WebCommon.incomingExists(3kaya)

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 March 2010 WebCommon.incomingExists(3kaya)