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168 lines
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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">PUTOVR (Put with Explicit Override) keyword for display files</h1>
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<div><p>Use this record-level keyword to permit the override of either
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display attributes or data contents (or both) of specific fields within a
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record displayed on a workstation device. By using PUTOVR, you can reduce
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the amount of data sent to the display device.</p>
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<div class="section"><p>This keyword has no parameters.</p>
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<p>If you use the PUTOVR keyword
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and subfiles, certain restrictions apply. See the <a href="../books/sc415715.pdf" target="_blank">Application Display Programming book</a><img src="wbpdf.gif" alt="Link to PDF" /> for more information about these
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restrictions and how to use PUTOVR in files that are used in the System/36™ environment..</p>
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<p>When
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selected fields in a record that has already been displayed are to be changed,
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an output or an input/output operation sent to the record with the PUTOVR,
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OVRDTA, and OVRATR keywords in effect changes only the fields for which the
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OVRDTA or OVRATR keyword is in effect. The OVRDTA keyword permits a change
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in the data contents of the field and the OVRATR keyword permits a change
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in the display attributes of the field. The way in which fields are to be
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changed is controlled by setting option indicators.</p>
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<div class="p">The following conditions
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cause the Put-Override keywords to be ignored and no error to occur: <ul><li>PUTOVR is not in effect at the time of the output operation.</li>
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<li>Neither the OVRDTA nor OVRATR keyword is in effect at the time of the
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output operation.</li>
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<li>The record format is not already on the display.</li>
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</ul>
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</div>
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<p>The PUTOVR and OVRDTA keywords must be specified when DFT is specified
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for a named output-capable field. When the PUTOVR and OVRDTA keywords are
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both in effect for a field, the default value specified with the DFT keyword
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is displayed only on the first display of the field. On subsequent displays
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with the PUTOVR and OVRDTA keywords in effect, the program value is displayed.</p>
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<div class="p">If
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a field is not displayed on the first output operation to a record format,
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certain restrictions apply. These restrictions apply when, on a subsequent
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output operation, the field is selected for display and the put-override keywords
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are also in effect: <ul><li>For output-only fields for which the OVRDTA or OVRATR keyword is selected,
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the <span class="keyword">i5/OS™</span> operating system
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does not send an ending attribute character. Any display attributes (such
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as reverse image) are continued across the display until the beginning attribute
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character of the next field on the display. You should display output-only
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fields on the first output operation (perhaps with the DSPATR(ND) keyword
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so they cannot be seen) in order to provide an ending attribute character
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for later overrides.</li>
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<li>For input-capable or message fields for which the OVRDTA or OVRATR keyword
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is selected, the <span class="keyword">i5/OS</span> operating
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system sends an ending attribute character. This field must be displayed on
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the initial output operation.</li>
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</ul>
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</div>
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<p>The PUTRETAIN keyword and the PUTOVR keyword cannot be specified
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on the same record format.</p>
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<p>The OVRDTA keyword is permitted
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only with output-only (usage O), input/output (usage B), program-to-system
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(usage P), or message (usage M) fields.</p>
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<p>The OVRATR keyword is permitted
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only with output-only (usage O), input-only (usage I), or input/output (usage
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B) fields.</p>
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<p>If you specify PUTOVR, you should also specify RSTDSP(*YES)
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on the Create Display File (CRTDSPF) or Change Display File (CHGDSPF) command.
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Otherwise, data on the display can be lost if the file is suspended.</p>
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<p>A
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warning message is sent at file creation time if the PUTOVR keyword is specified
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on a record with the DSPMOD keyword. At run time, the PUTOVR keyword is ignored
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when the display mode changes.</p>
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<div class="p">The OVRATR keyword can be used only to
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override the following display attributes: <p>CHECK(ER)<br />
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CHECK(ME)<br />
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DUP<br />
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DSPATR (all except OID and SP)</p>
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</div>
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<p>An output operation
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with the OVRDTA keyword in effect does not need to have the OVRATR keyword
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in effect to override display attributes, as well as data contents, of the
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field or fields being overridden.</p>
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<p>Option indicators are valid for the
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PUTOVR, OVRATR, and OVRDTA keywords.</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Example</h4><p>The following example shows how to specify
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the PUTOVR, OVRATR, and OVRDTA keywords.</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A R INVRCD PUTOVR
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00020A FLD1 1 26'INVENTORY REMAINING IN WAREHOUSE 1'
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00030A*
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00040A 3 2'Remaining on hand:'
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00050A OVRATR
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00060A 11 DSPATR(HI)
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00070A*
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00080A INVBAL 5Y 0 +2
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00090A 12 OVRDTA
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00100A*
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00110A +2'Low on stock' OVRATR
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00120A N70 DSPATR(ND)
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00130A 70 DSPATR(HI)
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00140A*
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00150A SUPPPL 20 B 5 2DFT('INTERNAL')
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00160A 13 OVRDTA
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00170A*
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00180A ACCT 20 6 2OVRDTA
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00190A DSPATR(HI)
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00200A 14 DSPATR(RI)
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A</pre>
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<div class="p">An initial output operation generates a full display
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of information; on a second output operation, PUTOVR is in effect and the
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program can set option indicators to make the following changes to the display:
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<ul><li>If option indicator 11 is set on, the <em>Remaining on hand:</em> constant
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field will be changed to a highlighted field. To reset the display attribute
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to normal, display the record format again with option indicator 11 off.</li>
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<li>If option indicator 12 is set on, the program can change the displayed
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value of the field INVBAL.</li>
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<li>If option indicator 70 is set off, the <em>Low on stock</em> constant field
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is a nondisplay field. If option indicator 70 is set on, the field is changed
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to a highlighted field.</li>
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<li>If option indicator 13 is set on, the program can set the value of the
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field SUPPL to override the default value (INTERNAL). The first displayed
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value is always INTERNAL; to display the value INTERNAL again after changing
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it to something else, the program must set the value of the field to INTERNAL
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before displaying it again.</li>
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<li>If option indicator 14 is set on, the display attribute of the field ACCT
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is changed from highlight to highlight and reverse image at the same time
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that new data is sent to the field. If option indicator 14 is set off, the
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display attribute is changed back to highlight. New data is sent to the display
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on each output operation.</li>
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</ul>
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</div>
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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="relref"><strong>Related reference</strong><br />
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<div><a href="rzakcmstdfdft.htm" title="Use this field-level keyword to specify the constant value for constant fields (unnamed fields) and to specify a default value for named fields.">DFT (Default) keyword for display files</a></div>
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<div><a href="rzakcmstdfovdta.htm" title="Use this field- or record-level keyword with the PUTOVR keyword to override the existing data contents of a field or record already on the display.">OVRDTA (Override Data) keyword for display files</a></div>
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</div>
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</div>
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