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Populating form controls with existing data

From: ColdFusion 9 Essential Training

Video: Populating form controls with existing data

In my data entry form page, I now have two conditional logic sections. One for when the form is submitted, and one for when the page is loaded with the url.photographerid variable. The next job is to fill in form controls, so that they show either new values for an insert form or existing values for an update form. To accomplish this, I'll go to the second conditional block, the one where I've retrieved the photographer object, and I'll take each of those values and pass them to the form scope, like this.

Populating form controls with existing data

In my data entry form page, I now have two conditional logic sections. One for when the form is submitted, and one for when the page is loaded with the url.photographerid variable. The next job is to fill in form controls, so that they show either new values for an insert form or existing values for an update form. To accomplish this, I'll go to the second conditional block, the one where I've retrieved the photographer object, and I'll take each of those values and pass them to the form scope, like this.

I'll start with the firstname variable. I'll set a variable named form. firstname and I'll get its value from the method photographer.getFirstName. I'll clone that line of code 3 times, 1, 2, 3. And I'll set each of the form variables to match the name of the column. Here is the value for the lastname and I'll match the method name. I'll do the same thing for the featured column, setting a variable called form.featured and for the photographerid value I'll set a variable called form.photographerid.

That's the primary key and I'll set the value of this one from url.photographerid. So now, the form scope contains all of the values for the existing data. I am also going to add three more cfparam tags up at the top of the page. These param tags will be used to set default values if the page is loaded without the URL variable. I'll clone that line of code, holding down Ctrl+Alt on Windows or Command+Alt on Mac and pressing the Down Arrow and once again, I'll clone it three times.

For all three variables, form.firstname, form.lastname and form.photographerid, I'll set the default values to blank strings. So now the logic is if the page is loaded from scratch, the default values of the form variables will be zero for featured and blank strings for the others, but if it's loaded with the URL variable as a result of a click on an edit link, then these form variables will contain the values from the orm object. Finally, I'll fill in the values.

I'll go to each of the cfinput tags. For the text controls, firstname and lastname, I'll set a variable called value, and I'll set the value from the form variable form.firstname for the first one, and form.lastname for the second one. The checkbox control will be handled differently. The value is always set to 1. Instead you use a checked attribute to indicate whether you want the control to be checked or not.

I'll put in checked= and then a value of form.featured. This variable will have a value of 0 or 1. If the value is 0 that will equate to false, meaning the input control will not be checked. And if it's 1, it will equate to true. Finally, I need to track the primary key of the selected record, photographerid. For this, I'll use a hidden control. I'll add another cfinput tag, this one with a type of hidden.

I'll give it a name matching the primary key column name, photographerid, and I'll give it a value of form.photographerid. So now, all four of my columns are being tracked in the form. The three that are visible to the user are the firstName and lastName as text controls and the featured value as a check box. The photographerid, which is the primary key, is hidden from the user. If I load the page without passing in a photographerid URL variable, I see the default values that I created with cfparam tags at the top of the code.

One last step, I'll remove my temporary debugging code that was outputting the value of the current photographer. I'll save the change to that file and I'll reopen the index.cfm file from the Photographers folder. I'll run that and I'll click one of the edit links and I'll see the data from the selected photographer. Now this time, I'll run the page in an external browser. I'll click a link for a photographer and I see their data.

I'll go back a step, I'll click a link for another photographer and I'll see their data, and notice that the firstName, lastName and featured controls are being correctly filled in. And finally, I'll click the Insert Photographer link and that'll take me to the exact same form but with the default values displayed. I am now ready for the last bit of code in this form system, which is to provide code to update an existing photographer record.

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This video is part of

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ColdFusion 9 Essential Training

