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| <title>Cascading Parameters | DevExpress End-User Documentation </title> | ||
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| <h1 id="cascading-parameters">Cascading Parameters</h1> | ||
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| <p>Create cascading parameters to filter a list of predefined parameter values based on another parameter's values. The following image illustrates cascading parameters where the <strong>pProducts</strong> parameter values are filtered by the selected category:</p> | ||
| <p><img src="../../../../images/cascading-parameters-winforms.gif" alt="Dashboard for WinForms - Cascading Parameters"></p> | ||
| <p>In case of two parameters, the first parameter is used to filter the data source for the second parameter with <a href="creating-parameters.html#dynamic-list">dynamic list</a> settings.</p> | ||
| <h2 id="create-cascading-parameters">Create Cascading Parameters</h2> | ||
| <p>The dashboard in this example is connected to a Northwind database (an SQL Database) and contains three <a href="../../work-with-data/manage-sql-queries.html">queries</a>: <em>Categories</em>, <em>Products</em>, and <em>OrderReports</em>. The Grid item visualizes data from the <em>OrderReports</em> query.</p> | ||
| <p>In this tutorial, you will create two dashboard parameters:</p> | ||
| <ul> | ||
| <li>The <strong>pCategory</strong> parameter filters the <em>Products</em> query. The <em>Products</em> query is a data source for the <strong>pProducts</strong> parameter.</li> | ||
| <li>The <strong>pProducts</strong> parameter filters the <em>OrderReports</em> query.</li> | ||
| </ul> | ||
| <p>The steps below create cascading parameters in the WinForms Dashboard Designer:</p> | ||
| <ol> | ||
| <li><p>Create a dashboard parameter called <strong>pCategory</strong> with dynamic list settings. Use the <em>Categories</em> query as a data member and the <em>CategoryID</em> as a value member.</p> | ||
| <p>The parameter settings may look as follows:</p> | ||
| <p><img src="../../../../images/category-parameter-cascading.png" alt="Dashboard for WinForms - Create Dashboard Parameter"></p> | ||
| </li> | ||
| <li><p>Use the created <strong>pCategory</strong> parameter to <a href="../../work-with-data/filter-queries.html">filter</a> the <em>Products</em> query.</p> | ||
| <p>To do this, invoke the <a href="../../work-with-data/using-the-query-builder.html">Query Builder</a> and click the <strong>Filter...</strong> button to specify the filter criteria in the <strong>Filter Editor</strong>. Choose the <strong>Bind To</strong> option to automatically bind a <a href="../../work-with-data/pass-query-parameters.html">query parameter</a> to the created dashboard parameter:</p> | ||
| <p><img src="../../../../images/category-parameter-filter-cascading.png" alt="Dashboard for WinForms - Filter Query"></p> | ||
| <p>The resulting query looks as follows:</p> | ||
| <pre><code>[Products.CategoryID]=?pCategory | ||
| </code></pre> | ||
| </li> | ||
| <li><p>Create a dashboard parameter called <strong>pProducts</strong> with dynamic list settings. Use the <em>Products</em> query as a data member and the <em>ProductID</em> as a value member.</p> | ||
| <p>The parameter settings may look as follows:</p> | ||
| <p><img src="../../../../images/products-parameter-cascading.png" alt="Dashboard for WinForms - Create Dashboard Parameter"></p> | ||
| </li> | ||
| <li><p>Use the <strong>pProducts</strong> dashboard parameter to filter the <em>OrderReports</em> query.</p> | ||
| <p>To do this, invoke the <a href="../../work-with-data/using-the-query-builder.html">Query Builder</a> and click the <strong>Filter...</strong> button to specify the filter criteria in the <strong>Filter Editor</strong>. Choose the <strong>Bind To</strong> option to automatically bind a <a href="../../work-with-data/pass-query-parameters.html">query parameter</a> to the created dashboard parameter:</p> | ||
| <p><img src="../../../../images/products-parameter-filter-cascading.png" alt="Dashboard for WinForms - Filter Queries"></p> | ||
| <p>The resulting query looks as follows:</p> | ||
| <pre><code>[OrderReports.ProductID] In ?pProducts | ||
| </code></pre> | ||
| </li> | ||
| <li><p>Create a Grid item to visualize data from the filtered <em>OrderReports</em> query.</p> | ||
| </li> | ||
| </ol> | ||
| <div class="TIP"> | ||
| <h5>Tip</h5> | ||
| <p>When using a <a href="creating-parameters.html#allow-multiselect">multi-value</a> parameter to filter a query, create the condition with the <code>Is any of</code> or <code>Is none of</code> operator.</p> | ||
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