Welcome!

You will be redirected in 30 seconds or close now.

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

Related Topics: ColdFusion

ColdFusion: Article

Completing The Real Estate Sample Application

Managing property listings through Flash Forms PART 2

In Part 1 of this tutorial (CFDJ, Vol.7, issue 12), you built a search interface for the Real Estate sample application. In Part 2, you'll learn how to populate a form by binding the fields to a datagrid, and then edit, add, and remove records from the database. You will add functionality to the one-screen interface you started to build in Part 1 using ColdFusion and Flash Remoting.

Requirements
To complete this tutorial you will need to install the following software and files:

ColdFusion MX 7.01
For a trial download go to www.macromedia.com/cfusion/tdrc/index.cfm? product=coldfusion&promoid=devcenter_tutorial_product_090903. To buy go to www.macromedia.com/software/coldfusion/buy/ ?promoid=devcenter_tutorial_coldfusion_090903. To get the updater go to www.macromedia.com/support/coldfusion/downloads_updates.html#mx7.

To install the sample application for Part 2, unzip the files, copy the realestate folder to your Web root, create a data source called realEstate in the ColdFusion Administrator, and then browse to http://localhost/realestate/index.cfm or http://localhost:8500/realestate for ColdFusion standalone installations. See the full instructions in the Readme file.

Prerequisite Knowledge

  • Part 1 of this tutorial
  • Basic knowledge of ColdFusion components and Flash Forms
  • Ability to set up a data source and write simple SQL statements
Completing the Real Estate Management System Sample Application
In this tutorial, you'll populate the Add/Edit panel with the record details for the user's search so that the user can edit, remove, and add new records from the same panel (see Figure 1).

Code the following functionality:

  1. Populate the edit form by binding fields to the selected record in the datagrid.
  2. Create a ColdFusion component to add, update, and delete records from the database.
  3. Create a Flash Remoting service CFC.
  4. Call the service and get results.
Populating the Edit Form
The bottom-right panel contains a form with an input for every attribute of a property listing: address, price, number of bedrooms, bathrooms, amenities, and so forth. Most of the fields are text input fields, but there are also controls for selects, radio buttons, check boxes, a text area, and a date field.

When a user opens the application (you can try it by going to http://localhost:8500/realestate/index.cfm), he or she selects search criteria and the application returns the search results. The user clicks one of the records in the datagrid and expects the detail panel in the bottom-right corner to display the details of the selected record. Where will the necessary information come from?

In Part 1 of this tutorial, the search returned query results that contained all of the columns in the "listing" table in the database. However, only a few of those columns - namely Price, Type, Bedrooms, Bathrooms, and Footage - appeared in the datagrid.

"What a waste of bandwidth!" you may have thought. Not really so, because you will need the additional columns to populate the entire form.

Populate each field from a column of the query returned by the search. The query that populates the datagrid is "stored" in the datagrid. To get the data corresponding to the selected row in the grid, access the cfgrid by its name (listingGrid) and its special property (selectedItem); the name and property specify the row the user selected.

Then, with dot notation, select the specific column you need, which is different for each input. The complete path is this: listingGrid.selectedItem.columnName. Use this path for all of the columns of the query, even if they were not defined as datagrid columns with the cfgridcolumn tag.

Binding Each Field Type
Now that you know how to get the data for each property listing attribute, you are ready to display it. Just below the search results, add a new panel (note that Part 1's sample files already contain this panel) that contains the add/edit form:

<cfformgroup type="panel" label="Add / Edit Properties">
</cfformgroup>

Within this panel, you will add, one by one, all the fields corresponding to each property listing attribute, such as address, number of bedrooms, and so forth. Each field has a different length or type, so you will use different controls or variations of the same controls as user inputs. There are some differences in the way you populate each control.

Populating text input controls (<cfinput type="text">), textarea controls (<cftextarea>) and datefield controls (<cfinput type="datefield">) is straightforward if you simply use their bind property:

bind="{listingGrid.selectedItem.columnName}"

Checkbox values can be true or false. The column that populates the checkbox control must be a Boolean type so that you can write:

value="{listingGrid.selectedItem.columnName}"

Select and radio button controls are a different challenge. Neither of them have a bind or similar attribute that you can use to bind them directly. Instead, you must make the controls acquire the right choice when the selected record in the datagrid changes.

