What could be causing the margin-top property to fail to update when using jQuery.animate?

Just delving into the world of jQuery for the first time, I decided to create a simple photo slider plugin as a beginner project. However, I've encountered an issue with updating the margin-top property on my image tags. Initially, I thought the margins were collapsing, but now I'm uncertain. Any guidance would be greatly appreciated!

I suspected that the problem lay in the 10px margin on .slider-frame and the -58px margin on .photo-slider, but if they were collapsing, shouldn't it result in a -48px margin between them? Upon inspecting with firebug, the margin-top property remains unchanged at 10px when hovering over the image.

Here is the HTML code that I am generating:

<div id="photos" class="photo-slider-container">
  <div class="photo-slider">
    <img class="slider-frame" src="images/test-image.jpg"/>
    <img class="slider-frame" src="images/test-image-2.jpg"/>
    <img class="slider-frame" src="images/test-image-3.jpg"/>
    <img class="slider-frame" src="images/test-image-4.jpg"/>
    <img class="slider-frame" src="images/test-image-5.jpg"/>
  </div>
</div>

Additionally, here is the CSS extracted using jQuery for better clarity:

.photo-slider-container{
    overflow: hidden; 
    visibility: visible; 
    position: relative; 
    background-color: rgb(0, 0, 0); 
    height: 216px; 
    width: 800px; 
    margin-left: auto; 
    margin-right: auto;
}

.photo-slider {
    margin: -58px 0px 0px -580px;
    position: absolute;
    padding-top: 1px;
    left: 50%;
    top: 50%;
    width: 1160px;
}

.slider-frame {
 margin: 10px 5px; 
 float: left; 
 width: 96px; 
 height: 96px;
}

This is the hover code snippet being utilized:

$(this).hover(
  function(){
   $(this).stop().animate({
      "height" : opts.large_image_height,
      "width" : opts.large_image_width,
      "margin-top" : opts.large_image_height / -2 + "px"
    }, { duration : 250 })
  },
  function() {
    $(this).stop().animate({
      "height" : opts.small_image_height,
      "width" : opts.small_image_width,
      "margin-top" : "10px"
    }, { duration : 250 })
  }
);

Edit Uploaded on jsbin

Answer №1

Oh, it's actually marginTop. - It seems like the internal animation parser doesn't interpret 'margin-top' as the actual marginTop property.

Check out this example: http://jsbin.com/uxazo

Keep in mind that your script may encounter issues in Internet Explorer due to the presence of trailing commas within your objects:

{
one:1,
two:2, <---- remove this.
}

Answer №2

Seems like I missed the boat - it's actually marginTop not margin-top within the animate() function. Was the solution you were searching for something along the lines of this example?

I'll still provide an answer since another useful enhancement to consider is storing $(this) in a local variable inside the each() loops, like so:

    return this.each(function() { 

  Cache this ->  $(this).wrap("<div></div>"); 
                 slider_container = $(this).parent(); 

now becomes

    return this.each(function() { 
        var $this = $(this);
        $this.wrap("<div></div>"); 
        slider_container = $this.parent(); 

This ensures that a new jQuery object isn't created every time you use $() with this

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