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    <p><strong>NOTE: See EDIT below for a different approach than the one given here</strong></p> <p>How about <code>requirementConstraint</code>?</p> <pre><code>&lt;my:customSelect requirementConstraint="Mandatory"&gt; &lt;option value="1"&gt;A&lt;/option&gt; &lt;option value="2"&gt;B&lt;/option&gt; &lt;option value="3"&gt;C&lt;/option&gt; &lt;/my:customSelect&gt; </code></pre> <p>Another possiblity is not to tri-state the value in the first place. For example, you can instead provide two separate properties: <code>required</code> (<code>"yes" | "no"</code>), and <code>selectAll</code> (<code>"yes" | "no"</code>) to make the intent clearer.</p> <hr/> <p><strong>EDIT</strong>: Actually, I can see how a tri-state might still be useful, if I understand your requirements correctly. Another possibility would be to call the property <code>mustSelect</code> and make the allowed values <code>one</code> (mandatory), <code>any</code> (optional), and <code>all</code> (select all). Also, since "Select All" is a possibility, I'm assuming your <code>customSelect</code> tag renders each option as a checkbox. An example of how <code>mustSelect</code> might be used:</p> <p><strong>Mandatory (at least one)</strong></p> <pre><code>&lt;my:customSelect mustSelect="one"&gt; &lt;option value="1"&gt;A&lt;/option&gt; &lt;option value="2"&gt;B&lt;/option&gt; &lt;option value="3"&gt;C&lt;/option&gt; &lt;/my:customSelect&gt; </code></pre> <p><strong>Optional (zero or more)</strong></p> <pre><code>&lt;my:customSelect mustSelect="any"&gt; &lt;option value="1"&gt;A&lt;/option&gt; &lt;option value="2"&gt;B&lt;/option&gt; &lt;option value="3"&gt;C&lt;/option&gt; &lt;/my:customSelect&gt; </code></pre> <p><strong>Select all</strong></p> <pre><code>&lt;my:customSelect mustSelect="all"&gt; &lt;option value="1"&gt;A&lt;/option&gt; &lt;option value="2"&gt;B&lt;/option&gt; &lt;option value="3"&gt;C&lt;/option&gt; &lt;/my:customSelect&gt; </code></pre>
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    1. POWhat descriptive variable name can I use here?
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    1. COThanks for the effort you put into this answer! See the edit to my post to explain why they won't be checkboxes. The reason the tri-state exists is purely historical; they are mutually exclusive.
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