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Help / WLanguage / WLanguage properties / Various properties
  • Looper, List Box, Combo Box and Table control
  • Chart control
  • Using the Empty property on a report
  • Empty property used in the arrays and in the associative arrays
  • Limits
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Stored procedures
The Empty property is used to determine if:
  • a Looper, Table, List Box or Combo Box control is empty. The control can be a browsing control or a memory control.
  • a Chart control contains no series.
  • a report control is empty (control linked to an item).
  • an array (or an associative array) contains no element.
  • an element of an associative array exists or not.
  • a queue, a list or a stack contains no element.
For a report, the Empty property is used to determine if the value of an item bound to a control has been specified for the current record.
Example
// This control becomes visible
// if the value of the item linked to the "EDT_Phone" control
// is not specified for the current record
IF EDT_Phone.Empty = False THEN
EDT_Phone.Visible = False
END
// If the "TABLE_CustomerTable" control is empty,
// add a new row into this control
IF TABLE_CustomerTable.Empty = True THEN
TableAddLine(TABLE_CustomerTable, "Davis", "Peter")
END
Syntax
<Result> = <Element used>.Empty
<Result>: Boolean
  • True if the specified element is empty,
  • False otherwise.
<Element used>: Type of element
Name of the element to be used.
Remarks

Looper, List Box, Combo Box and Table control

The Empty property is used to determine if the control is empty (the Empty property returns True).
This property applies to the Table, TreeView Table, List Box, ListView, Combo Box and Looper controls (see Limits).
Universal Windows 10 AppiPhone/iPadIOS Widget

Chart control

The Empty property is used to determine if the Chart control contains no series (the Empty property returns True).
Universal Windows 10 AppiPhone/iPadIOS Widget

Using the Empty property on a report

For a report, the Empty property is used to determine if the value of an item bound to a control has been specified for the current record.
Remark: If the value of the item linked to the specified control (for the record currently printed) corresponds to an empty string (""), this value is not considered as being empty.

Empty property used in the arrays and in the associative arrays

The Empty property is used to determine:
  • If an array or associative array is empty (Empty property returns True).
    Example:
    // Associative array of file sizes
    aaFileSize is associative array of int
    ...
    IF aaFileSize.Empty = False THEN
    Info("The array contains at least one element")
    END
  • Whether an element of an associative array exists or not. For an associative array without duplicates, the Empty property is set to False if the element exists. For an associative array with duplicates, the Empty property is set to False if at least one element exists.
    Example:
    // Associative array of integers
    // indexed on strings and with duplicates
    aaIDPerCustomer is associative array of int
    // Add the identifier of customer "A"
    aaIDPerCustomer["A"] = 55
    // Add the identifier of customer "B"
    aaIDPerCustomer["B"] = 321
     
    IF aaIDPerCustomer["A"].Empty = False THEN
    Info("At least one element A exists")
    END

Limits

Universal Windows 10 AppiPhone/iPadIOS Widget In the code of reports, the Empty property cannot be used on:
  • a report,
  • a report block,
  • a Check Box control,
  • a Shape control,
  • an Internal Report control,
  • an RTF control.
The Empty property can only be used on controls bound to an item (Calculated control, Bar Code, etc.).
WINDEV Mobile The Empty property applies only to:
  • Table (and TreeView Table) controls,
  • List Box (and ListView) controls,
  • Combo Box controls,
  • Looper controls,
  • Chart controls,
  • Array and Associative Array variables.
  • Queue, List or Stack variables.
Minimum version required
  • Version 9
This page is also available for…
Comments
Exemplo Empty
// Exemplo Empty

IF COMBO_NoName1..Empty THEN
EDT_Text1="COMBO_NoName1 Vazio"+CR
ELSE
EDT_Text1="COMBO_NoName1 Tem Dados"+CR

END
IF COMBO_NoName2..Empty THEN
EDT_Text1+="COMBO_NoName2 Vazio"+CR
ELSE
EDT_Text1+="COMBO_NoName2 Tem Dados"+CR

END
IF TABLE_Bancos..Empty THEN
EDT_Text1+="TABLE_Bancos Vazio"+CR
ELSE
EDT_Text1+="TABLE_Bancos Tem Dados"+CR
END
IF TABLE_NoName1..Empty THEN
EDT_Text1+="TABLE_NoName1 Vazio"+CR
ELSE
EDT_Text1+="TABLE_NoName1 Tem Dados"+CR
END

// Blog com Video e Exemplo

http://windevdesenvolvimento.blogspot.com.br/2016/11/aula982-dicas-009-empty.html

https://www.youtube.com/watch?v=dJzHDZ2-hD8

De matos
04 Dec. 2016

Last update: 02/02/2023

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