169 lines
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HTML
169 lines
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<meta name="abstract" content="Use this field-level keyword in the subfile control record format to specify that the workstation user can type a value into this field to tell the i5/OS operating system how many records to page up or down when the appropriate paging key is pressed." />
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<title>SFLROLVAL (Subfile Roll Value) keyword for display files</title>
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<body id="rzakcmstdfsfrol"><a name="rzakcmstdfsfrol"><!-- --></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">SFLROLVAL (Subfile Roll Value) keyword for display files</h1>
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<div><p>Use this field-level keyword in the subfile control record format
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to specify that the workstation user can type a value into this
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field to tell the <span class="keyword">i5/OS™</span> operating
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system how many records to page up or down when the appropriate paging key
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is pressed.</p>
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<div class="section"><p>This field must have the keyboard shift attribute of signed numeric
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with zero decimal positions. It can be up to 4 digits in length, and it must
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be defined as an input/output or input-only field.</p>
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<p>This keyword has
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no parameters.</p>
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<p>The workstation user can page through the data being
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displayed up or down by first typing in the number of records to page through
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and then pressing the Page Up or the Page Down key. (On subsequent pages,
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the SFLROLVAL value stays the same unless a new number is typed in before
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paging.) If a negative number or zero is typed into this field and a Page
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key is pressed, an error message is displayed at the workstation.</p>
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<p>This
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keyword is valid only for the subfile control record format. You must specify
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it if the <span class="keyword">i5/OS</span> operating
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system is to support the page-by-record function.</p>
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<p>If this keyword is
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not specified, the <span class="keyword">i5/OS</span> operating
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system pages through the display by the SFLPAG value except for subfiles using
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the SFLDROP keyword. If using the SFLDROP keyword, more records are displayed
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than the SFLPAG value when records are displayed in the truncated format.
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For truncated records, the <span class="keyword">i5/OS</span> operating
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system pages through the display by the number of records displayed in the
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truncated format.</p>
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<p>If subfile size equals subfile page, SFLROLVAL is
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ignored. When several display sizes are used (DSPSIZ keyword specified), SFLROLVAL
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is ignored only for display sizes for which subfile size equals subfile page.
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If the subfile record format contains field selection, SFLROLVAL is not valid.</p>
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<p>This
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field is returned to your program as part of the input for this subfile control
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record.</p>
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<div class="p">If pressing the Page Up key pages beyond the first page of records
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of the subfile, one of the following conditions occurs: <ul><li>If the first page of records is not currently displayed, paging up will
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display it.</li>
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<li>If the first page of records is currently displayed, paging up will cause
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a message to be displayed.</li>
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</ul>
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</div>
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<div class="p">If pressing the Page Down key pages beyond the last active record
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of the subfile, one of the following conditions occurs: <ul><li>If the last full page of records is not already displayed, typing Page
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Down will display it.</li>
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<li>If the last full page of records is already displayed, typing Page Down
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will cause a message to be displayed. One exception to this rule is that when
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the SFLROLVAL value is less than the SFLPAG value, the <span class="keyword">i5/OS</span> operating
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system pages through the subfile again and no message is displayed.</li>
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</ul>
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</div>
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<div class="p">Certain keywords are helpful when specified with SFLROLVAL: <ul><li>The SFLEND keyword notifies the workstation user when the last subfile
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record is displayed.</li>
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<li>The PAGEUP or PAGEDOWN keywords cause control to return to the program
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when pressing a Page Up or a Page Down key can page beyond the end of the
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subfile. Without PAGEUP(ROLLDOWN) or PAGEDOWN(ROLLUP), a message is displayed
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(as described previously).</li>
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</ul>
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<div class="note"><span class="notetitle">Note:</span> The ROLLUP keyword is the same as the PAGEDOWN keyword and the
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ROLLDOWN keyword is the same as the PAGEUP keyword.</div>
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</div>
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<div class="p">The following
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examples illustrate the use of SFLROLVAL: <ul><li>Paging Up. Assume that the value specified for SFLPAG is 3, and there
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are 11 active records in the subfile. If records 8 through 10 are currently
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being displayed, and the user types a page value greater than 7, pressing
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the Page Up key displays records 1 through 3. <p>If records 1 through 3 are
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currently displayed, and a Page Up key is entered with a SFLROLVAL value greater
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than 0, either a message is sent to the workstation user (PAGEUP not specified)
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or control is returned to the user program (PAGEUP specified; the program
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has responsibility for paging down).</p>
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</li>
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<li>Paging Down. Assume that the value specified for SFLPAG is 3, and there
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are 11 active records in the subfile. If records 8 through 10 are currently
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being displayed, and the user enters a 3 into the SFLROLVAL field, pressing
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the Page Down key displays record 11 in the uppermost page area of the display.
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Any lines not occupied by that record are blank. If the Page Down key is pressed
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again, the last full page of subfile records (records 9 through 11) are displayed.
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Finally, if the Page Down key is pressed a third time, either a message is
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sent to the workstation user (PAGEDOWN not specified) or control is returned
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to the user program (PAGEDOWN specified; the program has responsibility for
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paging down).</li>
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</ul>
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</div>
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<div class="p">The following shows the conditions that occur when paging beyond
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the ends of the subfile (when the SFLROLVAL value is greater than the SFLPAG
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value). <ul><li>On pressing the Page Down key: <ul><li>If the last full page of records is not already displayed, then it is
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displayed.</li>
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<li>If the last full page of records is already displayed, then a message
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is displayed.</li>
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</ul>
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</li>
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<li>On pressing the Page Down key a second time: <ul><li>If PAGEDOWN is specified, control returns to your program.</li>
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<li>If PAGEDOWN is not specified, a message is displayed.</li>
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</ul>
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</li>
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<li>On pressing the Page Up key: <ul><li>If the first page of the subfile is not already displayed, then it is
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displayed.</li>
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<li>If the first page of the subfile is already displayed, then: <ul><li>If PAGEUP is specified, control returns to your program.</li>
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<li>If PAGEUP is not specified, a message is displayed.</li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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<p>You cannot specify both the SFLROLVAL and the SFLRCDNBR keywords
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for the same field.</p>
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<p>Option 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 SFLROLVAL keyword.</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A R SFLR SFL
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A*
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A* (at least one displayable field)
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A*
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00040A R SFLCTLR SFLCTL(SFLR)
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00050A SFLPAG(17)
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00060A SFLSIZ(17)
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00070A SFLDSP SFLDSPCTL
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00080A ROLVAL 4S 0B 1 47SFLROLVAL
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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="relref"><strong>Related reference</strong><br />
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<div><a href="rzakcmstdfalwr.htm" title="Use this record-level keyword to allow your program to page through data in a window on the display when displaying the record format you are defining.">ALWROL (Allow Roll) keyword for display files</a></div>
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<div><a href="rzakcmstdfslend.htm" title="Use this record-level keyword on the subfile control record format to permit the display of a plus sign (+) or text (More… or Bottom) in the lower-right display location occupied by the subfile or a scroll bar.">SFLEND (Subfile End) keyword for display files</a></div>
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</div>
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</div>
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