<List Box>.Insert (Function)

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List control with more than 10,000 elements
Visibility/Invisibility of elements in a List Box or Combo Box control
Sorted/Unsorted List Box control
Adding an element to the browser
Miscellaneous

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<List Box>.Insert (Function)

In french: <Liste>.Insère

Inserts an element into a List Box, ListView or Combo Box control populated programmatically.

Remarks:

To add an element at the end of List Box (or Combo Box) control, use <List Box>.Add.
<List Box>.Insert can be used on single-selection and multi-selection List Box controls
To manage the contents of a Combo Box control in a container column of a Table control, use the Content property.

Attention: The element will only be added to the page displayed in the browser.. For more details, see Remarks.

Example

// Ajoute le nom "Dubois" à l'indice 4 dans le champ Liste "LISTE_ListeClient"
LISTE_ListeClient.Insère("Dubois", 4)

Syntax

<List Box control>.Insert(<Element> [, <Element index>])

<List Box control>: Control name

Name of List Box or Combo Box control populated programmatically.

<Element>: Character string

Element that must be inserted into the specified List Box (or Combo Box) control populated programmatically.
This parameter can contain:
Carriage Return characters (CR) to add several rows. In this case:
if <Element index> is not specified, the elements are added.
If <Element index> is specified, only the first element will be added.
tabs (TAB) to obtain a multi-element List Box control (see Notes).
The Carriage Return characters (CR) and the tabulations (TAB) are not supported.
To add several consecutive spaces, use non-breaking spaces: Caract(160).

<Element index>: Optional integer

Index of the element to be inserted.
If this parameter:
is not specified, the element is inserted:
before the current element in a single-selection List Box control. If there is no current element, the element is inserted at the last position in the List Box (or Combo Box) control populated programmatically.
at the last position in the List Box (or Combo Box) control populated programmatically, in a multi-selection List Box control.
is greater than the number of elements in the List Box (or Combo Box) control, the element is inserted at the last position in the List Box (or Combo Box) control populated programmatically. The number of elements in a List Box (or Combo Box) control is returned by <List Box>.Count.
is equal to 0, the element is added at the first position in the List Box (or Combo Box) control populated programmatically.

Remarks

List control with more than 10,000 elements

The maximum number of elements that can be contained in a List Box control is limited only by available RAM (theoretical maximum: 2 billion lines). Nevertheless, populating a List Box control with a large number of elements (more than 10,000) affects performance.
To add a large number of elements, it is recommended to use a List Box control based on an HFSQL data file.

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.

Sorted/Unsorted List Box control

If the List Box control is sorted, the new element is inserted at the current position without sorting the list box.
If the List Box control is not sorted, the new element is added:
- at <Element index> if <Element index> is specified.
- before the current element in a single-selection List Box control if the <Element index> parameter is not specified. If there is no current element, the element is inserted at the last position in the List Box (or Combo Box) control populated programmatically.
- at the last position of the List Box (or Combo Box) control populated programmatically in a multi-selection List Box control, if the <Element index> is not specified.

The type of the List Box control (sorted or not) is selected 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.

The element is added at the end of control, no matter whether the List Box control is sorted or not.

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>.Insert must be run on the server.

Calling <List Box>.Insert 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>.Insert FUNCTION in automatic AJAX mode. That's it! No additional programming is required. For more details, see AJAX.

Miscellaneous

To insert an element into a Table control, use <Table>.Insert.
<List Box>.Insert can be used on a "Combo Box" column in a Table control .

Component: wd300obj.dll