95 video lessons · 9861 viewers

David Gassner
Author

 
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  1. 5m 54s
    1. Welcome
      1m 24s
    2. Using the exercise files
      2m 50s
    3. Overview
      1m 40s
  2. 35m 16s
    1. Understanding application servers
      7m 3s
    2. Installing ColdFusion 9 on Windows
      5m 28s
    3. Installing ColdFusion 9 on Mac OS X
      6m 20s
    4. Completing the Configuration wizard
      1m 50s
    5. Starting and stopping ColdFusion on Windows
      4m 7s
    6. Starting and stopping ColdFusion on Mac OS X
      2m 37s
    7. Installing ColdFusion Builder on Windows
      4m 13s
    8. Installing ColdFusion Builder on Mac OS X
      2m 1s
    9. Setting folder permissions on Mac OS X
      1m 37s
  3. 45m 34s
    1. Using Eclipse perspectives and views
      5m 42s
    2. Defining a ColdFusion server
      8m 42s
    3. Creating a ColdFusion project
      4m 40s
    4. Creating and browsing a ColdFusion page
      5m 36s
    5. Defining a default page template
      3m 58s
    6. Setting and outputting variables
      7m 55s
    7. Using the Snippets view
      4m 49s
    8. Using an external browser
      2m 8s
    9. Using online help
      2m 4s
  4. 35m 48s
    1. Adding numbers and concatenating strings
      8m 7s
    2. Using Debug Output
      6m 10s
    3. Inspecting variables with ‹cfdump›
      4m 54s
    4. Using arrays
      5m 21s
    5. Using structures
      3m 51s
    6. Configuring the line debugger
      1m 25s
    7. Using the line debugger
      6m 0s
  5. 53m 45s
    1. Scripting an Apache Derby database
      3m 34s
    2. Defining a data source in ColdFusion Administrator
      6m 13s
    3. Exploring data sources in RDS Dataview
      4m 2s
    4. Using SQL and the ‹cfquery› tag
      6m 58s
    5. Outputting data from a query object
      4m 2s
    6. Outputting a dynamic HTML table from a query
      7m 0s
    7. Generating alternating row colors
      6m 55s
    8. Creating an application directory and home page
      5m 26s
    9. Displaying data on the home page
      5m 43s
    10. Redirecting requests with ‹cflocation›
      3m 52s
  6. 32m 17s
    1. Including pages with ‹cfinclude›
      4m 21s
    2. Creating reusable header and footer files with ‹cfinclude›
      4m 39s
    3. Creating and calling custom tags
      3m 8s
    4. Passing data into custom tags
      2m 34s
    5. Setting default values for custom tag attributes
      4m 51s
    6. Calling custom tags with ‹cfmodule›
      3m 54s
    7. Using a custom tag as a website header
      3m 55s
    8. Creating an application template file
      4m 55s
  7. 52m 6s
    1. Creating a ColdFusion Component (CFC)
      5m 6s
    2. Declaring CFC functions
      3m 28s
    3. Calling CFC methods with ‹cfinvoke›
      2m 28s
    4. Using CFC properties
      4m 51s
    5. Passing data into functions
      3m 38s
    6. Creating and calling CFCs with script syntax
      5m 25s
    7. Generating data access CFCs in ColdFusion Builder
      4m 35s
    8. Calling generated data access methods
      7m 41s
    9. Creating a dynamic HTML table from an array
      8m 8s
    10. Creating an Application.cfc file
      3m 11s
    11. Using an application data source variable
      3m 35s
  8. 32m 56s
    1. Generating an ORM map component
      7m 58s
    2. Enabling an application to use ORM
      1m 58s
    3. Retrieving data with ORM
      2m 55s
    4. Generating mappings for multiple tables
      4m 22s
    5. Filtering data with ORM
      5m 35s
    6. Displaying result data with a custom tag
      10m 8s
  9. 27m 58s
    1. Passing URL variables in hyperlinks
      6m 13s
    2. Passing multiple URL variables
      2m 50s
    3. Encoding URLs with URLEncodedFormat()
      4m 12s
    4. Checking for available variables with isDefined()
      2m 41s
    5. Creating a data-driven hyperlink
      5m 4s
    6. Displaying selected data in a detail page
      6m 58s
  10. 40m 36s
    1. Using HTML data entry forms
      6m 53s
    2. Processing form variables
      3m 24s
    3. Creating self-posting forms with ‹cfform›
      4m 40s
    4. Creating a search interface
      3m 9s
    5. Processing complex queries with HQL
      8m 53s
    6. Creating a dynamic pulldown list with ‹cfselect›
      7m 16s
    7. Displaying form results
      6m 21s
  11. 43m 46s
    1. Building a data entry form for managing data
      5m 15s
    2. Preparing an ORM mapping for inserting data
      3m 47s
    3. Inserting data with ORM
      5m 23s
    4. Retrieving data for an update form
      4m 16s
    5. Populating form controls with existing data
      5m 2s
    6. Updating data with ORM
      2m 56s
    7. Confirming actions with an Ajax message box
      7m 22s
    8. Using JavaScript callback functions
      3m 15s
    9. Deleting data with ORM
      6m 30s
  12. 9m 37s
    1. Defining client-side form validation rules
      4m 14s
    2. Validating on the server with custom CFML
      5m 23s
  13. 18m 9s
    1. Using the Application.cfc onRequest() method
      4m 12s
    2. Creating and using a login form
      4m 53s
    3. Authenticating users with ‹cflogin›
      6m 1s
    4. Logging out users
      3m 3s
  14. 7m 11s
    1. Configuring an FTP site
      2m 27s
    2. Setting a ColdFusion project's synchronization connection
      2m 17s
    3. Uploading files to the production server
      2m 27s
  15. 46s
    1. Goodbye
      46s

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