186 lines
11 KiB
HTML
186 lines
11 KiB
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<meta name="DC.Title" content="BLANKS (Blanks) keyword for display files" />
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<meta name="abstract" content="This field-level keyword, when specified for a numeric, input-capable field, enables your program to distinguish when the field is blank and when the field is zero on the display. In either case, your program recognizes zeros." />
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<meta name="description" content="This field-level keyword, when specified for a numeric, input-capable field, enables your program to distinguish when the field is blank and when the field is zero on the display. In either case, your program recognizes zeros." />
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<meta name="DC.subject" content="BLANKS (Blanks) keyword" />
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<meta name="keywords" content="BLANKS (Blanks) keyword" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2001, 2006" />
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<title>BLANKS (Blanks) keyword for display files</title>
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</head>
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<body id="rzakcmstdfblank"><a name="rzakcmstdfblank"><!-- --></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">BLANKS (Blanks) keyword for display files</h1>
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<div><p>This field-level keyword, when specified for a numeric, input-capable
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field, enables your program to distinguish when the field is blank and when
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the field is zero on the display. In either case, your program recognizes
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zeros.</p>
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<div class="section"><p>The BLANKS keyword sets on the specified response indicator when
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the field is blank on the display. After an input operation, your program
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can test this indicator to determine that the field (whose program value is
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zero) is actually blank on the display. The field can contain all blanks (hex
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40) or all nulls (hex 00). It still appears blank to the display station user.
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If the indicator is off, the field is zero on the display.</p>
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<p>This keyword
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is also valid for character fields, but there is generally no need to specify
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it for them. Your program can test character fields directly to determine
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what is on the display.</p>
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<p>See the <a href="s36env.htm">System/36 environment considerations for display files</a> topic
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for special considerations when you specify the BLANKS keyword in files that
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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>BLANKS(response-indicator ['text'])</pre>
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</div>
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<p>The
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response indicator associated with the BLANKS keyword should be unique within
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the record. That is, the same response indicator should not be used with other
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keywords, such as CHANGE, DUP, or VLDCMDKEY; with any of the keywords for
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function keys; or with the BLANKS keyword on other fields in the same record.
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This is because the <span class="keyword">i5/OS™</span> operating
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system always turns the response indicator off if the field contains non-blank
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characters on an input operation. The <span class="keyword">i5/OS</span> operating
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system does this to make sure that when the field appears as all blanks, the
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response indicator is set on, and that when it does not appear as all blanks,
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the response indicator is set off.</p>
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<p>The optional text is included on
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the list generated at program compilation time to explain the intended use
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of the indicator. This text has no function in the file or the program other
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than as a comment. The single quotation marks are required. If you specify
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more than 50 characters between the single quotation marks, the text is truncated
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to 50 characters on the program list.</p>
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<p>Option indicators are not valid
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for this keyword.</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Example 1: Specify the BLANKS keyword</h4><p>The following
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example shows how to specify the BLANKS keyword.</p>
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<div class="note"><span class="notetitle">Note:</span> Examples 2, 3, and
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4 in this topic, show some cases that restrict the BLANKS keyword.</div>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00030A QTY1 5Y 0B 5 2BLANKS(01 'ON=QTY1 IS ALL BLANKS')
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00040A QTY2 5Y 0B 6 2BLANKS(02 'ON=QTY2 IS ALL BLANKS')
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00050A QTY3 5Y 0B 7 2BLANKS(03 'ON=QTY3 IS ALL BLANKS')
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A</pre>
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<p>Three numeric fields (QTY1, QTY2, and
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QTY3) are displayed. If the display station user types values into the fields
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and presses the Enter key, the following situation occurs:</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="void" border="0" rules="none"><thead align="left"><tr><th align="left" valign="bottom" width="33.33333333333333%" id="d0e64">Value as typed into fields</th>
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<th align="left" valign="bottom" width="33.33333333333333%" id="d0e66">Value as passed to program</th>
