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    <p>Conditional rules/functions are only meant for:</p> <ul> <li>when the rule depends on something else. (Example: a field is only "required" when a checkbox is ticked.)</li> </ul> <p>It's <strong>not</strong> meant for:</p> <ul> <li>running a function whenever a rule is satisfied on a field.</li> </ul> <p>(<em>Yes, as you've seen, if you happen to use <code>.valid()</code> as part of a rule condition, you will cause recursion.</em>)</p> <hr> <p>The solution is to use a <code>keyup</code> event handler function along with <a href="http://jqueryvalidation.org/valid" rel="nofollow">the <code>.valid()</code> method</a> to check the status of the field.</p> <pre><code>$(document).on('pageinit', function () { // &lt;- DOM ready handler for jQuery Mobile // initialize plugin with .validate() $('#myform').validate({ // your rules &amp; options }); // fire this function on every key-up event within the password field $('input[name="password"]').on('keyup', function () { if ($(this).valid()) { // &lt;- check if password field is valid $('[name="rememberpassword"]') .checkboxradio('enable'); // &lt;- enable checkbox } else { $('[name="rememberpassword"]') .checkboxradio('disable') // &lt;- disable checkbox .attr('checked',false) // &lt;- uncheck checkbox if checked .checkboxradio('refresh'); // &lt;- refresh checkbox } }); }); </code></pre> <p><strong>Working DEMO: <a href="http://jsfiddle.net/6eEBC/" rel="nofollow">http://jsfiddle.net/6eEBC/</a></strong></p> <p>I chose not to make this part of the <code>onkeyup</code> callback function of the plugin since that would apply to every keyup event of <em>every field</em> on the form.</p> <p>I also "uncheck" the checkbox because, I suppose, you don't want it stuck on "checked" if it goes disabled again.</p> <p>According to <a href="http://jquerymobile.com/demos/1.2.1/docs/forms/checkboxes/methods.html" rel="nofollow">the jQuery Mobile docs</a>, you need to use <code>.checkboxradio('refresh')</code> when you "manipulate a checkbox via JavaScript" to update the visual styling. As per the examples on that page, it only applies when you check/uncheck the checkbox programatically.</p>
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    1. POjQuery Validation plugin, Enable a checkbox when a field is valid
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    1. COHi Sparky, thanks, i was trying to stay strictly in the limits of the Validation plugin, while your solution work, it does break the rules set by the validation plugin, on initial data entry the plugin does a lazy validation, only displaying a message once the user exit the field, once the message displayed the plugin turn into strict validation and display keystroke by keystroke the error messages. While your solution function it can be irritating to have an error message appear immediately. The only solution I can think of is to replicate the validation rules in the `keyup` section. Thanks.
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    2. COAbout the `.checkboxradio('refresh')` I found out that I do not need to use it when just enabling/disabling the checkbox.The refresh is needed when doing heavier manipulations like for example dynamically adding a checkbox.
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    3. CO@Raymond, the "refresh" was only recommended as per the jQuery Mobile documentation and examples. Just remove it if you don't think you need it. As far as "breaking rules" set forth by the jQuery Validation plugin; this solution does no such thing. However, you never described in your OP by which "events" were supposed trigger this enable/disable function. Key-up seemed most logical so that's what I used. Otherwise, what trigger would enable the checkbox? Again, my solution is equally valid by just changing the event to `blur`.
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