Radiobutton and its indicatoron attribute in tkinter

Tkinter : Radiobutton and its attributes

A radio button , sometimes also called as option button, allows the user to select or choose exactly one of the predefined set of options .

a radiobutton is used when the user have to select only one value from a set of values .

Radio buttons are named after the physical buttons used on old radios to select wave bands or preset radio stations. If such a button was pressed, other buttons would pop out, leaving the pressed button the only pushed in button.

Each group of Radio button widgets has to be associated with the same variable. Pushing a button changes the value of this variable to a predefined certain value.

for example : When you fill a form there is place where you select your gender and you can select only one option at that time it can be male or female or others .

 This is actually a radio button looks like ...

Syntax : 

rd = Radiobutton(master,options)

So let's code :

# radio-button : dynamiccoding.tech
from tkinter import *

def func():
	if var.get() == 1:
		print("radiobutton 1 is selected")
	elif var.get() == 2:
		print("radiobutton 2 is selected")
	elif var.get() == 3:
		print("radiobutton 3 is selected")
	else:
		print("please select radiobutton")

root = Tk()
root.title("Dynamiccoding.tech")
root.configure(bg='pink')

var = IntVar()
radio_1 = Radiobutton(root ,text = 'Radio 1',value = 1 , variable = var)
radio_1.pack(pady=10)

radio_2 = Radiobutton(root ,text = 'Radio 2',value = 2 , variable = var)
radio_2.pack(pady=10)

radio_3 = Radiobutton(root ,text = 'Radio 3',value = 3 , variable = var)
radio_3.pack(pady=10)


Button(root,text = "Press me ",command=func).pack(pady=5)

root.mainloop()

Output : 

As you can see in the code each radiobutton have a unique value which helps to find which radio button is selected and instead of creating a button you can also pass the command attribute directly in radiobutton .

if the radio button is selected the its value is stored in a variable " var " which is a IntVar( )  variable , you can also use other fromats like StringVar( ) or BooleanVar() etc .

Now instead of having radiobutton with circular holes containing white space , we can have radiobutton with complete text in a box.

So how can we do it .

for this we can use indicatoron ( stands for " Indicator on ' ) and place this option equal  to 0 .

So let's code :

 

# radio-button : dynamiccoding.tech
from tkinter import *

def func():
	if var.get() == 1:
		print("radiobutton 1 is selected")
	elif var.get() == 2:
		print("radiobutton 2 is selected")
	elif var.get() == 3:
		print("radiobutton 3 is selected")
	else:
		print("please select radiobutton")

root = Tk()
root.title("Dynamiccoding.tech")
root.configure(bg='pink')

var = IntVar()
radio_1 = Radiobutton(root ,text = 'Radio 1',value = 1 , variable = var,indicatoron=0)
radio_1.pack(pady=10)

radio_2 = Radiobutton(root ,text = 'Radio 2',value = 2 , variable = var,indicatoron=0)
radio_2.pack(pady=10)

radio_3 = Radiobutton(root ,text = 'Radio 3',value = 3 , variable = var,indicatoron=0)
radio_3.pack(pady=10)


Button(root,text = "Press me ",command=func).pack(pady=5)

root.mainloop()

Output : 

As you can see the small holes are now wipeout or removed from the radiobutton and now radiobutton will work like a toggle button .

Options / attributes available with Radiobutton:

SN	Option	Description
1	activebackground	The background color of the widget when it has the focus.
2	activeforeground	The font color of the widget text when it has the focus.
3	anchor	It represents the exact position of the text within the widget  if the widget contains more space than the requirement of the text.  The default value is CENTER.
4	bg	The background color of the widget.
5	bitmap	It is used to display the graphics on the widget. It can be set to any graphical or image object.
6	bd	It represents the size of the border.
7	command	This option is set to the procedure which must be called  every-time when the state of the radiobutton is changed.
8	cursor	The mouse pointer is changed to the specified cursor type.  It can be set to the arrow, dot, etc.
9	font	It represents the font type of the widget text.
10	fg	The normal foreground color of the widget text.
11	height	The vertical dimension of the widget. It is specified as the  number of lines (not pixel).
12	highlightcolor	It represents the color of the focus highlight when the widget has the focus.
13	highlightbackground	The color of the focus highlight when the widget is not having the focus.
14	image	It can be set to an image object if we want to display an image on the radiobutton instead the text.
15	justify	It represents the justification of the multi-line text. It can be set to CENTER(default), LEFT, or RIGHT.
16	padx	The horizontal padding of the widget.
17	pady	The vertical padding of the widget.
18	relief	The type of the border. The default value is FLAT.
19	selectcolor	The color of the radio button when it is selected.
20	selectimage	The image to be displayed on the radiobutton when it is selected.
21	state	It represents the state of the radio button. The default state  of the Radiobutton is NORMAL. However, we can set this to  DISABLED to make the radiobutton unresponsive.
22	text	The text to be displayed on the radiobutton.
23	textvariable	It is of String type that represents the text displayed by the  widget.
24	underline	The default value of this option is -1, however, we can set this option to the number of character which is to be  underlined.
25	value	The value of each radiobutton is assigned to the control  variable when it is turned on by the user.
26	variable	It is the control variable which is used to keep track of the user's choices. It is shared among all the radiobuttons.
27	width	The horizontal dimension of the widget. It is represented as the number of characters.
28	wraplength	We can wrap the text to the number of lines by setting this  option to the desired number so that each line contains only  that number of characters.

Methods :

SN	Method	Description
1	deselect()	It is used to turn of the radiobutton.
2	flash()	It is used to flash the radiobutton between its active and normal colors  few times.
3	invoke()	It is used to call any procedure associated when the state of a Radiobutton  is changed.
4	select()	It is used to select the radiobutton.

Other tkinter related posts are :

 

Combo box in tkinter 

Introduction to tkinter

Text widget in tkinter

Binding Mouse and keyboard in tkinter 

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This blog is contributed by Yogesh singh .

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