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ColdFusion: Article

Test Driving ColdFusion 8

AJAX functionality combined with the simplicity of a tag-based language

(May 12, 2007) - You may have heard this before, but it's truer now than ever - it's a great time to be a ColdFusion developer. ColdFusion 8 is coming soon, and it will bring with it an array of new tags and features for developers who want to build sophisticated, feature-rich Web applications easily.

I've been busy experimenting with the ColdFusion 8 beta release from Adobe and let me assure you the software is going to have a huge impact on the RIA (rich internet application) universe and on Web application development in general. It's going to open up a world of new possibilities for every class of developer, from beginner to intermediate to master, while at the same time providing major enhancements to existing tags and features. In this article I'm going to highlight what I feel are two of ColdFusion 8's most exciting and compelling new features: AJAX components and the <CFFEED> tag. I hope that after reading this article you'll share my enthusiasm and optimism and will be looking forward to the official release of ColdFusion 8 as much as I am.

You Know It Don't Come Easy
AJAX stands for Asynchronous JavaScript and XML. It's a complex combination of HTML, CSS, JavaScript, and XML code that produces interactive and highly responsive interfaces for Web applications. If you've ever used Google Suggest in which a list of suggested search terms is displayed as you enter characters into a search box, then you've seen AJAX in action. The improved interactivity, responsiveness, and sophistication of AJAX interfaces are, in a word, remarkable. However, writing the necessary server and client-side code to make such sophisticated user interfaces possible is a difficult and time-consuming challenge, and that's putting it mildly. In fact, it's probably safe to say that only a small fraction of highly skilled developers is capable of creating an AJAX interface from scratch. However, all of this is about to change, at least for ColdFusion developers, because ColdFusion 8 will provide built-in tag-based support for AJAX components. Let me say that again: ColdFusion 8 will provide built-in tag-based support for AJAX components. This means that ColdFusion developers will be able to implement AJAX features in their applications using the CFML that we already know and love. This is very good news for those of us who don't relish the prospect of becoming intimately familiar with JavaScript, DHTML, and XML programming. For purposes of this article, the term "AJAX component" means a combination of ColdFusion tags and other markup needed to implement a specific AJAX user interface (UI). Don't confuse this term with ColdFusion components (CFCs), which enable developers to encapsulate data and business logic in separate, easily maintainable, and reusable files that have a .cfc extension.

Recently Ben Forta, Adobe's senior product evangelist for ColdFusion, posted a series of ColdFusion 8 AJAX tutorials on his Web site at www.forta.com/blog. The tutorials provide code examples and basic information on how to implement five different ColdFusion 8 AJAX components: Auto-Suggest, Live Data Grids, Partial Page Updates, Related Selects, and File System Tree Control. If you're interested in getting up to speed quickly on the AJAX features in ColdFusion 8, Ben's site is a great place to start.

After reviewing the five AJAX examples on Ben's site, I decided that my favorite (for now) is Auto-Suggest. This AJAX component augments the standard <CFINPUT> tag by adding a new auto-suggest attribute. The auto-suggest attribute accepts a comma-delimited list of values and can be populated using a database query, hard-coded values, or a CFC. In the latter case the rendered page uses ColdFusion-generated JavaScript to make asynchronous calls to a CFC that retrieves data from a database. The data is returned to the <CFINPUT> tag, which the auto-suggest attribute uses to display a list of suggested search terms. Regardless of the method used to populate the auto-suggest attribute, ColdFusion automatically generates the necessary JavaScript, CSS, and HTML code behind the scenes so that developers don't have to do it.

Of course, since this is ColdFusion I expected nothing less than this, i.e., powerful AJAX functionality combined with the simplicity of a tag-based language, and that's exactly what the Auto-Suggest AJAX component delivers. The code in Listing 1 is a simple example in which the auto-suggest attribute of the <CFINPUT> tag has been populated with hard-coded values. If you're running ColdFusion 8 yourself and want to get a firsthand look at this feature, you should be able to copy and paste the code from Listing 1 and save it as a new ColdFusion file. Figure 1 shows the suggested search terms displayed by the auto-suggest attribute as text is entered into the control.

Long Live the Grid
The Live Data Grid, a k a the HTML data grid, is an equally compelling AJAX component in ColdFusion 8 because it can substitute for cumbersome HTML tables, can be customized, and has built-in support for record paging. Dropping an HTML data grid into your application means you'll have a convenient place to deposit data for display in your application. The HTML data grid can be "pre-populated" with data or it can load data as needed by invoking a CFC that executes a database query to retrieve data asynchronously.

In either case the resulting data grid is resizable and the colors, fonts, etc. are all customizable. A user can sort the records displayed in the grid simply by clicking on a grid column header. The HTML data grid seems like a solid alternative to ColdFusion's existing Flash and Java applet-based data grids. I found it handy because it's easy to simply drop the grid into a template and load it up with data from a query. This is a good way to rapidly prototype an application because you'll have something to show users almost immediately, without having to spend a lot of time and effort coding the UI.

