http://purl.org/tcl/home/man/tcl8.4/TkCmd/entry.htm

An entry box is designed to allow the user to enter one line of text
for use by the application.

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Hopefully, people will add new pages demonstrating various techniques for doing entry box validation of some common formats, like phone numbers, etc.

[Entry Field Processing]

[Validating Credit Card Check Digits]

[Entry box validation for IP address]

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'''Scientific calculator in two lines:''' (why, it can do ''asin'' and ''log'' ;-)
 pack [entry .e -textvar e -width 50]
 bind .e <Return> {catch {expr $e} res; append e " = $res"} ;# RS
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One common question is about "[Echo-free password entry]".
Entry has an easy answer:  its -show option is useful in
precisely this situation.






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