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    <p>I think what you're asking about is actually adding custom validation to one of your form fields. If that's the case you actually need to be looking at <a href="http://docs.joomla.org/J2.5%3aDeveloping_a_MVC_Component/Adding_verifications" rel="nofollow">adding server-side validation</a> in addition to <a href="http://docs.joomla.org/J2.5%3aDeveloping_a_MVC_Component/Adding_configuration" rel="nofollow">adding configuration</a>. Pay particular attention to the 'addrulepath' in the example under the heading "Using configuration parameters as default value". You'll most likely end up extending JFormRule, of which I've included a very stripped-down example below.</p> <pre><code>&lt;?php /** headers */ defined('JPATH_PLATFORM') or die; // Joomla only class JFormRuleCustom extends JFormRule { public $type = 'Custom'; public function test(&amp;$element, $value, $group = null, &amp;$input = null, &amp;$form = null) { return /* true for passed validation, false for failed validation */ } } </code></pre> <p>When you've got that down you can add the validation "custom" to your form fields like so:</p> <pre><code>&lt;field name="pw1" type="password" label="COM_NEWUSER_UPDATE_LABEL_PASSWORD1" description="COM_NEWUSER_UPDATE_DESCRIPTION_PASSWORD1" message="COM_NEWUSER_UPDATE_ERROR_PASSWORD1" size="40" required="true" validate="custom" minlength="5" maxlength="20" specials="!@#$%^&amp;amp;*" /&gt; </code></pre> <p>Hopefully that answers your question and didn't go totally off-topic.</p>
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    1. POWhere to define a filter function for a form field in my Joomla component's preferences
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    1. USJ.T. Blum
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    1. COThanks for trying to answer my question. As far as I know, validation can not change the input value. It can only abort saving the form on invalid input and show a message. What I needed is the ability of filtering, which can change/convert the actual input to a desired form. However, I liked the way validation uses classes extended from JFormRule, but filtering does not have that implemented. In the meantime I already extended com_config and class JForm and now they use extended JFormFilter classes exactly the same way as validation does, but now for filtering, able to change the input value!
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    2. COI'm sorry I didn't quite get what you were looking for, but I'm glad it help at least.
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