouton au milieu bas */
    .slider-button {
      position: absolute;
          text-align : center;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      padding: 10px 20px;
      background-color: #fff;
      color: #000;
      font-size: 1.2rem;
      text-transform: uppercase;
      border-radius: 5px;
      cursor: pointer;
      transition: background-color 0.3s, color 0.3s;
    }
 
    .slider-button:hover {
      background-color: #000;
      color: #fff;
    }
  </style>
  <script src="js/slider.js"></script>
  <script src="js/language_fr.js"></script>
</head>
<body>
  <div class="slider">
    <div class="slider-item active" style="background-image: url('media/working-1.jpg');">
      <div class="slider-logo">
        <img src="media/logo-dark.svg" alt="Logo">
      </div>
      <div class="slider-content">
        <h1 id="title1">Placing Food Security<br>at The Heart of<br>Human Development.</h1>
        <p id="description1"></p>
      </div>
	  <div class="slider-button">FULL WEBSITE COMMING ON MONDAY 5 OCTOBER 2023 </div>
    </div>
    <div class="slider-item" style="background-image: url('media/stockholminitiative-cover2.jpg');">
      <div class="slider-logo">
        <img src="media/logo-dark.svg" alt="Logo">
      </div>
      <div class="slider-content">
        <h1 id="title2">Indexing Food Security<br>Integrating New Metrics</h1>
        <p id="description2">Time to Iintegate sustainability, climate change resilience,<br>gender equality, good governance, transparency</p>
      </div>
	  <div class="slider-button">FULL WEBSITE COMMING ON MONDAY 5 OCTOBER 2023 </div>
    </div>
    <div class="slider-item" style="background-image: url('media/stockholminitiative-cover3.jpg');">
      <div class="slider-logo">
        <img src="media/logo-dark.svg" alt="Logo">
      </div>
      <div class="slider-content">
        <h1 id="title3">Climate Change Challenges</h1>
        <p id="description3">Focusing on Community-based Solutions
in facing Climate Change-induced disruptions</p>
      </div>
	  <div class="slider-button">FULL WEBSITE COMMING ON MONDAY 5 OCTOBER 2023 </div>
    </div>
	<div class="slider-item" style="background-image: url('media/stockholminitiative-cover4.jpg');">
  <div class="slider-logo">
    <img src="media/logo-dark.svg" alt="Logo">
  </div>
  <div class="slider-content">
    <h1 id="title4">Advocating for<br>Gender equality</h1>
    <p id="description4">In all policy decisions at bilateral and multilateral levels<br>In all research programs<br>In all teaching and training curricula.</p>
  </div>
  <div class="slider-button">FULL WEBSITE COMMING ON MONDAY 5 OCTOBER 2023 </div>
</div>
<div class="slider-item" style="background-image: url('media/stockholminitiative-cover5.jpg');">
  <div class="slider-logo">
    <img src="media/logo-dark.svg" alt="Logo">
  </div>
  <div class="slider-content">
    <h1 id="title5">Promoting private Initiatives</h1>
    <p id="description5"></p>
  </div>
  <div class="slider-button">FULL WEBSITE COMMING ON MONDAY 5 OCTOBER 2023</div>
</div>
<div class="slider-item" style="background-image: url('media/stockholminitiative-cover6.jpg');">
  <div class="slider-logo">
    <img src="media/logo-dark.svg" alt="Logo">
  </div>
  <div class="slider-content">
    <h1 id="title6">Teaching Agriculture</h1>
    <p id="description6"></p>
  </div>
  <div class="slider-button">FULL WEBSITE COMMING ON MONDAY 5 OCTOBER 2023 </div>
</div>
 
  </div>
  <script>
    var sliderItems = document.querySelectorAll('.slider-item');
    var currentSlide = 0;
    var slideInterval = setInterval(nextSlide, 5000);
    
    function nextSlide() {
      var current = sliderItems[currentSlide];
      current.classList.remove('active');
      current.style.zIndex = 1;
      current.style.opacity = 0;
      
      currentSlide = (currentSlide + 1) % sliderItems.length;
      
      var next = sliderItems[currentSlide];
      next.classList.add('active');
      next.style.zIndex = 4;
      next.style.opacity = 1;
    }
  </script>
</body>
</html>