Bonjour,

J'aimerais avoir une aide s'il vous plait, j'essaye de mettre sur ma page web un Slideshow mais mon code javascript me donne l'erreur suivante
Uncaught TypeError: Cannot read properties of undefined (reading 'style')
pourtant j'ai bel et bien appelé l'élément par son nom de classe mais il me dit quand même que il ne voit pas à qui appliquer le style.
Merci

Code : Sélectionner tout - Visualiser dans une fenêtre à part
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
var slideIndex = 1;
showSlides(slideIndex);
 
// Next/previous controls
function plusSlides(n) {
  showSlides(slideIndex += n);
}
 
// Thumbnail image controls
function currentSlide(n) {
  showSlides(slideIndex = n);
}
 
function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("dot");
  if (n > slides.length) {slideIndex = 1}
  if (n < 1) {slideIndex = slides.length}
  for (i = 0; i < slides.length; i++) {
      slides[i].style.display = "none";
  }
  for (i = 0; i < dots.length; i++) {
      dots[i].className = dots[i].className.replace(" active", "");
  }
  slides[slideIndex-1].style.display = "block";
  dots[slideIndex-1].className += " active";
}
Code HTML : Sélectionner tout - Visualiser dans une fenêtre à part
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
<!DOCTYPE html>
<html>
    <head>
        <title>Boulangerie</title>
           <meta charset="utf-8"/>
        <meta name="viewport" content="width=device-width, initial-scale=1">
       <link href="https://fonts.googleapis.com/css2?family=Festive&family=Lobster&family=Roboto+Mono&family=Zen+Old+Mincho&display=swap" rel="stylesheet">
        <link rel="stylesheet" href="CSS/style.css" type="text/css">
        <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
        <script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" ></script>
        <script src="script/script.js"></script>
    </head>
   <body>
      <div class="slideshow-container">
 
<div class="mySlides fade">
  <div class="numbertext">1 / 3</div>
  <img src="image/img1.jpg" style="width:100%">
  <div class="text">Caption Text</div>
</div>
 
<div class="mySlides fade" >
  <div class="numbertext">2 / 3</div>
  <img src="image/img10.jpg" style="width:100%">
  <div class="text">Caption Two</div>
</div>
 
<div class="mySlides fade" >
  <div class="numbertext">3 / 3</div>
  <img src="image/img11.jpg" style="width:100%">
  <div class="text">Caption Three</div>
</div>
 
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
 
</div>
<br>
 
<div style="text-align:center">
  <span class="dot" onclick="currentSlide(1)"></span> 
  <span class="dot" onclick="currentSlide(2)"></span> 
  <span class="dot" onclick="currentSlide(3)"></span> 
</div>
 
        <section id="image">
            <div class="wrapper"></div>
        </section>
 
        <section id="apropos">
            <div class="wrapper">
                <h1>A propos</h1>
                <p>Pains, pizza, tartes, brioches, fèvres au lard, sauce a spaghetti, conserves maison, sous marins, fromage</p>
                     <ul id="img-presentation">
                        <li id="item1"></li>
                        <li id="item2"></li>
                        <li id="item3"></li>
                    </ul>
            </div>
        </section>
        <section id="nosproduits">
            <div class="wrapper">
                 <h1>Nos produits</h1>
                   <ul id="img-presentation2">
                        <li><img src="image/img2.jpg" class="img-circle"></li>
                        <li><img src="image/img4.jpg" class="img-circle" ></li>
                        <li><img src="image/img7.jpg" class="img-circle" ></li>
                    </ul>
            </div>
        </section>
 
 
    </body>
</html>
Code CSS : Sélectionner tout - Visualiser dans une fenêtre à part
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
img 
{
    vertical-align: middle;
   width:100%;
    height: 100%;
}
 
/* Slideshow container */
.slideshow-container {
  max-width: 1000px;
  position: relative;
  margin: auto;
}
 
/* Next & previous buttons */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  padding: 16px;
  margin-top: -22px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
}
 
/* Position the "next button" to the right */
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}
 
/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
  background-color: rgba(0,0,0,0.8);
}
 
/* Caption text */
.text {
  color: #f2f2f2;
  font-size: 15px;
  padding: 8px 12px;
  position: absolute;
  bottom: 8px;
  width: 100%;
  text-align: center;
}
 
/* Number text (1/3 etc) */
.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}
 
/* The dots/bullets/indicators */
.dot {
  cursor: pointer;
  height: 15px;
  width: 15px;
  margin: 0 2px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}
 
.active, .dot:hover {
  background-color: #717171;
}
 
/* Fading animation */
.fade {
  -webkit-animation-name: fade;
  -webkit-animation-duration: 1.5s;
  animation-name: fade;
  animation-duration: 1.5s;
}
 
@-webkit-keyframes fade {
  from {opacity: .4} 
  to {opacity: 1}
}
 
@keyframes fade {
  from {opacity: .4} 
  to {opacity: 1}
}
 
/* On smaller screens, decrease text size */
@media only screen and (max-width: 300px) {
  .prev, .next,.text {font-size: 11px}
}