Click here to close now.

Welcome!

You will be redirected in 30 seconds or close now.

ColdFusion Authors: Yakov Fain, Maureen O'Gara, Nancy Y. Nee, Tad Anderson, Daniel Kaar

Related Topics: ColdFusion, Adobe Flex

ColdFusion: Article

Adobe Flex 2: Advanced DataGrid

Drop-in RadioButtonGroupBox; runtime computed styles vs itemRenderers; masked input and numeric input controls

In Part 1 (CFDJ, Vol. 8, issue 10) we introduced the destination-aware grid, formatters, and renderers. In this article we are continuing our discussion about datagrid renderers and...

RadioButtonGroupBox as Drop-In Renderer
We can apply similar techniques to RadioButton controls. The following code snippet suggests how the group of RadioButton controls can be used as a drop-in item renderer (and editor). Instead of an onValue/offValue pair, we are introducing an array of options (we could have gone further and upgraded <fx:options> to <fx:dataProvider>, which is similar to the ButtonBar and LinkBar controls):

<fx:DataGridColumn dataField="STATUS" width="300" headerText="Status" rendererIsEditor="true"
itemRenderer="com.theriabook.containers.RadioButtonGroupBox">
   <fx:options>
     <mx:Array id="options">
       <mx:Object data="A" label="Active"/>
       <mx:Object data="T" label="Terminated"/>
       <mx:Object data="L" label="On leave"/>
     </mx:Array>
   </fx:options>
</fx:DataGridColumn>

To support this use case, we need to build the renderer class and make the DataGridColumn pass it the array of options. The latter can be done by adding the following options setter to our DataGridColumn:

package com.theriabook.controls.dataGridClasses{
. . . . .
   public class DataGridColumn extends mx.controls.dataGridClasses.DataGridColumn {
   . . . . .
public function set options(val:Array):void {
    if (itemRenderer) UIClassFactory(itemRenderer).properties = {options:val};
    }
   }
}

Now let's build the renderer. By definition, to be an item renderer, the component has to implement the IListItemRenderer interface. To qualify as drop-in, a component has to additionally implement IDropInListItemRenderer. The Standard CheckBox implements both interfaces. Because of that, when we extended CheckBox in the previous article, we did not have to mention a single implementation and just merrily used data and listData at our convenience.

This is not the case now. Had RadioButtonGroup been at least a UIComponent, we'd need to implement the IDataRenderer and IDropInListItemRenderer interfaces and be done. But RadioButtonGroup is not even a DisplayObject, so we will base our renderer on mx.containers.Box with RadioButtonGroup embedded:

   private var group:RadioButtonGroup=null ;

   public function RadioButtonGroupBox() {
   super();
   group = new RadioButtonGroup();
}

Having RadioButtonGroup is just the beginning. Whenever our component gets assigned any options, we need to translate them into a set of RadioButton controls.

Each RadioButton will be added as a child of the renderer (container):

private var _options:Array=null;
public function set options(opt:Array):void {
   var i:int;
   . . . .
   _options=opt;
   for (i= 0; i < opt.length; i++) {
     var rb:RadioButton = new RadioButton();
     rb.label = opt[i].label;
     rb.value = opt[i].data;
     addChild(rb);
   }
}

override public function addChild(child:DisplayObject):DisplayObject {
   if (child is RadioButton) {
     (child as RadioButton).group = group;
     group.addInstance(child as RadioButton);
   }
   return super.addChild(child);
}
}

Please note how subscribing a RadioButton to the group is delegated to the overridden method addChild():

(child as RadioButton).group = group;
group.addInstance(child as RadioButton);

Had we done it directly in the options setter, there wouldn't be any need in addChild(). Why did we take the convoluted way? We did it to enable the potential use of RadioButtonGroupBox as a regular container, outside of the renderer context. In other words, no matter how a RadioButton gets added to the component - via options or not - it will get associated with the group.

Next, since we want the component to be a drop-in renderer, we need to implement the IDropInListItemRenderer interface so that the extra information about the hosting List is at our fingertips:

private var _listData:BaseListData=null;
public function get listData():BaseListData {
    return _listData;
}
public function set listData(value:BaseListData):void {
    _listData = value;
}

Once we have the listData, we can offer the following override of the data setter of IDataRenderer:

override public function set data(item:Object):void {
   super.data = item;
   if( item!=null ) {
     group.selectedValue = item[DataGridListData(listData).dataField];
   }
}

Similarly, while implementing the property value, we again consider both use cases: the standalone component and the item renderer. In case of the item renderer, our component updates the underlying data:

public function get value():Object {
   return group.selectedValue;
}
public function set value(v:Object) : void {
   group.selectedValue = v;
   if (listData) {
     data[DataGridListData(listData).dataField] = group.selectedValue;
   }
}

