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Passing Parameters In A Data Table Using JSF

Some working knowledge of J2EE or JSF is assumed for this article.

Like some of you I've been frustrated with this technology known as JSF or Java Server Faces. There are several different flavors out there that are built on the shoulders of JSF. For instance Oracle's ADF (Application Development Framework). Oracle ADF Faces Components is a set of over a 100 JSF components that let you build a richer user interface for your Java EE applications. Oracle ADF Faces also includes many of the framework features most needed by JSF developers today.

That is great, and in many ways it will make life easier to develop in a JSF environment. Some items you will find available in these "add on" packages have a real benefit. For instance, as of the date of this article, I was very surprised that a File Upload is a feature still not implemented in JSF in respect to using natural jsf tags. There are ways to accomplish this task in JSF but they are not native JSF approaches. The process is a "no brainer" in just about every other framework available today, including asp.net.

Another simple task (I thought) was having a data table present the results of a query in an editable format. Possibly to update a user record or shopping cart. After working in other technologies it was very efficient to return a result set to a data table object and let that object take care of some of the trivial behaviors and characteristics of the table itself. When I started exploring JSF I was frequently and at every turn becoming more and more frustrated in trying to duplicate some of the most basic of processes similar to managing records through data tables.

There are not a whole lot of resources out there yet on JSF although it is growing steadily, and I found that all too often the resources that I was finding on the internet either didn't apply to the more simple tasks or the information was just completely wrong. One example of that was that it was stated in one article I read that you cannot use command buttons inside of a JSF data table. The recommendation was to use JSF hyperlinks instead when trying to perform an action from a data table due to a bug in the framework that prevented command button actions to fire if the button resided inside of a data table.

At first I thought "you've got to be kidding me"! Then I remembered that I've been finding a fair amount of "bogus" information in regards to JSF development so I decided to do further research and discovered that information to be less than accurate as well.

I simply had to find a way to populate a data table through a result set and get a command button to fire an action and pass all of the data in the data table to the backing bean to update the record. Multiple command buttons would exist as well as hidden fields pertaining to id numbers and so forth. Pretty basic stuff and we've all done it before with relative ease.

It turned out that the solution was in fact a simple one. "Binding". You've heard about it and read about it. But this approach was something a little different as far as I could find.

Many of the blogs and articles that I read dealt with passing the values as parameters and following the steps to define the parameters in faces.config files etc., then retrieving the parameters in a backing bean. Processing the passed data required another set of procedures to utilize mapping to each of the field parameters passed and then processing could begin.

That seemed like a whole heck of a lot to me just to retrieve form data. Then it occurred to me that I should be able to "bind" a text field component on a page to a backing bean. Once it is bound then all I have to do is extract the data. And that's all there is to it. My query returned results and pre-populated a data table including text fields with the values of the query pre-populated in the text fields.

Each one of those text fields was bound to a "HtmlInputText" type in my backing bean. It was not a String type like other approaches define. Doing that does require you to map parameters and populate that String variable through your set methods once the form is submitted.

What I found is that if I bind my text field to a property of text field type that it solved my problem of passing values from a data table, and I didn't have to define parameter fields anywhere in any xml file. Now that I had that figured that out I needed to figure out how to get the value of that property that I've bound my form field to, well why not getValue()?

I personally hadn't seen any examples online or in books for retrieving the value from a form binding it to the type of form element it was and simply use the getValue() to pull out the value of the object. Used like this getParameterFromForm().getValue().

Let me clarify that I am NOT saying that trying this approach isn't documented anywhere, I find it hard to believe that I've had some stroke of genius that no one has had before in the world of java, especially since I'm coming from .NET and ColdFusion.

After doing that I no longer had any problems passing form data to my backing bean. I was able to dynamically populate data tables with any number of records including any number of command buttons within that data table and I didn't have to concern myself with remembering to define parameters in any other areas of the application.

So put simply you can bind your form fields to properties of the same type in your backing bean, and then extract the value of that object using getValue() if you prefer over utilizing parameter string mapping and similar approaches for processing form data. I found it to be easier and less time consuming which has costs associated to it as well.

Ben Cortese is a developer and business analyst for the financial industry.

Copyright 2008. Article can be reprinted as long as author credits are given and content remains unchanged and intact.

 


How To Create A Powerful Website

So you're considering building a website and you may be feeling a little overwhelmed by it all. While this can easily happen it is wise to whip out some note paper and write down exactly what you want to achieve and what steps you need to take in order to get there.

So the first thing you are going to need to do is put the foundation in place. This will require extensive research. Now contrary to popular opinion I start this process a little bit differently than what is generally advised.

Now while we all know that you need to find a hungry market doing this can be a little more difficult than explained in actual fact that is just like everything else when it comes to doing anything online.

Actuality can be quite different from theory. So what I do is visit the article directories. I punch in a keyword that I am interested in and see what articles come up relative to that. Then I check the articles out to see how many page views they have received over a given period of time.

If an article receives a lot of page views then I know that there are a number of people looking for information relative to this subject. I also know that if I write an article on this topic that it will receive a lot of page views and as a result get a lot of click throughs to my site which will help me get traffic quickly without having to worry about what Google and everyone else does.

Next I visit the forums to see what solutions are being discussed then I go back to the articles and check what the writers are promoting and see if it is a valid good product to help people achieve the goals they desire. If so then I make note of it. Now I feel a little more confident about building a site around this theme.

The next thing you have to consider is the domain. A keyword in the domain is helpful but not essential. Your next quest is hosting. You need a good host as this is your life line.

Finally you want to be able to build the site effectively so as to achieve good search engine rankings. Keyword research relative to your overall theme will help you to do this plus you need to structure the pages properly so that you site can be understood by the search engines.

Do not worry if you lack technical knowledge as there are site builders out there to help you overcome this challenge.

Select any of the following links to watch some free videos.

Watch These Free Videos At Site Build It Customer Reviews please allow time for the videos to load.

Learn how to publish a real website That works Site Build It Review. Sign Up for the free affiliates masters course.

http://www.lfdab.com/Site-Build-It-Customer-Reviews.php

 


How To Make A Real Money Making Website

I think we would all like to make money online. The notion of making money from home is a popular one. To be able to have money passively coming in day in and day out would be wonderful. However theory can be very different from actuality.

The goal of this article is to improve your odds of success. When it comes to building any website you need to understand the core principles. A good website will provide value to its visitors.

To provide such value you need to offer good content. Good content is king in the online hierarchy. In order to provide good content you need to do quality research. By the way quality research will become your daily routine.

The question is where to start so as to get positive results. The two places I always begin with are the article directories and forums. Both of these provide information relative to demand and interest.

The article directories will tell you how popular a topic is based upon the number of page views any given article receives on any given subject. The forums will tell you what people are looking for relative to this and the level of interest.

This will also enable you to understand how to communicate directly to these folks based upon their specific needs and problems. You need to be able to relate in order to communicate effectively.

Effective communication will lead to building long lasting relationships which will be profitable for all parties concerned.

Once you have this information you will need a good site builder so that you can build valid web pages that can be understood by both your human readers and the search engines. This way your site will appear in the search engines for any given keyword you choose to come up for.

This will bring lots of quality targeted traffic that will convert to sales and as a result you will make money day in and day out.

To learn how to put all this together select any of the links provided.

Watch These Free Videos At Site Build It Customer Reviews please allow time for the videos to load.

Learn how to publish a real website That works Site Build It Review Sign Up for the free affiliates masters course.

http://www.lfdab.com/Site-Build-It-Customer-Reviews.php

 


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