Question

thanks in advance for any input. I am using struts2 and jquery in this app.

I tried to use displaytag for pagination but my tables have images and there wasn’t a way I could make displaytag work with images.

So now I have custom coded pagination which uses <s:subset> which works great so far except that I don’t know how to make it go to another page.

Basically in <s:subset> I just want to change the start attribute and then refresh my JSP. My code evaluates the start attribute correctly with a given page number.

My s:subset tag is like below,

<s:subset source="pageableList.pagedList" count="pageableList.pageSize" start="pageableList.start"  > 
            <s:iterator> 

I think I want to use <s:url> to display my clickable page numbers but I’m having trouble there.

I have my page numbers in a list (which I evaluate in my action class right after my search completes), then in my JSP where I need to display the clickable page numbers, I iterate through the list, displaying the page numbers like below –

<s:iterator value="pageNumList" > | <a href='#'> <s:property/> </a> </s:iterator>

I guess I need to pass the clicked value of page number to the action class, then since the search results are in a list in the action class, without hitting the database again just display the results page with the new value of start attribute.

Any ideas how I might do that? I have been considering using a Decider attribute with <s:subset> but maybe there is a simpler way?

Thanks again for any input.

Regards,
veeCan

Answer 1

If you do not want to hit your DB again, cache the results of the initial query in RAM in your Action class (reference a static cache somewhere). Also, you don’t have to go with a cache-all-or-nothing approach — you can cache the first N pages and then when you near the end of the cache, fetch the rest. If you do it right, you can maintain minimum RAM footprint but preserve a snappy user experience that leverages user think time (depends on your app).