162 lines
9.4 KiB
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162 lines
9.4 KiB
HTML
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<title>CLRL (Clear Line) 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">CLRL (Clear Line) keyword for display files</h1>
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<div><p>Use this record-level keyword to specify that the <span class="keyword">i5/OS™</span> operating
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system is to clear (delete) a specific number of lines before the record is
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displayed. Only those lines are cleared. </p>
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<div class="section"> <div class="note"><span class="notetitle">Note:</span> As with OVERLAY, other records remain on the display.</div>
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<p>See
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the <a href="../books/sc415715.pdf" target="_blank">Application
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Display Programming book</a><img src="wbpdf.gif" alt="Link to PDF" /> for information about how to use CLRL in files that are used in the System/36™ environment.</p>
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<p>The
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format of the keyword is:</p>
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<pre>CLRL(nn|*END|*NO|*ALL)</pre>
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<p>You
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can specify the CLRL keyword in one of the following ways:</p>
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<ul><li>Specify nn, where nn is an integer between 1 and 27. The number specified
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is the number of lines cleared, starting with and including the first line
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on which the record is to be displayed. If the SLNO (Starting Line Number)
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keyword is also specified for this record format, the clearing of lines begins
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with the starting line number in effect for the record format at the time
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it is displayed. <div class="note"><span class="notetitle">Note:</span> When specifying nn, the record must have at least one
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field defined.</div>
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</li>
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<li>Specify *END to indicate that all lines starting with and including the
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first line on which the record is to be displayed are to be cleared. For a
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24 x 80 display, lines up to and including line 24 are cleared. For a 27 x
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132 display, lines up to and including line 27 are cleared.</li>
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<li>Specify *NO so that no lines on the display are cleared before displaying
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the record whose format you are defining. The displayed record overlays any
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data already on the display.</li>
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<li>Specify *ALL so that all of the lines on the display are cleared before
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displaying the record whose format you are defining. At least one field must
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be defined in the record format.</li>
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</ul>
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<p>When a record format begins with a field in position 1, the beginning
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attribute byte of the format is in the last position of the previous line.
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The previous line number is the starting line number in the format. This also
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applies to a SLNO format with a field defined in the DDS in line 1, position
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1.</p>
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<p>If the record format for which the CLRL keyword is specified has
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one or more input-capable fields, any records that are overlaid are no longer
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recognized by the <span class="keyword">i5/OS</span> operating
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system. That is, any input-capable fields can no longer be typed into, any
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input operation written to one of those records results in an error, and they
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cannot be cleared by selecting the ERASE keyword.</p>
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<p>If you specify the
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CLRL(nn) keyword in a record format without input-capable fields, the input-capable
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fields in the overlapped records remain input-capable. That is, input-capable
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fields in the overlaid records remain input-capable, and input operations
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written to those record formats are still valid. If the ROLLUP or ROLLDOWN
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keywords are specified on the record containing the CLRL keyword, they are
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ignored. Records with the CLRL keyword and no input-capable fields are not
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cleared properly when they are overlaid by other records that have the OVERLAY
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keyword specified. The lines needed for the overlapping record are cleared
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and the lines not needed for the overlapping record remain on the display.</p>
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<p>You
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can use the CLRL(*NO) keyword to prevent an overlapped record from being cleared
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when the overlapping record is written to the display. If you use this keyword,
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any records being displayed that are to be overlapped are not cleared from
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the display. The new record overlays them entirely or partially. There is
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a performance advantage to using CLRL(*NO) if you have a display containing
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constants and data that is repeatedly sent to the display. Sending constants
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as a separate format and using the CLRL(*NO) keyword for the format containing
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the data reduces the time required to send the record format to the display.</p>
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<p>If
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the CLRL keyword is not specified and neither OVERLAY nor PUTOVR (Put with
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Explicit Override) is specified, the entire display is cleared.</p>
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<p>If
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the CLRL keyword is used and the PUTOVR or PUTRETAIN keyword is in effect,
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the clearing of any lines might conflict with the PUTOVR or PUTRETAIN function.
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The PUTOVR or PUTRETAIN keyword requires that the fields being overridden
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be on the display, while the CLRL(nn) or CLRL(*END) keyword clears those fields
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first. If a record becomes unavailable for input because of the CLRL(nn) or
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CLRL(*END) keyword, the input-capable fields remain input-capable if the PUTOVR
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keyword is in effect. However, the <span class="keyword">i5/OS</span> operating
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system sends a message if the program attempts to read such a record.</p>
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<p>If
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you specify the CLRL keyword, you should also specify RSTDSP(*YES) on the
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Create Display File (CRTDSPF) or Change Display File (CHGDSPF) command. Otherwise,
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data on the display can be lost if the file is suspended.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Prevent overlapped records from being cleared</h4><p>The
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CLRL keyword cannot be specified with any of the following keywords:</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="void" border="0" rules="none"><tbody><tr><td valign="top" width="50%"><p>ASSUME<br />
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KEEP<br />
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SFL</p>
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</td>
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<td valign="top" width="50%"><p>SFLCTL<br />
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USRDFN</p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>A warning message appears at file creation time if the CLRL keyword
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is specified on a record with the DSPMOD keyword. At run time, the CLRL keyword
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is ignored when the display mode changes.</p>
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<p>The CLRL keyword cannot be
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specified for the record format specified by the PASSRCD keyword.</p>
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<p>Option
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indicators are not valid for this keyword.</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 CLRL keyword.</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A R RECORD1 CLRL(5)
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00020A FLD1 5 3 2
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00030A FLD2 10 OB 5 2
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00040A FLD3 10 I 6 2
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00050A*
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00060A R RECORD2 CLRL(*NO)
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00070A FLD1 5 2 2 2
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00080A FLD2 5 H
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00090A FLD3 10 I 4 2
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00100A*
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00110A R RECORD3 CLRL(*END)
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00120A FLD1 5 B 5 2
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00130A FLD2 5 I 8 2
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A</pre>
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<p>Lines 3, 4, 5, 6, and 7 are cleared before RECORD1 is
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displayed. In RECORD2, no lines are cleared, and when the record is displayed,
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it will overlay anything already displayed. Lines 5 through 24 are cleared
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before RECORD3 is displayed.</p>
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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>
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</body>
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