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<h1 id="dynamic-cell-dropdown">Dynamic Cell Dropdown<a class="headerlink" href="#dynamic-cell-dropdown" title="Permanent link">&para;</a></h1>
<p>This is a simple, but incredibly powerful feature! Configure a SAS process to run when clicking a particular cell. Data Controller will send the <em>row</em> to SAS, and your SAS program can use the values in the row determine a <em>column</em> of values to send back - which will be used in the frontend selectbox.</p>
<p>So if you'd like the user to only see products for a particular category, or ISIN's for a particular asset group, you can perform that easily.</p>
<p>This feature is used extensively in Data Controller to fetch tables specific to a library, or columns specific to a table:</p>
<p><img alt="" src="../img/cell_validation1.png" /></p>
<p>You can also use the response to populate <em>other</em> dropdowns (also in the same row) in the same request - these are called 'extended validations'.</p>
<iframe width="560" height="315" src="https://www.youtube.com/embed/rmES77aIr90" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
<h2 id="frontend-configuration">Frontend Configuration<a class="headerlink" href="#frontend-configuration" title="Permanent link">&para;</a></h2>
<p>Open the MPE_VALIDATIONS table and configure the library, table and column that should contain the selectbox. In the RULE_TYPE column, enter either:</p>
<ul>
<li>HARDSELECT_HOOK - The user entry MUST match the returned values</li>
<li>SOFTSELECT_HOOK - The user can view the list but type something else if they wish</li>
</ul>
<p>The RULE_VALUE column should contain the full path to the SAS Program, Viya Job or SAS 9 Stored process that you would like to execute. If the value ends in ".sas" then it is assumed to be a SAS program on a directory, otherwise a SAS web service (STP or Viya Job).</p>
<h2 id="backend-configuration">Backend Configuration<a class="headerlink" href="#backend-configuration" title="Permanent link">&para;</a></h2>
<p>If creating a Stored Process, be sure to deselect the 'automatic SAS macros' - the presence of %stpbegin or %stpend autocall macros will cause problems with the Data Controller backend.</p>
<p>You can write any SAS code you wish. For examples of hook scripts you can look at the Data Controller internal validation programs (listed in the MPE_VALIDATIONS table). You will receive the following as inputs:</p>
<ul>
<li><code>work.source_row</code> -&gt; A dataset containing the <strong>current row</strong> being modified in Data Controller. This will have already been created in the current SAS session. All variables are available. Use this to filter the initial values in <code>work.dynamic_values</code>.</li>
<li><code>&amp;DC_LIBREF</code> -&gt; The DC control library</li>
<li><code>&amp;LIBDS</code> - The library.dataset being filtered</li>
<li><code>&amp;VARIABLE_NM</code> - The column for which to supply the validation</li>
</ul>
<p>The following tables should be created in the WORK library as outputs:</p>
<ul>
<li><code>work.dynamic_values</code></li>
<li><code>work.dynamic_extended_values</code> (optional)</li>
</ul>
<h3 id="workdynamic_values"><code>WORK.DYNAMIC_VALUES</code><a class="headerlink" href="#workdynamic_values" title="Permanent link">&para;</a></h3>
<p>This output table can contain up to three columns:</p>
<ul>
<li><code>display_index</code> (optional, mandatory if using <code>dynamic_extended_values</code>). Is a numeric key used to join the two tables.</li>
<li><code>display_value</code> - always character</li>
<li><code>raw_value</code> - unformatted character or numeric according to source data type</li>
</ul>
<p>Example values:</p>
<table>
<thead>
<tr>
<th>DISPLAY_INDEX:best.</th>
<th>DISPLAY_VALUE:$</th>
<th>RAW_VALUE</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td>$77.43</td>
<td>77.43</td>
</tr>
<tr>
<td>2</td>
<td>$88.43</td>
<td>88.43</td>
</tr>
</tbody>
</table>
