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Query parameters, Javascript and URL decoding issue

I am having an interesting and rather frustrating issue with the
encoding/decoding of parameters with the ASP.NET runtime. What I am
doing isn't exactly revolutionary so hopefully someone has an answer
for this.

I have a page that accepts a number of parameters. Those parameters may
sometimes include URL reserved characters like spaces and ampersands. I
use a combination of HTML and URL encoding to build links to this page
and everything works fine. No rocket science there. When however I open
a new window via javascript, the runtime seems to act unpredicatbly and
misdecode characters, namely %26, the URL encoded ampersand. For
example, the following URL in this case would work like a charm as part
of an href attribute:

mypage.aspx?t=H ome%20%26%20Ent ertaining&c =Home&p=tru e

You would get three parameter values: "Home & Entertaining", "Home",
and "true". Writing out the Request.Url in the debugger gives the
following absolute URL:

http://mydomain.com/mypage.aspx?t=Ho...&c=Home&p=true

When that same URL is written into javascript like so:

String.Format(" javascript:wind owPop('mypage.a spx?t={0}&c ={1}&p=true ','',515,600,'n o','no','yes')" ,
Server.UrlEncod e(title.Replace ("'","\\'")).Re place("+", "%20"),
Server.UrlEncod e(category.Repl ace("'","\\'")) .Replace("+", "%20"));

*Note that windowPop is just a wrapper for
window.open(url ,name,propertie s) and isn't important. The extra replace
functions are to escape apostrophes properly for c# and Javascript and
get real space encoding %20 instead of the IE specific plus character
UrlEncoding uses. (Causes the URL not to be found in Mozilla based
browsers)

You get four query parameter values: "Home ", " Entertaining", "Home",
and "true". And writing out the absolute URL in the debugger via "?
Request.Url" gives you the following bad URL:

http://mydomain.com/mypage.aspx?t=Ho...&c=Home&p=true

As you can see the URL encoding for all but the ampersand in the t
parameter is intact.

Anything that can shed light on this behavior would be greatly
apprciated.

Dec 22 '05 #1
0 2029

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