Data Controllers / Data Fields / Text Mode

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Password

Some applications require protected input of sensitive field values. Examples include a user password, social security number, or national id.

Let’s configure a Social Security Number field on the Employees table. Start SQL Server Management Studio. In the Object Explorer, right-click on Databases / Northwind / Tables / dbo.Employees node. Select Design option.

Design option for Employees table of Northwind database.

Add the following column:

Column Name Data Type Allow Nulls
SocialSecurityNumber nvarchar(50) True

Save your changes and refresh the Employees data controller.

Generate the project. Navigate to the Employees page and edit a record. Change the Social Security Number field value and save. The field value is visible and unprotected.

Social Security number field value is displayed to the user.

Start the Project Designer. In the Project Explorer, double-click on Employees / container1 / view1 / editForm1 / c1 – Employees / SocialSecurityNumber data field node.

SocialSecurityNumber data field in editForm1 view on the Employees page.

Change the properties of the data field:

Property New Value
Columns 10
Text Mode Password

Press OK to save. On the toolbar, press Browse.

When the web app opens in the browser, navigate to Employees and select a record. The field value will be presented to the user as a series of asterisks (*).

When the form is in read mode, the password field is rendered as a series of asterisks.

Edit the record. The field value will be displayed as dots, and cannot be copied or otherwise extracted.

When form is in edit mode, the password field is rendered as a series of dots.

This solution is effective in preserving the confidentiality of the information.

A common practice is to reveal a part of the protected information. It may be necessary to reveal the last four digits of the Social Security Number.

Switch back to the Project Designer. In the Project Explorer, switch to the Controllers tab. Right-click on Employees / Fields node and select New Field.

Create New Field in Employees controller.

Configure the field using the following values:

Property Value
Name SocialSecurity4Digit
Type String
Length 50
Allow null values. True
The value of this field is computed at run-time by SQL expression True
SQL Formula
'***-**-' + SUBSTRING(Employees.SocialSecurityNumber, 
(LEN(Employees.SocialSecurityNumber)-3), 
LEN(Employees.SocialSecurityNumber))
Label Social Security Number
Values of this field cannot be edited True

Press OK to save the new field.

The SocialSecurity4Digit field should be visible when the form is in read mode while the SocialSecurityNumber field should not be displayed. In edit mode, the visibility of the fields will be reversed.

In the Project Explorer, right-click on Employees / Views / editForm1 / c1 – Employees category node, and select New Data Field option.

Add New Data Fields in editForm1 view of Employees controller.

Use the following configuration:

Property Value
Field Name SocialSecurity4Digit
Visible When
this.get_isEditing() == false

Press OK to save the data field.

In the Project Explorer, double-click on Employees / Views / editForm1 / c1 – Employees / SocialSecurityNumber data field node.

SocialSecurityNumber data field in editForm1 of Employees controller.

Add the following Visible When expression:

Property Value
Visible When
this.get_isEditing() == true

Press OK to save the data field.

On the toolbar, press Browse. Navigate to the Employees page and select a record.

The field SocialSecurity4Digit is displayed when the form is in read mode.

Four digits of the Social Security Number are displayed when the form is in read mode.

The field SocialSecurityNumber is displayed when the form enters edit mode.

The encrypted field is editable when the form is in edit mode.

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