Handling a Radio Button control through programming (prefix syntax)

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Overview
Initializing the choice of a Radio Button control
Displaying a Radio Button control with no default option
Retrieving the option selected in a Radio Button control
Case of a Radio Button control that returns an integer
For a Radio Button control that returns a value
Pre-filled SWITCH on the Radio Button controls
Modifying the caption of a Radio Button control
Case of Radio Button controls with sub-captions
Changing the colors of captions for the options in a Radio Button control
Properties specific to Radio Button controls

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WINDEV Mobile

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Handling a Radio Button control through programming (prefix syntax)

Overview

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

Regardless of the type of picker, each option can be associated with:

an integer. This integer can take a value from 1 to N, N being the total number of options found in the radio button. The first option is the option #1, the second option is the option #2, ... The options are numbered from top to bottom and left to right.
a specific returned value . This returned value is specified in the "Content" tab of the control description window.

Using the numbering or the returned values?
The method for programming the radio buttons that return an integer differs from the method for programming the radio buttons that return a value. The benefit of using returned values is visible when inserting or moving an option in the radio button:

If the radio button returns an integer, inserting or moving an option in the radio button forces you to revise the entire code for managing the value of the radio button (to manage the change in the numbers).
If the radio button returns a specific value, inserting an option into the radio button only requires to take the new option into account. Moving an option requires no modification.

Remark: Several WLanguage functions can be used to add, insert or delete options in a Radio Button control.. For more details, see Radio Button control functions.

Initializing the choice of a Radio Button control

By default, the first option is selected when a Radio Button control is displayed.

To check an option of a Radio Button control:

if the Radio Button control returns an integer, use the following syntax:
<Radio Button control> = <Option index>
if the Radio Button control returns a specific value (in WINDEV or WINDEV Mobile only), use the following syntax:
<Radio Button control> = <Option value>

The selection of an option unchecks the option that is currently selected.

Remark: If the field is associated with an item in a data file, assignment is automatically performed using:

the <Window>.FromFile function.
the <Page>.FromFile function.

For more details, see Binding a Radio Button control to an item.

Displaying a Radio Button control with no default option

A Radio Button control is always positioned on a position (1 by default).

To display a Radio Button control with no default option, all you have to do is assign the initial control value to:

-1 for a Radio Button control that returns an integer,
"" (empty string) for a Radio Button control that returns a value.

Remark: By default, a Radio Button control with no default value is inaccessible via TAB.

Example:

// Display the Radio Button control without initial value
RADIO_MyRadioButton = -1
// or RADIO_MyRadioButton = ""

Retrieving the option selected in a Radio Button control

Case of a Radio Button control that returns an integer

To get the index of the selected option in the Radio Button control, use the following syntax:

In this case, <Option index> is an integer that corresponds to the number of the selected option.

To find out the caption of the option selected in the Radio Button control, use the following syntax:

<Option caption> = <Radio Button control>[Radio Button control].Caption

Note: If the field is associated with an item in a data file, the value entered is automatically retrieved using:

the <Window>.ToFile function.
the <Page>.ToFile function.

For more details, see Linking a Radio Button control to an item.

For a Radio Button control that returns a value

To retrieve the value of the option selected in the Radio Button control, use the following syntax:

In this case, the <Option value> parameter is a character string corresponding to the returned value of the selected option.

Remark: The ReturnedValue property can also be used to find out and modify the value returned by each Radio Button control option.

To get the index of the selected option, a specific process must be performed. Example:

// Value returned by the selected option
Result1 = RADIO_TodaysDish
// Find the index of selected option
Index is int
I is int
FOR I = 1 _TO_ RADIO_TodaysDish.Count
IF RADIO_TodaysDish[I].ReturnedValue = Result1 THEN Index = I
END

To find out the caption of the option selected in the Radio Button control, use the following syntax:

<Option caption> = <Radio Button control>[Option index].Caption

Note: If the field is associated with an item in a data file, the value entered is automatically retrieved using:

the <Window>.ToFile function.
the <Page>.ToFile function.

For more details, see Linking a Radio Button control to an item.

Pre-filled SWITCH on the Radio Button controls

When typing the SWITCH statement relative to a Radio Button control, the code editor automatically adds the CASE corresponding to the different options of the Radio Button control. The caption of each option is automatically added in line comment.

For example:

Code for a picker field returning an integer: entering "SELON SEL_Civilité" in the code editor displays:
Code for a picker field returning a value: entering "SELON SEL_PlatDuJour" in the code editor displays:

Modifying the caption of a Radio Button control

The Caption property allows you to:

change the caption of the Radio Button control:
<Name of Radio Button control>.Caption = <Caption>
change the caption of all options found in the Radio Button control:
The options must be separated by the TAB character.
You can specify the first options only.
<Radio Button control>.Caption = <Option 1>+TAB+<Option 2>+TAB+<Option 3> ...
retrieve and modify the caption of an option:
// Get the sub-caption
<Sub-caption> = <Radio Button control>[<Option index>].SubCaption

// Modify the sub-caption
<Radio Button control>[<Option index>].SubCaption = <New sub-caption>

Case of Radio Button controls with sub-captions

The SubCaption property gets and sets the sub-captions of options in a Radio Button control.

// Get the sub-caption
<Sub-caption> = <Radio Button control>[<Option index>].SubCaption

// Modify the sub-caption
<Radio Button control>[<Option index>].SubCaption = <New sub-caption>

Changing the colors of captions for the options in a Radio Button control

To modify the colors of captions for the options found in a Radio Button control, you have the ability to use the following syntax:

<Radio Button control>.Caption = gPen(<Color of option 1>) + ...
<Caption of option 1> + TAB + ...
gPen(<Color of option N>) + <Caption of option N>

<Color of option> corresponds to:

an RGB color (returned by RGB),
an HSL color (returned by HSL),
a WLanguage preset color.

Properties specific to Radio Button controls

The following properties are used to programmatically manage the characteristics of a Radio Button control.


BackgroundColor	Used to find out and modify the background color of the Radio Button control.
Color	Used to find out and modify the color of the text for the options found in the Radio Button control.
Count	Used to find out the number of options in a Radio Button control.
HorizontalAlignment	Used to find out and modify the horizontal alignment of a control.
InitialValue	Used to find out the initial value of a Radio Button control.
NumberColumn	Used to find out the number of columns in a Radio Button control.
ReturnedValue	Enables you to find out and modify the value returned by an option in a Radio Button control.
SubCaption	Used to find out and modify the sub-caption of an option found in a Radio Button control.
VerticalAlignment	Used to find out and modify the vertical alignment of a control.

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