Help / WLanguage / WLanguage functions / Controls, pages and windows / List Box functions
  • Multi-selection List Box control
  • Modified element
  • Modifying an element in the browser
  • Miscellaneous
WindowsLinuxUniversal Windows 10 AppJavaReports and QueriesUser code (UMC)
WindowsLinuxPHPWEBDEV - Browser code
AndroidAndroid Widget iPhone/iPadIOS WidgetApple WatchMac CatalystUniversal Windows 10 App
Stored procedures
Modifies an element in a List Box, ListView or Combo Box control populated programmatically.
Remark: <List Box>.Modify can be used on the single-selection and multi-selection List Box controls.
WEBDEV - Browser code Caution: The element will be modified on the page displayed in the browser only. For more details, see Remarks.
// Modify the element found at subscript 4 in "LIST_CustomerList"
LIST_CustomerList.Modify("Smith", 4)
WINDEVReports and QueriesUser code (UMC)
// Modify the image found at subscript 4 in "LSV_Diving"
LSV_Diving.Modify("Coral Reef", "C:\MyImages\CoralReef.JPG", 4)
<List Box control>.Modify(<Element> [, <Image> [, <Element index>]])
<List Box control>: Control name
<Element>: Character string
Element to modify in the specified List Box (or Combo Box) control.
WINDEVJava For a ListView control, this parameter corresponds to the image caption.
WEBDEV - Server codeWEBDEV - Browser codePHP The Carriage Return characters (CR) and the tabulations (TAB) are not supported.
WEBDEV - Server code To add several consecutive spaces, non-breakable space characters must be used: Charact(160).
<Image>: Optional character string
Name and path of image that will be added into a ListView control. This parameter is taken into account for ListView controls displayed in ListView mode only.
If this parameter is not specified, the default image (defined in the "Details" tab in the description window of control) will be used.
WEBDEV - Server codeWEBDEV - Browser codeUniversal Windows 10 AppAndroidiPhone/iPadPHP This parameter is not available.
<Element index>: Optional integer
Index of the element to be modified.
If this parameter:
  • is not specified or if it is set to -1, the current element is modified. <List Box>.Modify has no effect if there is no current element.
  • is equal to 0, the first element is modified.
  • is greater than the number of elements found in the List Box (or Combo Box) control, a WLanguage error occurs. The number of elements in a List Box (or Combo Box) control is returned by <List Box>.Count.
PHP <List Box>.Modify has no effect if this parameter is equal to 0 or if it is greater than the number of elements found in the List Box (or Combo Box) control.

Multi-selection List Box control

If one or more elements are selected in the List Box control, <List Box>.Modify deselects no element.
WINDEVWEBDEV - Server codeReports and QueriesAndroidiPhone/iPadJavaUser code (UMC)Ajax

Modified element

When modifying an element containing an invisible value (specified by gStoredValue), gStoredValue must be re-used. Otherwise, this invisible value will be lost during the modification.
For example:
  • adding "MyElement":
    COMBO_MyCombo.Add("MyElement" + gStoredValue("1"))
  • modifying "MyElement":
    COMBO_MyCombo.Modify("MyNewElement" + gStoredValue("1"))
WEBDEV - Browser code

Modifying an element in the browser

When modifying an element in browser code, this element is modified only for the page displayed in the browser. To make changes to this element on the server as well, <List Box>.Modify must be executed on the server.
Calling <List Box>.Modify in browser code is useful when using AJAX technology, in "Programmed AJAX" mode (via AJAXExecute or AJAXExecuteAsynchronous).
Reminder: In "Automatic and immediate AJAX" mode, all you have to do is switch the server process containing <List Box>.Modify to automatic AJAX mode. That's it! No additional programming is required. For more details, see AJAX.


  • To modify an element in a Table control, use <Table>.Modify.
  • <List Box>.Modify can be used on a "Combo Box" table column.
Component: wd290obj.dll
Minimum version required
  • Version 23
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Last update: 06/19/2023

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