Unexpected results with jQuery fade effect

I've made some changes to the code found on this page in order to switch images with a fading effect when clicked.

Here is the modified code:

$(function() {
  $("input:button").click(function() {
    $("img:last").fadeToggle("slow", function() {
      $(this).prependTo(".frame").show()
    });
  });
});

function Forward() {
  $("img:first").fadeToggle("slow", function() {
    $(this).appendTo(".frame").show()
  });
}

function Backward() {
  $("img:last").fadeToggle("slow", function() {
    $(this).prependTo(".frame").show()
  });
}
.frame {
  position: relative;
  left: 35%;
}

img {
  position: absolute;
  max-width: 30%;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<h1>
  <input type="button" value="PrependTo" />
  <button onclick="Forward()">Go Forward</button>
  <button onclick="Backward()">Go Backward</button>

</h1>
<div class="frame">
  <img src="img/home-00.jpg">
  <img src="img/home-01.jpg">
  <img src="img/home-02.jpg">
  <img src="img/home-03.jpg">
</div>

The original code, which is triggered by the Backward() function, functions correctly. However, the updated Forward() does not seem to be working as expected. The fading effect is not displaying properly. Additionally, I am confused as to why the image shown is always the one at the bottom of the stack within the <div class="frame"> element. Can anyone provide assistance?

Answer №1

This unique optical illusion occurs due to the arrangement of four images stacked on top of each other.

The parent div is set as relative, with each image positioned absolutely, causing them to overlap. The topmost image is the only one visible, while the rest are hidden beneath.

Clicking the Forward button triggers a fade-out effect on the bottom image (invisible), which is then moved to the top using appendTo(), making it suddenly visible.

Conversely, pressing backwards fades out the top image (visible) and moves it to the bottom using prependTo(), creating a seamless transition into the underlying image.

Enhance the experience by incorporating a fadeIn() transition in the Forward function when revealing the newly added image at the bottom of the stack. It's unnecessary for the Backward action since the insertion is not visually noticeable to users.

$(function() {
  $("input:button").click(function() {
    $("img:last").fadeToggle("slow", function() {
      $(this).prependTo(".frame").fadeIn()
    });
  });
});

function Forward() {
  $("img:first").fadeToggle("slow", function() {
    $(this).appendTo(".frame").fadeIn(800)
  });
}

function Backward() {
  $("img:last").fadeToggle("slow", function() {
    $(this).prependTo(".frame").fadeIn()
  });
}
.frame {
  position: relative;
  left: 35%;
}

img {
  position: absolute;
  max-width: 30%;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<h1>
  <input type="button" value="PrependTo" />
  <button onclick="Forward()">Go Forward</button>
  <button onclick="Backward()">Go Backward</button>

</h1>
<div class="frame">
  <img src="http://placeimg.com/240/180/animals">
  <img src="http://placeimg.com/240/180/nature">
  <img src="http://placeimg.com/240/180/people">
  <img src="http://placeimg.com/240/180/sepia">
</div>

Update:

It turns out that adding fadeIn() to the Back button also addresses the observation made by user Obscure. Well spotted!

Answer №2

I made some tweaks to the code provided by cssyphus, resulting in a more consistent fading speed for both forward and backward animations:

function MoveForward() {
    $("img:first").fadeOut(150, function() {
        $(this).appendTo(".frame").fadeIn(450);
    });
}
function MoveBackward() {
    $("img:last").fadeOut(600, function() {
        $(this).prependTo(".frame").fadeIn();
    });
}

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