How do I append query string to url from a JSP?

Question

I got a page with comments. I want the user to be able to sort those comments by oldest or newest by clicking on a link that show up in the comment section.

I am already preprocessing views via the url. So when the user browses to book?id=20 it shows the book with the id of 20 from the database.

Going directly to book?id=20&sort=oldest already works. How do I get my JSP to append to the URL upon clicking?

The problem im having is that I can't hardcode them in: for example, if I just coded in <a href="book?id=${param.id}&show=newest">Newest</a> it will disrupt other query strings. What if the user is already at the URL book?id=20&stars=5 (shows comments with the rating of 5 stars).

I'd like the JSP to just append onto the URL so that it includes any current queries, so for example: user is at currently at book?id=20&stars=5, user then clicks sort by oldest, then the JSP appends &sort=oldest making it book?id=20&stars=5&sort=oldest.

Paul Vargas · Accepted Answer · 2012-05-03 00:42:10Z

1

You can do it with something like that:

<a href="book?id=${param.id}&show=newest" onclick="this.href=this.href+'&sort=oldest'">Newest</a>

answered May 3, 2012 at 0:42

Paul Vargas

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