Grid is one of several [Geometry Managers]. Some others are [pack] and [place].
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http://www.tcl.tk/man/tcl8.5/TkCmd/grid.htm

    :   '''grid''' ''slave ?slave ...? ?options?''

    :   '''[grid bbox]''' ''master ?column row? ?column2 row2?''

    :   '''[grid columnconfigure]''' ''master index ?-option value...?''

    :   '''[grid configure]''' ''slave ?slave ...? ?options?''

    :   '''[grid forget]''' ''slave ?slave ...?''

    :   '''[grid info]''' ''slave''

    :   '''[grid location]''' ''master x y''

    :   '''[grid propagate]''' ''master ?boolean?''

    :   '''[grid remove]''' ''slave ?slave ...?''

    :   '''[grid rowconfigure]''' ''master index ?-option value...?''

    :   '''[grid size]''' ''master''

    :   '''[grid slaves]''' ''master ?-option value?''

If the first argument to '''grid''' is suitable as the first slave argument to '''[grid configure]'', either a window name (i.e., a value starting with “`.`”) or one of the characters “`x`” or “`^`”  (see the "[http://www.tcl.tk/man/tcl8.6/TkCmd/grid.htm#M28%|%RELATIVE PLACEMENT]" section in the manual page), then the command is processed in the same way as '''[grid configure]'''.

<<discussion>>

The [Book Practical Programming in Tcl and Tk, Fourth Edition] contains an excellent introduction to the grid command, which is available online at [http://www.beedub.com/book/].

Grid is excellent for many kinds of common GUI forms because it arranges widgets in nice rows and columns, and handles resizing quite nicely. 

----
A simple example is a panel with just a few labels and entries.

======
    package require Tk

    foreach field {Name Address City State Phone} {
        #  Create a couple of widgets
        set l [label .lab$field -text $field]
        set e [entry .ent$field -justify right ]
        #  Assign both to a row in the grid
        grid $l $e -padx 4 -pady 4
        #  Then adjust how they appear
        grid $l -sticky e
        grid $e -sticky ew
    }

    # X-resize is done by the entry column
    grid columnconfigure . 1 -weight 1

    #  Y-resize should be at the bottom...
    set lastrow [lindex [grid size .] 1]
    grid rowconfigure . [expr $lastrow - 1] -weight 1
======

For a little more complex example, see [A little spreadsheet].
----

On comp.lang.tcl, [http://groups.google.com/group/comp.lang.tcl/browse_thread/thread/86590035a1030c71#] describes how a change between Tk 8.4 and 8.5 causes code which depends on the grid default behavior may need to be modified. The specific example is the [iwidgets] disjointlistbox, but other code may find the same issue.
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[DKF] - The term ''Grid'' also refers to the very high end of resource sharing systems over the internet which it is likely that people will be hearing a lot more about in the future, especially in phrases like [Grid Service]s...


TclGlobus is a project to allow Grid interfaces in Tcl: http://tclglobus.ligo.caltech.edu/

<<discussion>>
----
**See also**
   * [simplified grid]
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%| [Category Command] | [Category GUI] |%
[Arts and Crafts of Tcl-Tk Programming] - [Tk syntax help]
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