Finally, how about capturing the selection of a radiobutton? Since we need to listen to the change event on the RadioButtonGroup, we'll set up the listener right in the constructor method, handling the Event.CHANGE with the anonymous function:

public function RadioButtonGroupBox() {
   . . . .
   group = new RadioButtonGroup();
   group.addEventListener(Event.CHANGE,
     function event:Event):void {
     value = event.target.selectedValue;
     }
   );
}


More Stories By Victor Rasputnis

Dr. Victor Rasputnis is a Managing Principal of Farata Systems. He's responsible for providing architectural design, implementation management and mentoring to companies migrating to XML Internet technologies. He holds a PhD in computer science from the Moscow Institute of Robotics. You can reach him at [email protected]

More Stories By Yakov Fain

Yakov Fain is a co-founder of two software companies: Farata Systems and SuranceBay. He authored several technical books and lots of articles on software development. Yakov is Java Champion (https://java-champions.java.net). He leads leads Princeton Java Users Group. Two of Yakov's books will go in print this year: "Enterprise Web Development" (O'Reilly) and "Java For Kids" (No Starch Press).

More Stories By Anatole Tartakovsky

Anatole Tartakovsky is a Managing Principal of Farata Systems. He's responsible for creation of frameworks and reusable components. Anatole authored number of books and articles on AJAX, XML, Internet and client-server technologies. He holds an MS in mathematics. You can reach him at [email protected]

Comments (1) View Comments

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.


Most Recent Comments
CFDJ News Desk 12/17/06 11:15:01 PM EST

In Part 1 (CFDJ, Vol. 8, issue 10) we introduced the destination-aware grid, formatters, and renderers. In this article we are continuing our discussion about datagrid renderers and...

