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Practical Programming in Tcl & Tk, Third Edition by Brent B. Welch

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Using Entry Widgets

The entry widget supports editing, scrolling, and selections, which make it more complex than label or message widgets. Fortunately, the default settings for an entry widget make it usable right away. You click with the left button to set the insert point and then type in text. Text is selected by dragging out a selection with the left button. The entry can be scrolled horizontally by dragging with the middle mouse button.

One common use of an entry widget is to associate a label with it, and a command to execute when <Return> is pressed in the entry. The grid geometry manager is ideal for lining up several entries and their labels. This is implemented in the following example:

Example 31-1 A command entry.
 foreach field ...

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