How to get value from multiple Checkbutton Tkinter

Question

How can I retrieve the value from multiple Checkbuttons when Checkbutton are generated in a method?

The method button which have to retrieve value checked

    def __download(self, url: Entry, button: Button):
        """
        download video infos video and display checkbox
        :return:
        """
        try:
            url = url.get()
            video: Video = Video()

            if button['text'] != 'Download':
                video.url = url
                video.video = YouTube(url)
                self.__display_video_title(video)
                self.__display_video_thumbnail(video)

                resolution = video._get_video_resolution()
                # checkbox are created here
                self.__display_checkbox(resolution, video)
                button['text'] = 'Download'
            else:
                # need to get the value here
                pass
        except exceptions.RegexMatchError:
            print('the url is not correct')
        except exceptions.VideoPrivate:
            print('Can\'t reach the video')
        except exceptions.VideoUnavailable:
            print('this video is unavailable')

the method which creates the Checkbuttons

    def __display_checkbox(self, resolution: list, video: Video):
        x_checkbox = 25
        var = StringVar()

        checkbox_title = Label(self.app, border=None, font='Terminal 15 bold', bg='#f1faee', fg='#457b9d',
                               text='Choose your resolution')
        checkbox_title.place(x=280, y=85)

        for res in resolution:
            Checkbutton(self.app, text=res, bg='#f1faee', variable=var, onvalue=res, offvalue='off').place(x=x_checkbox, y=120)
            x_checkbox += 100

Martin Wettstein · Accepted Answer · 2021-03-16 17:42:36Z

3

If you create several checkboxes, you should not use the same variable for each of them. Otherwise, you will select (or in your case deselect) all of them once you click one.

You can store multiple variables in a list to access the state of each variable from other methods:

        self.states = []
        for res in resolution:
            cvar = StringVar()
            cvar.set("off")
            Checkbutton(self.app, text=res, bg='#f1faee', variable=cvar, onvalue=res, offvalue='off').place(x=x_checkbox, y=120)
            self.states.append(cvar)
            x_checkbox += 100

You now have a list that is an attribute of your widget: It holds all the values for checkboxes. So, you can get the values simply by:

for v in self.states:
    if not v.get()=="off":
        print("Resolution selected: "+v.get())

You could also have two lists, one containing all the resolutions, the other containing an integer (1=checked, 0=unchecked), so you can see for all resolutions whether it was checked or not. In your program, you only see the checked ones. The others hold an uninformative 'off'

edited Mar 16, 2021 at 17:42

answered Mar 15, 2021 at 7:57

Martin Wettstein

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2 Comments

Jagadeeshkumar Viswanathan Over a year ago

I'm unable to get the values selected using this method @MartinWettstein

Martin Wettstein Over a year ago

What exactly is the problem? What's the error message?

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