Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!cs.utexas.edu!sun-barr!ccut!wnoc-tyo-news!sranha!sran123!sran251!sran192!sahara
From: sahara@sran192.sra.co.jp (Shin Sahara)
Newsgroups: comp.sys.mac.hypercard
Subject: Re: checking for field existence?
Message-ID: <1173@sran251.sra.co.JP>
Date: 7 Apr 91 13:13:03 GMT
References: <1991Apr3.192733.28490@hubcap.clemson.edu>
Sender: news@sran251.sra.co.JP
Organization: Software Research Associates, Inc., Japan
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In article <1991Apr3.192733.28490@hubcap.clemson.edu> jcocon@hubcap.clemson.edu (james c oconnor) writes:
>I would like to be able to check to see if a field by a particular
>name exists.  Is this possible, or should I write an xcmd?
 You can test for the existence of something by "there is" operators.
The forms are:

there is a{n} <thing>
there is not a{n} <thing>
there is no <thing>
<thing> := <window> | <menu> | <menuItem> | <file> | <button> | <field> |
<card> | <background> | <stack>

So you can say:
 if there is not a field "money" then makeMoney

	103kg