For the first time, ColdFusion developers will be able to implement AJAX functionality in their applications without having to write a lot of messy and tedious JavaScript, XML, and CSS code. For beginners and less experienced developers the new AJAX components can be readily deployed in applications using familiar ColdFusion tags. This means that they won't need to possess advanced knowledge of JavaScript, XML, and CSS to make AJAX work. In fact, with ColdFusion 8 it's possible to produce some stunning AJAX-type effects in ColdFusion applications with only minimal time and effort and relatively little code.

Of course, Flash forms and Flex are still available to developers in ColdFusion 8. It's just that now we have a choice between these UI solutions and AJAX. ColdFusion developers will be able to choose between a Flash-based and AJAX-based solution for their applications. This is good news because there will undoubtedly be occasions when one approach is more suitable than the other. For example, the use of AJAX on a Web site may be prohibited due to accessibility concerns, so the developer could simply go with a Flash-based solution like Flex or Flash forms which tend to be more accessible-friendly than AJAX. On the other hand, if for some reason Flash is prohibited on a company intranet then the developer could use AJAX. With ColdFusion 8's AJAX components, developers will have yet another solid UI choice for their rich applications that can be implemented both quickly and easily.

News Flash: All You Need Is CFFEED
Another exciting new feature in ColdFusion 8, and one that I've been playing around with extensively, is the <CFFEED> tag. <CFFEED> is a powerful new tag that will let developers generate and consume RSS (Really Simple Syndication) and Atom news feeds in their ColdFusion applications. RSS is an XML-based format for sharing and distributing Web content, such as news headlines. The <CFFEED> tag will let developers easily integrate RSS news feeds into their applications, generate their own feeds, or build entire applications around news feeds. ColdFusion 8's <CFFEED> tag is best demonstrated with an example. Like the AJAX components in ColdFusion 8, the <CFFEED> tag is straightforward to use. Figure 2 shows a basic application that uses the <CFFEED> tag to retrieve a news feed and a simple HTML data grid to display it. Each row in the data grid serves as a link to the full news release available on EPA's Web site. The code behind this application is shown in Listing 2.

In Listing 2 the <CFFEED> tag is used to read EPA's "Air News Releases," an RSS 2.0 news feed that is then displayed in a simple ColdFusion 8 HTML data grid. A list of EPA news feeds is available at www.epa.gov/newsroom/rssfeeds.htm. Like most RSS feeds, EPA news feeds are comprised of XML or eXtensible Markup Language. XML is markup that contains and describes data. The EPA news feed XML is "consumed" by the <CFFEED> tag and converted into a ColdFusion query that can then be used just like any other ColdFusion query. This is significant because once you've used <CFFEED> to grab an RSS feed, you can do anything you want with the query result.

For example, if you were interested in only a subset of the data retrieved by <CFFEED> you could query it again using ColdFusion's Query of Queries (QoQ) feature. This is precisely what I did in the example. After retrieving the EPA news feed with <CFFEED>, I queried the resulting query (using QoQ) and extracted just the records that I was interested in, i.e., records having EPA in the title. Remember how I said earlier that ColdFusion 8's HTML data grid provides a convenient destination for query data that you want to display? In this example the final filtered record set that I named "getFilteredRSS" is easily displayed in a simple ColdFusion 8 HTML data grid.


More Stories By Michael Markowski

Michael Markowski works for the Air Protection Division at the Environmental Protection Agency and is a Macromedia/Adobe Certified Professional.

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Most Recent Comments
Rich 11/04/07 08:33:09 AM EST

Interesting article on CF8 although not a good example from the link to the EPA site! All I got when trying was this:

The XML page cannot be displayed
Cannot view XML input using XSL style sheet. Please correct the error and then click the Refresh button, or try again later.

--------------------------------------------------------------------------------

An invalid character was found in text content. Error processing resource 'http://yosemite.epa.gov/opa/admpress.nsf/RSSByCa...

No. 07-OPA198 CHICAGO (Oct. 25, 2007) - U.S. Environmental Protection Agency recently named the Tri-Cities Wastewater Treatm...

navot 10/05/07 05:13:01 PM EDT

I would like to draw your attention to another alternative which is a paradigm shift for AJAX front ends. One should be aware that I am not, and do not pretend to be objective, never the less I believe that one can judge for himself. Visual WebGui is an open source rapid application development framework for graphic user interfaces of IT web applications. VWG replaces the obsolete paradigms of ASP.NET in both design-time and run-time which were designed for developing sites, with WinForms methodologies, which were designed for developing applications. Thus enabling designer that was designed for application interfaces (WinForms designer) instead of a word documents (ASP.NET designer). This provides the developer with an extremely efficient way to design interfaces using drag and drop instead of hand coding HTML Worth a look at www.visualwebgui.com

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