January 1999
Beginner
373 pages
9h 43m
English
Content preview from Learning Perl/Tk
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter 4. Checkbuttons and Radiobuttons
This chapter discusses both checkbutton and radiobutton widgets. Although they are very similar, they are used for different purposes.
Checkbuttons are useful when you want to select as many items as you want, such as a shopping list. Radiobuttons are used in group situations when you must make a choice between items, such as on a multiple-choice exam:
Q1: What year did Columbus discover America? A) 1400 B) 1470 C) 1472 D) 1492 E) none of the above
Because radiobuttons are grouped together, you are forced to select one and only one choice in that group. If the default choice is always A and you click on D, A would be automatically unclicked (or unselected).
The two sections in this chapter cover how to use both widget types and ways to set them up and configure them.
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