In ActionScript, controls fire events when certain things happen. For example, the datagrid fires an onChange event each time the user selects an item. You can make your cfgrid call a function or run a piece of ActionScript code every time that event fires. To tell the datagrid what to do in that event, use the onChange attribute:

<cfgrid name="listingGrid" onchange="listingGridChanged()">

You can call any function you want, either a built-in function such as alert('Datagrid selection changed!') or a custom function.

If you choose to call a custom function, such as listingGridChanged(), you must declare it in a <cfformitem type="script"> block:

<cfformitem type="script">
public function listingGridChanged():Void {
     //select item in dropdowns
     //select item in radio button group
}
</cfformitem>

To avoid repeating the same code for every select control, create a helper function to select a specific item in the select control. This function looks for the option value that matches the desired item and then selects it:

public function selectOption(select: mx.controls.ComboBox, optionToSelect:String):Void {

    //go through every record to find the right one
    for (var i:Number = 0; i< select.length; i++) {
      if (select.getItemAt([i]).data == optionToSelect){
        select.selectedIndex = i;
        break;
      }
    }
}

More Stories By Nahuel Foronda

Nahuel Foronda is one of the founders of Blue Instant (http://www.blueinstant.com), a web development firm specializing in Rich Internet Applications where he has been creating award-winning applications and offering training for the last five years. He also maintains a blog, called AS Fusion (http://www.asfusion.com), where he writes about Flash, ColdFusion and other web technologies.

More Stories By Laura Arguello

Laura Arguello is one of the founders of Blue Instant (http://www.blueinstant.com), a web development firm specializing in Rich Internet Applications where she has been creating award-winning applications and offering training for the last five years. She also maintains a blog, called AS Fusion (http://www.asfusion.com), where she writes about Flash, ColdFusion and other web technologies.

Comments (0)

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.


