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Screw Javascript - Use CSS to create a lightbox effect
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You are currently in Programming, Web and Software Design/Development
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Fri Aug 24, 2007 10:23 am Reply and quote this post
You may call it Lightbox, or Greybox, or Thickbox, but it's always the same effect. When you are on a page, and click on a photo or trig some event, a Lightbox is an effect that fades the pagein the background to show you new content in the foreground.

There are tons of Lightbox scripts in the web, each one with its unique features and limitations, but all require massive use of Javascript or the installation of javascript frameworks.

In some cases, there are "lightweight" versions with "only" 40KB of Javascript.

This example does not want to compete with those scripts, but if you are looking for a simple, 100% CSS, 0% javascript lightbox, this may help you.

Features of this Lightbox:

100% CSS as said
You can insert any content in it (some scripts out there only allow images)

That's all. Did you need something more? Think wisely...

Let's start with the CSS
CSS:
Code:
.black_overlay{
display: none;
position: absolute;
top: 0%;
left: 0%;
width: 100%;
height: 100%;
background-color: black;
z-index:1001;
-moz-opacity: 0.8;
opacity:.80;
filter: alpha(opacity=80);
}

.white_content {
display: none;
position: absolute;
top: 25%;
left: 25%;
width: 50%;
height: 50%;
padding: 16px;
border: 16px solid orange;
background-color: white;
z-index:1002;
overflow: auto;
}



The black_overlay class is the layer that will make the web page seem to fade. It's a black 80% opaque background as long and wide as the browser that will overlay the web page (look at the z-index) and at the moment is not shown (look at the display).

The white content class is the layer with the photo/login screen/whatever you want to appear in the Lightbox overlay. It's a white layer to be placed over the black_overlay layer (look at the z-index, greater than the black_overlay one). The overflow allows you to have a scrollable content.

In the html file, put this line just before the tag
HTML:
Code:
<div id="light" class="white_content"&gt;
Hi, I am an happy lightbox</div&gt;<div id="fade"
class="black_overlay"&gt;</div&gt;


Now, trig the action you want to open the Lightbox and insert this code:
HTML:
Code:
document.getElementById('light').
style.display='block';document.getElementById('fade').
style.display='block';



For example, in a link would be:
HTML:
Code:
<a href = "javascript:void(0)" onclick = "document.getElementById('light').style.
display='block';document.getElementById('fade').
style.display='block'"&gt;Click me</a&gt;



Remember to include in the lightbox the code to close it, for example
HTML:
Code:
<a href = "javascript:void(0)" onclick = "document.getElementById('light').style.
display='none';document.getElementById('fade').
style.display='none'"&gt;Hide me</a&gt;



A complete example page could be
HTML:
Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"&gt;
<html&gt;
<head&gt;
   <title&gt;LIGHTBOX EXAMPLE</title&gt;
   <style&gt;
   .black_overlay{
     display: none;
     position: absolute;
     top: 0%;
     left: 0%;
     width: 100%;
     height: 100%;
     background-color: black;
     z-index:1001;
     -moz-opacity: 0.8;
     opacity:.80;
     filter: alpha(opacity=80);
   }
   .white_content {
     display: none;
     position: absolute;
     top: 25%;
     left: 25%;
     width: 50%;
     height: 50%;
     padding: 16px;
     border: 16px solid orange;
     background-color: white;
     z-index:1002;
     overflow: auto;
   }
</style&gt;
</head&gt;
<body&gt;
   <p&gt;This is the main content. To display a lightbox click <a href = "javascript:void(0)" onclick = "document.getElementById('light').style.display='block';
document.getElementById('fade').style.display='block'"&gt;
here</a&gt;</p&gt;
   <div id="light" class="white_content"&gt;This is the lightbox content. <a href = "javascript:void(0)" onclick = "document.getElementById('light').style.display='none';
document.getElementById('fade').style.display='none'"&gt;
Close</a&gt;</div&gt;
   <div id="fade" class="black_overlay"&gt;</div&gt;
</body&gt;
</html&gt;


In this example everything is static and preloaded, but you can easily add some php/ajax code to make it more dynamic while keeping the effect 100% CSS based.
Contributed by Editorial Team, Executive Management Team
372659 iVirtua Loyalty Points • View Profile • Send Private Message • Back to Top

Thu Aug 07, 2008 7:35 am Reply and quote this post
This CSS and JavaScript are not working in IE6.
Contributed by tarun.jadav, iVirtua Members
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