My CSS, HTML, and JavaScript slide show is not working correctly

[quinndelano]

I am using a slideshow template that was supposed to be for three slides, styled with a little css, but when i went to add more slides, it completely removed the navigation buttons.

here is my code:

<div class="slideshow-container">
  <div class="mySlides fade">
    <div class="numbertext">1 / 9</div>
		<img src="images/tour/bedroom_1.jpg">
    <div class="text">The Bedrooms</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">2 / 9</div>
    <img src="images/tour/bedroom_2.jpg">
    <div class="text">The Bedrooms</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">3 / 9</div>
    <img src="images/tour/bedroom_9.jpg">
    <div class="text">The Bedrooms</div>
	<div class="slideshow-container">
	
  <div class="mySlides fade">
    <div class="numbertext">4 / 9</div>
		<img src="images/tour/dining_1.jpg">
    <div class="text">Fine Dining</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">5 / 9</div>
    <img src="images/tour/dining_2.jpg">
    <div class="text">Fine Dining</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">6 / 9</div>
    <img src="images/tour/dining_9.jpg">
    <div class="text">Fine Dining</div>
  </div>
  
    <div class="mySlides fade">
    <div class="numbertext">7 / 9</div>
		<img src="images/tour/Lobby_1.jpg">
    <div class="text">The Lobby</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">8 / 9</div>
    <img src="images/tour/lobby_2.jpg">
    <div class="text">The Lobby</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">9 / 9</div>
    <img src="images/tour/lobby_9.jpg">
    <div class="text">The lobby</div>
  </div>

  <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
  <a class="next" onclick="plusSlides(1)">&#10095;</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>
  <span class="dot" onclick="currentSlide(4)"></span>
  <span class="dot" onclick="currentSlide(5)"></span>
  <span class="dot" onclick="currentSlide(6)"></span>
  <span class="dot" onclick="currentSlide(7)"></span>
  <span class="dot" onclick="currentSlide(8)"></span>
  <span class="dot" onclick="currentSlide(9)"></span>
</div>
<script>
var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
  showSlides(slideIndex += n);
}

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";
}
</script>

</div>

The CSS:

* {box-sizing:border-box}

/* Slideshow container */
.slideshow-container {
  max-width: 950px;
  position: relative;
  margin: auto;
}

.mySlides {
    display: none;
}

/* Next & previous buttons */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  margin-top: -22px;
  padding: 16px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
}

/* 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: white;
  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: 13px;
  width: 13px;
  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}
}

[ronpat]

Have you validated your HTML?
https://validator.w3.org/nu/

In the third group above, the last line looks out of place.

            <div class="slideshow-container">

It should be replaced by a close </div>.

Other than that, it would be nice if the URLs to the images worked.

May I ask who publishes the slider?

[quinndelano]

I got the slideshow code from https://www.w3schools.com/howto/howto_js_slideshow.asp
Ill try validating it, and replacing the code you pointed out and ill get back to you

[quinndelano]

that code error you pointed out did turn out to be the problem.