<h3 id="workdynamic_extended_values"><code>WORK.DYNAMIC_EXTENDED_VALUES</code><a class="headerlink" href="#workdynamic_extended_values" title="Permanent link">&para;</a></h3>
<p>This output table is optional. If provided, it will map the DISPLAY_INDEX from the DYNAMIC_VALUES table to additional column/value pairs, that will be used to populate dropdowns for <em>other</em> cells in the <em>same</em> row.</p>
<p>The following columns should be provided:</p>
<ul>
<li><code>display_index</code> - a numeric key joining each value to the <code>dynamic_values</code> table</li>
<li><code>extra_col_name</code> - the name of the additional variable(s) to contain the extra dropdown(s)</li>
<li><code>display_value</code> - the value to display in the dropdown. Always character.</li>
<li><code>display_type</code> - Either C or N depending on the raw value type</li>
<li><code>raw_value_num</code> - The unformatted value if numeric</li>
<li><code>raw_value_char</code> - The unformatted value if character</li>
<li><code>forced_value</code> - set to 1 to force this value to be automatically selected when the source value is changed. If anything else but 1, the dropdown will still appear, but the user must manually make the selection.</li>
</ul>
<p>Example Values:</p>
<table>
<thead>
<tr>
<th>DISPLAY_INDEX:best.</th>
<th>EXTRA_COL_NAME:$32</th>
<th>DISPLAY_VALUE:$</th>
<th>DISPLAY_TYPE:$1.</th>
<th>RAW_VALUE_NUM</th>
<th>RAW_VALUE_CHAR:$5000</th>
<th>FORCED_VALUE</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td>DISCOUNT_RT</td>
<td>"50%"</td>
<td>N</td>
<td>0.5</td>
<td></td>
<td>.</td>
</tr>
<tr>
<td>1</td>
<td>DISCOUNT_RT</td>
<td>"40%"</td>
<td>N</td>
<td>0.4</td>
<td></td>
<td>0</td>
</tr>
<tr>
<td>1</td>
<td>DISCOUNT_RT</td>
<td>"30%"</td>
<td>N</td>
<td>0.3</td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>CURRENCY_SYMBOL</td>
<td>"GBP"</td>
<td>C</td>
<td></td>
<td>"GBP"</td>
<td>.</td>
</tr>
<tr>
<td>1</td>
<td>CURRENCY_SYMBOL</td>
<td>"RSD"</td>
<td>C</td>
<td></td>
<td>"RSD"</td>
<td>.</td>
</tr>
<tr>
<td>2</td>
<td>DISCOUNT_RT</td>
<td>"50%"</td>
<td>N</td>
<td>0.5</td>
<td></td>
<td>.</td>
</tr>
<tr>
<td>2</td>
<td>DISCOUNT_RT</td>
<td>"40%"</td>
<td>N</td>
<td>0.4</td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>2</td>
<td>CURRENCY_SYMBOL</td>
<td>"EUR"</td>
<td>C</td>
<td></td>
<td>"EUR"</td>
<td>.</td>
</tr>
<tr>
<td>2</td>
<td>CURRENCY_SYMBOL</td>
<td>"HKD"</td>
<td>C</td>
<td></td>
<td>"HKD"</td>
<td>1</td>
</tr>
</tbody>
</table>
<h3 id="code-examples">Code Examples<a class="headerlink" href="#code-examples" title="Permanent link">&para;</a></h3>
<p>Simple dropdown</p>
<div class="highlight"><pre><span></span><code><span class="cm">/**</span>
<span class="cm"> @file</span>
<span class="cm"> @brief Simple dynamic cell dropdown for product code</span>
<span class="cm"> @details The input table is simply one row from the</span>
<span class="cm"> target table called &quot;work.source_row&quot;.</span>
<span class="cm"> Available macro variables:</span>
<span class="cm"> @li DC_LIBREF - The DC control library</span>
<span class="cm"> @li LIBDS - The library.dataset being filtered</span>
<span class="cm"> @li VARIABLE_NM - The column being filtered</span>
<span class="cm"> &lt;h4&gt; Service Outputs &lt;/h4&gt;</span>
<span class="cm"> Output should be a single table called</span>
<span class="cm"> &quot;work.dynamic_values&quot; in the format below.</span>
<span class="cm"> |DISPLAY_VALUE:$|RAW_VALUE:??|</span>
<span class="cm"> |---|---|</span>
<span class="cm"> |$44.00|44|</span>
<span class="cm">**/</span>
<span class="nf">%dc_assignlib</span>(READ,mylibref)
<span class="kr">proc sql;</span>
<span class="k">create</span> <span class="k">table</span> work<span class="m">.</span>DYNAMIC_VALUES <span class="k">as</span>
<span class="k">select</span> <span class="k">distinct</span> some_product <span class="k">as</span> raw_value
<span class="k">from</span> mylibref<span class="m">.</span>my_other_table
<span class="k">where</span> area <span class="k">in</span> (<span class="k">select</span> area <span class="k">from</span> work<span class="m">.</span>source_row)
