w3 slider - multiple sliders on one page

[peter_bv]

I have tried to implement multiple sliders on one page. The carousel function now get the respective slider name passed "carousel(slider)". The code is executed correctly, the function is being called by the time and the argument/object is correct. The display block/none property is set but anyway, the image does not change. Tried on IE, Edge, Chrome. What could I have done wrong?

 

<div class="container">
  <div class="w3-row">
    <div class="w3-third w3-container" align="center">
    <img src="http://media.bitronvideo.eu/b-home/bitronvideosito/interno3.png" width="300px">
    [maxbutton id="12"]
&nbsp;
<img class="mySlides1" src="http://media.bitronvideo.eu/b-home/bitronvideosito/de.png">
<img class="mySlides1" src="http://media.bitronvideo.eu/b-home/bitronvideosito/it.png">
<img class="mySlides1" src="http://media.bitronvideo.eu/b-home/bitronvideosito/it.png">
  </div> 
  <div class="w3-third w3-container" align="center">
    <img src="http://media.bitronvideo.eu/b-home/bitronvideosito/interno2.png" width="300px">
    [maxbutton id="7"]
&nbsp;
<img class="mySlides2" src="http://media.bitronvideo.eu/b-home/bitronvideosito/btouch11.png">
<img class="mySlides2" src="http://media.bitronvideo.eu/b-home/bitronvideosito/tline11.png">
  </div>  
   <div class="w3-third w3-container" align="center">
    <img src="http://media.bitronvideo.eu/b-home/bitronvideosito/interno1.png" width="300px">
    [maxbutton id="11"]
&nbsp;
<img class="mySlides3" src="http://media.bitronvideo.eu/b-home/bitronvideosito/citofono1.png">
<img class="mySlides3" src="http://media.bitronvideo.eu/b-home/bitronvideosito/tclass1.png">
  </div>  
</div>
</div> <!-- chiusura container -->

<style>
.mySlides1 {display:none;}
.mySlides2 {display:none;}
.mySlides3 {display:none;}
</style>
<script type="text/javascript">
function carousel(slider)
{
    var slideIndex = 0;
    var i;
    var x = document.getElementsByClassName(slider);
    for (i = 0; i < x.length; i++) 
    {
      x[i].style.display = "none"; 
    }
    slideIndex++;
    if (slideIndex > x.length) {slideIndex = 1} 
    x[slideIndex-1].style.display = "block"; 
    setTimeout(function(){carousel(slider);}, 2000); // Change image every 2 seconds
}
carousel("mySlides1");
carousel("mySlides2");
carousel("mySlides3");
</script>

 

[dsonesuk]

The slideIndex will always be 1; When function called

var slideIndex = 0;

then further on

slideIndex++;