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POZend_Validate_Between on Another Value
 

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    <p>What is the best way to validate a number range based on the value of another form element? If the user selects "percentage" as a discount type, the discount amount should be between 0 and 100, and not 140! The problem seems to be passing in another form element value.</p> <p>Also, I've viewed other resources, one dealing with a similar topic, but perhaps not all the way relevant. <a href="https://stackoverflow.com/questions/7585232/how-to-validate-a-field-of-zend-form-based-on-the-value-of-another-field">How to validate a field of Zend_Form based on the value of another field?</a></p> <p>Form.php</p> <pre><code>$isValid = new Application_Model_Validate(); $discount = $this-&gt;createElement('text', 'discount') -&gt;setLabel('Discount Amount') -&gt;setDescription("Enter an amount in the format \"200.00\" ") -&gt;setRequired(true) -&gt;setDecorators(array('Description', 'ViewHelper', 'Errors', array('HTMLTag', array('tag' =&gt; 'dd')), array('Label', array('tag' =&gt; 'dt')))); $discount-&gt;addValidators(array(array('Float')), $isValid-&gt;isValid(new Zend_Validate_Between(array('min' =&gt; '0', 'max' =&gt; '100')), $discountType)); $this-&gt;addElement($discount); </code></pre> <p>Application_Model_Validate.php</p> <pre><code>Require_once 'Zend/Validate/Abstract.php'; class Application_Model_Validate extends Zend_Validate_Abstract { /* * Validation failure message key */ const INVALID_PERCENTAGE = 'InvalidPercentage'; /* * Validation failure message template definitions */ protected $_messageTemplates = array( self::INVALID_PERCENTAGE =&gt; 'Please enter a percentage greater than 0 and up to 100.' ); protected $_percentageOption; protected $_percentageValue; /* * Defined by Zend_Validate_Interface * Validate the percentage parameters */ public function isValid($value, $context = null) { $this-&gt;_setValue($value); /* * If context key is valid, return true */ if(is_array($context)) { if (isset($context['percentage']) &amp;&amp; ($value)) { return true; } } $this-&gt;_error(self::INVALID_PERCENTAGE); return false; } </code></pre> <p>If you need anymore information, just say. </p>
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