74 lines
4.9 KiB
HTML
74 lines
4.9 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Overlapping fields" />
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<meta name="abstract" content="Within a record format, you can define fields to overlap portions of other fields or their attribute characters; however, only one of those fields is shown on the display at a time." />
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<meta name="description" content="Within a record format, you can define fields to overlap portions of other fields or their attribute characters; however, only one of those fields is shown on the display at a time." />
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<meta name="DC.Relation" scheme="URI" content="pos3944.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2001, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2001, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzakcoverlfield" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Overlapping fields</title>
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</head>
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<body id="rzakcoverlfield"><a name="rzakcoverlfield"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Overlapping fields</h1>
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<div><p>Within a record format, you can define fields to overlap portions
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of other fields or their attribute characters; however, only one of those
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fields is shown on the display at a time.</p>
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<p>At run time, when processing overlapping fields within a record, the <span class="keyword">i5/OS™</span> program looks at the fields
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in line and position sequence. When the <span class="keyword">i5/OS</span> operating
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system finds a field whose conditioning is satisfied or that does not have
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an option indicator specified, it selects that field for display and ignores
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the remaining overlapping fields. The first overlapping field that does not
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have an option indicator specified always stops the search, and any subsequent
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overlapping fields are never displayed. In the following example, if indicator
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01 is set on, FIELD1 is the only field displayed. If indicator 01 is off and
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indicator 02 is on, FIELD2 is the only field displayed. FIELD3 is displayed
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when neither of the others is selected.</p>
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<p><a href="#rzakcoverlfield__overlap">Figure 1</a> shows how to define overlapping
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fields.</p>
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<div class="fignone" id="rzakcoverlfield__overlap"><a name="rzakcoverlfield__overlap"><!-- --></a><span class="figcap">Figure 1. Specify overlapping fields</span><pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A 01 FIELD1 10 1 5TEXT('ONE')
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00020A 02 FIELD2 5 1 5TEXT('TWO')
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00030A FIELD3 2 0 1 5TEXT('THREE')
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A</pre>
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</div>
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<p>If used incorrectly, this capability can result in problems in user and
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program communication. In the following example, only one input field (FIELD4)
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is specified for the record, and according to the field location specification,
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this field overlaps a preceding output field. The workstation user is not
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able to type in any data because FIELD1 is always the field selected for display.
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The other three fields, including FIELD4, are never displayed.</p>
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<p><a href="#rzakcoverlfield__nondisp">Figure 2</a> shows an example of incorrect
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field specification entry.</p>
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<div class="fignone" id="rzakcoverlfield__nondisp"><a name="rzakcoverlfield__nondisp"><!-- --></a><span class="figcap">Figure 2. Incorrect field specification</span><pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A FIELD1 10 1 5TEXT('ONE')
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00020A 21 FIELD2 5 1 5TEXT('TWO')
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00030A 12 FIELD3 2 0 1 5TEXT('THREE')
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00040A FIELD4 5Y 2I 1 5TEXT('FOUR')
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A</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="pos3944.htm" title="Use these positions to specify the exact location on the display where each field begins.">Location for display files (positions 39 through 44)</a></div>
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</div>
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</div>
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</body>
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</html> |