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POjQuery Validation: Changing Rules Dynamically
 

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    <p>I have a single form that, depending on which radio button is clicked (Login or Signup), displays either:</p> <ul> <li>email address</li> <li>password</li> </ul> <p>or:</p> <ul> <li>name</li> <li>age</li> <li>email address</li> <li>password</li> </ul> <p>Clicking on the radio button toggles the visibility of the Login/Signup fields:</p> <pre><code>&lt;form id="myForm"&gt; &lt;input name="userAction" type="radio" value="login" checked="checked"&gt;Login&lt;/input&gt; &lt;br /&gt; &lt;input name="userAction" type="radio" value="signup"&gt;Sign Up&lt;/input&gt; &lt;div id="loginFields" style="display:none"&gt; &lt;!-- Login fields (email address and password) --&gt; &lt;/div&gt; &lt;div id="signupFields" style="display:none"&gt; &lt;!-- Signup fields (name, age, email address, password) --&gt; &lt;/div&gt; &lt;/form&gt; </code></pre> <p>I'm using the <a href="http://docs.jquery.com/Plugins/validation" rel="noreferrer">jQuery Validation plug-in</a>, and I'd like to use the following rules:</p> <pre><code>var signupRules = { emailAddressTextBox: { required: true, email: true }, passwordTextBox: { required: true, minlength: 6, maxlength: 24, passwordValidationRule: true // custom regex added with $.validator.addMethod() } }; var loginRules = { nameTextBox: { required: true, maxlength: 50 }, loginEmailAddressTextBox: { required: true, email: true }, loginPasswordTextBox: { required: true, minlength: 6, maxlength: 24, passwordValidationRule: true // custom regex added with $.validator.addMethod() }, loginPasswordAgainTextBox: { required: true, minlength: 6, maxlength: 24, equalTo: "#loginPasswordTextBox" passwordValidationRule: true // custom regex added with $.validator.addMethod() } }; </code></pre> <p>How can I add the correct validation rule dynamically based on:</p> <pre><code> $("input[name='userAction']").change(function() { if ($("input[name='userAction']:checked" ).val() === "login") { // use loginRules } else { // use signupRules } }); </code></pre> <p>I've tried the following:</p> <pre><code>$("#myForm").validate({ rules: ($("input[name='userAction']:checked" ).val() === "login") ? loginRules : signupRules; }); </code></pre> <p>But since my Login fields are the default displayed, its validations work, but the Signup scenario doesn't; it wants to validate Login fields for some reason. Am I missing something?</p>
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    1. COare you replacing the elements within a form, or are you showing hidden elements within a form? I would set up the validation for two separate forms and then toggle the visibility of the two forms depending on which option is selected.
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    2. COThis is a single form where the visibility of the Login/Signup fields are toggled by the radio button.
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    3. COthe validate method can only be called once per form. Think of it as an initialization. Take a look at [this post](http://suntouchersoftware.com/2013/07/05/tips-for-using-the-jquery-validation-plugin/) for details.
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