NAME

       WebCommon::incomingExists - Checks a key exists in user-supplied data

SYNOPSIS

       Bool incomingExists( String key, DataSource ds )

ARGUMENTS

       key The key to check

       ds The source for user-supplied data

DESCRIPTION

       Returns true if the key exists in the data source, and false otherwise.

    // GET /example.cgi?a=1;b=3;b=5;z=;z;z
    val = incomingExists("a",DataGet);
    // val = true
    val = incomingExists("b",DataGet);
    // val = true
    val = incomingExists("c",DataGet);
    // val = false
    val = incomingExists("z",DataGet);
    // val = true

       This    is    useful   for   avoiding   Exceptions   when   using   WebCommon.incomingData   (3kaya)   or
       WebCommon.incomingValue (3kaya) , or for checking if a checkbox has been selected.

AUTHORS

       Kaya standard  library  by  Edwin  Brady,  Chris  Morris  and  others  (kaya@kayalang.org).  For  further
       information see http://kayalang.org/

LICENSE

       The  Kaya  standard library is free software; you can redistribute it and/or modify it under the terms of
       the GNU Lesser General Public License (version 2.1 or  any  later  version)  as  published  by  the  Free
       Software Foundation.

RELATED

       WebCommon.DataSource (3kaya)
       WebCommon.incomingData (3kaya)
       WebCommon.incomingKeys (3kaya)
       WebCommon.incomingValue (3kaya)

Kaya                                                July 2013                    WebCommon.incomingExists(3kaya)