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    <p>To check the Username/Email Availability do the following:</p> <p>Using the <a href="https://github.com/posabsolute/jQuery-Validation-Engine" rel="nofollow">https://github.com/posabsolute/jQuery-Validation-Engine</a></p> <p>edit the validationsEngines-en.js file for the AJAX calls, one for the email will look like the following:</p> <pre><code> "ajaxEmailAvailable": { "url": "/route_to_send_the_parameters", // you may want to pass extra data on the ajax call "alertTextOk": "* This email is available", "alertText": "* This email is already taken", "alertTextLoad": "* Validating, please wait" }, </code></pre> <p>Make sure you configure your routes.rb file to match the route you want to use, the default action with the call is a GET HTTP Request.</p> <p>Next set up the proper action in your controller to handle the request (I included a helper in the Application Controller so that the input value can be sanitized before queried in the database:</p> <p>CONTROLLER HANDLING THE REQUEST</p> <pre><code> def username_availability scrubb = help.sanitize(params[:fieldValue], :tags =&gt; '') user = User.find_by_email(scrubb) if user.blank? render :json =&gt; ["INPUT_ID", true , ""] else render :json =&gt; ["INPUT_ID", false , "This email is already taken"] end end </code></pre> <p>If you are unsure of the proper INPUT ID, watch the server logs for the parameters passed during the call and do a simple copy-paste. By default the request passes the INPUT ID and INPUT VALUE.</p> <p>To gain access to this helper add the following:</p> <p>APPLICATION CONTROLLER</p> <pre><code> def help Helper.instance end class Helper include Singleton include ActionView::Helpers::TextHelper end </code></pre> <p>Now on the form itself, your input should read as the following:</p> <pre><code>&lt;%= c.text_field :email, "data-validation-engine"=&gt;"validate[required, custom[email], ajax[ajaxEmailAvailable]]" %&gt; </code></pre> <p>As per the proper functionality always place the AJAX call as the last validation.</p> <p>Don't forget to include jquery.js, jquery.validationEngine-en.js, jquery.validationEngine.js and validationEngine.jquery.css in the head of the document [in that order of js] and to call a </p> <pre><code>&lt;script type="text/javascript"&gt;$(function() {$("#FORM_ID").validationEngine();});&lt;/script&gt; </code></pre> <p>If you want to do this for username, just edit the above appropriately.</p>
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