.\" This man page is automatically generated using
.\" kayadoc2man from the Kaya development tools and the -xmldocs compile 
.\" option. Editing it directly is not encouraged.
.\" It is under the same license as the source .k file that it was
.\" generated from.
.TH "WebCommon.incomingExists" "3kaya" "August 2014" "Kaya" "Kaya module reference"
.SH "NAME"
WebCommon::incomingExists \- Checks a key exists in user-supplied data
.SH "SYNOPSIS"
.B Bool incomingExists(
\fIString key, DataSource ds\fP
.B ")"
.SH "ARGUMENTS"
.PP
.B "key"
The key to check
.PP
.B "ds"
The source for user-supplied data
.SH "DESCRIPTION"
.PP
Returns
\fBtrue \fP
if the key exists in the data source, and
\fBfalse \fP
otherwise.
.IP "" -4
 // 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
.PP
This is useful for avoiding Exceptions when using
.B "WebCommon.incomingData"(3kaya)
or
.B "WebCommon.incomingValue"(3kaya)
, or for checking if a checkbox has been selected.
.SH "AUTHORS"
Kaya standard library by Edwin Brady, Chris Morris and others (kaya@kayalang.org). For further information see http://kayalang.org/
.SH 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.
.SH "RELATED"
.PD 0
.PP
.B "WebCommon.DataSource"(3kaya)
.PP
.B "WebCommon.incomingData"(3kaya)
.PP
.B "WebCommon.incomingKeys"(3kaya)
.PP
.B "WebCommon.incomingValue"(3kaya)
.PD 0.4v