144 lines
8.0 KiB
HTML
144 lines
8.0 KiB
HTML
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="CHOICE (Selection Field Choice) keyword for display files" />
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<meta name="abstract" content="Use this field-level keyword to define a choice for a selection field." />
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<meta name="description" content="Use this field-level keyword to define a choice for a selection field." />
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<meta name="DC.subject" content="CHOICE (Selection Field Choice) keyword, Selection Field Choice (CHOICE) keyword, selection field choice, defining" />
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<meta name="keywords" content="CHOICE (Selection Field Choice) keyword, Selection Field Choice (CHOICE) keyword, selection field choice, defining" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2001, 2006" />
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<title>CHOICE (Selection Field Choice) keyword for display files</title>
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</head>
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<body id="rzakcmstchoice"><a name="rzakcmstchoice"><!-- --></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">CHOICE (Selection Field Choice) keyword for display files</h1>
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<div><p>Use this field-level keyword to define a choice for a selection
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field.</p>
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<div class="section"><p>The format of the keyword is:</p>
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<pre>CHOICE(choice-number choice-text [*SPACEB])</pre>
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<p>The
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choice-number parameter defines an identification number for this choice.
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This parameter is required. The choice number returns to the application to
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indicate which choice in the selection field was selected. On non-graphical
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displays, the choice number is also displayed to the left of the choice text.
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Valid values for the choice-number are positive integers greater than 0 and
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less than or equal to 99. Duplicate choice-number values within a selection
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field are not allowed.</p>
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<p>The choice-text parameter defines the text that
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appears in the selection field for the choice. This parameter is required.
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The parameter can be specified in one of two forms:</p>
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<ul><li>As a character string: 'Choice text '</li>
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<li>As a program-to-system field: &field-name</li>
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</ul>
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<p>The field specified must exist in the same record as the selection
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field and must be defined as a character field with usage P.</p>
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<p>The
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choice text for all choices within a selection field must fit on the display
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for the smallest display size specified in the file. Therefore, the maximum
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length for the choice text depends on the following items:</p>
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<ul><li>The position of the selection field</li>
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<li>The length of the longest choice number that is displayed to the left
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of the choice</li>
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<li>The length of the choice text itself</li>
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<li>The number of columns in the selection field</li>
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<li>The width of the gutter between columns</li>
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</ul>
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<p>If the smallest display size is 24 x 80, the above must be less than
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or equal to 80. If the smallest display size specified is 27 x 132, this sum
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must be less than or equal to 132.</p>
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<p>Within the choice text, you can specify
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a mnemonic for the choice by using a greater than character (>) to indicate
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the mnemonic character. The character to the right of the > is the mnemonic.
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The mnemonic is used only on a character-based graphical display attached
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to a controller that supports an enhanced interface for nonprogrammable workstations,
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where the choices are rendered using radio buttons. The mnemonic is ignored
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on displays where the field is rendered using numeric selection, since the
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system does not support both numeric and mnemonic selection on a selection
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field. Examples of specifying mnemonics:</p>
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<dl><dt><strong>Choice text</strong></dt>
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<dd><strong>Appears as</strong></dd>
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<dt class="dlterm">'>File'</dt>
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<dd><u>F</u>ile</dd>
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<dt class="dlterm">'F>inish'</dt>
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<dd>F<u>i</u>nish</dd>
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<dt class="dlterm">'Save >As...'</dt>
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<dd>Save <u>A</u>s...</dd>
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<dt class="dlterm">'X >= 1'</dt>
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<dd>X <u>=</u> 1</dd>
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</dl>
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<p>In order to specify > as a character in the text, you
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must specify it twice, just as you must specify the apostrophe character twice
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in order to get a single apostrophe character in the text. For example:</p>
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<dl><dt><strong>Choice text</strong></dt>
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<dd><strong>Appears as</strong></dd>
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<dt class="dlterm">'X >>= 1'</dt>
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<dd>X >= 1</dd>
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<dt class="dlterm">'X >>>= 1'</dt>
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<dd>X ><u>=</u> 1</dd>
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</dl>
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<div class="note"><span class="notetitle">Note:</span> It is not possible to specify the > as the mnemonic.</div>
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<p>The
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mnemonic character indicated must be a single-byte character and must not
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be a blank. Only one mnemonic is allowed in the choice text, and the same
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mnemonic character cannot be specified for more than one choice.</p>
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<p>The
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*SPACEB parameter is optional and indicates that a blank space (or line) should
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be inserted before this choice. This parameter is used to specify logical
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grouping of choices that are numbered consecutively.</p>
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<p>For vertical selection
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fields (selection fields arranged in a single column), if the choice numbers
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are not consecutive, a blank space is automatically inserted between non-consecutive
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choices. This does not happen for horizontal selection fields (selection fields
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arranged in multiple columns).</p>
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<p>When the CHOICE keyword is specified
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on a field, either the SNGCHCFLD or the MLTCHCFLD keyword must also be specified.</p>
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<p>Several
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CHOICE keywords can be specified for one selection field. The maximum number
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of CHOICE keywords that can be specified depends on the position of the selection
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field and the display size. All choices must fit on the smallest display size
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specified for the file.</p>
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<p>Option indicators are valid for this keyword.
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When a CHOICE keyword is turned off, the list of choices is compressed.</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 CHOICE keyword:</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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A R RECORD
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A F1 2Y 0B 1 2SNGCHCFLD
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A 01 CHOICE(1 '>Undo ')
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A CHOICE(2 &MARKTXT);
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A CHOICE(3 '>Copy ')
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A MARKTXT 12A P
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A</pre>
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<p>In this example, three choices are defined for the single-choice
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selection field F1. The text for choice 2 is contained in field MARKTXT, and
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the mnemonic for choice 2 must be contained in the text supplied by the application
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at run time. If indicator 01 is off when the record is written, only choices
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2 and 3 are 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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