Question

First time posting, please bear with me.

I’m trying to create a slideshow that:

• assigns a z-index to each <section>
• sets all slides with an opacity of 0.7
• assigns the currently top slide an opacity of 1

Here is the HTML:

<div id="slides">
  <section class="slide">
    <article>
      <h1>6</h1>
    </article>
  </section>
  <section class="slide">
    <article>
      <h1>5</h1>
    </article>
  </section>
  <section class="slide">
    <article>
      <h1>4</h1>
    </article>
  </section>
  <section class="slide">
    <article>
      <h1>3</h1>
    </article>
  </section>
  <section class="slide">
    <article>
      <h1>2</h1>
    </article>
  </section>
  <section class="slide">
    <article>
      <h1>1</h1>
    </article>
  </section>
</div>
<div id="prev">
  <a href="#previous">&larr;</a>
</div>
<div id="next">
  <a href="#next">&rarr;</a>
</div>

Here is the JS so far:

$(document).ready(function() {
  var z = 0;
  var inAnimation = false;

  $('section.slide').each(function() {
    z++;
    $(this).css('z-index', z);
  });

  function swapFirstLast(isFirst) {
    if(inAnimation) return false;
    else inAnimation = true;

    var processZindex, direction, newZindex, inDeCrease;

    if(isFirst) {
      processZindex = z; direction = '-'; newZindex = 1; inDeCrease = 1;
    } else {
      processZindex = 1; direction = ''; newZindex = z; inDeCrease = -1;
    }

    $('section.slide').each(function() {
      if($(this).css('z-index') == processZindex) {
        $(this).animate({ 'top' : direction + $(this).height() + 'px' }, 'slow', function() {
          $(this).css('z-index', newZindex)
          .animate({ 'top' : '0' }, 'slow', function() {
            inAnimation = false;
          });
        });
      } else {
        $(this).animate({ 'top' : '0' }, 'slow', function() {
          $(this).css('z-index', parseInt($(this).css('z-index')) + inDeCrease);
        });
      }

      return false;
    }

    $('#next a').click(function() {
      return swapFirstLast(true);
    });

    $('#prev a').click(function() {
      return swapFirstLast(false);
    });
  });
});

I thought I could insert the following code into the script:

if($(this).css('z-index') == processZindex) {
  $(this).css('opacity', 1);
} else {
  $(this).css('opacity', 0.7);
}

The problem is I can’t seem to get the opacity at 1 to keep up with the z-index value of 6. So I thought about writing $(this).css('z-index') == processZindex as $(this).css('z-index') != 6 but the issue occurs.

Is there a simpler way to code this?

Answer 1

I just used the ordering of elements instead of z-index, using appendTo,preprendTo:

http://jsfiddle.net/jtbowden/RAT8N/1/

I couldn’t decide if one function or separate functions was better. Here is two separate functions:

http://jsfiddle.net/jtbowden/5LJcA/3/

Is that what you are going for?