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How To Create A Simple Slideshow In Javascript

W3.CSS Slideshow


Caption text

Caption text

Caption text


Manual Slideshow

Displaying a manual slideshow with W3.CSS is very easy.

Just create many elements with the same class name:

Example

<img class="mySlides" src="img_snowtops.jpg">
<img class="mySlides" src="img_lights.jpg">
<img class="mySlides" src="img_mountains.jpg">
<img class="mySlides" src="img_forest.jpg">

And two buttons to scroll the images:

Example

<button class="w3-button w3-display-left" onclick="plusDivs(-1)">&#10094;</button>
<button class="w3-button w3-display-right" onclick="plusDivs(+1)">&#10095;</button>

And add a JavaScript to select images:

Example

var 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[i].style.display = "none";
}
  x[slideIndex-1].style.display = "block";
}

Try It Yourself »

JavaScript Explained

First, set the slideIndex to 1. (First picture)

Then call showDivs() to display the first image.

When the user clicks one of the buttons call plusDivs().

The plusDivs() function subtracts one or adds one to the slideIndex.

The showDiv() function hides (display="none") all elements with the class name "mySlides", and displays (display="block") the element with the given slideIndex.

If the slideIndex is higher than the number of elements (x.length), the slideIndex is set to zero.

If the slideIndex is less than 1 it is set to number of elements (x.length).



Automatic Slideshow

To display an automatic slideshow is even simpler.

You only need a little different JavaScript:

Example

var slideIndex = 0;
carousel();

function carousel() {
  var i;
  var x = document.getElementsByClassName("mySlides");
  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(carousel, 2000); // Change image every 2 seconds
}

Try It Yourself »


HTML Slides

The slides do not have to be images.

They can be any HTML content:

Slide 1

Lorem ipsum

Slide 2

Lorem ipsum

Slide 3

Lorem ipsum

Example

<div class="mySlides">
  <div class="w3-container w3-red">
    <h1><b>Did You Know?</b></h1>
    <h1><i>We plan to sell trips to the moon in the 2020s</i></h1>
  </div>
</div>

Try It Yourself »


Slideshow Caption

Snow, Norway

Northern Lights, Norway

Beautiful Mountains

The Rain Forest

Mountains!

Add a caption text for each image slide with the w3-display-* classes (topleft, topmiddle, topright, bottomleft, bottommiddle, bottomright, left, right or middle):

Example

<div class="w3-display-container mySlides">
  <img src="img_snowtops.jpg" style="width:100%">
  <div class="w3-display-bottomleft w3-container w3-padding-16 w3-black">
    French Alps
  </div>
</div>

Try It Yourself »


Slideshow Indicators

An example of using buttons to indicate how many slides there are in the slideshow, and which slide the user is currently viewing.

Example

<div class="w3-center">
  <button class="w3-button" onclick="plusDivs(-1)">&#10094; Prev</button>
  <button class="w3-button" onclick="plusDivs(1)">Next &#10095;</button>

  <button class="w3-button demo" onclick="currentDiv(1)">1</button>
  <button class="w3-button demo" onclick="currentDiv(2)">2</button>
  <button class="w3-button demo" onclick="currentDiv(3)">3</button>
</div>

Try It Yourself »

Another example:

Example

<div class="w3-content w3-display-container">
  <img class="mySlides" src="img_nature.jpg">
  <img class="mySlides" src="img_snowtops.jpg">
  <img class="mySlides" src="img_mountains.jpg">
  <div class="w3-center w3-display-bottommiddle" style="width:100%">
    <div class="w3-left" onclick="plusDivs(-1)">&#10094;</div>
    <div class="w3-right" onclick="plusDivs(1)">&#10095;</div>
    <span class="w3-badge demo w3-border" onclick="currentDiv(1)"></span>
    <span class="w3-badge demo w3-border" onclick="currentDiv(2)"></span>
    <span class="w3-badge demo w3-border" onclick="currentDiv(3)"></span>
  </div>
</div>

Try It Yourself »


Images as Indicators

An example of using images as indicators:

Example

<div class="w3-content" style="max-width:1200px">
  <img class="mySlides" src="img_nature_wide.jpg" style="width:100%">
  <img class="mySlides" src="img_snow_wide.jpg" style="width:100%">
  <img class="mySlides" src="img_mountains_wide.jpg" style="width:100%">

  <div class="w3-row-padding w3-section">
    <div class="w3-col s4">
      <img class="demo w3-opacity" src="img_nature_wide.jpg"
      style="width:100%" onclick="currentDiv(1)">
    </div>
    <div class="w3-col s4">
      <img class="demo w3-opacity" src="img_snow_wide.jpg"
      style="width:100%;display:none" onclick="currentDiv(2)">
    </div>
    <div class="w3-col s4">
      <img class="demo w3-opacity" src="img_mountains_wide.jpg"
      style="width:100%;display:none" onclick="currentDiv(3)">
    </div>
  </div>
</div>

Try It Yourself »


Multiple Slideshows on the Same Page

To operate multiple slideshows on one page, you must class the members of each slideshow group with different classes:

Example

<div class="w3-content">
<img class="mySlides1" src="img_snowtops.jpg" style="width:100%">
<img class="mySlides1" src="img_lights.jpg" style="width:100%">
<img class="mySlides1" src="img_mountains.jpg" style="width:100%">
<img class="mySlides1" src="img_forest.jpg" style="width:100%">
</div>

<div class="w3-content">
<img class="mySlides2" src="img_la.jpg" style="width:100%">
<img class="mySlides2" src="img_ny.jpg" style="width:100%">
<img class="mySlides2" src="img_chicago.jpg" style="width:100%">
</div>

Try It Yourself »


Animated Slides

Slide or fade in an element from the top, bottom, left or right of the screen with the w3-animate-* classes.

Example

<img class="mySlides w3-animate-top"    src="img_01.jpg">
<img class="mySlides w3-animate-bottom" src="img_02.jpg">
<img class="mySlides w3-animate-top"    src="img_03.jpg">
<img class="mySlides w3-animate-bottom" src="img_04.jpg">

Try It Yourself »


Faded Animation

The w3-animate-fading class fades an element in and out (takes about 10 seconds).

Example

<img class="mySlides w3-animate-fading" src="img_01.jpg">
<img class="mySlides w3-animate-fading" src="img_02.jpg">
<img class="mySlides w3-animate-fading" src="img_03.jpg">
<img class="mySlides w3-animate-fading" src="img_04.jpg">

Try It Yourself »



How To Create A Simple Slideshow In Javascript

Source: https://www.w3schools.com/w3css/w3css_slideshow.asp

Posted by: ramergoope1995.blogspot.com

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