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How page request processing works – PB Docs 90 – PowerBuilder Library

How page request processing works – PB Docs 90

  2. Powerbuilder Documentation
  3. Powerbuilder Documentation Older
  4. Powerbuilder Documentation 9.0
  5. How page request processing works – PB Docs 90

How page request processing works

When processing a
4GL Web page, the Web Target object model (deployed with the page
to PowerDynamo) calls events for the psPage object in a specified
order. The psPage global object controls the event model and the communication
between pages.

Sequence for processing pages

When a browser requests a page, the PowerDynamo server processes
a 4GL Web page in this order:

  1. Starts page processing
    • Initializes and restores page variables and parameters
    • Creates the server object model
  2. Performs page-specific processing
    • Validates
      the page and binds input data if data is submitted to the current
      page (typically in preparation for redirection to another page)
    • Binds values for EAServer component properties
      to controls
  3. Generates the new page

The following tables summarize the processing of 4GL Web pages
and show the order in which server-side events are triggered during
that processing:

Table 9-12: Order of
events at the start of page processing
Page processing Events
Initiate page request psPage.RequestStart
First page request psPage.FirstTime
Reload page with data submitted to the reloaded
page (typically in preparation for redirection to another page)		 psPage.BeforeBinding
Table 9-13: Order of
events that perform page-specific processing
Page processing Events
A control had a specified value on request
and the value of that control changed		 control.Validate
The validation fails control.ValidationError
The validation succeeds control.ItemChanged
Data binds to component properties; sets the
value of the property of a corresponding EAServer component (for each
server object)		 none
Validate page psPage.Validate
The page or any control on the page fails validation psPage.ValidationError
Binding and validation complete psPage.AfterBinding
Page control initiates a form submit psPage.BeforeActioncontrol.ServerActionpsPage.AfterAction
For a first request or for pages that require
data binding, sets the value of the property of a corresponding EAServer component
(for each server object)		 none
Table 9-14: Order of
events that generate the new page
Page processing Events
If the script does not redirect to another page,
process the page template as before. Include other server scripts.		 psPage.BeforeGenerate
If the script does not redirect to another page,
generation is complete.		 psPage.AfterGenerate
Generation is complete. This event is always
triggered.		 psPage.RequestFinish
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Powerbuilder Documentation 9.0
PB Docs 90 Powerbuilder Documentation Powerbuilder Documentation 9.0 Powerbuilder Documentation Older Powerbuilder Web Targets Guide
August 3, 2023
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