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POValidate DataGridColumn cells individually
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copied!<p>How can I validate the cells in a DataGridColumn individually? (ActionScript 3.5) The validation is configured per-cell, based on fields in the given row. For example</p> <pre><code>FIELD VALUE TYPE age 13 Integer height 13x3 Integer registered true Boolean temperature 98.G6 Float </code></pre> <p>In this case, of course 13x3 and 98.G6 would be invalid. </p> <p>It's easy to write a <em>Validator</em> ; and to access the data provider objects.</p> <p>But how do I get individual access to the GUI cell objects so I can set the <em>errorString</em> on an individual cell, either directly or through a <em>Validator</em>?</p> <p>The <em>itemRenderer</em>/ <em>TextInput</em> control is re-used across the cells for performance reasons, so accessing the GUI-level objects is tricky.</p> <hr> <p>Edit</p> <p>Answers: </p> <ol> <li><p>One way to validate and display the invalidation markings, but not per-cell, is to validate all data-provider objects and then set the <em>errorString</em> on the entire grid.</p></li> <li><p>One way to validate per-cell is on the <em>itemEditEnd</em> event handler. (See these pages <a href="http://www.adobe.com/devnet/flex/articles/itemeditors_pt2.html" rel="nofollow noreferrer">A</a> <a href="http://livedocs.adobe.com/flex/3/html/help.html?content=celleditor_8.html" rel="nofollow noreferrer">B</a> <a href="http://blogs.digitalprimates.net/strictinequality/index.cfm/2008/3/3/Datagrid-item-editors-and-dynamic-behavior-part-23" rel="nofollow noreferrer">C</a> <a href="http://www.badu.ro/?p=37" rel="nofollow noreferrer">D</a>). One disadvantage is that it only allows access to the cells from the "inside", not in an action that validates the grid on command.</p></li> <li><p>A custom <em>itemRenderer</em> is another possibility, as in the answer below, but like 3 above, it only allows access to the cells from the "inside", not in an action that validates the grid on command.</p></li> <li><p>See Richard Haven's answer below.</p></li> <li><p>And here's <a href="http://www.switchonthecode.com/tutorials/accessing-datagrid-itemrenderers" rel="nofollow noreferrer">how to access the GUI objects</a>: The list of relevant GUI objects is a protected field; so you can access it by subclassing, then iterate over the GUI-components which represent the cells and set the <em>errorString</em> on each one. </p></li> </ol>

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