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Practical Programming in Tcl and Tk, Fourth Edition by Brent Welch, Ken Jones

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Chapter 34. The Entry and Spinbox Widgets

The entry widget provides a single line of text for use as a data entry field. The string in the entry can be linked to a Tcl variable. A spinbox is an extended entry that also allows the user to move, or “spin,” through a fixed set of values.

Entry widgets are specialized text widgets that display a single line of editable text. They have a subset of the functionality of the general-purpose text widget described in Chapter 36. The entry is commonly used in dialog boxes when values need to be filled in, or as a simple command entry widget. A very useful feature of the entry is the ability to link it to a Tcl variable. The entry displays that variable's value, and editing the contents of the entry changes ...

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