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Help / WLanguage / Managing databases / HFSQL / Binding functions
  • Binding between a control and a WLanguage variable or between a control and an item of a data file
  • Updating the items: Special cases
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Stored procedures
Automatically updates:
  • the values of a data file's items in memory with the values from the controls in the window. The data file items bound to the window controls are automatically updated with the values of these controls.
  • the value of the WLanguage variables with the value of the window controls. The WLanguage variables bound to the window controls are automatically updated with the values of these controls.
Remarks:
  • <Source>.FromWindow cannot be used to write to the data file: the variables of the data file items can only be updated (i.e variables of the record loaded in memory). To modify the records, use <Source>.Add, <Source>.Modify, <Source>.Write, etc.
  • WEBDEV - Server codePHP This function is also available for WEBDEV pages. It is equivalent to <Page>.ToSource.
  • PHP Only the binding to the items of a data file is supported. Bindings to WLanguage variables are not supported in this version.
Example
// Click the "Add" button
Customer.FromWindow()
HAdd(Customer)
IF HErrorDuplicates() = True THEN Error("This number already exists")
Syntax
<Source>.FromWindow([<Window>])
<Source>: Type corresponding to the specified source
Name of the source containing the data to update. For example, this source can be:
  • The name of a data file: only the controls bound to the items of the data file are taken into account.
  • The name of a WLanguage variable: only the controls bound to the WLanguage variable are taken into account. The control will be bound to the variable data (e.g., a variable containing the name of another variable).
<Window>: Window name
Name of the window that contains the controls.
Summary: Called when a control gains focus.
Remarks

Binding between a control and a WLanguage variable or between a control and an item of a data file

The binding between a control and a WLanguage variable or between a control and an item of a data file can be determined:
  • In the editor, in the control description window ("Binding" tab).
  • Programmatically, with the DataBinding property.

Updating the items: Special cases

  • To automatically assign the NULL value to an item with <Source>.FromWindow:
    1. Check "NULL supported" for the item in the data model editor.
    2. Select the "NULL if empty" option in the Edit control bound to the item.
  • The items of the data file that are not bound to a control are not updated by <Source>.FromWindow.
  • If multiple controls in the window are bound to the same data file item, <Source>.FromWindow may not update the bound item properly. It is not recommended to bind multiple window controls to the same item.
  • <Source>.FromWindow does not update items or variables with the values from Image controls. Use the <Source>.LinkMemo function.
  • <Source>.FromWindow is not available on views.
  • Binding with "Secure Password" items: The value of the "Password" item cannot be modified until the user changes the value in the control bound to the item.
Component: wd290obj.dll
Minimum version required
  • Version 27
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Last update: 06/21/2023

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