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.
[INSERT normal examples of an entry box here - with explanation on the various entry subcommands.]
Hopefully, people will add new pages demonstrating various techniques for doing entry box validation of some common formats, like phone numbers, etc.
See also:
Programmable scientific calculator in two lines: (why, it can do asin and log ;-)
pack [entry .e -textvar e -width 50] bind .e <Return> {catch {expr [string map {/ *1.0/} $e]} res; append e " = $res"} ;# RS
The string map forces floating-point calculation, so people won't be disappointed that 1/2 returns 0 ... See A little calculator for discussion. And, as CL noted, this thingy is programmable: enter for example
[proc fac x {expr {$x<2? 1: $x*[fac [incr x -1]]}}]
into the entry, disregard warnings; now you can do
[fac 10]
and receive [fac 10] = 3628800.0 as result...
One common question is about "Echo-free password entry". Entry has an easy answer: its -show option is useful in precisely this situation.
MG - A useful thing with entry widgets for working with files is to use the -validatecommand option to show if the file exists. For example..
entry .e -textvariable file -width 50 -validate all -validatecommand {isFile %P .e} button .b -text "Browse..." -command {set file [tk_getOpenFile]} proc isFile {f w} { if { [file exists $f] && [file isfile $f] } { $w configure -fg black } else { $w configure -fg red } return 1; };# Mike Griffiths
Peter Newman17 March 2005: Multi-line entry widgets are easily created with the Tk text widget. See:-
Category Widget - Category Command - Tk syntax help - Arts and Crafts of Tcl-Tk Programming