Page triggers are used to change the way page data is presented to the user. In this recipe, we will use triggers to calculate a value that will be displayed in the page "on-the-fly", when a record in retrieved from the database. Besides, trigger code will update the style of text boxes depending on the data displayed in them.
To illustrate the data presentation in a page, we write page trigger code highlighting expired certificates to draw user's attention to entries demanding immediate action.
Open the page 50010 Item Certificate Card in page designer. Declare a global variable
ExpirationDateof the Date type.Insert a new field in the General group, just below the field Issued Date. Set SourceExpr = ExpirationDate to make the
ExpirationDatevariable as the data source for the new field.Open the C/AL Code page. Declare a function
GetCertificateExpirationDate.Open function parameters and add one parameter:
Name
DataType
Length
CertificateNo...