<span class="k">order</span> <span class="k">by</span> <span class="m">1</span>;
</code></pre></div>
<p>Extended dropdown</p>
<div class="highlight"><pre><span></span><code><span class="kr">proc sql;</span>
<span class="k">create</span> <span class="k">table</span> work<span class="m">.</span>source <span class="k">as</span>
<span class="k">select</span> libref,dsn
<span class="k">from</span> <span class="nv">&amp;DC_LIBREF.</span>.MPE_TABLES
<span class="k">where</span> tx_to &gt; <span class="s">&quot;%sysfunc(datetime(),E8601DT26.6)&quot;</span>dt
<span class="k">order</span> <span class="k">by</span> <span class="m">1</span>,<span class="m">2</span><span class="kr">;</span>
<span class="kr">data </span>work<span class="m">.</span>DYNAMIC_VALUES (<span class="k">keep</span>=display_index raw_value display_value);
<span class="k">set</span> work<span class="m">.</span>source <span class="k">end</span>=last;
<span class="k">by</span> libref;
<span class="k">if</span> last<span class="m">.</span>libref <span class="k">then</span> <span class="k">do</span>;
display_index<span class="m">+1</span>;
raw_value=libref;
display_value=libref;
<span class="k">output</span>;
<span class="k">end</span>;
<span class="k">if</span> last <span class="k">then</span> <span class="k">do</span>;
display_index<span class="m">+1</span>;
raw_value=<span class="s">&#39;*ALL*&#39;</span>;
display_value=<span class="s">&#39;*ALL*&#39;</span>;
<span class="k">output</span>;
<span class="k">end</span><span class="kr">;</span>
<span class="kr">run;</span>
<span class="kr">data </span>work<span class="m">.</span>dynamic_extended_values(<span class="k">keep</span>=display_index extra_col_name display_type
display_value RAW_VALUE_CHAR raw_value_num forced_value);
<span class="k">set</span> work<span class="m">.</span>source <span class="k">end</span>=last;
<span class="k">by</span> libref dsn;
<span class="k">retain</span> extra_col_name <span class="s">&#39;ALERT_DS&#39;</span>;
<span class="k">retain</span> display_type <span class="s">&#39;C&#39;</span>;
<span class="k">retain</span> raw_value_num .;
raw_value_char=dsn;
display_value=dsn;
forced_value=<span class="m">0</span>;
<span class="k">if</span> first<span class="m">.</span>libref <span class="k">then</span> display_index<span class="m">+1</span>;
<span class="k">if</span> last<span class="m">.</span>libref <span class="k">then</span> <span class="k">do</span>;
display_value=<span class="s">&#39;*ALL*&#39;</span>;
raw_value_char=<span class="s">&#39;*ALL*&#39;</span>;
forced_value=<span class="m">1</span>;
<span class="k">output</span>;
<span class="k">end</span>;
<span class="k">else</span> <span class="k">output</span>;
<span class="k">if</span> last <span class="k">then</span> <span class="k">do</span>;
display_value=<span class="s">&#39;*ALL*&#39;</span>;
raw_value_char=<span class="s">&#39;*ALL*&#39;</span>;
forced_value=<span class="m">1</span>;
<span class="k">output</span>;
<span class="k">end</span><span class="kr">;</span>
<span class="kr">run;</span>
</code></pre></div>
<h2 id="technical-notes">Technical Notes<a class="headerlink" href="#technical-notes" title="Permanent link">&para;</a></h2>
<p>When first clicking on a 'dynamic dropdown' cell, the frontend will first hash the entire row, and store the subsequent response from SAS against this hash in an internal lookup table. In this way, the lookup table can be subsequently referenced to vastly improve performance (by avoiding unnecessary server requests).</p>
<p>The lookup event will occur immediately upon clicking on the (dynamic dropdown) cell. If the row has not changed since the previous click, the response will be instant. If any value in the row HAS changed, and that particular combination of values has not previously been requested (in the same browser session), then a request to SAS will need to take place before the dropdown values are shown.</p>
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