Manipulating Button controls programmatically

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

Overview
Retrieving and modifying the caption of the Button control
Retrieving the caption
Changing the caption
Finding out and modifying the state of an On/Off button
Changing the target of a Button control
To use a simple target (frame of the frameset for example) in most cases and a new browser in some cases:
To open a browser in most cases and to use a specific destination in some cases:
Modifying the image displayed in the Button control
To change the image of a Button control in browser code
Properties specific to the management of images in a Button control

WINDEV

WEBDEV

WINDEV Mobile

Others

See also

The Button control

Manipulating Button controls programmatically

Overview

WINDEV, WINDEV Mobile and WEBDEV allow you to programmatically manipulate Button controls. To do so, use the variable of the Button control in the code.

The variable of the Button control:

corresponds to the name of the Button control.
is initialized with the caption of the Button control.

Retrieving and modifying the caption of the Button control

Retrieving the caption

To retrieve the caption of the Button control, use the following syntax:

direct syntax:
<Caption> = <Button control>

using the Caption property:
<Caption> = <Button control>.Caption

<Caption> is Character String variable.

Remark: If the caption is in RTF ("RTF" checked in the "General" tab of the control description), the retrieved caption will contain the RTF tags. To get the caption without the RTF tags, use RTFToText.
For example:

MyCaption is string
MyCaption = RTFToText(BTN_Button.Caption)

Changing the caption

To modify the caption of the Button control, use the following syntax:

<Caption> is Character String variable.

Remark: If the caption is in RTF ("RTF" checked in the "General" tab of the control description), the new caption may (or may not) contain RTF text.

Finding out and modifying the state of an On/Off button

The Pushed property is used to get the state of the Button control:

<State> = <Button control>.Pushed

<State> is a Boolean variable:

True if the button is pressed,
False if the button is released.

Changing the target of a Button control

The target of a Button control is defined in the page editor at the same time as the action to perform (in the description window of the Button control). For more details, see Action associated with the Button control.

WEBDEV allows you to change this target programmatically. Indeed, in some sites, the target of a Button control can be modified according to the action performed by the Web user.

Example: if the Web user types his name and password:

if the password is correct, the application continues in the current page
if the password is incorrect, a new browser is opened to ask for the name and password again.

In this example, in most cases, the Web user will enter a correct password. The error is an exception.

To use a simple target (frame of the frameset for example) in most cases and a new browser in some cases:

In the Button control description, define the "simple" target (frame of the frameset, current browser, etc.).
In the browser code of the Button control, use ChangeTarget:
IF <Condition> THEN
// Change the target
// Display in a new browser
ChangeTarget(NewBrowser, "New")
END

To open a browser in most cases and to use a specific destination in some cases:

In the Button control description, define the "New browser" target by defining the parameters of the new browser.
In the browser code of the Button control, use ChangeTarget:
IF <Condition> THEN
// Change the target
// Display in the "FRM_Target" frame
ChangeTarget(FRM_Target)
END

Modifying the image displayed in the Button control

To change the image displayed in the Button control, use the Image property:

<Button control>.Image = <Image path>

<Image path> is a Character String variable

The following image formats are supported in Windows:

Bitmap (*.BMP)
Graphics Interchange Format (*.gif)
Joint Picture Experts Group (*.jpg ; *.jpeg)
Kodak Photo CD (*.pcd)
PaintBrush (*.pcx)
Adobe Photoshop Format (*.psd)
TrueVision TARGA (*.tga)
Tagged Image File Format (*.tif ; *.tiff)
Remark: the "tiled tiff" option of tiff 6.0 standard is not supported. In this case, we advise you to save the image in tiff 5.0 standard.
Portable Network Graphics (*.png)
Windows MetaFiles (*.emf ; *.wmf)
Icons (*.ico ; *.icw)
Remarks:
- HQ display (High Quality) available.
- Management of sheets in transparent BMP format (32 bits).
Cursors (*.cur)
Portable Document Format (*.pdf)
Scalable Vector Graphics (*.svg)
WINDEV images (generated by the image editor, *.WDPIC).

Remark: To manage the images in TIFF, GIF and JPEG format, Wxxximg.dll must be installed with the other DLLs of WINDEV.

To change the image of a Button control in browser code

Save the new image in the "<ProjectName>_WEB" directory.
Use the FolderWeb function. For example:
BTN_IMAGE = FolderWeb() + "/VSXP15022_MODIF.gif"

Properties specific to the management of images in a Button control

The following properties are used to programmatically handle the images used in a Button control.


BackgroundImage	Allows you to find out and modify the image associated with the border of a Button control.
BackgroundImageState	Allows you to find out and modify the number of drawings found in the image associated with the border of a Button control.
Image	Allows you to find out and modify the image of a Button control.
ImageState	Allows you to find out and modify the number of drawings found in the image associated with a Button control.
Pushed	Allows you to find out and modify the state of an on/off Button control (pressed or not).
Value	Allows you to find out and modify the caption of a Button control.

For a complete list of WLanguage properties that can be used with Button controls, see Button control properties.