ColdFusion 9 New Features
Illustration by Don Barnett

Building a progress indicator


From:

ColdFusion 9 New Features

with Daniel Short

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Video: Building a progress indicator

I have used a number of third-party components and animated gifs in the past to create "progress bars" in my web applications. ColdFusion 9 adds a new cfprogressbar tag that let's you easily drop a progress bar on to your page and either manage it manually through JavaScript or bind it to the result of a CFC to give your users more information about exactly what's happening in your application. So, I'm in the Chapter8 folder, let's open up progress.cfm and here I just have a simple cfprogressbar tag.
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  1. 4m 30s
    1. Welcome
      53s
    2. Using the exercise files
      3m 37s
  2. 7m 49s
    1. Adding managing and comparing servers
      5m 26s
    2. Monitoring server health
      2m 23s
  3. 22m 10s
    1. Setting the default data source and SMTP
      5m 6s
    2. Getting programmatic debugging and exception handling
      5m 54s
    3. Reviewing the new onCFCRequest method
      5m 29s
    4. Using ApplicationStop()
      2m 24s
    5. Working with Server.cfc and onServerStart
      3m 17s
  4. 17m 45s
    1. Using ternary and chained operations
      5m 46s
    2. Using New and Import
      4m 2s
    3. Reviewing CFScript enhancements
      7m 57s
  5. 20m 23s
    1. Building with implicit getters and setters
      4m 26s
    2. Working with LOCAL scope in functions
      4m 35s
    3. Serializing objects
      6m 6s
    4. Writing components in CFScript
      5m 16s
  6. 19m 27s
    1. Getting started with ORM
      5m 51s
    2. Logging ORM activity
      2m 13s
    3. Saving objects to the database
      6m 10s
    4. Defining table relationships
      5m 13s
  7. 16m 59s
    1. Caching page fragments
      5m 29s
    2. Managing the cache
      4m 48s
    3. Working with in-memory files using VFS (RAM disks)
      6m 42s
  8. 12m 39s
    1. Working with Excel spreadsheets
      4m 56s
    2. Working with Word documents
      4m 4s
    3. Working with PowerPoint presentations
      3m 39s
  9. 28m 59s
    1. Loading Google maps with markers onto a page
      4m 53s
    2. Adding a Flash movie with the built-in FLV player
      2m 14s
    3. Using multi-file upload control
      6m 7s
    4. Building a progress indicator
      3m 37s
    5. Working with accordion layouts
      3m 19s
    6. Showing information with data grid enhancements
      5m 1s
    7. Informing users with Confirm Alert and Prompt dialog boxes
      3m 48s
  10. 9m 8s
    1. Accessing IMAP accounts
      6m 31s
    2. Working with the new array functions
      2m 37s
  11. 15s
    1. Goodbye
      15s

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Watch the Online Video Course ColdFusion 9 New Features
2h 40m Intermediate Oct 05, 2009

Viewers: in countries Watching now:

In ColdFusion 9 New Features, author and developer Dan Short has gathered together the important updates and improvements in this dynamic web application. Dan showcases the new ColdFusion Builder application throughout the course, using it to work through the new language and CFScript enhancements in this release. He shows how to use the new Server Manager to compare servers and create server groups, as well as monitor server health through notifications. He also explains the new integration with Office applications, building Excel, Word, and even PowerPoint files on the fly from ColdFusion. Finally, he covers the important new Object Relational Mapping feature and how to use the built-in Flash Player. Exercise files accompany this course.

Topics include:
  • Using new implicit Getters and Setters in ColdFusion Builder
  • Utilizing RAM disks using VFS
  • Managing the system cache to boost site/application performance
  • Learning the new ternary and chained operations
  • Loading detailed Google maps with markers and notations onto a web page
Subjects:
Developer Web
Software:
ColdFusion
Author:
Daniel Short

Building a progress indicator

I have used a number of third-party components and animated gifs in the past to create "progress bars" in my web applications. ColdFusion 9 adds a new cfprogressbar tag that let's you easily drop a progress bar on to your page and either manage it manually through JavaScript or bind it to the result of a CFC to give your users more information about exactly what's happening in your application. So, I'm in the Chapter8 folder, let's open up progress.cfm and here I just have a simple cfprogressbar tag.

I have given it a name, so I can reference it in my JavaScript and I have set a duration in milliseconds. So, this progress bar will take 10 seconds to go from start to finish. Now, I have created two JavaScript functions. The first is startProgress; the second is stopProgress. And all those do is call ColdFusion. ProgressBar.start and then I pass in the ID to my progress bar and .stop. So, let's a take a look at this in the browser. So, here you can see I have a gray bar at the top that simply shows where my progress bar is going to be.

And then I can click Start Progress and it will start. I can click Stop and it will stop. And that's all you need to do in order to actually manage your progress bar from the client side perspective. But usually, when you want to use a progress bar, there is something going on the server. So, let's go back to CF Builder and I have a cfc here called StatusCheck. In my StatusCheck.cfc, I am going to increase the percentage of completion on my progress bar for each time the cfc gets called.

So, what I am doing is setting a value in Session that determines how far along we are in the progress. So, each time this getStatus function gets called, I am going to increase the progress by .1. Then down here at the bottom, I am going to set a status message depending on the value of my Status. So, if I am less than or equal to 20% done, I am going to show Starting. If I am more than a quarter percent done, I will say quarter finished, .5 half finished, 0.75 three quarters finished and when my Status is finally equal to 1, I'll show that we're actually finished with the progress bar and then I'll delete that value from the session, so that it's good to go on the next round.

So, back in progress.cfm, I am going to bind the results of my progress bar to that cfc. So, I'll type bind=cfc, and we are going to go to Chapter8.cfcs.StatusCheck.getStatus and instead of a duration, because we don't know how long this is going to take, we are going to say check the status of that cfc every 500 milliseconds or half a second. So, let's go back to the browser and reload. So, it now has my new bind attribute on it and I'll click Start Progress and you can see here it's actually showing me how far along I am in the process.

When it's all done, it says finished. So, when you bind a cfc to the CF progress bar, you need to return two things. You need to return the Status value, a value somewhere between 0 and 1 that determines the percentage of completion, and a message if you want a message to be displayed inside of the status bar. There are a few more customizations you can make around colors and background images, but the takeaway here is that you now have a quick and easy way to add a progress bar to any long-running process in your application, with just a few lines of code.

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