@ThingsExpo Stories
SYS-CON Events announced today that CollabNet, a global leader in enterprise software development, release automation and DevOps solutions, will be a Bronze Sponsor of SYS-CON's 20th International Cloud Expo®, taking place from June 6-8, 2017, at the Javits Center in New York City, NY. CollabNet offers a broad range of solutions with the mission of helping modern organizations deliver quality software at speed. The company’s latest innovation, the DevOps Lifecycle Manager (DLM), supports Value S...
The Internet of Things is clearly many things: data collection and analytics, wearables, Smart Grids and Smart Cities, the Industrial Internet, and more. Cool platforms like Arduino, Raspberry Pi, Intel's Galileo and Edison, and a diverse world of sensors are making the IoT a great toy box for developers in all these areas. In this Power Panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, panelists discussed what things are the most important, which will have the most profound e...
Multiple data types are pouring into IoT deployments. Data is coming in small packages as well as enormous files and data streams of many sizes. Widespread use of mobile devices adds to the total. In this power panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, panelists will look at the tools and environments that are being put to use in IoT deployments, as well as the team skills a modern enterprise IT shop needs to keep things running, get a handle on all this data, and deli...
The explosion of new web/cloud/IoT-based applications and the data they generate are transforming our world right before our eyes. In this rush to adopt these new technologies, organizations are often ignoring fundamental questions concerning who owns the data and failing to ask for permission to conduct invasive surveillance of their customers. Organizations that are not transparent about how their systems gather data telemetry without offering shared data ownership risk product rejection, regu...
SYS-CON Events announced today that Grape Up will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct. 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Grape Up is a software company specializing in cloud native application development and professional services related to Cloud Foundry PaaS. With five expert teams that operate in various sectors of the market across the U.S. and Europe, Grape Up works with a variety of customers from emergi...
The age of Digital Disruption is evolving into the next era – Digital Cohesion, an age in which applications securely self-assemble and deliver predictive services that continuously adapt to user behavior. Information from devices, sensors and applications around us will drive services seamlessly across mobile and fixed devices/infrastructure. This evolution is happening now in software defined services and secure networking. Four key drivers – Performance, Economics, Interoperability and Trust ...
@ThingsExpo has been named the Most Influential ‘Smart Cities - IIoT' Account and @BigDataExpo has been named fourteenth by Right Relevance (RR), which provides curated information and intelligence on approximately 50,000 topics. In addition, Right Relevance provides an Insights offering that combines the above Topics and Influencers information with real time conversations to provide actionable intelligence with visualizations to enable decision making. The Insights service is applicable to eve...
DevOps is often described as a combination of technology and culture. Without both, DevOps isn't complete. However, applying the culture to outdated technology is a recipe for disaster; as response times grow and connections between teams are delayed by technology, the culture will die. A Nutanix Enterprise Cloud has many benefits that provide the needed base for a true DevOps paradigm.
Cybersecurity is a critical component of software development in many industries including medical devices. However, code is not always written to be robust or secure from the unknown or the unexpected. This gap can make medical devices susceptible to cybersecurity attacks ranging from compromised personal health information to life-sustaining treatment. In his session at @ThingsExpo, Clark Fortney, Software Engineer at Battelle, will discuss how programming oversight using key methods can incre...
Most technology leaders, contemporary and from the hardware era, are reshaping their businesses to do software in the hope of capturing value in IoT. Although IoT is relatively new in the market, it has already gone through many promotional terms such as IoE, IoX, SDX, Edge/Fog, Mist Compute, etc. Ultimately, irrespective of the name, it is about deriving value from independent software assets participating in an ecosystem as one comprehensive solution.
The 20th International Cloud Expo has announced that its Call for Papers is open. Cloud Expo, to be held June 6-8, 2017, at the Javits Center in New York City, brings together Cloud Computing, Big Data, Internet of Things, DevOps, Containers, Microservices 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 ...
SYS-CON Events announced today that Juniper Networks (NYSE: JNPR), an industry leader in automated, scalable and secure networks, will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Juniper Networks challenges the status quo with products, solutions and services that transform the economics of networking. The company co-innovates with customers and partners to deliver automated, scalable and secure network...
New competitors, disruptive technologies, and growing expectations are pushing every business to both adopt and deliver new digital services. This ‘Digital Transformation’ demands rapid delivery and continuous iteration of new competitive services via multiple channels, which in turn demands new service delivery techniques – including DevOps. In this power panel at @DevOpsSummit 20th Cloud Expo, moderated by DevOps Conference Co-Chair Andi Mann, panelists will examine how DevOps helps to meet th...
SYS-CON Events announced today that Hitachi, the leading provider the Internet of Things and Digital Transformation, will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Hitachi Data Systems, a wholly owned subsidiary of Hitachi, Ltd., offers an integrated portfolio of services and solutions that enable digital transformation through enhanced data management, governance, mobility and analytics. We help globa...
SYS-CON Events announced today that T-Mobile will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. As America's Un-carrier, T-Mobile US, Inc., is redefining the way consumers and businesses buy wireless services through leading product and service innovation. The Company's advanced nationwide 4G LTE network delivers outstanding wireless experiences to 67.4 million customers who are unwilling to compromise on ...
Five years ago development was seen as a dead-end career, now it’s anything but – with an explosion in mobile and IoT initiatives increasing the demand for skilled engineers. But apart from having a ready supply of great coders, what constitutes true ‘DevOps Royalty’? It’ll be the ability to craft resilient architectures, supportability, security everywhere across the software lifecycle. In his keynote at @DevOpsSummit at 20th Cloud Expo, Jeffrey Scheaffer, GM and SVP, Continuous Delivery Busine...
20th Cloud Expo, taking place June 6-8, 2017, at the Javits Center in New York City, NY, 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.
With major technology companies and startups seriously embracing IoT strategies, now is the perfect time to attend @ThingsExpo 2016 in New York. 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 June 6-8, 2017, at the Javits Center in New York City, New York, is co-located with 20th Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry p...
With major technology companies and startups seriously embracing Cloud strategies, now is the perfect time to attend @CloudExpo | @ThingsExpo, June 6-8, 2017, at the Javits Center in New York City, NY and October 31 - November 2, 2017, Santa Clara Convention Center, CA. Learn what is going on, contribute to the discussions, and ensure that your enterprise is on the right path to Digital Transformation.
SYS-CON Events announced today that SoftLayer, an IBM Company, has been named “Gold Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2016, at the Javits Center in New York, New York. SoftLayer, an IBM Company, provides cloud infrastructure as a service from a growing number of data centers and network points of presence around the world. SoftLayer’s customers range from Web startups to global enterprises.