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how can you stop relative - absolute div collapse

Posted on 2013-01-10
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Last Modified: 2013-01-15
How can I stop the div #banner_ad_wrapper from collapsing.  The reason I am using position absolute on .banner_ad is I want to stack them on top of each other.  Should I be doing this a different way.  Thanks

#banner_ad_wrapper {
	position:relative;
	margin-top:20px;
}
.banner_ad {
	width:920px;
	margin-left:20px;
	position:absolute;
	top:0;
}

<div id="banner_ad_wrapper">
<div  class="banner_ad">
  <img src="images/010713_JewelryHandbagWalletSale_site.jpg" width="920" />
</div>
<div class="banner_ad">
  <img src="images/011013_save10whenyouspend100v4.jpg" width="920"/>
  </div>
</div>

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Question by:Luey
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6 Comments
 
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Expert Comment

by:jessegivy
ID: 38764224
Try this:

#banner_ad_wrapper {
      position:relative;
      margin-top:20px;
        overflow:visible;
}
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LVL 53

Expert Comment

by:COBOLdinosaur
ID: 38764475
If that help... lucky.  If not a link to the page or the code would give us enough information to provide a full solution.  As it stands you have no z-index; so how do you intend to manage the stacking order?

Cd&
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Author Comment

by:Luey
ID: 38764859
The stacking order is not relevant I will be using javascript to toggle show and hide the divs with the class banner_ads.  I just want to know how to put one div on top of another.  If you use a parent div positioned relative and a sibling div positioned absolute then the parent collapses.  So how can you stack divs on top of each other but keep the rest of you content to flow in a normal fashion.
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Author Comment

by:Luey
ID: 38764866
overflow:visible;  did not work.
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Accepted Solution

by:
Luey earned 0 total points
ID: 38765010
I have found that when you position something absolute it will always take it out of the normal flow of content therefore it will always collapse the parent if a height is not set for the parent.  So I have set a height for my parent div and solved the problem.

#banner_ad_wrapper {
	position:relative;
	margin-top:20px;
	height:300px;	
}

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Author Closing Comment

by:Luey
ID: 38777591
I did not get an answer that solved the problem.  However from other resources i found the answer.
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