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POjQuery: Submit form when AJAX finishes
 

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  1. POjQuery: Submit form when AJAX finishes
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    <p>So I have a form that on clicking submit, I want to do some validation, before it submits. Pretty straight forward I think. So I setup a submit handler on the form and wanted it to do the AJAX check, and when it finishes, if its all good, go ahead and submit as usual.</p> <p>I tried this, and it failed for very obvious reasons:</p> <pre><code>$.when(checkUsername()).done(function (a) { checkTitle(); checkMessage(); if (userValid &amp;&amp; titleValid &amp;&amp; messageValid) { return true; } }); return false; </code></pre> <p><code>checkUsername</code> is a <code>$.post</code>, while <code>checkTitle</code> and <code>checkMessage</code> are just checking if any characters are in those fields. Each of the functions relatively validates <code>userValid</code>, <code>titleValid</code>, and <code>messageValid</code>, setting those values true or false. The two input fields and text area field has a blur attached with each of the related functions, so even before the user clicks submit, the form is validating.</p> <p>So obviously, with the return false at the end, the form would never submit. BUT, I originally had the valid check outside the done (where the current return false is), and if the user entered 3 valid items, then erased a field and didn't leave it/blur, and directly clicked submit, it would still submit, because with the AJAX still processing, the fields hadn't undergone a second round of checking.</p> <p>Essentially, I want the form to wait on submission until the AJAX finishes. But the <code>submit()</code> function will process its return before the AJAX finishes, and I can't put it in a done, since I need the AJAX to trigger on on the submit. Essentially, a catch 22.</p> <p>I came up with something that I feel is a messy way of doing it, but the only method I can think of at the moment, and could use advice on if this is the only way to do it, or what other options I have. I am aware I could just submit the form via AJAX, but I'm hoping to see what options are available. This is the messy method:</p> <pre><code>if (validated) return true; else { $form = $(this); $.when(checkUsername()).done(function (a) { checkTitle(); checkMessage(); if (userValid &amp;&amp; titleValid &amp;&amp; messageValid) { validated = true; $form.submit(); } }); return false; } </code></pre> <p>In this case, there is a master validate variable only set by the ajax, and the system resubmits when done.</p>
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