103 lines
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HTML
103 lines
6.0 KiB
HTML
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<title>CHANGE (Change) keyword for display files</title>
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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">CHANGE (Change) keyword for display files</h1>
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<div><p>Use this record- or field-level keyword to set on the specified
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response indicator for an input operation.</p>
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<div class="section"><p>This is done under the following conditions:</p>
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<ul><li>The keyword is specified at the record level, and any input-capable field
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in the record format has its changed data tag (MDT) set on.</li>
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<li>The keyword is specified for an input-capable field, and that field has
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its changed data tag (MDT) set on.</li>
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</ul>
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<p>See the <a href="s36env.htm">System/36 environment considerations for display files</a> topic for information about
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how to specify the CHANGE keyword in files that are used in the System/36™ environment.</p>
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<div class="p">The
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format of the keyword is: <pre>CHANGE(response-indicator ['text'])</pre>
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</div>
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<p>The
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MDT of an input-capable field is set on when the display station user keys
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into the field, or when your program selects the display attribute (DSPATR(MDT))
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keyword for the output operation that displays the field. If the MDT is set
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on using the DSPATR(MDT) keyword, the data in the field might not have changed
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even though the MDT (and hence the response indicator specified for CHANGE)
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is set on. Also, note that the MDT is set on even if the workstation user
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keys the same data in the field as was initially displayed (such as typing
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into a blank field and then blanking the field).</p>
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<div class="note"><span class="notetitle">Note:</span> The CHANGE response
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indicator is not set on when a command attention key (CAnn, Help, Print, Home,
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or Clear) is pressed.</div>
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<p>When the <span class="keyword">i5/OS™</span> operating
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system detects validity checking errors and displays the record again with
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an error message, any CHANGE keyword response indicators that have been set
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on by typing into fields remain on until all validity checks succeed and the
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record is passed to your program.</p>
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<p>The optional text is included on the
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list created at program compilation time to explain the intended use of the
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indicator. This text has no function in the file or the program other than
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as a comment. The single quotation marks are required. If you specify more
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than 50 characters between the single quotation marks, the text is truncated
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to 50 characters on the program computer printout.</p>
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<p>Option indicators
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are not valid for this keyword.</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Example 1</h4><p>The following example shows how to specify
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the CHANGE keyword at the field level.</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A FLDX 5 B 8 2CHANGE(67 'FLDX was changed')
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A
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00020A FLDY 3 I 8 30CHANGE(68 'FLDY was entered')
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A</pre>
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</div>
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<div class="example"><h4 class="sectiontitle">Example 2</h4><p>The following example shows how to specify
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the CHANGE keyword at the record level.</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A R REC1
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00020A CHANGE(88 'A field was changed')
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00030A*
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00040A FIELD1 10 B 3 2
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00050A FIELD2 5 B 5 2
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00060A FIELD3 6 B 7 2
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00070A FIELD4 3 I 9 2DFT('ABC')
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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="rzakcmstkeyent.htm" title="You type the keyword entries that define display files in positions 45 through 80 (functions).">DDS keyword entries for display files (positions 45 through 80)</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="s36change.htm" title="Use this record-level keyword to indicate that, on an input operation, the record is to be returned to the application program only if the user has changed it.">CHANGE record-level keyword</a></div>
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