Tuesday, January 31, 2012

Spring MVC 3.1 and JasperReports: Using iReport and AJAX (Part 4)

Review

In the previous section, we have created the Jasper report layout using iReport and learned where to place them on our Spring project. In this section, we will focus on the presentation layer and learn how to display data using HTML and jqGrid.


Presentation Layer

We will use jqGrid to display our data in an interactive table and jQuery to provide AJAX support.

What is jQuery?

jQuery is a fast and concise JavaScript Library that simplifies HTML document traversing, event handling, animating, and Ajax interactions for rapid web development. jQuery is designed to change the way that you write JavaScript.

Source: http://jquery.com/

What is jqGrid?

jqGrid is an Ajax-enabled JavaScript control that provides solutions for representing and manipulating tabular data on the web. Since the grid is a client-side solution loading data dynamically through Ajax callbacks, it can be integrated with any server-side technology, including PHP, ASP, Java Servlets, JSP, ColdFusion, and Perl.

Source: http://www.trirand.com/jqgridwiki/doku.php

Preview

We only have a single HTML file (users.jsp, a JSP to be exact) to perform all actions. This page contains our jqGrid table and buttons for downloading reports in Pdf and Excel format.

Entry page

Source

At first glance, when you look at the JavaScript code, it is somewhat intimidating, but once you've familiarized with the jqGrid syntax, you'll find that it's actually simple. If you aren't familiary with jqGrid, please visit the jqGrid Official Wiki


You might be asking: "What's that humongous lines of jibberish code?" If you'd been following my blog, you would notice that I have tackled jqGrid a couple of times from my previous tutorials. If my explanation in this tutorial isn't enough, please see the following tutorials for an alternative perspective:


An In-depth Look

If we partition this JSP page, you will notice the following sections:
  • URL imports
  • JavaScript and CSS imports
  • jqGrid initialization
  • JavaScript functions: downloadXls(), downloadPdf(), download()

    Pay attention to the download() function's algorithm:

    1. Retrieve a download token via AJAX.
    2. Store the token.
    3. Show download progress dialog box.
    4. Start actual download.
    5. Do a periodic AJAX call to verify if token still exists. If not, hide download progress box.
  • HTML table

Notice how we've separated the HTML markup from the JavaScript code. We could, of course, move that one huge JavaScript code in an external js file, and make the HTML look somewhat smaller. But I'll leave that exercise to my readers.

Next

In the next section, we will focus on the configuration files for enabling Spring MVC. Click here to proceed.
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