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PO
 

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  1. PO
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    <p>I think you need to change a bit how you it works. Don't try to achieve blocking, but embrace non-blocking.</p> <p>I would do like this: - Keep the validation on email; make it Asynchronous. When it's valid, set a flag somewhere in a variable to know it's ok. - Add a callback on the form.submit() to check whether the email is ok (with the variable) and prevent the submission if it's not.</p> <p>This way you can keep asynchronous call without freeze the web browser UI.</p> <p>-- [edit] -- </p> <p>This is some quick code I just wrote for the example based on what you already have.</p> <p>For your information, a programming notion called "promises" (futures and deferred are other terms for it) has been invented to solve exactly the problem you have.</p> <p>Here's an article on what it is and how to use them in JavaScript (using dojo or jQuery): <a href="http://blogs.msdn.com/b/ie/archive/2011/09/11/asynchronous-programming-in-javascript-with-promises.aspx" rel="nofollow">http://blogs.msdn.com/b/ie/archive/2011/09/11/asynchronous-programming-in-javascript-with-promises.aspx</a> </p> <pre><code>&lt;script&gt; function validateEmailRegistered(input) { if (input.setCustomValidity === undefined) return; var err = 'Email address not found'; $.ajax({ url: 'email-is-registered.php', data: { email: input.value }, success: function(data) { var ok = data=='true'; input.setCustomValidity(ok ? '' : err); // If the form was already submited, re-launch the check if (form_submitted) { input.form.submit(); } } }); } var form_submitted = false; function submitForm(form) { // Save the user clicked on "submit" form_submitted = true; return checkForm(form); } function checkForm(form, doSubmit) { if (doSubmit) { form_submitted = true; } // If the email is not valid (it can be delayed due to asynchronous call) if (!form.email.is_valid) { return false; } return true; } &lt;/script&gt; &lt;form method="get" action="nextpage.php" onsumbit="return submitForm(this);"&gt; &lt;input name="email" id="email" type="email" required onChange="validateEmailRegistered(this)"&gt; &lt;button type="submit"&gt;go&lt;/button&gt; &lt;form&gt; </code></pre>
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    1. POHow do I do a jQuery blocking AJAX call without async = false?
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    1. USSavageman
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    1. COUsing a callback on the form submit to preventing submission is exactly what I want to achieve, but I don't see how I can do it if the callback is asynchronous...
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      1. USChrisV
 

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