ColdFusion 9 New Features
Illustration by Don Barnett

Using multi-file upload control


From:

ColdFusion 9 New Features

with Daniel Short

Video: Using multi-file upload control

When dealing with file uploads, there have been few options for uploading multiple files at once. You either have to add a group of individual cfinput tags for the file type and deal with each form field individually when the form is submitted or use a third-party component to try and manage the upload process. Many which are hard to use and implement. ColdFusion 9 makes one more hard thing easy by giving us a way to upload multiple files with as little as two lines of code. So, to show that, in the Chapter 8 folder, let's open cffileupload.cfm. I am just going to add one tag onto this page, cffileupload, and I'm going to tell it where to post each of the individual files that get uploaded.
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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

Using multi-file upload control

When dealing with file uploads, there have been few options for uploading multiple files at once. You either have to add a group of individual cfinput tags for the file type and deal with each form field individually when the form is submitted or use a third-party component to try and manage the upload process. Many which are hard to use and implement. ColdFusion 9 makes one more hard thing easy by giving us a way to upload multiple files with as little as two lines of code. So, to show that, in the Chapter 8 folder, let's open cffileupload.cfm. I am just going to add one tag onto this page, cffileupload, and I'm going to tell it where to post each of the individual files that get uploaded.

So, we are going to post that cffileupload-uploader.cfm. So, my uploader file is actually going to handle each of the individual form posts. So, for each file that gets uploaded, I will have one form posted at this page. On this page, I will cffile action = ,not upload, but "uploadall". In ColdFusion 8, you would have to use action = "upload" and specify the file field that you want to be uploaded. The action= "uploadall" will take any file field that gets submitted to it and save it to the disk.

So I just need to tell it where to save my file and in this case we're going to save it to the same working directory. We will just use "Expand Path ("."). That's all there is to it. Now that I've written my two lines of code, let's go to the browser and take a look at it. We will go to Chapter8, cffileupload.cfm. My cffileupload tag has embedded this nice- looking Flash control to deal with my file upload. At the top, it shows me which files are going to be uploaded and at the bottom I have a row of buttons to control everything that's going on.

So, I will click Add Files and in the Chapter8 directory, in the assets folder, I am going to choose these two images and just click Select. You can see they get added to the control. I have the File Name, the Size and a progress bar for each. So, let's click Upload and everything goes green. It says it has Uploaded 2 of 2 file(s). That happened really, really fast, because I am on a local connection. On remote connection, these bars would have obviously fill up a little bit slower. Let's go over to CF Builder and make sure that things actually worked.

If I refresh my Chapter8 folder, we can see now I have my surf_woody and surf1.tiff got successfully uploaded. There are a few more things you can do on the cffileupload control. For example, you can pass a JavaScript function that you wanted to run when it's completed processing all the files that need to be uploaded. So, for example, I could just say doneUploading. So that's the JavaScript that I want it to run and then I can say script type=text/javascript.

When it's all done, I will just have it alert us that it's done uploading. So, let's give that a try. Let's go back to the browser and Reload. We will add some new files and now I will click Upload and after it's done uploading, I get 'I am done uploading.' So I get that JavaScript alert for each file that gets finished.

So, there are a few more things you can change such as whether or not the progress bar shows, the select color. What to do if there is an error and even changing the title of upload control. But sometimes you don't want the Flash uploader. You just want to be able to deal with multiple inputs like you have traditionally. So, in that case, if we go back here, I am going to open up uploadall.cfm. Now, in this file I have my standard ColdFusion 8 way of doing things. I have two CF inputs, one named field1 and one named field2. Now at the top, I have some if statements. If field1 has a value, then run the upload and then dump the result.

If field2 has a value, run the upload and then dump its result. So, let's take a look at this one in the browser. And I will go ahead and choose surf1 for the first one and I will choose surf_woody for the second and click Upload. I need to tell it to overwrite, so let's go back in here and say when there is a name conflict, we want it to overwrite the old file.

Then we will reload our page and we can see we have our two dumps. The first one has surf1.tiff. The second has surf_woody. If I had four other file controls I wanted to add on, I don't want to have to deal with adding more and more of these. So instead, I can just do this. cffile action = "uploadall" and then I want to put the result into my UploadResult variable and then we are going to give it the same nameconflict rules which is to overwrite.

We can get rid of all of this. I will leave that one dump. So, we'll go back to our browser and just Reload. And of course, I forgot to add my destination. So let's add a destination on there. It always helps to know where you want your files to be saved. There we go. Reload once more. And now instead of two individual dumps, I get an array that contains all the information about each individual file upload, so at the first array node, I have surf1.tiff and the second array node, I have surf_woody.jpg.

While the new cffileupload tag may not suit every need for getting multiple files up to your server, it certainly goes a long way to providing a nice clean UI for uploading multiple files in one shot. But whether or not you have used the new Flash upload control, the uploadall attribute of the cffile tag is bound to cut out tons of repetitive coding.

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