Question

need to obsfucate details of a DIV to blur contents in a web page (to tease a user of what they'll get if they purchase)

Asked by: stevelopez

I need to create a blurred version of parts of a webpage.  It will be used very similarly to how EE displays answers to non-members as a way to tease them to join.   How can this be done?

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Asked On
2007-08-28 at 05:48:44ID22791273
Tags

blur

,

div

Topics

Cascading Style Sheets (CSS)

,

JavaScript

,

Miscellaneous Web Development

Participating Experts
2
Points
500
Comments
9

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Answers

 

by: mplungjanPosted on 2007-08-28 at 05:53:07ID: 19782409

 

by: mplungjanPosted on 2007-08-28 at 05:58:54ID: 19782451

1. if you do it on the client side, people can just view-source
2. if you want something similar to EE you can do

<script>
var texts = new Array(
"Text 1",
"Text 2",
"Text 3",
"Text 4",
"Text 5"
); // notice the lack of comma on the last

// here you can copy the function from
// http://personal.inet.fi/cool/jjlammi/rot13.html
for (var i=0;i<texts.length;i++) {
  document.write('<div id="div'+i+'">'+rot13(texts[i]+'</div>');
}
</script>

and to toggle the code do

document.getElementById('div0').innerHTML=rot13(document.getElementById('div0').innerHTML)

for the first div

 

by: ellandrdPosted on 2007-08-28 at 07:19:09ID: 19783258

>>It will be used very similarly to how EE displays answers to non-members as a way to tease them to join.   How can this be done?

If you sign out and try viewing a solution, when you hover over the solution, you'll notice its an image and this can be done using server-side scripting languages such as PHP enabled with support for the GD library for example.  However im sure it can be done in ASP el et.

I have never come across a solution done in pure CSS, althought back in the days of IE6, Microsoft had a filter function available which blurred text etc but this isnt a cross browser solution.

Michel's solution above is probably your best bet - I had a quick look and I have to approve of it.  I've bookmarked it myself to use in the future as I was unware of it myself...

ellandrd

 

by: stevelopezPosted on 2007-08-28 at 07:35:19ID: 19783410

Ideally the solution would be completely server-side.  This way someone can't just turn off JavaScript to avoid the obsfucation.  If i understand the responses so far I think they are all client-side and therefore not (as) foolproof to people trying to view the info without subscription.  

My app server is JSP/Java.

Any additional thoughts or suggestions?

thanks,
Steve

 

by: ellandrdPosted on 2007-08-28 at 07:44:18ID: 19783489

yes you are quite right - disabling JS is a workaround, however using graphics to hide the text like EE has done is probably what your after.  JSP can create images on the fly however my knowledge of JSP is beginner level so try this:

<%@ page import="javax.servlet.http.*"%>
<%@ page import="java.io.*"%>
<%@ page import="java.awt.*"%>
<%@ page import="java.util.Random"%>
<%@ page import="java.awt.Color"%>
<%@ page import="java.awt.image.*"%>
<%@ page import="Acme.JPM.Encoders.GifEncoder"%>
<%@ page import="com.sun.image.codec.jpeg.JPEGCodec"%>
<%@ page import="com.sun.image.codec.jpeg.JPEGImageEncoder"%>
<%
BufferedImage image= new BufferedImage(500,500, BufferedImage.TYPE_INT_RGB);
Graphics g=image.getGraphics();
Random r=new Random();
g.fillRect(r,r,r,r);
FileOutputStream fos=new FileOutputStream("c:/ellandrds_solution.jpg");
JPEGImageEncoder encoder= JPEGCodec.createJPEGEncoder(fos); encoder.encode(image);
%>

Also look at the com.sun.image.codec.jpeg package...

These links will also help you..

http://today.java.net/pub/a/today/2004/04/22/images.html
http://www.javaside.com/asp/mfr.asp?page=/us/jspImage_f.shtml

ellandrd

 

 

by: mplungjanPosted on 2007-08-29 at 02:12:03ID: 19789682

Since it was found in the javascript/css TA I suggested a javascript solution with the caveat of
"if you do it on the client side, people can just view-source"

So the image suggestion is the best

 

by: stevelopezPosted on 2009-05-29 at 04:44:19ID: 24501930

that 50/50 credit proposal is fine - thanks you.

 

by: mplungjanPosted on 2009-05-29 at 10:10:57ID: 24504297

So feel free to split and save admin work :)

20120131-EE-VQP-002

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