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Need navigation buttons for HTML Slideshow


aguy123
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So I'm making a slide show for a specific page on my website. Here's the slideshow page I'm talking about: http://offsavingtheworld.com/extra
I have the "previous" and "next" buttons worked out:

<button class="w3-btn" onclick="plusDivs(-1)">❮ Prev</button>
<button class="w3-btn" onclick="plusDivs(1)">Next ❯</button>

 

What I'm trying to create are buttons that show the very first, very last, and a completely random image, if that's even possible. Is this even possible using the code I have here?:

<p><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="http://www.w3schools.com/lib/w3.css"></p>

<div class="w3-content" style="max-width:900px;position:relative">

<img class="mySlides" src="IMG URL" style="width:100%"/><img class="mySlides" src="IMG URL" style="width:100%"/><img class="mySlides" src="IMG URL" style="width:100%"/><img class="mySlides" src="IMG URL" style="width:100%"/><div class="w3-center">
<div class="w3-section">

<button class="w3-btn" onclick="plusDivs(-1)">❮ Prev</button>

<button class="w3-btn" onclick="plusDivs(1)">Next ❯</button>

</div>

</div>

</div>

</div>

<script type=text/javascript>

 

slideIndex = 1;
showDivs(slideIndex);

function plusDivs(n) {
showDivs(slideIndex += n);
}

function showDivs(n) {

var i;
var x = document.getElementsByClassName("mySlides");
if (n > x.length) {slideIndex = 1}
if (n < 1) {slideIndex = x.length} ;
for (i = 0; i < x.length; i++) {
x.style.display = "none";
}
x[slideIndex-1].style.display = "block";
}

</script>

 

Sorry if I posted this incorrectly. I'm new to this forum.

Edited by aguy123
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Just use selectIndex set to required index

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="http://www.w3schools.com/lib/w3.css">
<body>

<h2 class="w3-center">Manual Slideshow</h2>

<div class="w3-content" style="max-width:800px;position:relative">

<img class="mySlides" src="img_fjords.jpg" style="width:100%">
<img class="mySlides" src="img_lights.jpg" style="width:100%">
<img class="mySlides" src="img_mountains.jpg" style="width:100%">
<img class="mySlides" src="img_forest.jpg" style="width:100%">

<a class="w3-btn-floating" style="position:absolute;top:45%;left:-40px" onclick="showDivs(slideIndex=1)">❮❮</a>
<a class="w3-btn-floating" style="position:absolute;top:45%;left:0" onclick="plusDivs(-1)">❮</a>

<a class="w3-btn-floating" style="position:absolute;left:47%;bottom:1%" onclick="showDivs(slideIndex=Math.floor((Math.random() * x.length) + 1))">???</a>

<a class="w3-btn-floating" style="position:absolute;top:45%;right:0;" onclick="plusDivs(1)">❯</a>
<a class="w3-btn-floating" style="position:absolute;top:45%;right:-40px" onclick="showDivs(slideIndex =x.length)">❯❯</a>
</div>

<script>



var slideIndex = 1;
showDivs(slideIndex);

function plusDivs(n) {
  showDivs(slideIndex += n);
}
var x;
function showDivs(n) {
  var i;
  x = document.getElementsByClassName("mySlides")
  if (n > x.length) {slideIndex = 1}    
  if (n < 1) {slideIndex = x.length}
  for (i = 0; i < x.length; i++) {
     x[i].style.display = "none";  
  }
  x[slideIndex-1].style.display = "block";  
}
</script>

</body>
</html> 
Edited by dsonesuk
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