ListInsert (Function)

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List Box controls containing more than 10 000 elements
Visibility/Invisibility of elements in a List Box or Combo Box control
Customizing the elements found in a List Box or Combo Box control
Sorted/Unsorted List Box control
Tabulations: Multiselection List Box control
Adding an element onto the browser
Various

WINDEV

WEBDEV

WINDEV Mobile

Others

See also

ListInsert (Function)

In french: ListeInsère

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

Remarks:

To add an element at the end of List Box (or Combo Box) control, use ListAdd.
ListInsert can be used on single-selection and multiselection List Box controls
To manage the content of a Combo Box control found in a container table column, use Content.

Caution: The element will only be added to the page displayed in the browser. See Remarks for more details.

Versions 15 and later

This function is now available for Android applications.

New in version 15

This function is now available for Android applications.

Versions 16 and later

This function is now available for WINDEV applications in Linux.

New in version 16

This function is now available for WINDEV applications in Linux.

Versions 17 and later

This function is now available for iPhone/iPad applications.

New in version 17

This function is now available for iPhone/iPad applications.

Versions 21 and later

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Universal Windows 10 App mode.

Example

// Add "Clark" in 4th position to "LIST_CustomerList"
ListInsert(LIST_CustomerList, "Clark", 4)

// Add the "C:\MyImages\CoralReef.JPG" image in 5th position to "LSV_Diving"
// The caption of this image will be "Nice coral"
ListInsert(LSV_Diving, "Nice coral", "C:\MyImages\CoralReef.JPG", 4)

Syntax

<Result> = ListInsert(<List Box control> , <Element> [, <Image> [, <Element subscript>]])

<Result>: Boolean

True if the element was inserted,
False otherwise.
ListInsert returns no result.

<List Box control>: Control name

Name of memory List Box or memory Combo Box control to use.
If this parameter corresponds to an empty string (""), the element is inserted in the List Box or Combo Box control to which the current process belongs.
The name of List Box or Combo Box control to use must necessarily be specified.

<Element>: Character string (with quotes)

Element that must be inserted into the specified memory List Box (or Combo Box) control.
This parameter can contain:
Carriage Return characters (CR) to add several rows. In this case:
if <Element subscript> is not specified, the elements are actually added.
If <Element subscript> is specified, only the first element will be added.
tabs (TAB) to obtain a multi-element List Box control (see Notes).
For a ListView control, this parameter corresponds to the image caption. This parameter can contain Carriage Return characters (CR) to add several elements. In this case:
if <Image> and <Element subscript> are not specified, the added elements will be associated with the default image (defined in the "Details" tab of the description window of control).
if <Image> and <Element subscript> are specified, only the first element will be added. This element will be associated with the default image (defined in the "Details" tab of the description window of control).
if <Image> is specified and if <Element subscript> is not specified, only the first element will be added. This element will be associated with the specified image.
The Carriage Return characters (CR) and the tabulations (TAB) are not supported.
To add several consecutive spaces, non-breakable space characters must be used: Charact(160).

<Image>: Optional character string (with quotes)

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.
This parameter is not available.

<Element subscript>: Optional integer

Subscript of element to insert.
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 end of the memory List Box (or Combo Box) control.
at the end of the List Box (or Combo Box) control in a multiselection List Box control.
is greater than the number of elements found in the List Box (or Combo Box) control, the element is inserted at the end of the memory List Box (or Combo Box) control. The number of elements found in a List Box (or Combo Box) control is returned by ListCount.
is equal to 0, the element is added at the beginning of memory List Box (or Combo Box) control.

Remarks

List Box controls containing more than 10 000 elements

The maximum number of elements found in a List Box control is limited by the available memory (theoretical maximum: 2 billion rows). Nevertheless, filling a List Box control with an important number of elements (more than 10 000) affects the performances.
To add a large number of elements to a List Box control, we recommend you use a browsing List Box control (that is a List Box control directly linked to a 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 gLink.

Customizing the elements found in a List Box or Combo Box control

To customize the elements found in a List Box or Combo Box control (background color, image, drawing, ...), use the Graphic strings management functions.

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 subscript> if <Element subscript> is specified.
- before the current element in a single-selection List Box control if the <Element subscript> parameter is not specified. If there is no current element, the element is inserted at the end of the memory List Box (or Combo Box) control.
- at the end of the List Box (or Combo Box) control in a multiselection List Box control if the <Element subscript> parameter is not specified.

The type of the List Box control (sorted or not) is selected during the control description ("Details" tab).

The ListAdd function should be preferred to the ListInsert function to add an item 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.

Tabulations: Multiselection List Box control

To manage the tabulations in a List Box control (alignment of columns), use the TAB constant. For example:

ListInsert(LIST_Customer, LastName + TAB + FirstName)

In this example, all the first names start at the same position and are aligned one under the other.

Remark: The first call to ListInsert defines the position of tabulations. These positions will be taken as reference for all values added thereafter. Similarly, if values have been typed entered in the editor, the positions of these values are taken as reference. During the first call to ListInsert, we advise you to define the width of columns with Complete. For example, to fix the width of columns found in "LIST_Customer" to 10 characters:

ListInsert(LIST_Customer, Complete(LastName, 10) + TAB + Complete(FirstName, 10))

Adding an element onto 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, ListInsert must be run on the server.

Calling ListInsert 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 ListInsert to automatic AJAX mode. That's it! No additional programming is required. For more details, see AJAX.

Various

To insert an element into a Table control, use TableInsert.
ListInsert can be used on a "Combo Box" column found in a Table control .

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