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 WINDEV, WEBDEV Y WINDEV MOBILE
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Ayuda / WLanguage / Funciones WLanguage / Controles, páginas y ventanas / Funciones List Box
  • List Boxes containing more than 10 000 elements
  • Visibility/Invisibility of elements in a List Box or Combo Box control
  • Equivalence
  • Sorted/Unsorted List Box control
  • Adding an element to the browser
  • Miscellaneous
WINDEV
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WEBDEV
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Otros
Procedimientos almacenados
Adds an element to:
  • a List Box control populated programmatically,
  • a Combo Box control populated programmatically.
Remarks:
  • To add an element at a specific position, use <List Box>.Insert.
  • <List Box>.add can be used on the single-selection and multi-selection List Box controls.
  • To add an image to a standard List Box control, use gImage.
  • To add elements to a Combo Box control found in a container column of a Table control, use Content.
WEBDEV - Código Navegador Attention: The element will only be added to the page displayed in the browser.. For more details, see Remarks.
Ejemplo
// Add the customer named "Moore" into "LIST_CustomerList"
LIST_CustomerList.Add("Moore")
WEBDEV - Código ServidorWEBDEV - Código NavegadorAjax
// Add the customers named "Clark" and "Smith" into "LIST_CustomerList"
LIST_CustomerList.Add("Clark" + CR + "Smith")
WEBDEV - Código ServidorWEBDEV - Código NavegadorAjax
// The "COMBO_Title" Combo Box displays personal titles:
// "Mister", "Madam" and "Miss".
// An integer representing a gender will be returned to the language.
COMBO_Title.Add("Mister" + gStoredValue("1"))
Sintaxis
<Control to use>.Add([<Element>])
<Control to use>: Nombre del control
Name of the control to be used.
<Element>: Cadena de caracteres opcional
Element that will be added into the specified control. If this parameter is not specified, an empty row is added into the List Box or Combo Box control.
This parameter can contain:
  • Carriage Return characters (CR) to add several elements.
  • tabs (TAB) to obtain a multi-element List Box control (see Notes).
  • gStoredValue to indicate the value that will be returned when the element is selected.
WEBDEV - Código ServidorWEBDEV - Código NavegadorPHP The Carriage Return characters (CR) are supported while the tabulations (TAB) are not supported.
WEBDEV - Código Servidor To add several consecutive spaces, use non-breaking spaces: Caract(160).
Observaciones

List Boxes containing more than 10 000 elements

The maximum number of elements contained in a List Box control is limited only by available RAM (theoretical maximum: 2 billion lines). Nevertheless, filling a List Box control with an important number of elements (more than 10 000) affects performance
To add many elements to a List Box control, it is recommended to use a List Box control based on a data file (i.e., a list directly linked to an HFSQL data file).
WEBDEV - Código ServidorAjax

Visibility/Invisibility of elements in a List Box or Combo Box control

To make an element invisible in a List Box or Combo Box control, use gStoredValue.
WEBDEV - Código ServidorWEBDEV - Código NavegadorAjax

Equivalence

The two following syntaxes are equivalent:
<Control name>.Add([<Element>])
and
<Control name>[Index] = <Element>
WEBDEV - Código ServidorWEBDEV - Código NavegadorAjax

Sorted/Unsorted List Box control

  • If the List Box control is sorted, the new element is inserted according to the sort order.
  • If the List Box control is not sorted, the new element is added at the end of the list.
The control type (sorted or not) is chosen during the control description ("Details" tab).

Use <List Box>.add rather than <List Box>.Insert to add an element to a sorted List Box control.
WEBDEV - Código Navegador The element is added at the end of control, no matter whether the List Box control is sorted or not.
WEBDEV - Código Navegador

Adding an element to the browser

When adding an element in browser code, this element is added to the page displayed in the browser only. In order for this element to be added onto the server, <List Box>.add must be run on the server.
Calling <List Box>.add in browser code is useful when using AJAX technology, in "Programmed AJAX" mode (via AJAXExecute or AJAXExecuteAsynchronous).
Reminder In "automatic and immediate AJAX" mode, simply pass the server processing containing the function <List Box>.add FUNCTION in automatic AJAX mode. That's it! No additional programming is required. For more details, see AJAX.

Miscellaneous

  • To add elements into a Table control, use <Table>.Add.
  • <List Box>.add can be used on:
    • a column of type "Combo Box" in a Table control.
    • a "Table" Combo Box control.
Componente: wd300obj.dll
Ver también
Versión mínima requerida
  • Versión 23
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Última modificación: 14/09/2024

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