The Combo Box control

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Help / Developing an application or website / Controls, windows and pages / Controls: Available types / Combo Box control

Overview of the Combo Box control
Control in a window, control in a dynamic or static page
Creating a Combo Box control
To create a Combo Box control:
Type of the Combo Box control expanded area
Characteristics of Combo Box controls
Vocabulary
Swapping

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The Combo Box control

Overview of the Combo Box control

Control in a window, control in a dynamic or static page

The Combo Box control displays a list of elements and allows users to select an element from the list.

Unlike a List Box control, a Combo Box control is not scrolled: the control scrolls the list on demand or when the cursor is positioned over the list.

The elements displayed in a Combo Box control can be defined when creating the control in the editor. These elements:

are defined programmatically.
come from a data file or query.

Creating a Combo Box control

To create a Combo Box control:

On the "Creation" tab, in the "Usual controls" group, click "Combo Box".
Click at the desired location to create the control in the page or window. The Combo Box control creation wizard starts automatically.

Tip: Examples of directly usable Combo Box controls (with associated data and code, if required) can be integrated into your applications by selecting the "Combo" option.. A list shows a preview of the available controls with the project skin template and a "Go" icon that allows you to directly test the desired control. Simply click the control you want to create in the editor.

To view the characteristics of the control, select "Description" in the context menu.

Type of the Combo Box control expanded area

The type of Combo Box control expanded area depends on the elements displayed by the Combo Box control .

To change the type of the Combo Box control expanded area, select "Expanded type" in the "Content" tab of the Combo Box description window ("Description" in the context menu).

The available types are as follows:

List: displays items in list form.
For Combo Box controls based on a data file, the item displayed is defined in the "Content" tab of the control description window ("Description" in the context menu).
Table: displays items in table format. A "Combo Box with table" is automatically created if the Combo Box control must display more than one element.
To view the characteristics of the list columns, select "Column description" in the control context menu (or click "Edit columns" in the "Content" tab of the Combo Box description window).
For a Combo Box control, the displayed items are defined in the characteristics of the list columns ("Column description" in the context menu or "Edit columns" in the "Content" tab of the control based on a data file description window).
This type of expanded area is not available.
Image list: displays items as an image list.
To view the characteristics of the ListView, click "Edit ListView..." in the "Content" tab of the Combo Box description window.
For a Combo Box control based on a data file, the item associated with the image caption and the one associated with the image are defined via the options "Displayed item" and "Image item" in the "Content" tab of the Combo Box description ("Description" in the context menu).
This type of expanded area is not available.
Popup window: opens a popup window.
The popup window can be selected in the "Content" tab of the control description window ("Description" in the context menu).
This type of expanded area is not available.

Characteristics of Combo Box controls

Vocabulary

To easily handle a Combo Box control, you must be familiar with the following vocabulary:

Name	Definition

Selection bar	Allows you to view the selected element in the expanded area. A specific color is used in most cases.
File Combo	The Combo box control is based on a data file or query. The control elements correspond to the file records. There are two types of Combo Box controls based on a data file: *Combo Box control file "Loaded into memory ": The content of the field is loaded into memory and then displayed in the. Access to the elements of the Combo Box control is faster. This mode is reserved for data files with less than 100,000 records. Combo Box control "Direct access (unlimited) "*: The field directly displays the contents of the data file or query.. The current record corresponds to the selected element. Selecting an element in the control triggers an access to the linked data file. This type of control is reserved for data files with more than 100,000 records.
Combo Box populated programmatically	The Combo Box control is not based on a data file or query. The elements displayed in the Combo Box control are defined by the developer (in the description window or through programming).
Editable Combo Box	The user can enter text in the edit control associated with the Combo Box. If the "Assisted input" option is selected, the user can quickly select the element by entering the first few letters: the letters entered are automatically completed with the corresponding element.
Non-editable Combo Box	The user selects an element in the expanded area via the selection bar.

Swapping

Related Examples:

Unit examples (WINDEV): The Combo Box control

[ + ] Using a Combo Box control

Complete examples (WINDEV): WD Managing a computer fleet

[ + ] This example presents the management of a computer fleet with WINDEV.
The following topics are presented in this example:
1/ the printed reports,
2/ the graphic representation of the location of the computer,
3/ the automatically filled combo boxes.
Summary of the example supplied with WINDEV:
This example is used to manage a computer fleet.
For each computer, you will be able to define its characteristics, its components, the person who is using it as well as its location in the offices.

Unit examples (WINDEV): The EyeMagnet

[ + ] Using the "eYe magnet" mechanism (also called conditional formatting)
The "eYe magnet" consists in modifying the visual aspect of a control in order to attract the user's attention to this control. WINDEV allows you to automatically modify this visual aspect according to a set of conditions.