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<th align="left" valign="bottom" width="33.33333333333333%" id="d0e68">Condition of response indicator</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e64 ">100</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e66 ">00100</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e68 ">Off</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e64 ">0</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e66 ">00000</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e68 ">Off</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e64 ">Blanks</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e66 ">00000</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e68 ">On</td>
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</tr>
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<tr><td colspan="3" align="left" valign="top" headers="d0e64 d0e66 d0e68 "><div class="note"><span class="notetitle">Note:</span> If the
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display station user presses a Field Exit key or the Erase Input key, the
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field appears blank because it contains nulls.</div>
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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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</div>
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<div class="section"><h4 class="sectiontitle">Restrict the BLANKS keyword</h4><p>In some cases, the BLANKS
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keyword does not set the specified response indicator on but rather restricts
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its function. Examples 2, 3, and 4 in this topic, illustrate these cases.</p>
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<div class="note"><span class="notetitle">Note:</span> Other
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cases occur when the field is a character field, but then it is unnecessary
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to use the BLANKS keyword.</div>
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</div>
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<div class="example"><h4 class="sectiontitle">Example 2</h4> <p>In the following example, when an input/output
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field contains all blanks (hex 40) or all nulls (hex 00) when displayed, and
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certain keywords affecting the display of the field are also specified, the
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response indicator is not set on.</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A* When OVRATR is specified
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00020A R REC1 PUTOVR
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00030A FLD1 10 0B 2 2BLANKS(50) OVRATR
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00040A 78 DSPATR(HI)
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00050A* When PUTRETAIN is specified
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00060A R REC2 PUTRETAIN OVERLAY
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00070A FLD2 10 0B 2 2BLANKS(50)
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00080A R REC3 OVERLAY
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00090A FLD3 10 0B 2 2BLANKS(50)
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A PUTRETAIN
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A</pre>
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<p>For all record formats in this example, response indicator
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50 is set on as expected the first time the field is read by the program (if
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the field appears blank on the display). However, after a subsequent display,
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response indicator 50 is set on again <em>only if the display station user
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again blanks the field</em>. If the workstation user does not again blank the
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field, response indicator 50 is off.</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Example 3</h4><p>Examples 2 and 4 concern cases when the
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field is first displayed, then deleted.</p>
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<p>In the following example, when
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an input-capable field is overlapped by another field, causing the first field
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to be deleted, the response indicator is not set on (even though the field
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in the input buffer still contains all blanks or all nulls).</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A R REC4 OVERLAY
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00020A 15 FLDA 10 0B 2 2
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00030A FLD4 10 0B 2 5BLANKS(50)
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A</pre>
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<p>In this example, if option indicator 15 is off when REC4
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is first displayed, FLD4 is displayed and FLDA is not. When REC4 is read,
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response indicator 50 is set on if FLD4 is blank. If option indicator 15 is
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then set on when REC4 is displayed again, FLDA overlaps FLD4 and deletes it.
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Response indicator 50 is then off when REC4 is read. (This occurs because
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the <span class="keyword">i5/OS</span> operating system
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turns it off when displaying the record format and does not turn it back on
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for a field that is not on the display, even if the field contains blanks
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or nulls from a previous I/O operation.)</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Example 4</h4><p>In the following example, after initial
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display, an input/output field is not displayed again on a subsequent input/output
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operation (even though the field in the input buffer still contains all blanks
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or all nulls).</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A R REC5 ERASEINP OVERLAY
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00020A 20 FLD5 10 0B 2 2BLANKS(50)
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00030A*
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00040A R REC6 ERASEINP OVERLAY MDTOFF
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00050A 20 FLD6 10 0B 2 2BLANKS(50) DSPATR(MDT)
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A</pre>
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<p>In this example, if option indicator 20 is on when REC5
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or REC6 is first displayed, FLD5 or FLD6 is displayed. When REC5 or REC6 is
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read, response indicator 50 is set on if FLD5 or FLD6 is blank. However, if
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option indicator 20 is set off on a second display, FLD5 or FLD6 is not 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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</html>
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