THNX Craig At 10:12 AM 4/3/02 -0800, you wrote:
>On Tue, 2 Apr 2002, Micael Padraig Og mac Grene wrote: > > > Date: Tue, 02 Apr 2002 22:29:28 -0800 > > From: Micael Padraig Og mac Grene <[EMAIL PROTECTED]> > > Reply-To: Tomcat Users List <[EMAIL PROTECTED]> > > To: [EMAIL PROTECTED] > > Subject: Images and STRUTS > > > > I tried to do an ordinary image tag with the struts application, and could > > not. What is happening with that? I could not get the index.jsp page to > > reference an image in the same location. I used the same page without > > struts, and it worked. I am just getting the clue on struts. I am > > familiar with the whole of Model 2 architectures, just not struts. Is it > > the forwarding mechanism that is calling the problem? > >You probably want to ask this sort of question on the STRUTS-USER list >instead of here, but here's a common scenario that can cause Struts users >(or anyone else using an architecture that uses RequestDispatcher.forward) >grief: if you are using relative path references for your images, those >paths get resolved against the request URI that the browser submitted to >-- not the URI of the page itself. This is because the browser has no >clue that a RequestDispatcher.forward() call was done on the server side. > >Example: > >- Your app is installed at "http://localhost:8080/myapp"; > >- You have a main page "index.jsp", which therefore has the absolute URI > "http://localhost:8080/myapp/index.jsp";. > >- You have an image in an "images" subdirectory, which therefore has the > absolute URI "http://localhost:8080/myapp/images/logo.gif";. > >- You have Struts set up to use path based mapping to the controller > servlet, so you get URIs like "http://localhost:8080/myapp/do/getCustomer"; > in it (to execute the "getCustomer" action). > >Now, consider what happens if you have the following tag in index.jsp: > > <img src="images/logo.gif"> > >and you execute "http://localhost:8080/myapp/do/mainMenu";. This fails to >retrieve the image. Why? Because the *browser* is the one that resolves >the absolute URI of the image -- and it resolves it against the URI that >it submitted for this request: > > http://localhost:8080/myapp/do/images/logo.gif > >which is obviously wrong. Ways to get around this: > >- (Struts-specific) Use extension mapping instead of path mapping > for the controller. Then, all requests and pages are in the same > "directory level" and relative references work as expected. > >- (Struts-specific) Use the <html:base/> tag in the <head> section > of your index.jsp page. This creates an HTML <base> tag that tells > the browser to base relative references on *this* page, instead of > the request URI of the submit. > >- (Struts-specific) Use the Struts <html:img> tag instead, which knows > all about this problem and generates the correct URI automatically. > >- (General) Use a relative path like "../images/logo.gif" to convince > the browser to do the path correctly. > >- (General) Include your own <base> tag to tell the browser what the > absolute URL of this page is. > > > > > Micael > > > >Craig > > >-- >To unsubscribe: <mailto:[EMAIL PROTECTED]> >For additional commands: <mailto:[EMAIL PROTECTED]> >Troubles with the list: <mailto:[EMAIL PROTECTED]> -- To unsubscribe: <mailto:[EMAIL PROTECTED]> For additional commands: <mailto:[EMAIL PROTECTED]> Troubles with the list: <mailto:[EMAIL PROTECTED]>
![http://localhost:8080/myapp/images/logo.gif"](http://localhost:8080/myapp/images/logo.gif"){kind=link}