@ThingsExpo Stories
The enterprise market will drive IoT device adoption over the next five years. In his session at @ThingsExpo, John Greenough, an analyst at BI Intelligence, division of Business Insider, analyzed how companies will adopt IoT products and the associated cost of adopting those products. John Greenough is the lead analyst covering the Internet of Things for BI Intelligence- Business Insider’s paid research service. Numerous IoT companies have cited his analysis of the IoT. Prior to joining BI Intelligence, he worked analyzing bank technology for Corporate Insight and The Clearing House Payment...
"ciqada is a combined platform of hardware modules and server products that lets people take their existing devices or new devices and lets them be accessible over the Internet for their users," noted Geoff Engelstein of ciqada, a division of Mars International, in this SYS-CON.tv interview at @ThingsExpo, held June 9-11, 2015, at the Javits Center in New York City.
SYS-CON Events announced today that Secure Infrastructure & Services will exhibit at SYS-CON's 17th International Cloud Expo®, which will take place on November 3–5, 2015, at the Santa Clara Convention Center in Santa Clara, CA. Secure Infrastructure & Services (SIAS) is a managed services provider of cloud computing solutions for the IBM Power Systems market. The company helps mid-market firms built on IBM hardware platforms to deploy new levels of reliable and cost-effective computing and high availability solutions, leveraging the cloud and the benefits of Infrastructure-as-a-Service (IaaS...
SYS-CON Events announced today that ProfitBricks, the provider of painless cloud infrastructure, will exhibit at SYS-CON's 17th International Cloud Expo®, which will take place on November 3–5, 2015, at the Santa Clara Convention Center in Santa Clara, CA. ProfitBricks is the IaaS provider that offers a painless cloud experience for all IT users, with no learning curve. ProfitBricks boasts flexible cloud servers and networking, an integrated Data Center Designer tool for visual control over the cloud and the best price/performance value available. ProfitBricks was named one of the coolest Clo...
The 4th International Internet of @ThingsExpo, co-located with the 17th International Cloud Expo - to be held November 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA - announces that its Call for Papers is open. The Internet of Things (IoT) is the biggest idea since the creation of the Worldwide Web more than
"In the IoT space we are helping customers, mostly enterprises and industry verticals where time-to-value is critical, and we help them with the ability to do faster insights and actions using our platform so they can transform their business operations," explained Venkat Eswara, VP of Marketing at Vitria, in this SYS-CON.tv interview at @ThingsExpo, held June 9-11, 2015, at the Javits Center in New York City.
SYS-CON Events announced today that WHOA.com, an ISO 27001 Certified secure cloud computing company, participated as “Bronze Sponsor” of SYS-CON's 16th International Cloud Expo® New York, which took place June 9-11, 2015, at the Javits Center in New York City, NY. WHOA.com is a leader in next-generation, ISO 27001 Certified secure cloud solutions. WHOA.com offers a comprehensive portfolio of best-in-class cloud services for business including Infrastructure as a Service (IaaS), Secure Cloud Desktop, Cloud Storage, Disaster Recovery, Integrated Applications and Security.
SYS-CON Events announced today that Intelligent Systems Services will exhibit at the 17th International Cloud Expo®, which will take place on November 3–5, 2015, at the Santa Clara Convention Center in Santa Clara, CA. Established in 1994, Intelligent Systems Services Inc. is located near Washington, DC, with representatives and partners nationwide. ISS’s well-established track record is based on the continuous pursuit of excellence in designing, implementing and supporting nationwide clients’ mission-critical systems. ISS has completed many successful projects in Healthcare, Commercial, Manu...
The Internet of Things is not only adding billions of sensors and billions of terabytes to the Internet. It is also forcing a fundamental change in the way we envision Information Technology. For the first time, more data is being created by devices at the edge of the Internet rather than from centralized systems. What does this mean for today's IT professional? In this Power Panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, panelists addressed this very serious issue of profound change in the industry.
With major technology companies and startups seriously embracing IoT strategies, now is the perfect time to attend @ThingsExpo in Silicon Valley. Learn what is going on, contribute to the discussions, and ensure that your enterprise is as "IoT-Ready" as it can be! Internet of @ThingsExpo, taking place Nov 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 17th Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The Internet of Things (IoT) is the most profound change in personal an...
SYS-CON Events announced today that kintone has been named “Bronze Sponsor” of SYS-CON's 17th International Cloud Expo®, which will take place on November 3–5, 2015, at the Santa Clara Convention Center in Santa Clara, CA. kintone promotes cloud-based workgroup productivity, transparency and profitability with a seamless collaboration space, build your own business application (BYOA) platform, and workflow automation system.
Discussions about cloud computing are evolving into discussions about enterprise IT in general. As enterprises increasingly migrate toward their own unique clouds, new issues such as the use of containers and microservices emerge to keep things interesting. In this Power Panel at 16th Cloud Expo, moderated by Conference Chair Roger Strukhoff, panelists addressed the state of cloud computing today, and what enterprise IT professionals need to know about how the latest topics and trends affect their organization.
SYS-CON Events announced today that SoftLayer, an IBM company, has been named “Gold Sponsor” of SYS-CON's 17th International Cloud Expo®, which will take place November 3–5, 2015 at the Santa Clara Convention Center in Santa Clara, CA. SoftLayer operates a global cloud infrastructure platform built for Internet scale. With a global footprint of data centers and network points of presence, SoftLayer provides infrastructure as a service to leading-edge customers ranging from Web startups to global enterprises. SoftLayer’s modular architecture, full-featured API, and sophisticated automation pro...
17th Cloud Expo, taking place Nov 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA, will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud strategy. Meanwhile, 94% of enterprises are using some form of XaaS – software, platform, and infrastructure as a service.
SYS-CON Events announced today that CommVault has been named “Bronze Sponsor” of SYS-CON's 17th International Cloud Expo®, which will take place on November 3–5, 2015, at the Santa Clara Convention Center in Santa Clara, CA. A singular vision – a belief in a better way to address current and future data management needs – guides CommVault in the development of Singular Information Management® solutions for high-performance data protection, universal availability and simplified management of data on complex storage networks. CommVault's exclusive single-platform architecture gives companies unp...
Buzzword alert: Microservices and IoT at a DevOps conference? What could possibly go wrong? In this Power Panel at DevOps Summit, moderated by Jason Bloomberg, the leading expert on architecting agility for the enterprise and president of Intellyx, panelists peeled away the buzz and discuss the important architectural principles behind implementing IoT solutions for the enterprise. As remote IoT devices and sensors become increasingly intelligent, they become part of our distributed cloud environment, and we must architect and code accordingly. At the very least, you'll have no problem fillin...
The 17th International Cloud Expo has announced that its Call for Papers is open. 17th International Cloud Expo, to be held November 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA, brings together Cloud Computing, APM, APIs, Microservices, Security, Big Data, Internet of Things, DevOps and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding business opportunity. Submit your speaking proposal today!
The 5th International DevOps Summit, co-located with 17th International Cloud Expo – being held November 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA – announces that its Call for Papers is open. Born out of proven success in agile development, cloud computing, and process automation, DevOps is a macro trend you cannot afford to miss. From showcase success stories from early adopters and web-scale businesses, DevOps is expanding to organizations of all sizes, including the world's largest enterprises – and delivering real results. Among the proven benefits, DevOps is corr...
Internet of Things (IoT) will be a hybrid ecosystem of diverse devices and sensors collaborating with operational and enterprise systems to create the next big application. In their session at @ThingsExpo, Bramh Gupta, founder and CEO of robomq.io, and Fred Yatzeck, principal architect leading product development at robomq.io, discussed how choosing the right middleware and integration strategy from the get-go will enable IoT solution developers to adapt and grow with the industry, while at the same time reduce Time to Market (TTM) by using plug and play capabilities offered by a robust IoT ...
Today air travel is a minefield of delays, hassles and customer disappointment. Airlines struggle to revitalize the experience. GE and M2Mi will demonstrate practical examples of how IoT solutions are helping airlines bring back personalization, reduce trip time and improve reliability. In their session at @ThingsExpo, Shyam Varan Nath, Principal Architect with GE, and Dr. Sarah Cooper, M2Mi’s VP Business Development and Engineering, will explore the IoT cloud-based platform technologies driving this change including privacy controls, data transparency and integration of real time context wi...